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Omotosho KD, Gurung V, Banerjee P, Shevchenko EV, Berman D. Self-Cleaning Highly Porous TiO 2 Coating Designed by Swelling-Assisted Sequential Infiltration Synthesis (SIS) of a Block Copolymer Template. Polymers (Basel) 2024; 16:308. [PMID: 38337197 DOI: 10.3390/polym16030308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 01/19/2024] [Accepted: 01/20/2024] [Indexed: 02/12/2024] Open
Abstract
Photocatalytic self-cleaning coatings with a high surface area are important for a wide range of applications, including optical coatings, solar panels, mirrors, etc. Here, we designed a highly porous TiO2 coating with photoinduced self-cleaning characteristics and very high hydrophilicity. This was achieved using the swelling-assisted sequential infiltration synthesis (SIS) of a block copolymer (BCP) template, which was followed by polymer removal via oxidative thermal annealing. The quartz crystal microbalance (QCM) was employed to optimize the infiltration process by estimating the mass of material infiltrated into the polymer template as a function of the number of SIS cycles. This adopted swelling-assisted SIS approach resulted in a smooth uniform TiO2 film with an interconnected network of pores. The synthesized film exhibited good crystallinity in the anatase phase. The resulting nanoporous TiO2 coatings were tested for their functional characteristics. Exposure to UV irradiation for 1 h induced an improvement in the hydrophilicity of coatings with wetting angle reducing to unmeasurable values upon contact with water droplets. Furthermore, their self-cleaning characteristics were tested by measuring the photocatalytic degradation of methylene blue (MB). The synthesized porous TiO2 nanostructures displayed promising photocatalytic activity, demonstrating the degradation of approximately 92% of MB after 180 min under ultraviolet (UV) light irradiation. Thus, the level of performance was comparable to the photoactivity of commercial anatase TiO2 nanoparticles of the same quantity. Our results highlight a new robust approach for designing hydrophilic self-cleaning coatings with controlled porosity and composition.
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Affiliation(s)
- Khalil D Omotosho
- Materials Science and Engineering Department, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Vasanta Gurung
- Materials Science and Engineering Department, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
| | - Progna Banerjee
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA
- Department of Chemistry, James Franck Institute, University of Chicago, Chicago, IL 60637, USA
| | - Diana Berman
- Materials Science and Engineering Department, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA
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Omotosho KD, Lyon Z, Shevchenko EV, Berman D. Accessibility and Mechanical Stability of Nanoporous Zinc Oxide and Aluminum Oxide Coatings Synthesized via Infiltration of Polymer Templates. Polymers (Basel) 2023; 15:4088. [PMID: 37896332 PMCID: PMC10610450 DOI: 10.3390/polym15204088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 09/27/2023] [Accepted: 10/08/2023] [Indexed: 10/29/2023] Open
Abstract
The conformal nanoporous inorganic coatings with accessible pores that are stable under applied thermal and mechanical stresses represent an important class of materials used in the design of sensors, optical coatings, and biomedical systems. Here, we synthesize porous AlOx and ZnO coatings by the sequential infiltration synthesis (SIS) of two types of polymers that enable the design of porous conformal coatings-polymers of intrinsic microporosity (PIM) and block co-polymer (BCP) templates. Using quartz crystal microbalance (QCM), we show that alumina precursors infiltrate both polymer templates four times more efficiently than zinc oxide precursors. Using the quartz crystal microbalance (QCM) technique, we provide a comprehensive study on the room temperature accessibility to water and ethanol of pores in block copolymers (BCPs) and porous polymer templates using polystyrene-block-poly-4-vinyl pyridine (PS75-b-P4VP25) and polymers of intrinsic microporosity (PIM-1), polymer templates modified by swelling, and porous inorganic coatings such as AlOx and ZnO synthesized by SIS using such templates. Importantly, we demonstrate that no structural damage occurs in inorganic nanoporous AlOx and ZnO coatings synthesized via infiltration of the polymer templates during the water freezing/melting cycling tests, suggesting excellent mechanical stability of the coatings, even though the hardness of the inorganic nanoporous coating is affected by the polymer and precursor selections. We show that the hardness of the coatings is further improved by their annealing at 900 °C for 1 h, though for all the cases except ZnO obtained using the BCP template, this annealing has a negligible effect on the porosity of the material, as is confirmed by the consistency in the optical characteristics. These findings unravel new potential for the materials being used across various environment and temperature conditions.
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Affiliation(s)
- Khalil D. Omotosho
- Materials Science and Engineering Department, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA (Z.L.)
| | - Zachary Lyon
- Materials Science and Engineering Department, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA (Z.L.)
| | - Elena V. Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA
- Department of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USA
| | - Diana Berman
- Materials Science and Engineering Department, University of North Texas, 1155 Union Circle, Denton, TX 76203, USA (Z.L.)
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Su Z, Temprano I, Folastre N, Vanpeene V, Villanova J, Gachot G, Shevchenko EV, Grey CP, Franco AA, Demortière A. Binder-Free Cnt Cathodes for Li-O 2 Batteries with More Than One Life. Small Methods 2023:e2300452. [PMID: 37817378 DOI: 10.1002/smtd.202300452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 08/28/2023] [Indexed: 10/12/2023]
Abstract
Li-O2 batteries (LOB) performance degradation ultimately occurs through the accumulation of discharge products and irreversible clogging of the porous electrode during the cycling. Electrode binder degradation in the presence of reduced oxygen species can result in additional coating of the conductive surface, exacerbating capacity fading. Herein, a facile method to fabricate free-standing is established, binder-free electrodes for LOBs in which multi-wall carbon nanotubes form cross-linked networks exhibiting high porosity, conductivity, and flexibility. These electrodes demonstrate high reproducibility upon cycling in LOBs. After cell death, efficient and inexpensive methods to wash away the accumulated discharge products are demonstrated, as reconditioning method. The second life usage of these electrodes is validated, without noticeable loss of performance. These findings aim to assist in the development of greener high energy density batteries while reducing manufacturing and recycling costs.
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Affiliation(s)
- Zeliang Su
- Laboratoire de Réactivité et Chimie des Solides (LRCS), Université de Picardie Jules Verne, CNRS UMR 7314, Hub de l'Energie, Amiens, Cedex, 80039, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459, Hub de l'Energie, Amiens, Cedex, 80039, France
| | - Israel Temprano
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Nicolas Folastre
- Laboratoire de Réactivité et Chimie des Solides (LRCS), Université de Picardie Jules Verne, CNRS UMR 7314, Hub de l'Energie, Amiens, Cedex, 80039, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459, Hub de l'Energie, Amiens, Cedex, 80039, France
| | - Victor Vanpeene
- ID16B ESRF-The European Synchrotron, CS 40220, Grenoble, Cedex 9, 38043, France
| | - Julie Villanova
- ID16B ESRF-The European Synchrotron, CS 40220, Grenoble, Cedex 9, 38043, France
| | - Gregory Gachot
- Laboratoire de Réactivité et Chimie des Solides (LRCS), Université de Picardie Jules Verne, CNRS UMR 7314, Hub de l'Energie, Amiens, Cedex, 80039, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459, Hub de l'Energie, Amiens, Cedex, 80039, France
| | - Elena V Shevchenko
- Argonne National Laboratory, Center for Nanoscale Materials, Argonne, Illinois, 60439, USA
| | - Clare P Grey
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Alejandro A Franco
- Laboratoire de Réactivité et Chimie des Solides (LRCS), Université de Picardie Jules Verne, CNRS UMR 7314, Hub de l'Energie, Amiens, Cedex, 80039, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459, Hub de l'Energie, Amiens, Cedex, 80039, France
- Institut Universitaire de France, 101 Boulevard Saint Michel, Paris, 75005, France
- ALISTORE-European Research Institute, CNRS FR 3104, Hub de l'Energie, Amiens, 80039, Cedex, France
| | - Arnaud Demortière
- Laboratoire de Réactivité et Chimie des Solides (LRCS), Université de Picardie Jules Verne, CNRS UMR 7314, Hub de l'Energie, Amiens, Cedex, 80039, France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459, Hub de l'Energie, Amiens, Cedex, 80039, France
- ALISTORE-European Research Institute, CNRS FR 3104, Hub de l'Energie, Amiens, 80039, Cedex, France
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Diroll BT, Banerjee P, Shevchenko EV. Correction: Optical anisotropy of CsPbBr 3 perovskite nanoplatelets. Nano Converg 2023; 10:43. [PMID: 37697179 PMCID: PMC10495289 DOI: 10.1186/s40580-023-00391-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Affiliation(s)
- Benjamin T Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60438, USA.
| | - Progna Banerjee
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60438, USA
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60438, USA
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Diroll BT, Banerjee P, Shevchenko EV. Optical anisotropy of CsPbBr 3 perovskite nanoplatelets. Nano Converg 2023; 10:18. [PMID: 37186268 PMCID: PMC10130288 DOI: 10.1186/s40580-023-00367-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 04/09/2023] [Indexed: 05/17/2023]
Abstract
The two-dimensional CsPbBr3 nanoplatelets have a quantum well electronic structure with a band gap tunable with sample thicknesses in discreet steps based upon the number of monolayers. The polarized optical properties of CsPbBr3 nanoplatelets are studied using fluorescence anisotropy and polarized transient absorption spectroscopies. Polarized spectroscopy shows that they have absorption and emission transitions which are strongly plane-polarized. In particular, photoluminescence excitation and transient absorption measurements reveal a band-edge polarization approaching 0.1, the limit of isotropic two-dimensional ensembles. The degree of anisotropy is found to depend on the thickness of the nanoplatelets: multiple measurements show a progressive decrease in optical anisotropy from 2 to 5 monolayer thick nanoplatelets. In turn, larger cuboidal CsPbBr3 nanocrystals, are found to have consistently positive anisotropy which may be attributed to symmetry breaking from ideal perovskite cubes. Optical measurements of anisotropy are described with respect to the theoretical framework developed to describe exciton fine structure in these materials. The observed planar absorption and emission are close to predicted values at thinner nanoplatelet sizes and follow the predicted trend in anisotropy with thickness, but with larger anisotropy than theoretical predictions. Dominant planar emission, albeit confined to the thinnest nanoplatelets, is a valuable attribute for enhanced efficiency of light-emitting devices.
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Affiliation(s)
- Benjamin T Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60438, USA.
| | - Progna Banerjee
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60438, USA
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60438, USA
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Macknojia A, Ayyagari A, Zambrano D, Rosenkranz A, Shevchenko EV, Berman D. Macroscale Superlubricity Induced by MXene/MoS 2 Nanocomposites on Rough Steel Surfaces under High Contact Stresses. ACS Nano 2023; 17:2421-2430. [PMID: 36696666 DOI: 10.1021/acsnano.2c09640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Toward the goal of achieving superlubricity, or near-zero friction, in industrially relevant material systems, solution-processed multilayer Ti3C2Tx-MoS2 blends are spray-coated onto rough 52100-grade steel surfaces as a solid lubricant. The tribological performance was assessed in a ball-on-disk configuration in a unidirectional sliding mode. The test results indicate that Ti3C2Tx-MoS2 nanocomposites led to superlubricious states, which has hitherto been unreported for both individual pristine materials, MoS2 and Ti3C2Tx, under macroscale sliding conditions, indicating a synergistic mechanism enabling the superlative performance. The processing, structure, and property correlation were studied to understand the underlying phenomena. Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy revealed the formation of an in situ robust tribolayer that was responsible for the performance at high contact pressures (>1.1 GPa) and sliding speeds (0.1 m/s). This report presents the lowest friction obtained by either MoS2 or MXene or any combination of the two so far.
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Affiliation(s)
- Ali Macknojia
- Department of Materials Science and Engineering, The University of North Texas, Denton, Texas 76203, United States
| | - Aditya Ayyagari
- Department of Materials Science and Engineering, The University of North Texas, Denton, Texas 76203, United States
| | - Dario Zambrano
- Department of Chemical Engineering, Biotechnology and Materials (FCFM), University of Chile, Santiago, 8370456, Chile
| | - Andreas Rosenkranz
- Department of Chemical Engineering, Biotechnology and Materials (FCFM), University of Chile, Santiago, 8370456, Chile
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Department of Chemistry and James Frank Institute, University of Chicago, Chicago, Illinois 60637, United States
| | - Diana Berman
- Department of Materials Science and Engineering, The University of North Texas, Denton, Texas 76203, United States
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Eliava SS, Konovalov AN, Grebenev FV, Shevchenko EV, Savinkov RS, Grebennikov DS, Zheltkova VV, Bocharov GA, Telyshev DV. [Screening of patients with cerebral aneurysms: mathematical analysis and economic justification]. Zh Vopr Neirokhir Im N N Burdenko 2023; 87:15-24. [PMID: 36763549 DOI: 10.17116/neiro20238701115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Subarachnoid hemorrhages due to rupture of cerebral aneurysms have a high risk of disability and mortality. Screening of the population to detect aneurysms in patients with risk factors is currently not carried out in Russia. However, the detection of clinically silent aneurysms and their subsequent prophylactic surgical treatment are justified, according to numerous studies. BACKGROUND Demonstrate the clinical and economic feasibility of screening the population (including first-line relatives) for cerebral aneurysms using an economic and mathematical model of the RF virtual population. MATERIAL AND METHODS Mathematical modeling was carried out using an algorithm that implements a discrete Markov chain. The virtual population consisted of 145 million people (the population of the Russian Federation). Magnetic resonance angiography 3DTOF was chosen as a screening method. Virtual patients underwent preventive surgical treatment in case of detection of aneurysm during screening. The number of aneurysms in the population, the number of aneurysmal subarachnoid hemorrhage (aSAH), the cost and outcomes of treatment, and the risk of disability were calculated. RESULTS In the case of screening and preventive surgical treatment of aneurysms, there is a decrease in the number of aSAH by 14.3% (37.5% in first-line relatives (RPLR), which affects the reduction in mortality due to aSAH by 14.4% (24.1% in The total number of disabled people is reduced by 1.5% (5.1% for the RPHR). A shift in the structure of disability towards greater labor and social adaptation of patients was noted. An economic analysis for the entire population showed that screening saves 7.7 billion annually rubles, including in the population consisting of RPLR - 4.9 billion rubles. CONCLUSION The created mathematical model of the virtual population demonstrated that screening and prophylactic treatment of cerebral aneurysms makes it possible to reduce the number of aSAH and associated mortality among the entire population and in the RPLR group. The number of individuals with severe disabilities is decreasing. Thus, population screening for the detection of cerebral aneurysms may be clinically effective and cost-effective in the general population, especially in RPCR.
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Affiliation(s)
- Sh Sh Eliava
- National Medical Research Center for Neurosurgery named after N.N. acad. N.N. Burdenko, Moscow, Russia
| | - An N Konovalov
- National Medical Research Center for Neurosurgery named after N.N. acad. N.N. Burdenko, Moscow, Russia
| | - F V Grebenev
- National Medical Research Center for Neurosurgery named after N.N. acad. N.N. Burdenko, Moscow, Russia
| | - E V Shevchenko
- National Medical Research Center for Neurosurgery named after N.N. acad. N.N. Burdenko, Moscow, Russia
| | - R S Savinkov
- Institute of Computer Science and Mathematical Modeling World-Class Research Center "Digital Biodesign and Personalized Healthcare" Sechenov First Moscow State Medical University, Moscow, Russia
- Institute of Computational Mathematics. G.I. Marchuk of the Russian Academy of Sciences, Moscow, Russia
- Moscow Center for Fundamental and Applied Mathematics at INM RAS, Moscow, Russia
| | - D S Grebennikov
- Institute of Computer Science and Mathematical Modeling World-Class Research Center "Digital Biodesign and Personalized Healthcare" Sechenov First Moscow State Medical University, Moscow, Russia
- Institute of Computational Mathematics. G.I. Marchuk of the Russian Academy of Sciences, Moscow, Russia
- Moscow Center for Fundamental and Applied Mathematics at INM RAS, Moscow, Russia
| | - V V Zheltkova
- Institute of Computer Science and Mathematical Modeling World-Class Research Center "Digital Biodesign and Personalized Healthcare" Sechenov First Moscow State Medical University, Moscow, Russia
- Institute of Computational Mathematics. G.I. Marchuk of the Russian Academy of Sciences, Moscow, Russia
- Moscow Center for Fundamental and Applied Mathematics at INM RAS, Moscow, Russia
| | - G A Bocharov
- Institute of Computer Science and Mathematical Modeling World-Class Research Center "Digital Biodesign and Personalized Healthcare" Sechenov First Moscow State Medical University, Moscow, Russia
- Institute of Computational Mathematics. G.I. Marchuk of the Russian Academy of Sciences, Moscow, Russia
- Moscow Center for Fundamental and Applied Mathematics at INM RAS, Moscow, Russia
| | - D V Telyshev
- Institute of Computer Science and Mathematical Modeling World-Class Research Center "Digital Biodesign and Personalized Healthcare" Sechenov First Moscow State Medical University, Moscow, Russia
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Ji C, Zhang Z, Omotosho KD, Berman D, Lee B, Divan R, Guha S, Shevchenko EV. Porous but Mechanically Robust All-Inorganic Antireflective Coatings Synthesized using Polymers of Intrinsic Microporosity. ACS Nano 2022; 16:14754-14764. [PMID: 36049118 DOI: 10.1021/acsnano.2c05592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Here, we introduce polymer of intrinsic microporosity 1 (PIM-1) to design single-layer and multilayered all-inorganic antireflective coatings (ARCs) with excellent mechanical properties. Using PIM-1 as a template in sequential infiltration synthesis (SIS), we can fabricate highly uniform, mechanically stable conformal coatings of AlOx with porosities of ∼50% and a refractive index of 1.41 compared to 1.76 for nonporous AlOx that is perfectly suited for substrates commonly used in high-end optical systems or touch screens (e.g., sapphire, conductive glass, bendable glass, etc.). We show that such films can be used as a single-layer ARC capable of reduction of the Fresnel reflections of sapphire to as low as 0.1% at 500 nm being deposited only on one side of the substrate. We also demonstrate that deposition of the second layer with higher porosity using block copolymers enables the design of graded-index double-layered coatings. AlOx structures with just two layers and a total thickness of less than 200 nm are capable of reduction of Fresnel reflections under normal illumination to below 0.5% in a broad spectral range with 0.1% reflection at 700 nm. Additionally, and most importantly, we show that highly porous single-layer and graded-index double-layered ARCs are characterized by high hardness and scratch resistivity. The hardness and the maximum reached load were 7.5 GPa and 13 mN with a scratch depth of about 130 nm, respectively, that is very promising for the structures consisting of two porous AlOx layers with 50% and 85% porosities, correspondingly. Such mechanical properties of coatings can also allow their application as protective layers for other optical coatings.
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Affiliation(s)
- Cheng Ji
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Zhongbo Zhang
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- The Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Khalil D Omotosho
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, Texas 76203, United States
| | - Diana Berman
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, Texas 76203, United States
| | - Byeongdu Lee
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Ralu Divan
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Supratik Guha
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Department of Chemistry and James Franck Institute, University of Chicago, Chicago, Illinois 60637, United States
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Shevchenko EV, Danilov GV, Usachev DY, Lukshin VA, Kotik KV, Ishankulov TA. [Artificial intelligence guided predicting the length of hospital-stay in a neurosurgical hospital based on the text data of electronic medical records]. Zh Vopr Neirokhir Im N N Burdenko 2022; 86:43-51. [PMID: 36534623 DOI: 10.17116/neiro20228606143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
BACKGROUND Rational use of internal resources of hospitals including bed fund turnover is important objective in high-tech medicine. Machine learning technologies can improve neurosurgical care and contribute to patient-oriented approach. OBJECTIVE To evaluate the quality of AI-guided predicting the length of hospital-stay in a neurosurgical hospital based on the text data of electronic medical records in comparison with expectations of patients and physicians. MATERIAL AND METHODS AI-guided prediction was based on analysis of unstructured text records of the electronic medical history (preoperative examination and surgical protocol). Predictive models were learned on the data of the Burdenko Neurosurgery Center accumulated for the period 2000-2017 (90.688 cases). Model testing was performed on 111 completed neurosurgical cases in a prospective study. We compared the accuracy of prediction models compared to expectations of patients and physicians regarding hospital-stay. RESULTS The median absolute error of machine prediction in the final test was 2.00 days. This value was comparable with the doctor's prediction error. CONCLUSION This study demonstrated the possibility of using unstructured textual data to predict the length of hospital-stay in a neurosurgical hospital.
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Affiliation(s)
| | - G V Danilov
- Burdenko Neurosurgical Center, Moscow, Russia
| | | | - V A Lukshin
- Burdenko Neurosurgical Center, Moscow, Russia
| | - K V Kotik
- Burdenko Neurosurgical Center, Moscow, Russia
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Shikin AM, Rybkina AA, Estyunin DA, Klimovskikh II, Rybkin AG, Filnov SO, Koroleva AV, Shevchenko EV, Likholetova MV, Voroshnin VY, Petukhov AE, Kokh KA, Tereshchenko OE, Petaccia L, Di Santo G, Kumar S, Kimura A, Skirdkov PN, Zvezdin KA, Zvezdin AK. Non-monotonic variation of the Kramers point band gap with increasing magnetic doping in BiTeI. Sci Rep 2021; 11:23332. [PMID: 34857800 PMCID: PMC8639783 DOI: 10.1038/s41598-021-02493-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 10/27/2021] [Indexed: 12/01/2022] Open
Abstract
Polar Rashba-type semiconductor BiTeI doped with magnetic elements constitutes one of the most promising platforms for the future development of spintronics and quantum computing thanks to the combination of strong spin-orbit coupling and internal ferromagnetic ordering. The latter originates from magnetic impurities and is able to open an energy gap at the Kramers point (KP gap) of the Rashba bands. In the current work using angle-resolved photoemission spectroscopy (ARPES) we show that the KP gap depends non-monotonically on the doping level in case of V-doped BiTeI. We observe that the gap increases with V concentration until it reaches 3% and then starts to mitigate. Moreover, we find that the saturation magnetisation of samples under applied magnetic field studied by superconducting quantum interference device (SQUID) magnetometer has a similar behaviour with the doping level. Theoretical analysis shows that the non-monotonic behavior can be explained by the increase of antiferromagnetic coupled atoms of magnetic impurity above a certain doping level. This leads to the reduction of the total magnetic moment in the domains and thus to the mitigation of the KP gap as observed in the experiment. These findings provide further insight in the creation of internal magnetic ordering and consequent KP gap opening in magnetically-doped Rashba-type semiconductors.
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Affiliation(s)
- A M Shikin
- Saint Petersburg State University, Saint Petersburg, 198504, Russia.
| | - A A Rybkina
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - D A Estyunin
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - I I Klimovskikh
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - A G Rybkin
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - S O Filnov
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - A V Koroleva
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - E V Shevchenko
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - M V Likholetova
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - V Yu Voroshnin
- Saint Petersburg State University, Saint Petersburg, 198504, Russia.,Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, 12489, Berlin, Germany
| | - A E Petukhov
- Saint Petersburg State University, Saint Petersburg, 198504, Russia
| | - K A Kokh
- Saint Petersburg State University, Saint Petersburg, 198504, Russia.,Kemerovo State University, Kemerovo, 650000, Russia.,Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russia
| | - O E Tereshchenko
- Saint Petersburg State University, Saint Petersburg, 198504, Russia.,Novosibirsk State University, Novosibirsk, 630090, Russia.,A. V. Rzhanov Institute of Semiconductor Physics, Novosibirsk, 630090, Russia
| | - L Petaccia
- Elettra Sincrotrone Trieste, 34149, Trieste, Italy
| | - G Di Santo
- Elettra Sincrotrone Trieste, 34149, Trieste, Italy
| | - S Kumar
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima, 739-0046, Japan
| | - A Kimura
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - P N Skirdkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, 119991, Russia.,Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia
| | - K A Zvezdin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, 119991, Russia.,Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia
| | - A K Zvezdin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, 119991, Russia.,P.N. Lebedev Physical Institute of Russian Academy of Sciences, Moscow, 119991, Russia
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11
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Pleshek D, Tran J, Li Y, Shirani A, Shevchenko EV, Berman D. Swelling-Assisted Sequential Infiltration Synthesis of Nanoporous ZnO Films with Highly Accessible Pores and Their Sensing Potential for Ethanol. ACS Appl Mater Interfaces 2021; 13:35941-35948. [PMID: 34297538 DOI: 10.1021/acsami.1c08225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Here, we report a swelling-assisted sequential infiltration synthesis (SIS) approach for the design of highly porous zinc oxide (ZnO) films by infiltration of block copolymer templates such as polystyrene-block-polyvinyl pyridine with inorganic precursors followed by UV ozone-assisted removal of the polymer template. We show that porous ZnO coatings with the thickness in the range between 140 and 420 nm can be obtained using only five cycles of SIS. The pores in ZnO fabricated via swelling-assisted SIS are highly accessible, and up to 98% of pores are available for solvent penetration. The XPS data indicate that the surface of nanoporous ZnO films is terminated with -OH groups. Density functional theory calculations show a lower energy barrier for ethanol-induced release of the oxygen restricted depletion layer in the case of the presence of -OH groups at the ZnO surface, and hence, it can lead to higher sensitivity in sensing of ethanol. We monitored the response of ZnO porous coatings with different thicknesses and porosities to ethanol vapors using combined mass-based and chemiresistive approaches at room temperature and 90 °C. The porous ZnO conformal coatings reveal a promising sensitivity toward detection of ethanol at low temperatures. Our results suggest the excellent potential of the SIS approach for the design of conformal ZnO coatings with controlled porosity, thickness, and composition that can be adapted for sensing applications.
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Affiliation(s)
- Daniel Pleshek
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, Texas 76203, United States
| | - John Tran
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, Texas 76203, United States
| | - Yuzhe Li
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, Texas 76203, United States
| | - Asghar Shirani
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, Texas 76203, United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Ave, Lemont, Illinois 60439, United States
- Department of Chemistry and James Frank Institute, University of Chicago, Chicago, Illinois 60637 United States
| | - Diana Berman
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, Texas 76203, United States
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12
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Ramazanov GR, Kovaleva EA, Shevchenko EV, Akhmatkhanova LKB. [The use of amantadine sulfate in ischemic stroke]. Zh Nevrol Psikhiatr Im S S Korsakova 2021; 120:56-59. [PMID: 33449534 DOI: 10.17116/jnevro202012012256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To assess the efficacy and safety of amantadine sulfate in patients with ischemic stroke. MATERIAL AND METHODS Ninety five patients with ischemic stroke were randomized within 120 hours from the onset of symptoms into two groups: patients of the main group received amantadine sulfate (400 mg/day intravenously) for 4 days, followed by oral administration at 400 mg/day for 6 days; the comparison group received standard therapy according to the order of the Ministry of Health of the Russian Federation No. 928n. The observation period for the patients was 90 days. The main indicators of treatment efficacy were: Glasgow Coma Scale (GCS), Modified Rankin Scale (mRS), Bartel Index (BI), National Institutes of Health Stroke Scale (NIHSS), and mortality. Any side effects were recorded to assess safety. RESULTS AND CONCLUSION There were no statistically significant differences between the main group and the comparison group for the main parameters. However, we observed better results in patients with mild stroke (NIHSS <13 points) and atherothrombotic pathogenetic variant of ischemic stroke. This observation should be confirmed in subsequent clinical studies.
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Affiliation(s)
- G R Ramazanov
- Sklifosovsky Research Institute for Emergency Medicine, Moscow, Russia
| | - E A Kovaleva
- Sklifosovsky Research Institute for Emergency Medicine, Moscow, Russia
| | - E V Shevchenko
- Sklifosovsky Research Institute for Emergency Medicine, Moscow, Russia
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13
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Vlasko-Vlasov VK, Sulwer M, Shevchenko EV, Parker J, Kwok WK. Ring patterns generated by an expanding colloidal meniscus. Phys Rev E 2020; 102:052608. [PMID: 33327138 DOI: 10.1103/physreve.102.052608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 11/06/2020] [Indexed: 11/07/2022]
Abstract
The drop-and-dry is a common technique allowing for creation of periodic nanoparticle (NP) structures for sensing, photonics, catalysis, etc. However, the reproducibility and scalability of this approach for fabrication of NP-based structures faces serious challenges due to the complexity of the simple, at first glance, evaporation process. In this work we study the effect of the spatial confinement on the NP self-assembly under slow solvent evaporation, when the air-liquid-substrate contact line (CL) expands from the center towards the walls of a cylindrical cell, forming a toroid. Using in situ video monitoring of the stick-slip CL motion, we find regular hydrodynamic perturbations in the meniscus, and reveal fine details of the formation of quasiperiodic rings of close packed NP layers. We report that drying of the toroidal NP droplet has a number of important differences from drying of the classical hemispherical colloidal drops. In toroidal drops we observe linear-in-time average meniscus motion, in contrast to the hemispherical drops where the meniscus moves as a square root of time. While both droplet geometries produce NP ring patterns, the ring width for the toroidal drop decreases with increasing ring radius, while it decreases with decreasing the radius of the hemispherical drop. We suggest that free ligands are the main cause of the Marangoni instabilities driving the periodic vorticity in the meniscus. In addition, we show that the usually ignored contact line tension may yield a considerable contribution to the CL pinning causing the CL slip-stick motion and the ring formation.
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Affiliation(s)
- V K Vlasko-Vlasov
- Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Sulwer
- Department of Physics, Lewis University, Romeoville, Illinois 60446, USA
| | - E V Shevchenko
- Argonne National Laboratory, Center for Nanoscale Materials, Argonne, Illinois 60439, USA
| | - J Parker
- Department of Physics, Lewis University, Romeoville, Illinois 60446, USA
| | - W K Kwok
- Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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14
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Shevchenko EV, Podsiadlo P, Wu X, Lee B, Rajh T, Morin R, Pelton M. Visualizing Heterogeneity of Monodisperse CdSe Nanocrystals by Their Assembly into Three-Dimensional Supercrystals. ACS Nano 2020; 14:14989-14998. [PMID: 33073574 DOI: 10.1021/acsnano.0c04864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We show that the self-assembly of monodisperse CdSe nanocrystals synthesized at lower temperature (∼310 °C) into three-dimensional supercrystals results in the formation of separate regions within the supercrystals that display photoluminescence at two distinctly different wavelengths. Specifically, the central portions of the supercrystals display photoluminescence and absorption in the orange region of the spectrum, around 585 nm, compared to the 575 nm photoluminescence maximum for the nanocrystals dispersed in toluene. Distinct domains on the surfaces and edges of the supercrystals, by contrast, display photoluminescence and absorption in the green region of the spectrum, around 570 nm. We attribute the different-colored domains to two subpopulations of NCs in the monodisperse ensemble: the nanocrystals in the "orange" regions are chemically stable, whereas the nanocrystals in the "green" regions are partially oxidized. The susceptibility of the "green" nanocrystals to oxidation indicates a lower coverage of capping molecules on these nanocrystals. We propose that the two subpopulations correspond to nanocrystals with different surfaces that we attribute to the polytypism of CdSe.
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Affiliation(s)
- Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Paul Podsiadlo
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
- ExxonMobil Research and Engineering Company, Fuels, Process & Optimization Technology Process Engineering Division, 22777 Springwoods Village, Parkway Spring, Texas 77389, United States
| | - Xiaohua Wu
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
- Mindray, Mindray Building, Hitech Industrial Park, Nanshan District, Shenzhen 518057, China
| | - Byeongdu Lee
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Tijana Rajh
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Rachel Morin
- Department of Physics, UMBC (University of Maryland, Baltimore County), 1000 Hilltop Circle, Baltimore, Maryland 20912, United States
| | - Matthew Pelton
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
- Department of Physics, UMBC (University of Maryland, Baltimore County), 1000 Hilltop Circle, Baltimore, Maryland 20912, United States
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15
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Usachev DY, Lukshin VA, Yakovlev SB, Shmigelsky AV, Pronin IN, Arustamyan SR, Belousova OB, Akhmedov AD, Shulgina AA, Sosnin AD, Shevchenko EV, Kulikov AS. [A 20-year experience in surgical treatment of steno-occlusive lesion of craniocervical arteries at the Burdenko Neurosurgical Center]. Zh Vopr Neirokhir Im N N Burdenko 2020; 84:6-20. [PMID: 32649809 DOI: 10.17116/neiro2020840316] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
INTRODUCTION Surgical treatment of cerebral ischemia at the Burdenko Neurosurgical Center for the period from 1999 to 2019 is analyzed in the paper. The details of the treatment strategy in patients with steno-occlusive lesion of craniocervical arteries followed by cerebral ischemia developed over 20 years are discussed in the article. We have analyzed the features of surgical interventions on the major craniocervical arteries in a neurosurgical clinic and the results of this treatment. OBJECTIVE To demonstrate management of various lesions of major cerebral arteries in modern neurosurgical vascular hospital. MATERIAL AND METHODS In total, there were 3098 interventions on the major cerebral arteries in 2527 patients for this period. Mean age of patients ranged from 1.5 to 91 years (58±14 years). Interventions included open reconstructions of the carotid arteries (2031 surgeries), reconstructions of the vertebrobasilar arteries (135 surgeries), brain revascularization (658 surgeries), excision of the tumors of neurovascular bundle on the neck compressing carotid arteries (51 interventions). Endovascular interventions were performed in 223 cases and consisted of angioplasty and stenting of the extracranial segments of craniocervical arteries (185 surgeries), stenting of the intracranial arteries (30 surgeries) and endovascular thrombextraction (8 cases). Staged surgeries were performed in 541 patients (22.3%). RESULTS Favorable outcomes were obtained in 87.6% of cases, satisfactory results - in 9% of patients. Clinical deterioration due to long-term postoperative complications and recurrent strokes occurred in 2.9% of cases. Postoperative morbidity rate was 4.6%, persistent neurological deficit developed in 2.6% of cases. Mortality rate was 0.5%. CONCLUSION Surgical treatment of stenotic and occlusive lesion of the major cerebral arteries is an interdisciplinary problem. Solution of this issue is closely associated with technological progress, new discoveries in normal and pathological physiology, as well as clinical researches. Individualized choice of surgical approach is one the main modern trends of neurosurgical approach to this problem. At the same time, own surgical experience is the most important factor determining the results of arterial reconstructions.
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Affiliation(s)
| | - V A Lukshin
- Burdenko Neurosurgical Center, Moscow, Russia
| | | | | | - I N Pronin
- Burdenko Neurosurgical Center, Moscow, Russia
| | | | | | | | | | - A D Sosnin
- Burdenko Neurosurgical Center, Moscow, Russia
| | | | - A S Kulikov
- Burdenko Neurosurgical Center, Moscow, Russia
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16
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Rozhkova EA, Lee B, Prasad JA, Liu Y, Shevchenko EV. Hypoxia-induced biosynthesis of gold nanoparticles in the living brain. Nanoscale 2019; 11:19285-19290. [PMID: 31539009 DOI: 10.1039/c9nr05794c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
While a large number of studies deal with biomedical applications of various types of nanoparticles synthesized using wet chemistry, we propose the concept of targeted biosynthesis of nanoparticles in the living brain. Here we demonstrate that the pathological biochemical process of accumulation of reduced pyridine nucleotides under deleterious conditions of brain hypoxia can be redirected to drive the biosynthesis of biocompatible Au nanoparticles from a precursor salt in situ in the immediate vicinity of the hypoxia site, thereby restoring the redox status of the brain.
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Affiliation(s)
- Elena A Rozhkova
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA.
| | - Byeongdu Lee
- X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA
| | - Judy A Prasad
- Department of Neurobiology, the University of Chicago, 947 E. 58th St., Chicago, IL 60637, USA
| | - Yuzi Liu
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA.
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA.
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17
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Lukshin VA, Usachev DY, Shulgina AA, Shevchenko EV. [Local cerebral hemodynamics following STA-MCA bypass in patients with symptomatic carotid occlusions]. Zh Vopr Neirokhir Im N N Burdenko 2019; 83:29-41. [PMID: 31339495 DOI: 10.17116/neiro20198303129] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE To assess changes in local hemodynamic parameters in patients with symptomatic ICA occlusions and moyamoya disease after placement of extracranial-intracranial bypass (EC-IC bypass). MATERIAL AND METHODS The study included 112 patients who underwent surgical treatment at the National Scientific and Practical Center for Neurosurgery in the period between 1999 and 2015. Of these, 105 patients had ICA occlusions, and 7 patients had moyamoya disease. During the main stage of EC-IC bypass placement, all patients were monitored for local hemodynamic parameters using intraoperative contact Doppler ultrasonography - 89 (72%) patients (72%) and flowmetry - 56 (50%)). In 33 (29%) cases, both techniques were used. Forty two patients underwent preoperative SCT perfusion to assess the degree of perfusion deficit. Grade 1 cerebrovascular insufficiency (acute oligemia) was detected in 6 patients; grade 2 perfusion deficit (persistent oligemia) was found in 25 patients; grade 3 perfusion deficit (chronic oligemia) was present in 11 patients. Measurements were performed before bypass placement: the blood flow direction and hemodynamic parameters in the cortical arteries were evaluated; and after bypass placement: blood flow values and directions in the cortical artery, proximal and distal to the bypass area, were assessed. RESULTS A total of 112 EC-IC bypasses were placed without perioperative complications and deaths. Bypass functioning was confirmed in 108 (96.3%) cases; bypass thrombosis occurred in 4 (3.7%) cases. The distal blood flow direction was observed in patients with ICA occlusions (105 patients) in all cases before EC-IC bypass placement. Patients with moyamoya disease had more often the proximal blood flow direction - 5 (71%) out of 7 cases. The cerebral blood flow parameters obtained in this study differed significantly, depending on the baseline degree of perfusion deficit. The blood flow rate was minimal in patients with grade 1 cerebrovascular insufficiency. After revascularization, local hemodynamics in the cortical arteries was significantly dependent on the ability of EC-IC bypass to reverse blood flow in the proximal acceptor artery. A change in the blood flow direction was observed in 86 (77%) cases. The mean volumetric blood flow in EC-IC bypass was 34.2±5.7 mL/min. CONCLUSION The knowledge of baseline hemodynamic parameters and their changes after revascularization plays an important role in choosing the correct surgical technique, further bypass functioning, and, as a result, improvement of the clinical outcome after surgery.
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Affiliation(s)
- V A Lukshin
- Burdenko National Scientific and Practical Center for Neurosurgery, Moscow, Russia
| | - D Yu Usachev
- Burdenko National Scientific and Practical Center for Neurosurgery, Moscow, Russia
| | - A A Shulgina
- Burdenko National Scientific and Practical Center for Neurosurgery, Moscow, Russia
| | - E V Shevchenko
- Burdenko National Scientific and Practical Center for Neurosurgery, Moscow, Russia
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18
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Lee B, Littrell K, Sha Y, Shevchenko EV. Revealing the Effects of the Non-solvent on the Ligand Shell of Nanoparticles and Their Crystallization. J Am Chem Soc 2019; 141:16651-16662. [DOI: 10.1021/jacs.9b06010] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Byeongdu Lee
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Kenneth Littrell
- Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yuchen Sha
- Institute of Advanced Studies, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, P. R. China
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Elena V. Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
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19
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She Y, Goodman ED, Lee J, Diroll BT, Cargnello M, Shevchenko EV, Berman D. Block-Co-polymer-Assisted Synthesis of All Inorganic Highly Porous Heterostructures with Highly Accessible Thermally Stable Functional Centers. ACS Appl Mater Interfaces 2019; 11:30154-30162. [PMID: 31353888 DOI: 10.1021/acsami.9b09991] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Here, we propose a simple approach for the design of highly porous multicomponent heterostructures by infiltration of block-co-polymer templates with inorganic precursors in swelling solvents followed by gas-phase sequential infiltration synthesis and thermal annealing. This approach can prepare conformal coatings, free-standing membranes, and powders consisting of uniformly sized metal or metal oxide nanoparticles (NPs) well dispersed in a porous oxide matrix. We employed this new, versatile synthetic concept to synthesize catalytically active heterostructures of uniformly dispersed ∼4.3 nm PdO nanoparticles accessible through three-dimensional pore networks of the alumina support. Importantly, such materials reveal high resistance against sintering at 800 °C, even at relatively high loadings of NPs (∼10 wt %). At the same time, such heterostructures enable high mass transport due to highly interconnected nature of the pores. The surface of synthesized nanoparticles in the porous matrix is highly accessible, which enables their good catalytic performance in methane and carbon monoxide oxidation. In addition, we demonstrate that this approach can be utilized to synthesize heterostructures consisting of different types of NPs on a highly porous support. Our results show that swelling-based infiltration provides a promising route toward the robust and scalable synthesis of multicomponent structures.
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Affiliation(s)
- Yunlong She
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute , University of North Texas , 1155 Union Circle , Denton , Texas 76203 , United States
| | - Emmett D Goodman
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis , Stanford University , Stanford , California 94305 , United States
| | - Jihyung Lee
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute , University of North Texas , 1155 Union Circle , Denton , Texas 76203 , United States
| | - Benjamin T Diroll
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 S. Cass Avenue , Argonne , Illinois 60439 , United States
| | - Matteo Cargnello
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis , Stanford University , Stanford , California 94305 , United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 S. Cass Avenue , Argonne , Illinois 60439 , United States
| | - Diana Berman
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute , University of North Texas , 1155 Union Circle , Denton , Texas 76203 , United States
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20
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Patra TK, Chan H, Podsiadlo P, Shevchenko EV, Sankaranarayanan SKRS, Narayanan B. Ligand dynamics control structure, elasticity, and high-pressure behavior of nanoparticle superlattices. Nanoscale 2019; 11:10655-10666. [PMID: 30839029 DOI: 10.1039/c8nr09699f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Precise engineering of nanoparticle superlattices (NPSLs) for energy applications requires a molecular-level understanding of the physical factors governing their morphology, periodicity, mechanics, and response to external stimuli. Such knowledge, particularly the impact of ligand dynamics on physical behavior of NPSLs, is still in its infancy. Here, we combine coarse-grained molecular dynamics simulations, and small angle X-ray scattering experiments in a diamond anvil cell to demonstrate that coverage density of capping ligands (i.e., number of ligands per unit area of a nanoparticle's surface), strongly influences the structure, elasticity, and high-pressure behavior of NPSLs using face-centered cubic PbS-NPSLs as a representative example. We demonstrate that ligand coverage density dictates (a) the extent of diffusion of ligands over NP surfaces, (b) spatial distribution of the ligands in the interstitial spaces between neighboring NPs, and (c) the fraction of ligands that interdigitate across different nanoparticles. We find that below a critical coverage density (1.8 nm-2 for 7 nm PbS NPs capped with oleic acid), NPSLs collapse to form disordered aggregates via sintering, even under ambient conditions. Above the threshold ligand coverage density, NPSLs surprisingly preserve their crystalline order even under high applied pressures (∼40-55 GPa), and show a completely reversible pressure behavior. This opens the possibility of reversibly manipulating lattice spacing of NPSLs, and in turn, finely tuning their collective electronic, optical, thermo-mechanical, and magnetic properties.
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Affiliation(s)
- Tarak K Patra
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA.
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21
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She Y, Lee J, Lee B, Diroll B, Scharf T, Shevchenko EV, Berman D. Effect of the Micelle Opening in Self-assembled Amphiphilic Block Co-polymer Films on the Infiltration of Inorganic Precursors. Langmuir 2019; 35:796-803. [PMID: 30614710 DOI: 10.1021/acs.langmuir.8b04039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Infiltration of the polymer templates with inorganic precursors using the selective vapor-phase infiltration approach, or sequential infiltration synthesis (SIS), allows the design of materials with advanced properties. Swelling of the block co-polymer (BCP) templates enables the additional control of the structure, porosity, and thickness of the composite or inorganic materials. Here, we use the highly precise quartz crystal microbalance (QCM) technique to investigate quantitatively the effect of the micelle opening by swelling and inorganic precursor infiltrating on the evolution of porosity in amphiphilic BCPs. We show that swelling of the polystyrene- block-poly-4-vinyl pyridine (PS- b-P4VP) BCP in ethanol at 75 °C occurs rapidly and results in a stable polymer structure in 30 min. By using an alumina model system, we found that swelling enables access to all available polar domains of the PS- b-P4VP film leading to an increase in the SIS-infiltrated alumina mass as compared to the nonswelled BCP layer. Our results demonstrate that swelling of the 110 nm thick BCP template results in the formation of 192 nm thick alumina films with 2 times larger alumina mass and 4 times larger effective pore volume than in case of the nonswelled sample. In the case of the thicker polymer template, the difference due to swelling becomes even more substantial because the fraction of accessible polymer is increased much more than in thin films. Our findings provide important insights into the mechanism of the infiltration of the inorganic precursors into swelled and nonswelled, spin-coated BCP templates enabling the design of highly porous thick ceramic films by SIS.
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Affiliation(s)
- Yunlong She
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute , University of North Texas , 1155 Union Circle , Denton , Texas 76203 , United States
| | - Jihyung Lee
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute , University of North Texas , 1155 Union Circle , Denton , Texas 76203 , United States
| | | | | | - Thomas Scharf
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute , University of North Texas , 1155 Union Circle , Denton , Texas 76203 , United States
| | | | - Diana Berman
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute , University of North Texas , 1155 Union Circle , Denton , Texas 76203 , United States
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22
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She Y, Lee J, Diroll BT, Scharf TW, Shevchenko EV, Berman D. Accessibility of the pores in highly porous alumina films synthesized via sequential infiltration synthesis. Nanotechnology 2018; 29:495703. [PMID: 30211698 DOI: 10.1088/1361-6528/aae144] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Inorganic nanoporous materials with highly accessible pores are of great interest for the design of efficient catalytic, purification and detection systems. Limited access to the pores is a common problem associated with traditional approaches for the synthesis of porous materials, affecting the functionality of the low-density structure. Recently, infiltration of a nanoporous polymer template with inorganic precursors followed by oxidative annealing was proposed as a new and efficient approach to creating porous inorganic structures with controlled thickness, composition and pore sizes. Here, we report an ultra-high accessibility of the pores in porous films prepared via polymer-swelling-assisted sequential infiltration synthesis (SIS). Using a quartz crystal microbalance technique, we show the increased solvent adsorbing capabilities of highly porous alumina films as a result of high interconnectivity of the pores in such structures. The directionality and highly interconnected nature of the pores are demonstrated in experiments with the partial blocking of pore access by the deposition of a single-layer graphene that is not transparent to solvent. 60% of the pores remain accessible when only 20% of the surface is exposed to solvent. Using humidity detection as an example, we also show that highly porous alumina produced by polymer-swelling-assisted SIS is a promising candidate for sensing applications.
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Affiliation(s)
- Yunlong She
- Materials Science and Engineering Department and Advanced Materials and Manufacturing Processes Institute, University of North Texas, 1155 Union Circle, Denton, TX 76203, United States of America
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Peng P, Lin XM, Liu Y, Filatov AS, Li D, Stamenkovic VR, Yang D, Prakapenka VB, Lei A, Shevchenko EV. Binary Transition-Metal Oxide Hollow Nanoparticles for Oxygen Evolution Reaction. ACS Appl Mater Interfaces 2018; 10:24715-24724. [PMID: 29953206 DOI: 10.1021/acsami.8b06165] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Low-cost transition metal oxides are actively explored as alternative materials to precious metal-based electrocatalysts for the challenging multistep oxygen evolution reaction (OER). We utilized the Kirkendall effect allowing the formation of hollow polycrystalline, highly disordered nanoparticles (NPs) to synthesize highly active binary metal oxide OER electrocatalysts in alkali media. Two synthetic strategies were applied to achieve compositional control in binary transition metal oxide hollow NPs. The first strategy is capitalized on the oxidation of transition-metal NP seeds in the presence of other transition-metal cations. Oxidation of Fe NPs treated with Ni (+2) cations allowed the synthesis of hollow oxide NPs with a 1-4.7 Ni-to-Fe ratio via an oxidation-induced doping mechanism. Hollow Fe-Ni oxide NPs also reached a current density of 10 mA/cm2 at 0.30 V overpotential. The second strategy is based on the direct oxidation of iron-cobalt alloy NPs which allows the synthesis of hollow Fe xCo100- x-oxide NPs where x can be tuned in the range between 36 and 100. Hollow Fe36Co64-oxide NPs also revealed the current density of 10 mA/cm2 at 0.30 V overpotential in 0.1 M KOH.
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Affiliation(s)
- Pan Peng
- Institute of Advanced Studies (IAS), College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , Hubei , P. R. China
| | | | | | | | | | | | - Dali Yang
- Institute of Advanced Studies (IAS), College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , Hubei , P. R. China
| | | | - Aiwen Lei
- Institute of Advanced Studies (IAS), College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , Hubei , P. R. China
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24
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Demortière A, Leonard DN, Petkov V, Chapman K, Chattopadhyay S, She C, Cullen DA, Shibata T, Pelton M, Shevchenko EV. Strain-Driven Stacking Faults in CdSe/CdS Core/Shell Nanorods. J Phys Chem Lett 2018; 9:1900-1906. [PMID: 29589949 DOI: 10.1021/acs.jpclett.8b00914] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Colloidal semiconductor nanocrystals are commonly grown with a shell of a second semiconductor material to obtain desired physical properties, such as increased photoluminescence quantum yield. However, the growth of a lattice-mismatched shell results in strain within the nanocrystal, and this strain has the potential to produce crystalline defects. Here, we study CdSe/CdS core/shell nanorods as a model system to investigate the influence of core size and shape on the formation of stacking faults in the nanocrystal. Using a combination of high-angle annular dark-field scanning transmission electron microscopy and pair-distribution-function analysis of synchrotron X-ray scattering, we show that growth of the CdS shell on smaller, spherical CdSe cores results in relatively small strain and few stacking faults. By contrast, growth of the shell on larger, prolate spheroidal cores leads to significant strain in the CdS lattice, resulting in a high density of stacking faults.
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Affiliation(s)
- Arnaud Demortière
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
- Laboratoire de Réactivité et Chimie des Solides (LRCS), CNRS UMR 7314 , Université Picardie Jules Verne , 80039 Amiens , France
- Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR 3459 , 80039 Amiens , France
| | - Donovan N Leonard
- Materials Science and Technology Division , Oak Ridge National Laboratory , 1 Bethel Valley Road , Oak Ridge , Tennessee 37831-6071 , United States
| | - Valeri Petkov
- Department of Physics , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - Karena Chapman
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - Soma Chattopadhyay
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - Chunxing She
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - David A Cullen
- Materials Science and Technology Division , Oak Ridge National Laboratory , 1 Bethel Valley Road , Oak Ridge , Tennessee 37831-6071 , United States
| | - Tomohiro Shibata
- Advanced Photon Source , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
| | - Matthew Pelton
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
- Department of Physics , University of Maryland, Baltimore County (UMBC) , Baltimore , Maryland 21250 , United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Argonne , Illinois 60439 , United States
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25
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Mizrahi MD, Krylova G, Giovanetti LJ, Ramallo-López JM, Liu Y, Shevchenko EV, Requejo FG. Unexpected compositional and structural modification of CoPt 3 nanoparticles by extensive surface purification. Nanoscale 2018; 10:6382-6392. [PMID: 29561055 DOI: 10.1039/c8nr00060c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We combined synchrotron small angle X-ray scattering, X-ray fluorescence and extended X-ray absorption fine structure spectroscopy to probe the structure of chemically synthesized CoPt3 nanoparticles (NPs) after ligand removal via the commonly accepted solvent/nonsolvent approach. We showed that the improved catalytic activity of extensively purified NPs could not be explained only in terms of a "cleaner" surface. We found that extensive surface purification results in the substantial leaching of the Co atoms from the chemically synthesized CoPt3 NPs transforming them into CoPt3/Pt core/shell structures with an unexpectedly thick (∼0.5 nm) Pt shell. We indicated that the improved catalytic activity of extensively purified NPs in octyne hydrogenation reaction can be explained by the formation of CoPt3/Pt core/shell structures. Also, we demonstrated that drastic compositional and structural transformation of water transferred CoPt3 NPs was rather a result of extensive removal of native ligands via a solvent/nonsolvent approach than leaching of cobalt atoms in aqueous media. We expect that these findings can be relevant to other transition metal based multicomponent NPs.
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Affiliation(s)
- Martín D Mizrahi
- INIFTA, CONICET and Dpto. Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, P.O. Box 16, Suc. 4, 1900 La Plata, Buenos Aires, Argentina.
| | - Galyna Krylova
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA.
| | - Lisandro J Giovanetti
- INIFTA, CONICET and Dpto. Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, P.O. Box 16, Suc. 4, 1900 La Plata, Buenos Aires, Argentina.
| | - José M Ramallo-López
- INIFTA, CONICET and Dpto. Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, P.O. Box 16, Suc. 4, 1900 La Plata, Buenos Aires, Argentina.
| | - Yuzi Liu
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA.
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA.
| | - Félix G Requejo
- INIFTA, CONICET and Dpto. Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, P.O. Box 16, Suc. 4, 1900 La Plata, Buenos Aires, Argentina.
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26
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She Y, Lee J, Diroll BT, Lee B, Aouadi S, Shevchenko EV, Berman D. Rapid Synthesis of Nanoporous Conformal Coatings via Plasma-Enhanced Sequential Infiltration of a Polymer Template. ACS Omega 2017; 2:7812-7819. [PMID: 31457338 PMCID: PMC6645430 DOI: 10.1021/acsomega.7b01314] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 11/01/2017] [Indexed: 05/31/2023]
Abstract
Nanoporous conformal coating is an important class of materials for electrocatalysis, water purification, antireflective coatings, etc. Common synthesis methods of porous films often require harsh conditions (high temperature and high plasma power) or specific substrate materials. Here, we report a plasma-enhanced sequential infiltration synthesis (PE SIS) as a new platform toward deposition of nanoporous inorganic films. PE SIS is based on oxygen-plasma-induced rapid conversion of metal precursors selectively adsorbed in a block-copolymer template. Porosity and thickness of resulting materials can be easily controlled by characteristics of the template. PE SIS is conducted under gentle conditions, and can be applied to a broad range of substrates, including water-sensitive surfaces. PE SIS offers adventurous rapid infiltration with improved ability to obtain highly interconnected porous alumina films with thicknesses up to 5 μm. We show that full infiltration of the polar domain of the polymer template can be achieved upon initial exposure to TMA, followed by its oxygen-plasma-induced conversion into a functional material. Since different types of plasma (such as oxygen, nitrogen, hydrogen, etc.) induce conversion of a broad range of metal precursors, PE SIS opens a new approach for synthesis of highly porous materials with various elemental compositions and stoichiometries.
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Affiliation(s)
- Yunlong She
- Materials
Science and Engineering Department, University
of North Texas, 1155 Union Circle, Denton, Texas 76203, United
States
| | - Jihyung Lee
- Materials
Science and Engineering Department, University
of North Texas, 1155 Union Circle, Denton, Texas 76203, United
States
| | - Benjamin T. Diroll
- Center for Nanoscale Materials and Advanced Photon
Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United
States
| | - Byeongdu Lee
- Center for Nanoscale Materials and Advanced Photon
Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United
States
| | - Samir Aouadi
- Materials
Science and Engineering Department, University
of North Texas, 1155 Union Circle, Denton, Texas 76203, United
States
| | - Elena V. Shevchenko
- Center for Nanoscale Materials and Advanced Photon
Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United
States
| | - Diana Berman
- Materials
Science and Engineering Department, University
of North Texas, 1155 Union Circle, Denton, Texas 76203, United
States
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Usachev DY, Lukshin VA, Shevchenko EV, Shmigel'skiy AV, Sosnin AD, Akhmedov AD. [Simultaneous reconstruction of the carotid and vertebral arteries using a temporary intraluminal shunt (a clinical case)]. Zh Vopr Neirokhir Im N N Burdenko 2017; 81:76-83. [PMID: 29076471 DOI: 10.17116/neiro201781576-83] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The article describes a case of one-stage surgical treatment of a patient with progressive chronic cerebral ischemia caused by combined steno-occlusive lesions of the carotid and vertebral arteries. The disease was complicated by intolerance to temporary occlusion of the carotid artery due to an incomplete circle of Willis. We performed extra-anatomic carotid-vertebral artery bypass with subsequent ipsilateral carotid endarterectomy. A temporary intraluminal shunt was used at the main stage of reconstructive surgery. We use this clinical case to analyze the issues of surgical treatment for combined lesions of the carotid and vertebral arteries and the techniques for prevention of associated ischemic complications.
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Affiliation(s)
- D Yu Usachev
- Burdenko Neurosurgical Institute, Moscow, Russia
| | - V A Lukshin
- Burdenko Neurosurgical Institute, Moscow, Russia
| | | | | | - A D Sosnin
- Burdenko Neurosurgical Institute, Moscow, Russia
| | - A D Akhmedov
- Burdenko Neurosurgical Institute, Moscow, Russia
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Berman D, Guha S, Lee B, Elam JW, Darling SB, Shevchenko EV. Sequential Infiltration Synthesis for the Design of Low Refractive Index Surface Coatings with Controllable Thickness. ACS Nano 2017; 11:2521-2530. [PMID: 28139905 DOI: 10.1021/acsnano.6b08361] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Control over refractive index and thickness of surface coatings is central to the design of low refraction films used in applications ranging from optical computing to antireflective coatings. Here, we introduce gas-phase sequential infiltration synthesis (SIS) as a robust, powerful, and efficient approach to deposit conformal coatings with very low refractive indices. We demonstrate that the refractive indices of inorganic coatings can be efficiently tuned by the number of cycles used in the SIS process, composition, and selective swelling of the of the polymer template. We show that the refractive index of Al2O3 can be lowered from 1.76 down to 1.1 using this method. The thickness of the Al2O3 coating can be efficiently controlled by the swelling of the block copolymer template in ethanol at elevated temperature, thereby enabling deposition of both single-layer and graded-index broadband antireflective coatings. Using this technique, Fresnel reflections of glass can be reduced to as low as 0.1% under normal illumination over a broad spectral range.
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Affiliation(s)
- Diana Berman
- Materials Science and Engineering Department, University of North Texas , Denton, Texas 76203 United States
| | - Supratik Guha
- Institute for Molecular Engineering, University of Chicago , Chicago, Illinois 60637 United States
| | | | | | - Seth B Darling
- Institute for Molecular Engineering, University of Chicago , Chicago, Illinois 60637 United States
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30
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Yoon SJ, Guo Z, Dos Santos Claro PC, Shevchenko EV, Huang L. Direct Imaging of Long-Range Exciton Transport in Quantum Dot Superlattices by Ultrafast Microscopy. ACS Nano 2016; 10:7208-7215. [PMID: 27387010 DOI: 10.1021/acsnano.6b03700] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Long-range charge and exciton transport in quantum dot (QD) solids is a crucial challenge in utilizing QDs for optoelectronic applications. Here, we present a direct visualization of exciton diffusion in highly ordered CdSe QDs superlattices by mapping exciton population using ultrafast transient absorption microscopy. A temporal resolution of ∼200 fs and a spatial precision of ∼50 nm of this technique provide a direct assessment of the upper limit for exciton transport in QD solids. An exciton diffusion length of ∼125 nm has been visualized in the 3 ns experimental time window and an exciton diffusion coefficient of (2.5 ± 0.2) × 10(-2) cm(2) s(-1) has been measured for superlattices constructed from 3.6 nm CdSe QDs with center-to-center distance of 6.7 nm. The measured exciton diffusion constant is in good agreement with Förster resonance energy transfer theory. We have found that exciton diffusion is greatly enhanced in the superlattices over the disordered films with an order of magnitude higher diffusion coefficient, pointing toward the role of disorder in limiting transport. This study provides important understandings on energy transport mechanisms in both the spatial and temporal domains in QD solids.
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Affiliation(s)
- Seog Joon Yoon
- Radiation Laboratory, University of Notre Dame , Notre Dame, Indiana 46556, United States
- Department of Chemistry and Biochemistry, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Zhi Guo
- Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States
| | - Paula C Dos Santos Claro
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Libai Huang
- Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States
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31
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Kwon SG, Chattopadhyay S, Koo B, Dos Santos Claro PC, Shibata T, Requejo FG, Giovanetti LJ, Liu Y, Johnson C, Prakapenka V, Lee B, Shevchenko EV. Oxidation Induced Doping of Nanoparticles Revealed by in Situ X-ray Absorption Studies. Nano Lett 2016; 16:3738-3747. [PMID: 27152970 DOI: 10.1021/acs.nanolett.6b01072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Doping is a well-known approach to modulate the electronic and optical properties of nanoparticles (NPs). However, doping at nanoscale is still very challenging, and the reasons for that are not well understood. We studied the formation and doping process of iron and iron oxide NPs in real time by in situ synchrotron X-ray absorption spectroscopy. Our study revealed that the mass flow of the iron triggered by oxidation is responsible for the internalization of the dopant (molybdenum) adsorbed at the surface of the host iron NPs. The oxidation induced doping allows controlling the doping levels by varying the amount of dopant precursor. Our in situ studies also revealed that the dopant precursor substantially changes the reaction kinetics of formation of iron and iron oxide NPs. Thus, in the presence of dopant precursor we observed significantly faster decomposition rate of iron precursors and substantially higher stability of iron NPs against oxidation. The same doping mechanism and higher stability of host metal NPs against oxidation was observed for cobalt-based systems. Since the internalization of the adsorbed dopant at the surface of the host NPs is driven by the mass transport of the host, this mechanism can be potentially applied to introduce dopants into different oxidized forms of metal and metal alloy NPs providing the extra degree of compositional control in material design.
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Affiliation(s)
| | - Soma Chattopadhyay
- CSRRI-IIT, MRCAT, Argonne National Laboratory , Argonne, Illinois 60439 United States
- Physics Department, Advanced Materials Group, Illinois Institute of Technology , Chicago, Illinois 60616, United States
| | | | - Paula Cecilia Dos Santos Claro
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) , Dpto. de Química, FCE-UNLP, CONICET, La Plata 1900 Argentina
| | - Tomohiro Shibata
- CSRRI-IIT, MRCAT, Argonne National Laboratory , Argonne, Illinois 60439 United States
- Physics Department, Advanced Materials Group, Illinois Institute of Technology , Chicago, Illinois 60616, United States
| | - Félix G Requejo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) , Dpto. de Química, FCE-UNLP, CONICET, La Plata 1900 Argentina
| | - Lisandro J Giovanetti
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) , Dpto. de Química, FCE-UNLP, CONICET, La Plata 1900 Argentina
| | | | | | - Vitali Prakapenka
- Center of Advanced Radiation Sources, University of Chicago , Argonne, Illinois 60439, United States
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Lukshin VA, Usachev DY, Pronin IN, Shmigel'skiy AV, Akhmedov AD, Shevchenko EV. Criteria of the efficacy of surgical brain revascularization in patients with chronic cerebral ischemia. Zh Vopr Neirokhir Im N N Burdenko 2016; 80:53-62. [PMID: 27070258 DOI: 10.17116/neiro201680253-62] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE The article analyzes results of surgical revascularization in patients with symptoms of chronic cerebral ischemia caused by occlusion of the carotid arteries. MATERIAL AND METHODS We analyzed 404 surgeries for placement of extra-intracranial microvascular anastomoses (EICMAs) performed in 376 patients between 2000 and 2015. All patients underwent detailed neurological and neuropsychological examinations before surgery and throughout the follow-up period using the neurological deficit scale (NIHSS). Additionally, the medical history data, technical features of surgery, and results of instrumental tests were recorded. For a more detailed study of the cerebral circulation, a SCT perfusion examination was conducted in 58 patients before and after placement of EICMA. RESULTS All patients were divided into 3 groups, depending on the surgical treatment outcomes: improvement (53%), without significant changes (43%), and worsening of clinical symptoms (4%). A statistical analysis revealed that the efficacy of EICMA surgery ranged from 22 to 79% and was reliably confirmed by hemodynamic and anamnestic factors as well as by technical details of surgery. CONCLUSION When determining the indications for surgical revascularization in patients with ischemic stroke consequences, the patient's age, occlusion duration, location and size of ischemic lesions should be considered. Also, the choice of the acceptor artery and blood flow through the created anastomosis are of great importance.
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Affiliation(s)
- V A Lukshin
- Burdenko Neurosurgical Institute, Moscow, Russia
| | - D Yu Usachev
- Burdenko Neurosurgical Institute, Moscow, Russia
| | - I N Pronin
- Burdenko Neurosurgical Institute, Moscow, Russia
| | | | - A D Akhmedov
- Burdenko Neurosurgical Institute, Moscow, Russia
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33
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Lee J, Brennan MB, Wilton R, Rowland CE, Rozhkova EA, Forrester S, Hannah DC, Carlson J, Shevchenko EV, Schabacker DS, Schaller RD. Fast, Ratiometric FRET from Quantum Dot Conjugated Stabilized Single Chain Variable Fragments for Quantitative Botulinum Neurotoxin Sensing. Nano Lett 2015; 15:7161-7167. [PMID: 26397120 DOI: 10.1021/acs.nanolett.5b03442] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Botulinum neurotoxin (BoNT) presents a significant hazard under numerous realistic scenarios. The standard detection scheme for this fast-acting toxin is a lab-based mouse lethality assay that is sensitive and specific, but slow (∼2 days) and requires expert administration. As such, numerous efforts have aimed to decrease analysis time and reduce complexity. Here, we describe a sensitive ratiometric fluorescence resonance energy transfer scheme that utilizes highly photostable semiconductor quantum dot (QD) energy donors and chromophore conjugation to compact, single chain variable antibody fragments (scFvs) to yield a fast, fieldable sensor for BoNT with a 20-40 pM detection limit, toxin quantification, adjustable dynamic range, sensitivity in the presence of interferents, and sensing times as fast as 5 min. Through a combination of mutations, we achieve stabilized scFv denaturation temperatures of more than 60 °C, which bolsters fieldability. We also describe adaptation of the assay into a microarray format that offers persistent monitoring, reuse, and multiplexing.
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Affiliation(s)
- Joonseok Lee
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Melissa B Brennan
- Biosciences, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Rosemarie Wilton
- Biosciences, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Clare E Rowland
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Elena A Rozhkova
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Sara Forrester
- Global Security Sciences, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Daniel C Hannah
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Julia Carlson
- College of Agricultural & Life Sciences, University of Wisconsin , Madison, Wisconsin 53706, United States
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Daniel S Schabacker
- Global Security Sciences, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Richard D Schaller
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
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34
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Lin XM, Sun Y, Shevchenko EV, Sankaranarayanan SKRS, John D, Fedin I, Bresme F, Möhwald H, Moriarty P, Sorensen CM, Law BM. Highlights of the Faraday Discussion on Nanoparticle Synthesis and Assembly, Argonne, USA, April 2015. Chem Commun (Camb) 2015; 51:13725-30. [PMID: 26281789 DOI: 10.1039/c5cc90369f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Xiao-Min Lin
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
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35
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Kwon SG, Krylova G, Phillips PJ, Klie RF, Chattopadhyay S, Shibata T, Bunel EE, Liu Y, Prakapenka VB, Lee B, Shevchenko EV. Heterogeneous nucleation and shape transformation of multicomponent metallic nanostructures. Nat Mater 2015; 14:215-23. [PMID: 25362354 DOI: 10.1038/nmat4115] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 09/19/2014] [Indexed: 05/26/2023]
Abstract
To be able to control the functions of engineered multicomponent nanomaterials, a detailed understanding of heterogeneous nucleation at the nanoscale is essential. Here, by using in situ synchrotron X-ray scattering, we show that in the heterogeneous nucleation and growth of Au on Pt or Pt-alloy seeds the heteroepitaxial growth of the Au shell exerts high stress (∼2 GPa) on the seed by forming a core/shell structure in the early stage of the reaction. The development of lattice strain and subsequent strain relaxation, which we show using atomic-resolution transmission electron microscopy to occur through the slip of {111} layers, induces morphological changes from a core/shell to a dumbbell structure, and governs the nucleation and growth kinetics. We also propose a thermodynamic model for the nucleation and growth of dumbbell metallic heteronanostructures.
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Affiliation(s)
- Soon Gu Kwon
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - Galyna Krylova
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - Patrick J Phillips
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Robert F Klie
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - Soma Chattopadhyay
- 1] CSRRI-IIT, MRCAT, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA [2] Physics Department, Advanced Materials Group, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - Tomohiro Shibata
- 1] CSRRI-IIT, MRCAT, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA [2] Physics Department, Advanced Materials Group, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - Emilio E Bunel
- Chemical Science and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - Yuzi Liu
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Argonne, Illinois 60439, USA
| | - Byeongdu Lee
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - Elena V Shevchenko
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
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36
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Koo B, Goli P, Sumant AV, dos Santos Claro PC, Rajh T, Johnson CS, Balandin AA, Shevchenko EV. Toward lithium ion batteries with enhanced thermal conductivity. ACS Nano 2014; 8:7202-7207. [PMID: 24995678 DOI: 10.1021/nn502212b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
As batteries become more powerful and utilized in diverse applications, thermal management becomes one of the central problems in their application. We report the results on thermal properties of a set of different Li-ion battery electrodes enhanced with multiwalled carbon nanotubes. Our measurements reveal that the highest in-plane and cross-plane thermal conductivities achieved in the carbon-nanotube-enhanced electrodes reached up to 141 and 3.6 W/mK, respectively. The values for in-plane thermal conductivity are up to 2 orders of magnitude higher than those for conventional electrodes based on carbon black. The electrodes were synthesized via an inexpensive scalable filtration method, and we demonstrate that our approach can be extended to commercial electrode-active materials. The best performing electrodes contained a layer of γ-Fe2O3 nanoparticles on carbon nanotubes sandwiched between two layers of carbon nanotubes and had in-plane and cross-plane thermal conductivities of ∼50 and 3 W/mK, respectively, at room temperature. The obtained results are important for thermal management in Li-ion and other high-power-density batteries.
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Affiliation(s)
- Bonil Koo
- Center for Nanoscale Materials and ‡Chemical Sciences and Engineering, Argonne National Laboratory , Argonne, Illinois 60439, United States
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37
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Demortière A, Schaller RD, Li T, Chattopadhyay S, Krylova G, Shibata T, dos Santos Claro PC, Rowland CE, Miller JT, Cook R, Lee B, Shevchenko EV. In Situ Optical and Structural Studies on Photoluminesence Quenching in CdSe/CdS/Au Heterostructures. J Am Chem Soc 2014; 136:2342-50. [DOI: 10.1021/ja4092616] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Arnaud Demortière
- Physics
Department, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Richard D. Schaller
- Department
of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208, United States
| | | | - Soma Chattopadhyay
- CSRRI-IIT, MRCAT, Sector 10, Bldg 433B, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Physics
Department, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | | | - Tomohiro Shibata
- CSRRI-IIT, MRCAT, Sector 10, Bldg 433B, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Physics
Department, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | | | - Clare E. Rowland
- Department
of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208, United States
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38
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Son JS, Lee JS, Shevchenko EV, Talapin DV. Magnet-in-the-Semiconductor Nanomaterials: High Electron Mobility in All-Inorganic Arrays of FePt/CdSe and FePt/CdS Core-Shell Heterostructures. J Phys Chem Lett 2013; 4:1918-23. [PMID: 26283129 DOI: 10.1021/jz400612d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We report a colloidal synthesis and electrical and magnetotransport properties of multifunctional "magnet-in-the-semiconductor" nanostructures composed of FePt core and CdSe or CdS shell. Thin films of all-inorganic FePt/CdSe and FePt/CdS core-shell nanostructures capped with In2Se4(2-) molecular chalcogenide (MCC) ligands exhibited n-type charge transport with high field-effect electron mobility of 3.4 and 0.02 cm(2)/V·s, respectively. These nanostructures also showed a negative magnetoresistance characteristic for spin-dependent tunneling. We discuss the mechanism of charge transport and gating in the arrays of metal/semiconductor core-shell nanostructures.
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Affiliation(s)
- Jae Sung Son
- †Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Jong-Soo Lee
- †Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
- ‡Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, South Korea
| | - Elena V Shevchenko
- §Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois 60439, United States
| | - Dmitri V Talapin
- †Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
- §Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois 60439, United States
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39
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Xiong H, Yildirim H, Podsiadlo P, Zhang J, Prakapenka VB, Greeley JP, Shevchenko EV, Zhuravlev KK, Tkachev S, Sankaranarayanan SKRS, Rajh T. Compositional tuning of structural stability of lithiated cubic titania via a vacancy-filling mechanism under high pressure. Phys Rev Lett 2013; 110:078304. [PMID: 25166416 DOI: 10.1103/physrevlett.110.078304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Indexed: 06/03/2023]
Abstract
Experimental and theoretical studies on the compositional dependence of stability and compressibility in lithiated cubic titania are presented. The crystalline-to-amorphous phase transition pressure increases monotonically with Li concentration (from ∼17.5 GPa for delithiated to no phase transition for fully lithiated cubic titania up to 60 GPa). The associated enhancement in structural stability is postulated to arise from a vacancy filling mechanism in which an applied pressure drives interstitial Li ions to vacancy sites in the oxide interior. The results are of significance for understanding mechanisms of structural response of metal oxide electrode materials at high pressures as well as emerging energy storage technologies utilizing such materials.
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Affiliation(s)
- Hui Xiong
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Handan Yildirim
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Paul Podsiadlo
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Jun Zhang
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Jeffrey P Greeley
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Elena V Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
| | - Kirill K Zhuravlev
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Sergey Tkachev
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | | | - Tijana Rajh
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
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40
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Podsiadlo P, Kwon SG, Koo B, Lee B, Prakapenka VB, Dera P, Zhuravlev KK, Krylova G, Shevchenko EV. How "hollow" are hollow nanoparticles? J Am Chem Soc 2013; 135:2435-8. [PMID: 23360327 DOI: 10.1021/ja311926r] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Diamond anvil cell (DAC), synchrotron X-ray diffraction (XRD), and small-angle X-ray scattering (SAXS) techniques are used to probe the composition inside hollow γ-Fe(3)O(4) nanoparticles (NPs). SAXS experiments on 5.2, 13.3, and 13.8 nm hollow-shell γ-Fe(3)O(4) NPs, and 6 nm core/14.8 nm hollow-shell Au/Fe(3)O(4) NPs, reveal the significantly high (higher than solvent) electron density of the void inside the hollow shell. In high-pressure DAC experiments using Ne as pressure-transmitting medium, formation of nanocrystalline Ne inside hollow NPs is not detected by XRD, indicating that the oxide shell is impenetrable. Also, FTIR analysis on solutions of hollow-shell γ-Fe(3)O(4) NPs fragmented upon refluxing shows no evidence of organic molecules from the void inside, excluding the possibility that organic molecules get through the iron oxide shell during synthesis. High-pressure DAC experiments on Au/Fe(3)O(4) core/hollow-shell NPs show good transmittance of the external pressure to the gold core, indicating the presence of the pressure-transmitting medium in the gap between the core and the hollow shell. Overall, our data reveal the presence of most likely small fragments of iron and/or iron oxide in the void of the hollow NPs. The iron oxide shell seems to be non-porous and impenetrable by gases and liquids.
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Affiliation(s)
- Paul Podsiadlo
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
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41
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Shevchenko EV, Golubev VL, Danilov AB, Gak SE, Simonov SG. [A role of information-education programs in the treatment of patients with chronic headache]. Zh Nevrol Psikhiatr Im S S Korsakova 2013; 113:59-63. [PMID: 24429950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
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42
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Kwon SG, Krylova G, Sumer A, Schwartz MM, Bunel EE, Marshall CL, Chattopadhyay S, Lee B, Jellinek J, Shevchenko EV. Capping ligands as selectivity switchers in hydrogenation reactions. Nano Lett 2012; 12:5382-8. [PMID: 22988832 DOI: 10.1021/nl3027636] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We systematically investigated the role of surface modification of nanoparticles catalyst in alkyne hydrogenation reactions and proposed the general explanation of effect of surface ligands on the selectivity and activity of Pt and Co/Pt nanoparticles (NPs) using experimental and computational approaches. We show that the proper balance between adsorption energetics of alkenes at the surface of NPs as compared to that of capping ligands defines the selectivity of the nanocatalyst for alkene in alkyne hydrogenation reaction. We report that addition of primary alkylamines to Pt and CoPt(3) NPs can drastically increase selectivity for alkene from 0 to more than 90% with ~99.9% conversion. Increasing the primary alkylamine coverage on the NP surface leads to the decrease in the binding energy of octenes and eventual competition between octene and primary alkylamines for adsorption sites. At sufficiently high coverage of catalysts with primary alkylamine, the alkylamines win, which prevents further hydrogenation of alkenes into alkanes. Primary amines with different lengths of carbon chains have similar adsorption energies at the surface of catalysts and, consequently, the same effect on selectivity. When the adsorption energy of capping ligands at the catalytic surface is lower than adsorption energy of alkenes, the ligands do not affect the selectivity of hydrogenation of alkyne to alkene. On the other hand, capping ligands with adsorption energies at the catalytic surface higher than that of alkyne reduce its activity resulting in low conversion of alkynes.
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Affiliation(s)
- Soon Gu Kwon
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
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43
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Koo B, Xiong H, Slater MD, Prakapenka VB, Balasubramanian M, Podsiadlo P, Johnson CS, Rajh T, Shevchenko EV. Hollow iron oxide nanoparticles for application in lithium ion batteries. Nano Lett 2012; 12:2429-35. [PMID: 22468698 DOI: 10.1021/nl3004286] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Material design in terms of their morphologies other than solid nanoparticles can lead to more advanced properties. At the example of iron oxide, we explored the electrochemical properties of hollow nanoparticles with an application as a cathode and anode. Such nanoparticles contain very high concentration of cation vacancies that can be efficiently utilized for reversible Li ion intercalation without structural change. Cycling in high voltage range results in high capacity (∼132 mAh/g at 2.5 V), 99.7% Coulombic efficiency, superior rate performance (133 mAh/g at 3000 mA/g) and excellent stability (no fading at fast rate during more than 500 cycles). Cation vacancies in hollow iron oxide nanoparticles are also found to be responsible for the enhanced capacity in the conversion reactions. We monitored in situ structural transformation of hollow iron oxide nanoparticles by synchrotron X-ray absorption and diffraction techniques that provided us clear understanding of the lithium intercalation processes during electrochemical cycling.
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Affiliation(s)
- Bonil Koo
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
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44
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Krylova G, Giovanetti LJ, Requejo FG, Dimitrijevic NM, Prakapenka A, Shevchenko EV. Study of Nucleation and Growth Mechanism of the Metallic Nanodumbbells. J Am Chem Soc 2012; 134:4384-92. [DOI: 10.1021/ja211459p] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Galyna Krylova
- Center for Nanoscale
Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Lisandro J. Giovanetti
- INIFTA, CONICET and Dto. Física,
Facultad de Ciencias Exactas, Universidad Nacional de La Plata, P.O. Box 16, Suc. 4, 1900 La Plata, Buenos
Aires, Argentina
| | - Felix G. Requejo
- INIFTA, CONICET and Dto. Física,
Facultad de Ciencias Exactas, Universidad Nacional de La Plata, P.O. Box 16, Suc. 4, 1900 La Plata, Buenos
Aires, Argentina
| | - Nada M. Dimitrijevic
- Center for Nanoscale
Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Chemical Sciences
and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Alesia Prakapenka
- Center for Nanoscale
Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
- University of Illinois at Urbana−Champaign, Champaign, Illinois 61820,
United States
| | - Elena V. Shevchenko
- Center for Nanoscale
Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States
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45
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Bodnarchuk MI, Shevchenko EV, Talapin DV. Structural Defects in Periodic and Quasicrystalline Binary Nanocrystal Superlattices. J Am Chem Soc 2011; 133:20837-49. [DOI: 10.1021/ja207154v] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maryna I. Bodnarchuk
- Department of Chemistry and James Frank Institute, University of Chicago, Chicago, Illinois 60637, United States
| | - Elena V. Shevchenko
- Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois 60439, United States
| | - Dmitri V. Talapin
- Department of Chemistry and James Frank Institute, University of Chicago, Chicago, Illinois 60637, United States
- Center for Nanoscale Materials, Argonne National Lab, Argonne, Illinois 60439, United States
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46
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Chen A, DePrince AE, Demortière A, Joshi-Imre A, Shevchenko EV, Gray SK, Welp U, Vlasko-Vlasov VK. Self-assembled large Au nanoparticle arrays with regular hot spots for SERS. Small 2011; 7:2365-2371. [PMID: 21630447 DOI: 10.1002/smll.201100686] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2011] [Indexed: 05/30/2023]
Abstract
The cost-effective self-assembly of 80 nm Au nanoparticles (NPs) into large-domain, hexagonally close-packed arrays for high-sensitivity and high-fidelity surface-enhanced Raman spectroscopy (SERS) is demonstrated. These arrays exhibit specific optical resonances due to strong interparticle coupling, which are well reproduced by finite-difference time-domain (FDTD) simulations. The gaps between NPs form a regular lattice of hot spots that enable a large amplification of both photoluminescence and Raman signals. At smaller wavelengths the hot spots are extended away from the minimum-gap positions, which allows SERS of larger analytes that do not fit into small gaps. Using CdSe quantum dots (QDs) a 3-5 times larger photoluminescence enhancement than previously reported is experimentally demonstrated and an unambiguous estimate of the electromagnetic SERS enhancement factor of ≈10(4) is obtained by direct scanning electron microscopy imaging of QDs responsible for the Raman signal. Much stronger enhancement of ≈10(8) is obtained at larger wavelengths for benzenethiol molecules penetrating the NP gaps.
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Affiliation(s)
- Aiqing Chen
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA.
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47
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Podsiadlo P, Lee B, Prakapenka VB, Krylova GV, Schaller RD, Demortière A, Shevchenko EV. High-pressure structural stability and elasticity of supercrystals self-assembled from nanocrystals. Nano Lett 2011; 11:579-588. [PMID: 21175220 DOI: 10.1021/nl103587u] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report here combined quasi-hydrostatic high-pressure small-angle X-ray scattering (SAXS) and X-ray diffraction (XRD) studies on faceted 3D supercrystals (SCs) self-assembled from colloidal 7.0 nm spherical PbS nanocrystals (NCs). Diamond anvil cell (DAC) SAXS experiments in the pressure range from ambient to 12.5 GPa revealed nearly perfect structural stability of the SCs, with face-centered cubic organization of the NCs. Pressure-induced ordering (annealing effect) of the superstructure was observed. The ambient pressure bulk modulus of the SCs was calculated to be ∼5 GPa for compression and ∼14.5 GPa for decompression from fitting of Vinet and Birch-Murnaghan equations of state. XRD measurements revealed strong preferential crystallographic orientation of the NCs through all phase transformations to as high as 55 GPa without any indication of NC sintering. The first phase transition pressure of the NCs was found between 8.1 and 9.2 GPa and proceeds through homogeneous nucleation. Bulk modulus of PbS NCs was calculated to be ∼51 GPa based on fitting to the equations of state (K(PbS,bulk) ∼ 51-57 GPa). Closest surface-to-surface distance between the NCs in the SCs was calculated based on combined XRD and SAXS data, to reversibly tune from ∼1.56 nm to ∼0.9-0.92 nm and back to ∼1.36 nm in the ambient-12.5 GPa-ambient pressure cycle. The bulk modulus of the ligand matrix was extrapolated to be ∼2.2-2.95 GPa. These results show a general method of tuning NC interactions in packed nanoparticle solids.
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Affiliation(s)
- Paul Podsiadlo
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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48
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Krylova G, Dimitrijevic NM, Talapin DV, Guest JR, Borchert H, Lobo A, Rajh T, Shevchenko EV. Probing the Surface of Transition-Metal Nanocrystals by Chemiluminesence. J Am Chem Soc 2010; 132:9102-10. [DOI: 10.1021/ja102413k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Galyna Krylova
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
| | - Nada M. Dimitrijevic
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
| | - Dmitri V. Talapin
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
| | - Jeffrey R. Guest
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
| | - Holger Borchert
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
| | - Arun Lobo
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
| | - Tijana Rajh
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
| | - Elena V. Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Chemistry, University of Chicago, Chicago, Illinois 60637, Energy and Semiconductor Research laboratory, Department of Physics, University of Oldenburg, Oldenburg, 26111, Germany, and HASYLAB at DESY, Hamburg, D-22607, Germany
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49
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Podsiadlo P, Krylova G, Lee B, Critchley K, Gosztola DJ, Talapin DV, Ashby PD, Shevchenko EV. The Role of Order, Nanocrystal Size, and Capping Ligands in the Collective Mechanical Response of Three-Dimensional Nanocrystal Solids. J Am Chem Soc 2010; 132:8953-60. [DOI: 10.1021/ja100464a] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul Podsiadlo
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Galyna Krylova
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Byeongdu Lee
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Kevin Critchley
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - David J. Gosztola
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Dmitri V. Talapin
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Paul D. Ashby
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Elena V. Shevchenko
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, School of Physics, University of Leeds, Leeds, LS29JT, United Kingdom, Chemistry Department, University of Chicago, Chicago, Illinois 60637, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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50
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Lee JS, Bodnarchuk MI, Shevchenko EV, Talapin DV. “Magnet-in-the-Semiconductor” FePt−PbS and FePt−PbSe Nanostructures: Magnetic Properties, Charge Transport, and Magnetoresistance. J Am Chem Soc 2010; 132:6382-91. [DOI: 10.1021/ja100029s] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jong-Soo Lee
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637 and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Maryna I. Bodnarchuk
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637 and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Elena V. Shevchenko
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637 and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - Dmitri V. Talapin
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637 and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
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