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Blachowicz T, Ehrmann A, Wortmann M. Exchange Bias in Nanostructures: An Update. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2418. [PMID: 37686926 PMCID: PMC10489968 DOI: 10.3390/nano13172418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/22/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023]
Abstract
Exchange bias (EB) is a unidirectional anisotropy occurring in exchange-coupled ferromagnetic/antiferromagnetic systems, such as thin films, core-shell particles, or nanostructures. In addition to a horizontal shift of the hysteresis loop, defining the exchange bias, asymmetric loops and even vertical shifts can often be found. While the effect is used in hard disk read heads and several spintronics applications, its origin is still not fully understood. Especially in nanostructures with their additional shape anisotropies, interesting and often unexpected effects can occur. Here, we provide an overview of the most recent experimental findings and theoretical models of exchange bias in nanostructures from different materials.
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Affiliation(s)
- Tomasz Blachowicz
- Institute of Physics—Center for Science and Education, Silesian University of Technology, ul. Konarskiego 22B, 44-100 Gliwice, Poland;
| | - Andrea Ehrmann
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts, Interaktion 1, 33619 Bielefeld, Germany
| | - Martin Wortmann
- Faculty of Physics, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany;
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2
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Ariful Islam M, Selvanathan V, Chelvanathan P, Mottakin M, Aminuzzaman M, Adib Ibrahim M, Muhammad G, Akhtaruzzaman M. Metal organic framework derived NiO x nanoparticles for application as a hole transport layer in perovskite solar cells. RSC Adv 2023; 13:12781-12791. [PMID: 37124018 PMCID: PMC10133838 DOI: 10.1039/d3ra02181e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 04/12/2023] [Indexed: 05/02/2023] Open
Abstract
NiO x as a hole transport layer (HTL) has gained a lot of research interest in perovskite solar cells (PSCs), owing to its high optical transmittance, high power conversion efficiency, wide band-gap and ease of fabrication. In this work, four different nickel based-metal organic frameworks (MOFs) using 1,3,5-benzenetricarboxylic acid (BTC), terephthalic acid (TPA), 2-aminoterephthalic acid (ATPA), and 2,5-dihydroxyterephthalic acid (DHTPA) ligands respectively, have been employed as precursors to synthesize NiO x NPs. The employment of different ligands was found to result in NiO x NPs with different structural, optical and morphological properties. The impact of calcination temperatures of the MOFs was also studied and according to field emission scanning electron microscopy (FESEM), all MOF-derived NiO x NPs exhibited lower particle size at lower calcination temperature. Upon optimization, Ni-TPA MOF derived NiO x NPs calcined at 600 °C were identified to be the best for hole transport layer application. To explore the photovoltaic performance, these NiO x NPs have been fabricated as a thin film and its structural, optical and electrical characteristics were analyzed. According to the findings, the band energy gap (E g) of the fabricated thin film has been found to be 3.25 eV and the carrier concentration, hole mobility and resistivity were also measured to be 6.8 × 1014 cm-3; 4.7 × 1014 Ω cm and 2.0 cm2 V-1 s-1, respectively. Finally, a numerical simulation was conducted using SCAPS-1D incorporating the optical and electrical parameters from the thin film analysis. FTO/TiO2/CsPbBr3/NiO x /C has been utilized as the device configuration which recorded an efficiency of 13.9% with V oc of 1.89 V, J sc of 11.07 mA cm-2, and FF of 66.6%.
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Affiliation(s)
- Md Ariful Islam
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) 43600 Bangi Selangor Malaysia
| | - Vidhya Selvanathan
- Institute of Sustainable Energy, Universiti Tenaga Nasional (The Energy University) Jalan Ikram-Uniten Kajang 43000 Selangor Malaysia
| | - Puvaneswaran Chelvanathan
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) 43600 Bangi Selangor Malaysia
| | - M Mottakin
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) 43600 Bangi Selangor Malaysia
- Department of Applied Chemistry and Chemical Engineering, Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj-8100 Bangladesh
| | - Mohammod Aminuzzaman
- Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman (UTAR), Perak Campus, Jalan Universiti Bandar Barat, 31900 Kampar Perak D. R. Malaysia
| | - Mohd Adib Ibrahim
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) 43600 Bangi Selangor Malaysia
| | - Ghulam Muhammad
- Department of Computer Engineering, College of Computer and Information Sciences, King Saud University Riyadh Saudi Arabia
| | - Md Akhtaruzzaman
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (UKM) 43600 Bangi Selangor Malaysia
- Graduate School of Pure and Applied Sciences, University of Tsukuba Tsukuba Ibaraki 305-8573 Japan
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3
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Deng H, Chen Z, Chen Y, Mei J, Xu W, Wang L, Peng DL. Nickel submicron particles synthesized via solvothermal approach in the presence of organic bases: formation mechanism and magnetic properties. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.130971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Derevianko S, Vasylchenko A, Kaplunenko V, Kharchuk M, Demchenko O, Spivak M. Antiviral Properties of Cerium Nanoparticles. ACTA UNIVERSITATIS AGRICULTURAE ET SILVICULTURAE MENDELIANAE BRUNENSIS 2022. [DOI: 10.11118/actaun.2022.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Khort A, Brookman-Amissah M, Hedberg J, Chang T, Mei N, Lundberg A, Sturve J, Blomberg E, Odnevall I. Influence of natural organic matter on the transformation of metal and metal oxide nanoparticles and their ecotoxic potency in vitro. NANOIMPACT 2022; 25:100386. [PMID: 35559892 DOI: 10.1016/j.impact.2022.100386] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 01/25/2022] [Accepted: 01/26/2022] [Indexed: 06/15/2023]
Abstract
Increased use and production of engineered nanoparticles (NPs) lead to an elevated risk of their diffuse dispersion into the aquatic environment and increased concern on unknown effects induced by their release into the aquatic ecosystem. An improved understanding of the environmental transformation processes of NPs of various surface characteristics is hence imperative for risk assessment and management. This study presents results on effects of natural organic matter (NOM) on the environmental transformation and dissolution of metal and metal oxide NPs of different surface and solubility properties in synthetic freshwater (FW) with and without NOM. Adsorption of NOM was evident on most of the studied NPs, except Sb and Sb2O3, which resulted in the formation of negatively charged colloids of higher stability and smaller size distribution compared with the same NPs in FW only. The dissolution rate of the NPs in the presence of NOM correlated with the strength of interactions between the carboxylate group of NOM and the particle surface, and resulted in either no (Mn, Sb, ZnO NPs), increased (Co, Sn NPs) and decreased (Ni, NiO, Sb2O3, Y2O3 NPs) levels of dissolution. One type of metal NP from each group (Mn, Ni, Sn) were investigated to assess whether observed differences in adsorption of NOM and dissolution would influence their ecotoxic potency. The results showed Mn, Ni, and Sn NPs to generate intracellular reactive oxygen species (ROS) in a time and dose-dependent manner. The extent of ROS generation in FW was similar for both Mn and Ni NPs but higher for Sn NPs. These findings are possibly related to interactions and infiltration of the NPs with the cells, which lead to redox imbalances which could induce oxidative stress and cell damage. At the same time, the presence of NOM generally reduced the intracellular ROS generation by 20-40% for the investigated NPs and also reduced cytotoxicity of Sn NPs, which can be attributed to the stronger interaction of carboxylate groups of NOM with the surface of the NPs.
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Affiliation(s)
- Alexander Khort
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas vag 51, SE-100 44 Stockholm, Sweden; National University of Science and Technology "MISiS", Research Center of Engineering Ceramic Nanomaterials, Moscow, Russia.
| | | | - Jonas Hedberg
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas vag 51, SE-100 44 Stockholm, Sweden; Surface Science Western, The University of Western Ontario, London, Ontario, Canada
| | - Tingru Chang
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas vag 51, SE-100 44 Stockholm, Sweden
| | - Nanxuan Mei
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas vag 51, SE-100 44 Stockholm, Sweden
| | - Annie Lundberg
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas vag 51, SE-100 44 Stockholm, Sweden
| | - Joachim Sturve
- University of Gothenburg, Department of Biological and Environmental Sciences, Gothenburg, Sweden
| | - Eva Blomberg
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas vag 51, SE-100 44 Stockholm, Sweden
| | - Inger Odnevall
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas vag 51, SE-100 44 Stockholm, Sweden; AIMES - Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska, Institutet and KTH Royal Institute of Technology, Stockholm, Sweden; Karolinska Institutet, Department of Neuroscience, SE-171 77 Stockholm, Sweden.
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Shafe AA, Hossain MD, Mayanovic RA, Roddatis V, Benamara M. Tuning Exchange Coupling in NiO-Based Bimagnetic Heterostructured Nanocrystals. ACS APPLIED MATERIALS & INTERFACES 2021; 13:24013-24023. [PMID: 34000195 DOI: 10.1021/acsami.1c02855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A series of bimagnetic heterostructured nanocrystals having an antiferromagnetic NiO core and a ferrimagnetic MnxNi1-xO and/or FiM Mn3O4 island nanophase overgrowth has been synthesized under varying aqueous solution pH conditions. The two-step self-assembly process employs a thermal decomposition method to synthesize NiO nanoparticles, followed by growth of the MnxNi1-xO and/or Mn3O4 nanophase over the NiO core using hydrothermal synthesis at pH values ranging from 2.4-7.0. The environmentally benign hydrothermal process involves pH control of the protonation vs hydroxylation reactions occurring at the nanoparticle surface. TEM analysis and Rietveld refinement of XRD data show that three distinct types of heterostructured nanocrystals occur: NiO/MnxNi1-xO core-shell-like heterostructures at the pH of 2.4, mixed NiO/MnxNi1-xO and/or/Mn3O4 core-overgrowth structures for 2.4 < pH < 4.5, and predominantly NiO/Mn3O4 core-island structures for pH > 4.5. The magnetic coercivity and exchange bias of the heterostructured nanocrystals vary systematically with the pH of the aqueous solution used to synthesize the samples. The temperature-dependent magnetization and hysteresis loop data are consistent with the nature of overlayer coverage of the NiO core. Our DFT based calculations show that the MnxNi1-xO phase has ferrimagnetic properties with a stable spin orientation along the ⟨111⟩ orientation. Furthermore, the calculations show that the magnetic anisotropy constant (K1) of the Mn3O4 phase is considerably larger than that of the MnxNi1-xO phase, which is confirmed by our experimental results. The coercivity and exchange bias field are the largest for the NiO/Mn3O4 core-island nanocrystals, synthesized at a pH value of 5.0, with robust values of nearly 6 kOe and 3 kOe, respectively. This work demonstrates the tunability of hydrothermal deposition, and concomitant magnetic coercivity and exchange bias properties, of MnxNi1-xO and/or Mn3O4 nanophase overgrowth over a NiO core with pH, that makes these heterostructured nanocrystals potentially useful for magnetic device, biomedical, and other applications.
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Affiliation(s)
- Abdullah Al Shafe
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, Missouri 65897, United States
| | - Mohammad Delower Hossain
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Robert A Mayanovic
- Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, Missouri 65897, United States
| | - Vladimir Roddatis
- GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
| | - Mourad Benamara
- University of Arkansas Nano-Bio Materials Characterization Facility, University of Arkansas, Fayetteville, Arkansas 72701, United States
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7
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Talebi P, Singh H, Rani E, Huttula M, Cao W. Surface plasmon-driven photocatalytic activity of Ni@NiO/NiCO 3 core-shell nanostructures. RSC Adv 2021; 11:2733-2743. [PMID: 35424227 PMCID: PMC8693841 DOI: 10.1039/d0ra09666k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/05/2021] [Indexed: 12/16/2022] Open
Abstract
Ni@NiO/NiCO3 core-shell nanostructures have been investigated for surface plasmon driven photocatalytic solar H2 generation without any co-catalyst. Huge variation in the photocatalytic activity has been observed in the pristine vs. post-vacuum annealed samples with the maximum H2 yield (∼110 μmol g-1 h-1) for the vacuum annealed sample (N70-100/2 h) compared to ∼92 μmol g-1 h-1 for the pristine (N70) photocatalyst. Thorough structural (X-ray diffraction) and spectroscopic (X-ray photoelectron spectroscopy and transmission electron microscopy coupled electron energy loss spectroscopy) investigations reveal the core Ni nanoparticle decorated with the shell, a composite of crystalline NiO and amorphous NiCO3. Significant visible light absorption at ∼475 nm in the UV-vis region along with the absence of a peak/edge corresponding to NiO suggest the role of surface plasmons in the observed catalytic activity. As per the proposed mechanism, amorphous NiCO3 in the shell has been suggested to serve as the dielectric medium/interface, which enhances the surface plasmon resonance and boosts the HER activity.
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Affiliation(s)
- Parisa Talebi
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
| | - Harishchandra Singh
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
| | - Ekta Rani
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
| | - Marko Huttula
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
- School of Materials Science and Engineering, Henan University of Science and Technology Luoyang 471023 Henan China
| | - Wei Cao
- Nano and Molecular Systems Research Unit, University of Oulu FIN-90014 Finland
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8
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Magnetic Nanoparticle-Based Drug Delivery Approaches for Preventing and Treating Biofilms in Cystic Fibrosis. MAGNETOCHEMISTRY 2020. [DOI: 10.3390/magnetochemistry6040072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Biofilm-associated infections pose a huge burden on healthcare systems worldwide, with recurrent lung infections occurring due to the persistence of biofilm bacteria populations. In cystic fibrosis (CF), thick viscous mucus acts not only as a physical barrier, but also serves as a nidus for infection. Increased antibiotic resistance in the recent years indicates that current therapeutic strategies aimed at biofilm-associated infections are “failing”, emphasizing the need to develop new and improved drug delivery systems with higher efficacy and efficiency. Magnetic nanoparticles (MNPs) have unique and favourable properties encompassing biocompatibility, biodegradability, magnetic and heat-mediated characteristics, making them suitable drug carriers. Additionally, an external magnetic force can be applied to enhance drug delivery to target sites, acting as “nano-knives”, cutting through the bacterial biofilm layer and characteristically thick mucus in CF. In this review, we explore the multidisciplinary approach of using current and novel MNPs as vehicles of drug delivery. Although many of these offer exciting prospects for future biofilm therapeutics, there are also major challenges of this emerging field that need to be addressed.
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9
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Fabrication of Au/Ni/NiO heterostructure nanowires by electrochemical deposition and their temperature dependent magnetic properties. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121186] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Arrigo R, Gallarati S, Schuster ME, Seymour JM, Gianolio D, Silva I, Callison J, Feng H, Proctor JE, Ferrer P, Venturini F, Grinter D, Held G. Influence of Synthesis Conditions on the Structure of Nickel Nanoparticles and their Reactivity in Selective Asymmetric Hydrogenation. ChemCatChem 2020. [DOI: 10.1002/cctc.201901955] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Rosa Arrigo
- School of Science Engineering and EnvironmentUniversity of Salford Manchester M5 4WT UK
- Diamond Light SourceHarwell Science and Innovation Campus Didcot OX11 0DE UK
| | - Simone Gallarati
- School of ChemistryUniversity of St Andrews North Haugh St Andrews KY16 9ST UK
| | | | - Jake M. Seymour
- Department of ChemistryUniversity of Reading Reading RG6 6AD UK
| | - Diego Gianolio
- Diamond Light SourceHarwell Science and Innovation Campus Didcot OX11 0DE UK
| | - Ivan Silva
- ISIS FacilityRutherford Appleton Laboratory Chilton Didcot OX11 0QX UK
| | - June Callison
- Department of ChemistryUniversity College London London WC1H 0AJ UK
- UK Catalysis Hub Research Complex at Harwell (RCaH)Rutherford Appleton Laboratory Harwell Oxon OX11 0FA UK
| | - Haosheng Feng
- Department of ChemistryUniversity of Cambridge Cambridge CB2 1EW UK
| | - John E. Proctor
- School of Science Engineering and EnvironmentUniversity of Salford Manchester M5 4WT UK
| | - Pilar Ferrer
- Diamond Light SourceHarwell Science and Innovation Campus Didcot OX11 0DE UK
| | - Federica Venturini
- Diamond Light SourceHarwell Science and Innovation Campus Didcot OX11 0DE UK
| | - David Grinter
- Diamond Light SourceHarwell Science and Innovation Campus Didcot OX11 0DE UK
| | - Georg Held
- Diamond Light SourceHarwell Science and Innovation Campus Didcot OX11 0DE UK
- Department of ChemistryUniversity of Reading Reading RG6 6AD UK
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He X, Xu Y, Yao X, Zhang C, Pu Y, Wang X, Mao W, Du Y, Zhong W. Large exchange bias and enhanced coercivity in strongly-coupled Ni/NiO binary nanoparticles. RSC Adv 2019; 9:30195-30206. [PMID: 35530194 PMCID: PMC9072138 DOI: 10.1039/c9ra03242h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 09/18/2019] [Indexed: 11/21/2022] Open
Abstract
In this study, Ni/NiO binary nanoparticles are synthesized utilizing a reflux method combined with a calcination process. The average size of the nanoparticles is 5–20 nm and the Ni content is 3.55%. Both the microstructures of the Ni/NiO interface and the states of different phases have significant impacts on the magnetic properties. By tuning the temperature and the cooling field during the loop measurement, the change rule of several critical parameters such as coercivity HC and exchange bias HE was complicated in nature. Both large HE (482 Oe) and enhanced HC (1335 Oe) were observed at 5 K, mainly due to the strong coupling interaction between Ni and NiO components. For current studies of the Ni/NiO binary nanoparticles, the complex magnetic behaviors are related to (i) the ferromagnetic contribution of Ni nanoparticles, (ii) the intrinsic antiferromagnetism of the volume phase of NiO, and (iii) the spin-glass-like characteristic corresponding to the frozen disordered state at the surface of partial NiO particles. The comprehensive effect of these three magnetic structures promotes the generation of a strongly-coupled Ni/NiO binary system, and improves the magnetic performance. Large exchange bias was obtained and the temperature dependence of the exchange bias was analyzed in detail.![]()
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Affiliation(s)
- Xuemin He
- New Energy Technology Engineering Laboratory of Jiangsu Province, Research Center of Information Physics, School of Science, Nanjing University of Posts and Telecommunications Nanjing 210023 P. R. China .,National Laboratory of Solid State Microstructures, Nanjing University Nanjing 210093 P. R. China
| | - Yingru Xu
- Department of Physics, Duke University Durham NC 27713 USA
| | - Xiujuan Yao
- National Laboratory of Solid State Microstructures, Nanjing University Nanjing 210093 P. R. China
| | - Chuangwei Zhang
- New Energy Technology Engineering Laboratory of Jiangsu Province, Research Center of Information Physics, School of Science, Nanjing University of Posts and Telecommunications Nanjing 210023 P. R. China
| | - Yong Pu
- New Energy Technology Engineering Laboratory of Jiangsu Province, Research Center of Information Physics, School of Science, Nanjing University of Posts and Telecommunications Nanjing 210023 P. R. China
| | - Xingfu Wang
- New Energy Technology Engineering Laboratory of Jiangsu Province, Research Center of Information Physics, School of Science, Nanjing University of Posts and Telecommunications Nanjing 210023 P. R. China
| | - Weiwei Mao
- New Energy Technology Engineering Laboratory of Jiangsu Province, Research Center of Information Physics, School of Science, Nanjing University of Posts and Telecommunications Nanjing 210023 P. R. China
| | - Youwei Du
- National Laboratory of Solid State Microstructures, Nanjing University Nanjing 210093 P. R. China
| | - Wei Zhong
- National Laboratory of Solid State Microstructures, Nanjing University Nanjing 210093 P. R. China
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He XM, Zhang CW, Guo FF, Yan SM, Li YT, Liu LQ, Zhang HG, Du YW, Zhong W. Exchange-biased hybrid γ-Fe 2O 3/NiO core-shell nanostructures: three-step synthesis, microstructure, and magnetic properties. Phys Chem Chem Phys 2019; 21:11967-11976. [PMID: 31134262 DOI: 10.1039/c9cp01265f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A two-step solvothermal method combining a calcination process was conducted to synthesize γ-Fe2O3/NiO core-shell nanostructures with controlled microstructure. The formation mechanism of this binary system has been discussed, and the influence of microstructures on magnetic properties has been analyzed in detail. Microstructural characterizations reveal that the NiO shells consisted of many irregular nanosheets with disordered orientations and monocrystalline structures, packed on the surface of the γ-Fe2O3 microspheres. Both the grain size and NiO content of nanostructures increase with the increasing calcination temperature from 300 °C to 400 °C, accompanied by an enhancement of the compactness of NiO shells. Magnetic studies indicate that their magnetic properties are determined by four factors: the size effect, NiO phase content, interface microstructure, i.e. contact mode, area, roughness and compactness, and FM-AFM (where FM and AFM denote the ferromagnetic γ-Fe2O3 and the antiferromagnetic NiO components, respectively) coupling effect. At 5 K, the γ-Fe2O3/NiO core-shell nanostructures display certain exchange bias (HE = 60 Oe) and enhanced coercivity (HC = 213 Oe).
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Affiliation(s)
- Xue-Min He
- New Energy Technology Engineering Laboratory of Jiangsu Province, Research Center of Information Physics and School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, P. R. China.
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Manigandan R, Dhanasekaran T, Padmanaban A, Giribabu K, Suresh R, Narayanan V. Bifunctional hexagonal Ni/NiO nanostructures: influence of the core-shell phase on magnetism, electrochemical sensing of serotonin, and catalytic reduction of 4-nitrophenol. NANOSCALE ADVANCES 2019; 1:1531-1540. [PMID: 36132609 PMCID: PMC9417847 DOI: 10.1039/c8na00342d] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 01/30/2019] [Indexed: 06/02/2023]
Abstract
Ni0/NiO (nickel/nickel oxide) core-shell nanostructures were synthesized through a facile combustible redox reaction. Remarkably, the hetero-phase boundary with different crystalline orientations offered dual properties, which helped in bifunctional catalysis. Presence of a metallic Ni phase changed physicochemical properties and some emerging applications (magnetic properties, optical conductivity, electrochemical sensitivity, catalytic behaviour) could be foreseen. Moreover, formation of a NiO layer on metal surface prevented magnetism-induced aggregation, arrested further oxidation by hindering oxygen diffusion, and acted as a good sorbent to enhance the surface adsorption of the analyte. Hexagonal Ni/NiO nanostructures manifested well-defined ferromagnetic behavior and the catalyst could be collected easily at the end of the catalytic reduction. Ni/NiO core-shell catalysts at the nanoscale had outstanding catalytic performance (reduction of 4-nitrophenol to 4-aminophenol) compared with pure NiO catalysts beyond a reaction time of ∼9 min. The estimated sensitivity, limit of detection and limit of quantification towards the electrochemical sensing of serotonin were 0.185, 0.43 and 1.47 μM μA-1, respectively. These results suggest that a bifunctional Ni/NiO nanostructure could be a suitable catalyst for electrochemical detection of serotonin and reduction of 4-nitrophenol.
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Affiliation(s)
- R Manigandan
- Department of Inorganic Chemistry, University of Madras Guindy Campus Chennai India
| | - T Dhanasekaran
- Department of Inorganic Chemistry, University of Madras Guindy Campus Chennai India
| | - A Padmanaban
- Department of Inorganic Chemistry, University of Madras Guindy Campus Chennai India
| | - K Giribabu
- Electrodics and Electrocatalysis Division, CSIR-CECRI Karaikudi India
| | - R Suresh
- Department of Analytical and Inorganic Chemistry, University of Concepcion Chile
| | - V Narayanan
- Department of Inorganic Chemistry, University of Madras Guindy Campus Chennai India
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14
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Gawai UP, Gaikwad DK, Bodke MR, Khawal HA, Pandey KK, Yadav AK, Jha SN, Bhattacharyya D, Dole BN. Doping effect on the local structure of metamagnetic Co doped Ni/NiO:GO core–shell nanoparticles using X-ray absorption spectroscopy and the pair distribution function. Phys Chem Chem Phys 2019; 21:1294-1307. [DOI: 10.1039/c8cp05267k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Core–shell nanoparticles of Co doped Ni/NiO and incorporated GO sheets evidenced that the metamagnetic behavior at 5 K to 300 K temperatures.
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Affiliation(s)
- U. P. Gawai
- Department of Physics
- YCSPM's
- DDSP
- Arts Commerce and Science College
- Dist- Jalgaon-425109
| | - D. K. Gaikwad
- Department of Physics
- Dr. Babasaheb Ambedkar Marathwada University
- Aurangabad – 431004
- India
| | - M. R. Bodke
- Department of Electronics
- Modern College of Arts
- Commerce and Science
- Pune-5
- India
| | - H. A. Khawal
- Advanced Materials Research Laboratory
- Department of Physics
- Dr Babasaheb Ambedkar Marathwada University
- Auranagabad-431004
- India
| | - K. K. Pandey
- High Pressure & Synchrotron Radiation Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - A. K. Yadav
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 094
- India
| | - S. N. Jha
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 094
- India
| | - D. Bhattacharyya
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 094
- India
| | - B. N. Dole
- Advanced Materials Research Laboratory
- Department of Physics
- Dr Babasaheb Ambedkar Marathwada University
- Auranagabad-431004
- India
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15
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Zheng L, Zhang X, Bustillo KC, Yao Y, Zhao L, Zhu M, Li W, Zheng H. Growth mechanism of core-shell PtNi-Ni nanoparticles using in situ transmission electron microscopy. NANOSCALE 2018; 10:11281-11286. [PMID: 29881854 DOI: 10.1039/c8nr01625a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Controlling the growth, morphology and structure of nanocrystals is fundamental to achieving facet dependent physical and chemical properties. Core-shell PtNi-Ni nanoparticles' evolution was investigated using in situ liquid cell transmission electron microscopy (TEM). A two-stage growth of core-shell PtNi-Ni nanoparticles was observed. The platinum (Pt)-based binary alloy was formed initially by a thermodynamically driven process, then grown by a monomer attachment process, and then the core formed and the process was stopped by depletion of the Pt precursor, and finally the nickel (Ni) shell formed. This growth process gives a way to grow a metallic shell for novel catalysts.
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Affiliation(s)
- Liyun Zheng
- College of Materials Science and Engineering, Hebei University of Engineering, Handan, Handan 056038, China.
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16
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You W, Che R. Excellent NiO-Ni Nanoplate Microwave Absorber via Pinning Effect of Antiferromagnetic-Ferromagnetic Interface. ACS APPLIED MATERIALS & INTERFACES 2018; 10:15104-15111. [PMID: 29649867 DOI: 10.1021/acsami.8b03610] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Materials with strong magnetic property that can provide excellent microwave absorption performance are highly desirable, especially if their dielectric and magnetic properties can be easily modulated, which make minimal thickness and ultrawide bandwidth become achievable. The magnetic properties of ferromagnetic (FM) and antiferromagnetic (AFM) composite materials are closely related to their ratio of composition, size, morphology, and structure. AFM-FM composites have become a popular alternative for microwave absorption; however, the controllable design and preparation need to be urgently optimized. Here, we have successfully prepared a series of platelike NiO-Ni composites and demonstrated the potential of such composites for microwave absorption. Strong magnetic coupling was found from NiO-Ni nanoparticles by electron holography, which makes NiO-Ni composites a highly efficient microwave absorber (strong reflection loss: -61.5 dB and broad bandwidth: 11.2 GHz, reflection loss < -10 dB). Our findings are helpful to develop a strong microwave absorber based on magnetic coupling.
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Affiliation(s)
- Wenbin You
- Laboratory of Advanced Materials, Department of Materials Science, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Fudan University , 220 Handan Road , Shanghai 200433 , China
| | - Renchao Che
- Laboratory of Advanced Materials, Department of Materials Science, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Fudan University , 220 Handan Road , Shanghai 200433 , China
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17
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Guo K, Li H, Yu Z. Size-Dependent Catalytic Activity of Monodispersed Nickel Nanoparticles for the Hydrolytic Dehydrogenation of Ammonia Borane. ACS APPLIED MATERIALS & INTERFACES 2018; 10:517-525. [PMID: 29243479 DOI: 10.1021/acsami.7b14166] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Nickel (Ni) nanoparticles (NPs) with controlled sizes in the range of 4.9-27.4 nm are synthesized by tuning the ratio of the nickel acetylacetonate precursor and trioctylphosphine in the presence of oleylamine. X-ray diffraction and transmission electron microscopy confirm the formation of the metallic Ni crystal phase and their monodispersed nature. These Ni NPs are found to be effective catalysts for the hydrolytic dehydrogenation of ammonia borane, and their catalytic activities are size-dependent. A volcano-type activity trend is observed with 8.9 nm Ni NPs presenting the best catalytic performance. The activation energy and turnover frequency (TOF) of the 8.9 nm NP catalyst are further calculated to be 66.6 kJ·mol-1 and 154.2 molH2·molNi-1·h-1, respectively. Characterization of the spent catalysts indicates that smaller-sized NPs face severe agglomeration, resulting in poor stability and activity. Three carbon support materials are thus used to disperse and stabilize the Ni NPs. It shows that 8.9 nm Ni NPs supported on Ketjenblack (KB) exhibit higher activity than that supported on carbon nanotubes and graphene nanoplatelets. The agglomeration-induced activity loss is further illustrated by immobilizing 4.9 nm Ni NPs onto KB, which exhibits significantly enhanced activity with a high TOF of 447.9 molH2·molNi-1·h-1 as well as an excellent reusability in the consecutive dehydrogenation of ammonia borane. The high catalytic performance can be attributed to the intrinsic activity of nanoparticulate Ni and the improved activity and stability due to the strong Ni/KB metal-support interactions.
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Affiliation(s)
| | - Hailong Li
- Department of Energy, Building and Environment, Mälardalen University , 72123 Västerås, Sweden
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18
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Liu Y, Kempinger S, He R, Day TD, Moradifar P, Yu SY, Russell JL, Torres VM, Xu P, Mallouk TE, Mohney SE, Alem N, Samarth N, Badding JV. Confined Chemical Fluid Deposition of Ferromagnetic Metalattices. NANO LETTERS 2018; 18:546-552. [PMID: 29236505 DOI: 10.1021/acs.nanolett.7b04633] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A magnetic, metallic inverse opal fabricated by infiltration into a silica nanosphere template assembled from spheres with diameters less than 100 nm is an archetypal example of a "metalattice". In traditional quantum confined structures such as dots, wires, and thin films, the physical dynamics in the free dimensions is typically largely decoupled from the behavior in the confining directions. In a metalattice, the confined and extended degrees of freedom cannot be separated. Modeling predicts that magnetic metalattices should exhibit multiple topologically distinct magnetic phases separated by sharp transitions in their hysteresis curves as their spatial dimensions become comparable to and smaller than the magnetic exchange length, potentially enabling an interesting class of "spin-engineered" magnetic materials. The challenge to synthesizing magnetic inverse opal metalattices from templates assembled from sub-100 nm spheres is in infiltrating the nanoscale, tortuous voids between the nanospheres void-free with a suitable magnetic material. Chemical fluid deposition from supercritical carbon dioxide could be a viable approach to void-free infiltration of magnetic metals in view of the ability of supercritical fluids to penetrate small void spaces. However, we find that conventional chemical fluid deposition of the magnetic late transition metal nickel into sub-100 nm silica sphere templates in conventional macroscale reactors produces a film on top of the template that appears to largely block infiltration. Other deposition approaches also face difficulties in void-free infiltration into such small nanoscale templates or require conducting substrates that may interfere with properties measurements. Here we report that introduction of "spatial confinement" into the chemical fluid reactor allows for fabrication of nearly void-free nickel metalattices by infiltration into templates with sphere sizes from 14 to 100 nm. Magnetic measurements suggest that these nickel metalattices behave as interconnected systems rather than as isolated superparamagnetic systems coupled solely by dipolar interactions.
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Affiliation(s)
- Yunzhi Liu
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Susan Kempinger
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Rongrui He
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Todd D Day
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Parivash Moradifar
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Shih-Ying Yu
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Jennifer L Russell
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Vincent M Torres
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Pengtao Xu
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Thomas E Mallouk
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Suzanne E Mohney
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Nasim Alem
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - Nitin Samarth
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
| | - John V Badding
- Department of Chemistry, ‡Department of Physics, §Department of Materials Science and Engineering, ∥Department of Biochemistry and Molecular Biology, and ⊥Materials Research Institute, Penn State University , University Park, Pennsylvania 16802, United States
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19
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Lynch BB, Anderson BD, Kennedy WJ, Tracy JB. Synthesis and chemical transformation of Ni nanoparticles embedded in silica. NANOSCALE 2017; 9:18959-18965. [PMID: 29181475 DOI: 10.1039/c7nr06379b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ni nanoparticles (NPs) catalyze many chemical reactions, in which they can become contaminated or agglomerate, resulting in poorer performance. We report deposition of silica (SiO2) onto Ni NPs from tetraethyl orthysilicate (TEOS) through a reverse microemulsion approach, which is accompanied by an unexpected etching process. Ni NPs with an average initial diameter of 27 nm were embedded in composite SiO2-overcoated Ni NPs (SiO2-Ni NPs) with an average diameter of 30 nm. Each SiO2-Ni NP contained a ∼7 nm oxidized Ni core and numerous smaller oxidized Ni NPs with diameters of ∼2 nm distributed throughout the SiO2 shell. Etching of the Ni NPs is attributed to use of ammonium hydroxide as a catalyst for deposition of SiO2. Aliquots acquired during the deposition and etching process reveal agglomeration of SiO2 and Ni NPs, followed by dissociation into highly uniform SiO2-Ni NPs. This etching and embedding process may also be extended to other core materials. The stability of SiO2-Ni NPs was also investigated under high-temperature oxidizing and reducing environments. The structure of the SiO2-Ni NPs remained significantly unchanged after both oxidation and reduction, which suggests structural durability when used for catalysis.
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Affiliation(s)
- Brian B Lynch
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.
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20
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Wu LK, Wu WY, Xia J, Cao HZ, Hou GY, Tang YP, Zheng GQ. Nanostructured NiCo@NiCoOx core-shell layer as efficient and robust electrocatalyst for oxygen evolution reaction. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.09.146] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Ashley B, Vakil PN, Lynch BB, Dyer CM, Tracy JB, Owens J, Strouse GF. Microwave Enhancement of Autocatalytic Growth of Nanometals. ACS NANO 2017; 11:9957-9967. [PMID: 28968093 DOI: 10.1021/acsnano.7b04040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The desire for designing efficient synthetic methods that lead to industrially important nanomaterials has led a desire to more fully understand the mechanism of growth and how modern synthetic techniques can be employed. Microwave (MW) synthesis is one such technique that has attracted attention as a green, sustainable method. The reports of enhancement of formation rates and improved quality for MW driven reactions are intriguing, but the lack of understanding of the reaction mechanism and how coupling to the MW field leads to these observations is concerning. In this manuscript, the growth of a metal nanoparticles (NPs) in a microwave cavity is spectroscopically analyzed and compared with the classical autocatalytic method of NP growth to elucidate the underpinnings for the observed enhanced growth behavior for metal NPs prepared in a MW field. The study illustrates that microwave synthesis of nickel and gold NPs below saturation conditions follows the Finke-Watzky mechanism of nucleation and growth. The enhancement of the reaction arises from the size-dependent increase in MW absorption cross section for the metal NPs. For Ni, the presence of oxides is considered via theoretical computations and compared to dielectric measurements of isolated nickel NPs. The study definitively shows that MW growth can be modeled by an autocatalytic mechanism that directly leads to the observed enhanced rates and improved quality widely reported in the nanomaterial community when MW irradiation is employed.
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Affiliation(s)
- Bridgett Ashley
- Department of Chemistry and Biochemistry, Florida State University ; Tallahassee, Florida 32306-4390, United States
- Air Force Civil Engineer Center, Tyndall Air Force Base , Panama City, Florida 32403, United States
| | - Parth N Vakil
- Department of Chemistry and Biochemistry, Florida State University ; Tallahassee, Florida 32306-4390, United States
| | - Brian B Lynch
- Department of Materials Science and Engineering, North Carolina State University ; Raleigh, North Carolina 27695, United States
| | - Christopher M Dyer
- Department of Chemistry and Biochemistry, Florida State University ; Tallahassee, Florida 32306-4390, United States
| | - Joseph B Tracy
- Department of Materials Science and Engineering, North Carolina State University ; Raleigh, North Carolina 27695, United States
| | - Jeffery Owens
- Air Force Civil Engineer Center, Tyndall Air Force Base , Panama City, Florida 32403, United States
| | - Geoffrey F Strouse
- Department of Chemistry and Biochemistry, Florida State University ; Tallahassee, Florida 32306-4390, United States
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22
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One-step solution combustion synthesis of pure Ni nanopowders with enhanced coercivity: The fuel effect. J SOLID STATE CHEM 2017. [DOI: 10.1016/j.jssc.2017.05.043] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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23
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Knez D, Thaler P, Volk A, Kothleitner G, Ernst WE, Hofer F. Transformation dynamics of Ni clusters into NiO rings under electron beam irradiation. Ultramicroscopy 2017; 176:105-111. [PMID: 28351552 DOI: 10.1016/j.ultramic.2017.03.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 12/02/2016] [Accepted: 12/06/2016] [Indexed: 11/29/2022]
Abstract
We report the transformation of nickel clusters into NiO rings by an electron beam induced nanoscale Kirkendall effect. High-purity nickel clusters consisting of a few thousand atoms have been used as precursors and were synthesized with the superfluid helium droplet technique. Aberration-corrected, analytical scanning transmission electron microscopy was applied to oxidise and simultaneously analyse the nanostructures. The transient dynamics of the oxidation could be documented by time lapse series using high-angle annular dark-field imaging and electron energy-loss spectroscopy. A two-step Cabrera-Mott oxidation mechanism was identified. It was found that water adsorbed adjacent to the clusters acts as oxygen source for the electron beam induced oxidation. The size-dependent oxidation rate was estimated by quantitative EELS measurements combined with molecular dynamics simulations. Our findings could serve to better control sample changes during examination in an electron microscope, and might provide a methodology to generate other metal oxide nanostructures.
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Affiliation(s)
- Daniel Knez
- Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria; Graz Centre for Electron Microscopy, Steyrergasse 17, 8010 Graz, Austria.
| | - Philipp Thaler
- Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
| | - Alexander Volk
- Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
| | - Gerald Kothleitner
- Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria; Graz Centre for Electron Microscopy, Steyrergasse 17, 8010 Graz, Austria
| | - Wolfgang E Ernst
- Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
| | - Ferdinand Hofer
- Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria; Graz Centre for Electron Microscopy, Steyrergasse 17, 8010 Graz, Austria
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24
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Publisher's Note. Ultramicroscopy 2017; 174:1-7. [DOI: 10.1016/j.ultramic.2016.12.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 12/02/2016] [Accepted: 12/06/2016] [Indexed: 10/20/2022]
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25
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Zhang S, Gao H, Li J, Huang Y, Alsaedi A, Hayat T, Xu X, Wang X. Rice husks as a sustainable silica source for hierarchical flower-like metal silicate architectures assembled into ultrathin nanosheets for adsorption and catalysis. JOURNAL OF HAZARDOUS MATERIALS 2017; 321:92-102. [PMID: 27614322 DOI: 10.1016/j.jhazmat.2016.09.004] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 08/31/2016] [Accepted: 09/03/2016] [Indexed: 05/10/2023]
Abstract
Metal silicates have attracted extensive interests due to their unique structure and promising properties in adsorption and catalysis. However, their applications were hampered by the complex and expensive synthesis. In this paper, three-dimensional (3D) hierarchical flower-like metal silicate, including magnesium silicate, zinc silicate, nickel silicate and cobalt silicate, were for the first time prepared by using rice husks as a sustainable silicon source. The flower-like morphology, interconnected ultrathin nanosheets structure and high specific surface area endowed them with versatile applications. Magnesium silicate was used as an adsorbent with the maximum adsorption capacities of 557.9, 381.3, and 482.8mg/g for Pb2+, tetracycline (TC), and UO22+, respectively. Ni nanoparticles/silica (Ni NPs/SiO2) exhibited high catalytic activity and good stability for 4-nitrophenol (4-NP) reduction within only ∼160s, which can be attributed to the ultra-small particle size (∼6.8nm), good dispersion and high loading capacity of Ni NPs. Considering the abundance and renewability of rice husks, metal silicate with complex architecture can be easily produced at a large scale and become a sustainable and reliable resource for multifunctional applications.
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Affiliation(s)
- Shouwei Zhang
- School of Physics and Technology, University of Jinan, Shandong, 250022, PR China; Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, PR China
| | - Huihui Gao
- School of Physics and Technology, University of Jinan, Shandong, 250022, PR China
| | - Jiaxing Li
- Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, PR China; NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - Yongshun Huang
- Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, PR China
| | - Ahmed Alsaedi
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Tasawar Hayat
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia; Department of Mathematics, Quaid-I-Azam University, Islamabad 44000, Pakistan
| | - Xijin Xu
- School of Physics and Technology, University of Jinan, Shandong, 250022, PR China.
| | - Xiangke Wang
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
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26
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Pandurangan P, Parvin TN, Soundiraraju B, Johnbosco Y, Ramalingam M, Bhagavathiachari M, Suthanthiraraj SA, Narayanan SS. Ultrasmall NiO nanoclusters modified with conical Ni(ii)-SR staples for high performance supercapacitor applications. NEW J CHEM 2017. [DOI: 10.1039/c6nj03678c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We report MPS stabilized ultrasmall NiO NCs for high performance supercapacitors.
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Affiliation(s)
- Prabhu Pandurangan
- Department of Physical Chemistry
- School of Chemical Sciences
- University of Madras
- Chennai 600 025
- India
| | - Thansila Nainar Parvin
- Department of Physical Chemistry
- School of Chemical Sciences
- University of Madras
- Chennai 600 025
- India
| | - Bhuvaneswari Soundiraraju
- Analytical and Spectroscopy Division
- Propellants, Polymers
- Chemicals and Materials Entity
- Vikram Sarabhai Space Centre
- Trivandrum 695 022
| | - Yesuraj Johnbosco
- Department of Energy
- School of Chemical Sciences
- University of Madras
- Chennai 600 025
- India
| | - Manikanadan Ramalingam
- Department of Analytical Chemistry
- School of Chemical Sciences
- University of Madras
- Chennai 600 025
- India
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27
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Sarker D, Bhattacharya S, Srivastava P, Ghosh S. Triggering of spin-flipping-modulated exchange bias in FeCo nanoparticles by electronic excitation. Sci Rep 2016; 6:39292. [PMID: 27991552 PMCID: PMC5171942 DOI: 10.1038/srep39292] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/21/2016] [Indexed: 11/15/2022] Open
Abstract
The exchange coupling between ferromagnetic (FM)-antiferromagnetic (AF) interfaces is a key element of modern spintronic devices. We here introduce a new way of triggering exchange bias (EB) in swift heavy ion (SHI) irradiated FeCo-SiO2 films, which is a manifestation of spin-flipping at high irradiation fluence. The elongation of FeCo nanoparticles (NPs) in SiO2 matrix gives rise to perpendicular magnetic anisotropy at intermediate fluence. However, a clear shift in hysteresis loop is evident at the highest fluence. This reveals the existence of an AF exchange pinning domain in the NPs, which is identified not to be oxide shell from XANES analysis. Thermal spike calculations along with first-principles based simulations under the framework of density functional theory (DFT) demonstrate that spin flipping of 3d valence electrons is responsible for formation of these AF domains inside the FM NPs. EXAFS experiments at Fe and Co K-edges further unravel that spin-flipping in highest fluence irradiated film results in reduced bond lengths. The results highlight the possibility of miniaturization of magnetic storage devices by using irradiated NPs instead of conventionally used FM-AF multilayers.
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Affiliation(s)
- Debalaya Sarker
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas 110016, New Delhi, India
| | - Saswata Bhattacharya
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas 110016, New Delhi, India
| | - Pankaj Srivastava
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas 110016, New Delhi, India
| | - Santanu Ghosh
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas 110016, New Delhi, India
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28
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Ishizaki T, Yatsugi K, Akedo K. Effect of Particle Size on the Magnetic Properties of Ni Nanoparticles Synthesized with Trioctylphosphine as the Capping Agent. NANOMATERIALS 2016; 6:nano6090172. [PMID: 28335300 PMCID: PMC5224645 DOI: 10.3390/nano6090172] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 08/26/2016] [Accepted: 09/07/2016] [Indexed: 11/16/2022]
Abstract
Magnetic cores of passive components are required to have low hysteresis loss, which is dependent on the coercive force. Since it is well known that the coercive force becomes zero at the superparamagnetic regime below a certain critical size, we attempted to synthesize Ni nanoparticles in a size-controlled fashion and investigated the effect of particle size on the magnetic properties. Ni nanoparticles were synthesized by the reduction of Ni acetylacetonate in oleylamine at 220 °C with trioctylphosphine (TOP) as the capping agent. An increase in the TOP/Ni ratio resulted in the size decrease. We succeeded in synthesizing superparamagnetic Ni nanoparticles with almost zero coercive force at particle size below 20 nm by the TOP/Ni ratio of 0.8. However, the saturation magnetization values became smaller with decrease in the size. The saturation magnetizations of the Ni nanoparticles without capping layers were calculated based on the assumption that the interior atoms of the nanoparticles were magnetic, whereas the surface-oxidized atoms were non-magnetic. The measured and calculated saturation magnetization values decreased in approximately the same fashion as the TOP/Ni ratio increased, indicating that the decrease could be mainly attributed to increases in the amounts of capping layer and oxidized surface atoms.
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Affiliation(s)
| | - Kenichi Yatsugi
- Toyota Central R&D Labs., Inc., 41-1 Nagakute, Aichi 480-1192, Japan.
| | - Kunio Akedo
- Toyota Central R&D Labs., Inc., 41-1 Nagakute, Aichi 480-1192, Japan.
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29
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Ji JY, Shih PH, Chan TS, Ma YR, Wu SY. Magnetic Properties of Cluster Glassy Ni/NiO Core-Shell Nanoparticles: an Investigation of Their Static and Dynamic Magnetization. NANOSCALE RESEARCH LETTERS 2015; 10:925. [PMID: 26055474 PMCID: PMC4452478 DOI: 10.1186/s11671-015-0925-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Accepted: 05/08/2015] [Indexed: 05/14/2023]
Abstract
We review the phenomenology of the exchange bias and its related effects in core-shell nanocrystals. The static and dynamic properties of the magnetization for ferromagnetic Ni-core and antiferromagnetic NiO-shell cluster glassy nanoparticles are examined, along with the pinning-depinning process, through the measurement of the conventional exchange bias, and associated with different cooling fields and particle sizes. Two significant indexes for the dipolar interaction n and multi-anisotropic barrier β derived from the dynamic magnetization are proposed, which provide a unified picture of the exchange bias mechanism and insight into the influence of the cooling field.
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Affiliation(s)
- Jhong-Yi Ji
- />Department of Physics, National Dong Hwa University, Hualien, 97401 Taiwan
| | - Po-Hsun Shih
- />Department of Physics, National Dong Hwa University, Hualien, 97401 Taiwan
| | - Ting-Shan Chan
- />National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan
| | - Yuan-Ron Ma
- />Department of Physics, National Dong Hwa University, Hualien, 97401 Taiwan
| | - Sheng Yun Wu
- />Department of Physics, National Dong Hwa University, Hualien, 97401 Taiwan
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30
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Spadaro MC, D'Addato S, Luches P, Valeri S, Grillo V, Rotunno E, Roldan MA, Pennycook SJ, Ferretti AM, Capetti E, Ponti A. Tunability of exchange bias in Ni@NiO core-shell nanoparticles obtained by sequential layer deposition. NANOTECHNOLOGY 2015; 26:405704. [PMID: 26376605 DOI: 10.1088/0957-4484/26/40/405704] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Films of magnetic Ni@NiO core-shell nanoparticles (NPs, core diameter d ≅ 12 nm, nominal shell thickness variable between 0 and 6.5 nm) obtained with sequential layer deposition were investigated, to gain insight into the relationships between shell thickness/morphology, core-shell interface, and magnetic properties. Different values of NiO shell thickness t(s) could be obtained while keeping the Ni core size fixed, at variance with conventional oxidation procedures where the oxide shell is grown at the expense of the core. Chemical composition, morphology of the as-produced samples and structural features of the Ni/NiO interface were investigated with x-ray photoelectron spectroscopy and microscopy (scanning electron microscopy, transmission electron microscopy) techniques, and related with results from magnetic measurements obtained with a superconducting quantum interference device. The effect of the shell thickness on the magnetic properties could be studied. The exchange bias (EB) field H(bias) is small and almost constant for ts up to 1.6 nm; then it rapidly grows, with no sign of saturation. This behavior is clearly related to the morphology of the top NiO layer, and is mostly due to the thickness dependence of the NiO anisotropy constant. The ability to tune the EB effect by varying the thickness of the last NiO layer represents a step towards the rational design and synthesis of core-shell NPs with desired magnetic properties.
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Affiliation(s)
- Maria Chiara Spadaro
- CNR-NANO, via G. Campi 213/a, 41125 Modena, Italy. Dipartimento FIM, Università di Modena e Reggio Emilia, via G. Campi 213/a, 41125 Modena, Italy
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31
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De Toro JA, Marques DP, Muñiz P, Skumryev V, Sort J, Givord D, Nogués J. High Temperature Magnetic Stabilization of Cobalt Nanoparticles by an Antiferromagnetic Proximity Effect. PHYSICAL REVIEW LETTERS 2015; 115:057201. [PMID: 26274435 DOI: 10.1103/physrevlett.115.057201] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Indexed: 05/20/2023]
Abstract
Thermal activation tends to destroy the magnetic stability of small magnetic nanoparticles, with crucial implications for ultrahigh density recording among other applications. Here we demonstrate that low-blocking-temperature ferromagnetic (FM) Co nanoparticles (T(B)<70 K) become magnetically stable above 400 K when embedded in a high-Néel-temperature antiferromagnetic (AFM) NiO matrix. The origin of this remarkable T(B) enhancement is due to a magnetic proximity effect between a thin CoO shell (with low Néel temperature, T(N), and high anisotropy, K(AFM)) surrounding the Co nanoparticles and the NiO matrix (with high T(N) but low K(AFM)). This proximity effect yields an effective antiferromagnet with an apparent T(N) beyond that of bulk CoO, and an enhanced anisotropy compared to NiO. In turn, the Co core FM moment is stabilized against thermal fluctuations via core-shell exchange-bias coupling, leading to the observed T(B) increase. Mean-field calculations provide a semiquantitative understanding of this magnetic-proximity stabilization mechanism.
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Affiliation(s)
- José A De Toro
- Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada, Universidad de Castilla-La Mancha, E-13071 Ciudad Real, Spain
| | - Daniel P Marques
- Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada, Universidad de Castilla-La Mancha, E-13071 Ciudad Real, Spain
| | - Pablo Muñiz
- Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada, Universidad de Castilla-La Mancha, E-13071 Ciudad Real, Spain
| | - Vassil Skumryev
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
| | - Jordi Sort
- Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
| | - Dominique Givord
- Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France
- CNRS, Institut NEEL, F-38042 Grenoble, France
- Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941-972, Brasil
| | - Josep Nogués
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
- ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, E-08193 Bellaterra, Barcelona, Spain
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32
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Patange M, Biswas S, Yadav AK, Jha SN, Bhattacharyya D. Morphology-controlled synthesis of monodispersed graphitic carbon coated core/shell structured Ni/NiO nanoparticles with enhanced magnetoresistance. Phys Chem Chem Phys 2015; 17:32398-412. [DOI: 10.1039/c5cp05830a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Graphitic carbon coated core/shell structured Ni/NiO nanoparticles were synthesized by a sol–gel type chemical precursor method and their structural, morphological and magnetic properties were evaluated.
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Affiliation(s)
- M. Patange
- Department of Physics
- The LNM Institute of Information Technology
- Jaipur-302031
- India
| | - S. Biswas
- Department of Physics
- The LNM Institute of Information Technology
- Jaipur-302031
- India
| | - A. K. Yadav
- Applied Spectroscopy Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - S. N. Jha
- Applied Spectroscopy Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - D. Bhattacharyya
- Applied Spectroscopy Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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33
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Yun H, Liu X, Paik T, Palanisamy D, Kim J, Vogel WD, Viescas AJ, Chen J, Papaefthymiou GC, Kikkawa JM, Allen MG, Murray CB. Size- and composition-dependent radio frequency magnetic permeability of iron oxide nanocrystals. ACS NANO 2014; 8:12323-12337. [PMID: 25390073 DOI: 10.1021/nn504711g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigate the size- and composition-dependent ac magnetic permeability of superparamagnetic iron oxide nanocrystals for radio frequency (RF) applications. The nanocrystals are obtained through high-temperature decomposition synthesis, and their stoichiometry is determined by Mössbauer spectroscopy. Two sets of oxides are studied: (a) as-synthesized magnetite-rich and (b) aged maghemite nanocrystals. All nanocrystalline samples are confirmed to be in the superparamagnetic state at room temperature by SQUID magnetometry. Through the one-turn inductor method, the ac magnetic properties of the nanocrystalline oxides are characterized. In magnetite-rich iron oxide nanocrystals, size-dependent magnetic permeability is not observed, while maghemite iron oxide nanocrystals show clear size dependence. The inductance, resistance, and quality factor of hand-wound inductors with a superparamagnetic composite core are measured. The superparamagnetic nanocrystals are successfully embedded into hand-wound inductors to function as inductor cores.
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Affiliation(s)
- Hongseok Yun
- Department of Chemistry, ‡Department of Materials Science and Engineering, §Department of Electrical and Systems Engineering, and ⊥Department of Physics and Astronomy, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
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34
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Anderson BD, Tracy JB. Nanoparticle conversion chemistry: Kirkendall effect, galvanic exchange, and anion exchange. NANOSCALE 2014; 6:12195-216. [PMID: 25051257 DOI: 10.1039/c4nr02025a] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Conversion chemistry is a rapidly maturing field, where chemical conversion of template nanoparticles (NPs) into new compositions is often accompanied by morphological changes, such as void formation. The principles and examples of three major classes of conversion chemical reactions are reviewed: the Kirkendall effect for metal NPs, galvanic exchange, and anion exchange, each of which can result in void formation in NPs. These reactions can be used to obtain complex structures that may not be attainable by other methods. During each kind of conversion chemical reaction, NPs undergo distinct chemical and morphological changes, and insights into the mechanisms of these reactions will allow for improved fine control and prediction of the structures of intermediates and products. Conversion of metal NPs into oxides, phosphides, sulphides, and selenides often occurs through the Kirkendall effect, where outward diffusion of metal atoms from the core is faster than inward diffusion of reactive species, resulting in void formation. In galvanic exchange reactions, metal NPs react with noble metal salts, where a redox reaction favours reduction and deposition of the noble metal (alloying) and oxidation and dissolution of the template metal (dealloying). In anion exchange reactions, addition of certain kinds of anions to solutions containing metal compound NPs drives anion exchange, which often results in significant morphological changes due to the large size of anions compared to cations. Conversion chemistry thus allows for the formation of NPs with complex compositions and structures, for which numerous applications are anticipated arising from their novel catalytic, electronic, optical, magnetic, and electrochemical properties.
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Affiliation(s)
- Bryan D Anderson
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA.
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Zhang S, Gai S, He F, Dai Y, Gao P, Li L, Chen Y, Yang P. Uniform Ni/SiO2@Au magnetic hollow microspheres: rational design and excellent catalytic performance in 4-nitrophenol reduction. NANOSCALE 2014; 6:7025-7032. [PMID: 24841736 DOI: 10.1039/c4nr00338a] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A unique and rational design was presented to fabricate Ni/SiO2@Au magnetic hollow microspheres (MHMs) with interesting structures and well-dispersed metal nanoparticles. Hierarchical nickel silicate hollow microspheres were synthesized using silica colloidal spheres as a chemical template. Then, Ni/SiO2 MHMs with well-dispersed Ni nanoparticles were prepared via an in situ reduction approach. Ni/SiO2@Au MHMs were finally obtained by immobilizing uniform Au nanoparticles onto Ni/SiO2 support through a low-temperature chemical reduction process. It was found that Ni/SiO2@Au MHMs inherit the shape and uniformity of the original silica scaffold, and Ni NPs and Au NPs, which were less than 5 nm in size, were well dispersed on the mesoporous silica shell with narrow size distribution. Both Ni/SiO2 and Ni/SiO2@Au MHMs showed excellent catalytic activity in the 4-nitrophenol reduction reaction. Importantly, introduction of a small amount of Au NPs onto Ni/SiO2 MHMs markedly improved the catalytic activity. In particular, Ni/SiO2@Au MHMs showed high conversion even after re-use for several cycles with magnetic separation. The unique structure, high catalytic performance, and ease of separation make Ni/SiO2@Au MHMs highly promising candidates for diverse applications.
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Affiliation(s)
- Shenghuan Zhang
- College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China. yangpiaoping @ hrbeu.edu.cn
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36
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Fowlkes JD, Roberts NA, Wu Y, Diez JA, González AG, Hartnett C, Mahady K, Afkhami S, Kondic L, Rack PD. Hierarchical nanoparticle ensembles synthesized by liquid phase directed self-assembly. NANO LETTERS 2014; 14:774-782. [PMID: 24372258 DOI: 10.1021/nl404128d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A liquid metal filament supported on a dielectric substrate was directed to fragment into an ordered, mesoscale particle ensemble. Imposing an undulated surface perturbation on the filament forced the development of a single unstable mode from the otherwise disperse, multimodal Rayleigh-Plateau instability. The imposed mode paved the way for a hierarchical spatial fragmentation of the filament into particles, previously seen only at much larger scales. Ultimately, nanoparticle radius control is demonstrated using a micrometer scale switch.
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Affiliation(s)
- J D Fowlkes
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37381, United States
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37
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El-Shinawi H, Leichtweiß T, Peppler K, Müller MM, Kleebe HJ, Janek J. Synthesis and lithium storage properties of porous Li4/3Ti5/3O4-M/MOx (M=Ni,Co) composites. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.12.060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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38
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Rinaldi-Montes N, Gorria P, Martínez-Blanco D, Fuertes AB, Fernández Barquín L, Rodríguez Fernández J, de Pedro I, Fdez-Gubieda ML, Alonso J, Olivi L, Aquilanti G, Blanco JA. Interplay between microstructure and magnetism in NiO nanoparticles: breakdown of the antiferromagnetic order. NANOSCALE 2014; 6:457-465. [PMID: 24217131 DOI: 10.1039/c3nr03961g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The possibility of tuning the magnetic behaviour of nanostructured 3d transition metal oxides has opened up the path for extensive research activity in the nanoscale world. In this work we report on how the antiferromagnetism of a bulk material can be broken when reducing its size under a given threshold. We combined X-ray diffraction, high-resolution transmission electron microscopy, extended X-ray absorption fine structure and magnetic measurements in order to describe the influence of the microstructure and morphology on the magnetic behaviour of NiO nanoparticles (NPs) with sizes ranging from 2.5 to 9 nm. The present findings reveal that size effects induce surface spin frustration which competes with the expected antiferromagnetic (AFM) order, typical of bulk NiO, giving rise to a threshold size for the AFM phase to nucleate. Ni(2+) magnetic moments in 2.5 nm NPs seem to be in a spin glass (SG) state, whereas larger NPs are formed by an uncompensated AFM core with a net magnetic moment surrounded by a SG shell. The coupling at the core-shell interface leads to an exchange bias effect manifested at low temperature as horizontal shifts of the hysteresis loop (~1 kOe) and a coercivity enhancement (~0.2 kOe).
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Affiliation(s)
- N Rinaldi-Montes
- Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, Calvo Sotelo s/n, 33007, Oviedo, Spain.
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39
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Yao XJ, He XM, Song XY, Ding Q, Li ZW, Zhong W, Au CT, Du YW. Enhanced exchange bias and coercivity arising from heterojunctions in Ni–NiO nanocomposites. Phys Chem Chem Phys 2014; 16:6925-30. [DOI: 10.1039/c3cp55316g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Paredes-Garcia V, Cruz C, Toledo N, Denardin J, Venegas-Yazigi D, Castillo C, Spodine E, Luo Z. Effect of the different synthetic parameters on the morphology and magnetic properties of nickel nanoparticles. NEW J CHEM 2014. [DOI: 10.1039/c3nj01040f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The morphology of stable spherical Ni(0) nanoparticles can be modified to obtain flower-like Ni(0) arrangements by reheating them, retaining their high crystallinity and without oxidation of the nanoparticles.
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Affiliation(s)
- Veronica Paredes-Garcia
- Universidad Andres Bello
- Departamento de Ciencias Químicas
- Santiago, Chile
- Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA
- Chile
| | - Carlos Cruz
- Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA
- Chile
| | - Nestor Toledo
- Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA
- Chile
| | - Juliano Denardin
- Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA
- Chile
- Facultad de Ciencia
- Universidad de Santiago de Chile, USACH
- Chile
| | - Diego Venegas-Yazigi
- Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA
- Chile
- Facultad de Química y Biología
- Universidad de Santiago de Chile, USACH
- Chile
| | - Carolina Castillo
- Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA
- Chile
- Facultad de Ciencias Químicas y Farmacéuticas
- Universidad de Chile
- Chile
| | - Evgenia Spodine
- Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA
- Chile
- Facultad de Ciencias Químicas y Farmacéuticas
- Universidad de Chile
- Chile
| | - Zhiping Luo
- Microscopy and Imaging Center and Materials Science and Engineering Program
- Texas A&M University
- College Station, USA
- Department of Chemistry and Physics
- Fayetteville State University
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41
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Khurshid H, Li W, Chandra S, Phan MH, Hadjipanayis GC, Mukherjee P, Srikanth H. Mechanism and controlled growth of shape and size variant core/shell FeO/Fe3O4 nanoparticles. NANOSCALE 2013; 5:7942-52. [PMID: 23857290 DOI: 10.1039/c3nr02596a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We report a novel synthesis approach for the growth of core/shell FeO/Fe3O4 nanoparticles with controlled shape and size. FeO particles were partially oxidized to form core/shell FeO/Fe3O4 structures, as evidenced from transmission electron microscopy, X-ray diffraction, and magnetometry analysis. We find that the molar ratios and concentrations of surfactants are the key parameters in controlling the particle size. The particles can grow in either isotropic or anisotropic shapes, depending upon a chemical reaction scheme that is controlled kinetically or thermodynamically. The competitive growth rates of {111} and {100} facets can be used to tune the final shape of nanoparticles to spherical, cubic, octahedral, octopod, and cuboctahedral geometries. FeO particles can also be oxidized chemically or thermally to form Fe3O4 nanoparticles. By following the same synthesis technique, it is possible to synthesize rods and triangles of Fe3O4 by introducing twinnings and defects into the crystal structure of the seed. The thermally activated first-order Verwey transition at ~120 K has been observed in all the synthesized FeO/Fe3O4 nanoparticles, indicating its independence from the particle shape. These core/shell nanoparticles exhibit a strong shift in field-cooled hysteresis loops accompanied by an increase in coercivity (the so-called exchange bias effect), but the low field-switching behavior appears to vary with the particle shape.
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Affiliation(s)
- Hafsa Khurshid
- University of South Florida, Physics Department, Tampa, FL 33647, USA.
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42
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Medford JA, Johnston-Peck AC, Tracy JB. Nanostructural transformations during the reduction of hollow and porous nickel oxide nanoparticles. NANOSCALE 2013; 5:155-159. [PMID: 23168915 DOI: 10.1039/c2nr33005a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Size-dependent nanostructural transformations occurring during the H(2)-mediated reduction of hollow and porous NiO nanoparticles were investigated for controlled nanoparticle sizes of ~10 to 100 nm. Transmission electron microscopy reveals that the location and number of reduction sites strongly depend on the nanoparticle size and structure.
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Affiliation(s)
- John A Medford
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA
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43
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Huaman JLC, Hironaka N, Tanaka S, Shinoda K, Miyamura H, Jeyadevan B. Size-controlled monodispersed nickel nanocrystals using 2-octanol as reducing agent. CrystEngComm 2013. [DOI: 10.1039/c2ce26433a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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45
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Krommenhoek PJ, Wang J, Hentz N, Johnston-Peck AC, Kozek KA, Kalyuzhny G, Tracy JB. Bulky adamantanethiolate and cyclohexanethiolate ligands favor smaller gold nanoparticles with altered discrete sizes. ACS NANO 2012; 6:4903-11. [PMID: 22702463 DOI: 10.1021/nn3003778] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Use of bulky ligands (BLs) in the synthesis of metal nanoparticles (NPs) gives smaller core sizes, sharpens the size distribution, and alters the discrete sizes. For BLs, the highly curved surface of small NPs may facilitate growth, but as the size increases and the surface flattens, NP growth may terminate when the ligand monolayer blocks BLs from transporting metal atoms to the NP core. Batches of thiolate-stabilized Au NPs were synthesized using equimolar amounts of 1-adamantanethiol (AdSH), cyclohexanethiol (CySH), or n-hexanethiol (C6SH). The bulky CyS- and AdS-stabilized NPs have smaller, more monodisperse sizes than the C6S-stabilized NPs. As the bulkiness increases, the near-infrared luminescence intensity increases, which is characteristic of small Au NPs. Four new discrete sizes were measured by MALDI-TOF mass spectrometry, Au(30)(SAd)(18), Au(39)(SAd)(23), Au(65)(SCy)(30), and Au(67)(SCy)(30). No Au(25)(SAd)(18) was observed, which suggests that this structure would be too sterically crowded. Use of BLs may also lead to the discovery of new discrete sizes in other systems.
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Affiliation(s)
- Peter J Krommenhoek
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA
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46
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Bikshapathi M, Singh S, Bhaduri B, Mathur GN, Sharma A, Verma N. Fe-nanoparticles dispersed carbon micro and nanofibers: Surfactant-mediated preparation and application to the removal of gaseous VOCs. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.02.023] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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47
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48
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Jie Y, Niskala JR, Johnston-Peck AC, Krommenhoek PJ, Tracy JB, Fan H, You W. Laterally patterned magnetic nanoparticles. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c1jm14612b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Kalantari M, Kazemeini M, Tabandeh F, Arpanaei A. Lipase immobilisation on magnetic silica nanocomposite particles: effects of the silica structure on properties of the immobilised enzyme. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm30513e] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Abellán G, Latorre-Sánchez M, Fornés V, Ribera A, García H. Graphene as a carbon source effects the nanometallurgy of nickel in Ni,Mn layered double hydroxide–graphene oxide composites. Chem Commun (Camb) 2012; 48:11416-8. [DOI: 10.1039/c2cc35750j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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