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Bazán-Díaz L, Pérez A, Bogireddy NKR, Velázquez-Salazar JJ, Betancourt I, José-Yacamán M, Herrera-Becerra R, Mendoza-Cruz R. PDDA induced step-pyramidal growth of nickel-platinum (Ni-Pt) nanoparticles for enhanced 4-nitrophenol reduction. Chem Commun (Camb) 2023. [PMID: 37157896 DOI: 10.1039/d3cc00791j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Herein, we report the synthesis of novel platinum-based nanoparticles with step-pyramidal growth induced by poly(diallyldimethylammonium chloride) (PDDA). The complex stepped pyramidal shape became the central point for outstanding catalytic reduction of 4-nitrophenol, overcoming the activity of bare Pt nanoparticles. These results are valuable for the catalytic degradation of reactive molecules.
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Affiliation(s)
- Lourdes Bazán-Díaz
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico.
| | - Ariadna Pérez
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico.
| | - Naveen Kumar Reddy Bogireddy
- Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Circuito de la Investigación Científica, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico
| | - J Jesús Velázquez-Salazar
- Applied Physics and Materials Science Department and Center for Material Interfaces Research and Applications (MIRA), Northern Arizona University, Flagstaff, AZ, 86011, USA
| | - Israel Betancourt
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico.
| | - Miguel José-Yacamán
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico.
- Applied Physics and Materials Science Department and Center for Material Interfaces Research and Applications (MIRA), Northern Arizona University, Flagstaff, AZ, 86011, USA
| | - Raúl Herrera-Becerra
- Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Circuito de la Investigación Científica, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico
| | - Rubén Mendoza-Cruz
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, Ciudad de Mexico, 04510, Mexico.
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2
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Manzorro R, Xu Y, Vincent JL, Rivera R, Matteson DS, Crozier PA. Exploring Blob Detection to Determine Atomic Column Positions and Intensities in Time-Resolved TEM Images with Ultra-Low Signal-to-Noise. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2022; 28:1-14. [PMID: 35343415 DOI: 10.1017/s1431927622000356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Spatially resolved in situ transmission electron microscopy (TEM), equipped with direct electron detection systems, is a suitable technique to record information about the atom-scale dynamics with millisecond temporal resolution from materials. However, characterizing dynamics or fluxional behavior requires processing short time exposure images which usually have severely degraded signal-to-noise ratios. The poor signal-to-noise associated with high temporal resolution makes it challenging to determine the position and intensity of atomic columns in materials undergoing structural dynamics. To address this challenge, we propose a noise-robust, processing approach based on blob detection, which has been previously established for identifying objects in images in the community of computer vision. In particular, a blob detection algorithm has been tailored to deal with noisy TEM image series from nanoparticle systems. In the presence of high noise content, our blob detection approach is demonstrated to outperform the results of other algorithms, enabling the determination of atomic column position and its intensity with a higher degree of precision.
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Affiliation(s)
- Ramon Manzorro
- School for the Engineering of Matter, Transport, and Energy, Arizona State University, Engineering G Wing #301, 501 E Tyler Mall, Tempe, AZ85287, USA
| | - Yuchen Xu
- Department of Statistics and Data Science, Cornell University, Ithaca, NY, USA
| | - Joshua L Vincent
- School for the Engineering of Matter, Transport, and Energy, Arizona State University, Engineering G Wing #301, 501 E Tyler Mall, Tempe, AZ85287, USA
| | - Roberto Rivera
- Department of Mathematical Sciences, University of Puerto Rico-Mayaguez, Mayaguez, Puerto Rico
| | - David S Matteson
- Department of Statistics and Data Science, Cornell University, Ithaca, NY, USA
| | - Peter A Crozier
- School for the Engineering of Matter, Transport, and Energy, Arizona State University, Engineering G Wing #301, 501 E Tyler Mall, Tempe, AZ85287, USA
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3
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Ke YH, Wang X, Li JY, Liu H, Yuan H. Selective Oxidation of Glycerol to Lactic Acid over Supported Bimetallic Au–M Catalysts. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024421150139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Uetake Y, Mouri S, Haesuwannakij S, Okumura K, Sakurai H. Volcano-type correlation between particle size and catalytic activity on hydrodechlorination catalyzed by AuPd nanoalloy. NANOSCALE ADVANCES 2021; 3:1496-1501. [PMID: 36132860 PMCID: PMC9417458 DOI: 10.1039/d0na00951b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/18/2021] [Indexed: 06/16/2023]
Abstract
Although changing the size of metal nanoparticles (NPs) is a reasonable way to tune and/or enhance their catalytic activity, size-selective preparation of NPs possessing random-alloy morphology has been challenging because of the differences in the ionization potential of each metal ion. This study demonstrates a time-controlled aggregation-stabilization method for the size-selective preparation of random alloy NPs composed of Au and Pd, which are stabilized by poly(N-vinyl-2-pyrrolidone) (PVP). By adjusting the mixing time in the presence of a small amount of PVP, aggregation was induced to produce AuPd:PVP with sizes ranging between 1.2 and 8.2 nm at approximately 1 nm intervals. Transmission electron microscopy (TEM), powder X-ray diffraction (PXRD), and extended X-ray absorption fine structure (EXAFS) analyses indicated the formation of various sizes of AuPd nanoalloys, and size-dependent catalytic activity was observed when hydrodechlorination of 4-chloroanisole was performed using 2-propanol as a reducing agent. AuPd:PVP with a size of 3.1 nm exhibited the highest catalytic activity. A comparison of the absorption edges of X-ray absorption near edge structure (XANES) spectra suggested that the electronic state of the Au and Pd species correlated with their catalytic activity, presumably affecting the rate-determining step.
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Affiliation(s)
- Yuta Uetake
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Sachi Mouri
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Setsiri Haesuwannakij
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Kazu Okumura
- Department of Applied Chemistry, Faculty of Engineering, Kogakuin University 2665-1 Nakano-machi Hachioji Tokyo 192-0015 Japan
| | - Hidehiro Sakurai
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
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5
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Santoveña-Uribe A, Maya-Cornejo J, Bahena D, Ledesma J, Pérez R, Esparza R. Synthesis and Characterization of AgPd Bimetallic Nanoparticles as Efficient Electrocatalysts for Oxygen Reduction Reaction. Electrocatalysis (N Y) 2020. [DOI: 10.1007/s12678-020-00613-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Holade Y, Hebié S, Maximova K, Sentis M, Delaporte P, Kokoh KB, Napporn TW, Kabashin AV. Bare laser-synthesized palladium–gold alloy nanoparticles as efficient electrocatalysts for glucose oxidation for energy conversion applications. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01323d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Laser-synthesized PdAu nanoparticles demonstrate a strong synergetic effect on glucose oxidation combining high catalytic activity with ultrafast kinetics at low potentials.
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Affiliation(s)
- Yaovi Holade
- Université de Poitiers
- IC2MP UMR 7285 CNRS
- 86073 Poitiers Cedex 9
- France
| | - Seydou Hebié
- Université de Poitiers
- IC2MP UMR 7285 CNRS
- 86073 Poitiers Cedex 9
- France
| | - Ksenia Maximova
- Aix Marseille University
- CNRS, LP3 UMR 7341
- Marseille cedex 9
- France
| | - Marc Sentis
- Aix Marseille University
- CNRS, LP3 UMR 7341
- Marseille cedex 9
- France
- MEPhI
| | | | | | - Teko W. Napporn
- Université de Poitiers
- IC2MP UMR 7285 CNRS
- 86073 Poitiers Cedex 9
- France
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7
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Au-Pd alloy nanoparticles catalyze the colorimetric detection of hydrazine with methylene blue. INORG CHEM COMMUN 2019. [DOI: 10.1016/j.inoche.2019.107455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Tofighi G, Yu X, Lichtenberg H, Doronkin DE, Wang W, Wöll C, Wang Y, Grunwaldt JD. Chemical Nature of Microfluidically Synthesized AuPd Nanoalloys Supported on TiO2. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00161] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Ghazal Tofighi
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
| | | | - Henning Lichtenberg
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
| | - Dmitry E. Doronkin
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
| | | | | | | | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany
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9
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Rani P, Kumar A, Vishwanadh B, Ali K, Arya A, Tewari R, Subramaniam A. Liquid like nucleation in free-standing nanoscale films. NANOSCALE 2017; 9:12283-12287. [PMID: 28703820 DOI: 10.1039/c7nr03225k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The concept of a critical nucleus size (r*) is of pivotal importance in phase transformations involving nucleation and growth. The current investigation pertains to crystallization in nanoscale thin films and study of the same using high resolution lattice fringe imaging (HRLFI) and finite element simulations. Using the CuZrAl bulk metallic glass system as a model system for this study, we demonstrate a liquid like nucleation behaviour in nanoscale free-standing films upon heating. The r* for the formation of the Cu10Zr7 phase in thin films (of decreasing thickness) approaches that of the r* for the formation of the crystal from a liquid (i.e.). Working in the nucleation dominant regime, we introduce the concept of 'depth sensitive lattice fringe imaging'. The thickness of the film is determined by electron energy loss spectroscopy and the strain energy of the system is computed using finite element computations.
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Affiliation(s)
- Pooja Rani
- Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India.
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10
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Mendoza-Cruz R, Bazán-Diaz L, Velázquez-Salazar JJ, Samaniego-Benitez JE, Ascencio-Aguirre FM, Herrera-Becerra R, José-Yacamán M, Guisbiers G. Order-disorder phase transitions in Au-Cu nanocubes: from nano-thermodynamics to synthesis. NANOSCALE 2017; 9:9267-9274. [PMID: 28561093 DOI: 10.1039/c7nr00028f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Catalysts have been widely used in industries and can be optimized by tuning the composition and chemical ordering of the elements involved in the nano-alloy. Among bi-metallic alloys, the Au-Cu system is of particular interest because it exhibits ordered phases at low temperatures. Nevertheless, the temperature at which these ordered structures are formed is totally unknown at the nanoscale. Consequently, to speed up the development of these catalysts, this paper theoretically predicts the structural phase transitions between ordered and disordered phases for the Au-Cu system by using nano-thermodynamics. Following the predictions, the suggested annealing temperatures have been carefully chosen and consequently, Au-Cu ordered nanocubes have been successfully synthesized through a solventless protocol. The results are fully supported by electron microscopy observations.
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Affiliation(s)
- R Mendoza-Cruz
- Department of Physics & Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
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11
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LIU Z, EPICIER T, LEFKIR Y, VITRANT G, DESTOUCHES N. HAADF-STEM characterization and simulation of nanoparticle distributions in an inhomogeneous matrix. J Microsc 2017; 266:60-68. [DOI: 10.1111/jmi.12519] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 11/03/2016] [Accepted: 12/07/2016] [Indexed: 01/19/2023]
Affiliation(s)
- Z. LIU
- Univ Lyon, UJM-Saint-Etienne, CNRS; Institut d'Optique Graduate School, Laboratoire Hubert Curien UMR 5516; F-42023 Saint-Etienne France
| | - T. EPICIER
- MATEIS, UMR 5510 CNRS; Université de Lyon; INSA-Lyon Villeurbanne France
| | - Y. LEFKIR
- Univ Lyon, UJM-Saint-Etienne, CNRS; Institut d'Optique Graduate School, Laboratoire Hubert Curien UMR 5516; F-42023 Saint-Etienne France
| | - G. VITRANT
- IMEP-LAHC, Minatec; Grenoble-INP; CNRS-UMR 5130 Grenoble France
| | - N. DESTOUCHES
- Univ Lyon, UJM-Saint-Etienne, CNRS; Institut d'Optique Graduate School, Laboratoire Hubert Curien UMR 5516; F-42023 Saint-Etienne France
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12
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Savara A, Chan-Thaw CE, Sutton JE, Wang D, Prati L, Villa A. Molecular Origin of the Selectivity Differences between Palladium and Gold-Palladium in Benzyl Alcohol Oxidation: Different Oxygen Adsorption Properties. ChemCatChem 2016. [DOI: 10.1002/cctc.201601295] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Aditya Savara
- Chemical Sciences Division; Oak Ridge National Laboratory Institution; 1 Bethel Valley Road MS 6201 Oak Ridge TN 37831 USA
| | - Carine E. Chan-Thaw
- Dipartimento di Chimica; Università degli Studi di Milano; via Golgi 19 20133 Milano Italy
| | - Jonathan E. Sutton
- Chemical Sciences Division; Oak Ridge National Laboratory Institution; 1 Bethel Valley Road MS 6201 Oak Ridge TN 37831 USA
| | - Di Wang
- Institute of Nanotechnology and Karlsruhe Nano Micro Facility; Karlsruhe Institute of Technology; Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Laura Prati
- Dipartimento di Chimica; Università degli Studi di Milano; via Golgi 19 20133 Milano Italy
| | - Alberto Villa
- Dipartimento di Chimica; Università degli Studi di Milano; via Golgi 19 20133 Milano Italy
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13
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Parri MC, Qiu Y, Walther T. New pathways for improved quantification of energy-dispersive X-ray spectra of semiconductors with multiple X-ray lines from thin foils investigated in transmission electron microscopy. J Microsc 2016; 260:427-41. [PMID: 26769195 DOI: 10.1111/jmi.12345] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 09/28/2015] [Indexed: 11/29/2022]
Abstract
Theoretical approaches to quantify the chemical composition of bulk and thin-layer specimens using energy-dispersive X-ray spectroscopy in a transmission electron microscope are compared to experiments investigating (In)GaAs and Si(Ge) semiconductors. Absorption correctors can be improved by varying the take-off angle to determine the depth of features within the foil or the samples thickness, or by definition of effective k-factors that can be obtained from plots of k-factors versus foil thickness or, preferably, versus the K/L intensity ratio for a suitable element. The latter procedure yields plots of self-consistent absorption corrections that can be used to determine the chemical composition, iteratively for SiGe using a set of calibration curves or directly from a single calibration curve for InGaAs, for single X-ray spectra without knowledge of sample thickness, density or mass absorption coefficients.
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Affiliation(s)
- M C Parri
- Department of Electronic & Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK
| | - Y Qiu
- Department of Electronic & Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK.,now at: IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
| | - T Walther
- Department of Electronic & Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK
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14
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Marr KM, Chen B, Mootz EJ, Geder J, Pruessner M, Melde BJ, Vanfleet RR, Medintz IL, Iverson BD, Claussen JC. High Aspect Ratio Carbon Nanotube Membranes Decorated with Pt Nanoparticle Urchins for Micro Underwater Vehicle Propulsion via H2O2 Decomposition. ACS NANO 2015; 9:7791-7803. [PMID: 26106943 DOI: 10.1021/acsnano.5b02124] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The utility of unmanned micro underwater vehicles (MUVs) is paramount for exploring confined spaces, but their spatial agility is often impaired when maneuvers require burst-propulsion. Herein we develop high-aspect ratio (150:1), multiwalled carbon nanotube microarray membranes (CNT-MMs) for propulsive, MUV thrust generation by the decomposition of hydrogen peroxide (H2O2). The CNT-MMs are grown via chemical vapor deposition with diamond shaped pores (nominal diagonal dimensions of 4.5 × 9.0 μm) and subsequently decorated with urchin-like, platinum (Pt) nanoparticles via a facile, electroless, chemical deposition process. The Pt-CNT-MMs display robust, high catalytic ability with an effective activation energy of 26.96 kJ mol(-1) capable of producing a thrust of 0.209 ± 0.049 N from 50% [w/w] H2O2 decomposition within a compact reaction chamber of eight Pt-CNT-MMs in series.
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Affiliation(s)
- Kevin M Marr
- Department of Mechanical Engineering, Brigham Young University , 435 Crabtree, Provo, Utah 84602, United States
| | - Bolin Chen
- Department of Mechanical Engineering, Iowa State University , 2104 Black Engineering, Ames, Iowa 50011, United States
| | - Eric J Mootz
- Department of Mechanical Engineering, Iowa State University , 2104 Black Engineering, Ames, Iowa 50011, United States
| | - Jason Geder
- U.S. Naval Research Laboratory , 4555 Overlook Avenue SW, Washington, D.C. 20375, United States
| | - Marius Pruessner
- U.S. Naval Research Laboratory , 4555 Overlook Avenue SW, Washington, D.C. 20375, United States
| | - Brian J Melde
- U.S. Naval Research Laboratory , 4555 Overlook Avenue SW, Washington, D.C. 20375, United States
| | - Richard R Vanfleet
- Department of Physics and Astronomy, Brigham Young University , N283 Eyring Science Center, Provo, Utah 84602, United States
| | - Igor L Medintz
- U.S. Naval Research Laboratory , 4555 Overlook Avenue SW, Washington, D.C. 20375, United States
| | - Brian D Iverson
- Department of Mechanical Engineering, Brigham Young University , 435 Crabtree, Provo, Utah 84602, United States
| | - Jonathan C Claussen
- Department of Mechanical Engineering, Iowa State University , 2104 Black Engineering, Ames, Iowa 50011, United States
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15
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Su DS, Zhang B, Schlögl R. Electron microscopy of solid catalysts--transforming from a challenge to a toolbox. Chem Rev 2015; 115:2818-82. [PMID: 25826447 DOI: 10.1021/cr500084c] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Dang Sheng Su
- †Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.,‡Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Bingsen Zhang
- †Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Robert Schlögl
- ‡Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
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16
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Sun Z, Zhao Q, Zhang G, Li Y, Zhang G, Zhang F, Fan X. Exfoliated MoS2 supported Au–Pd bimetallic nanoparticles with core–shell structures and superior peroxidase-like activities. RSC Adv 2015. [DOI: 10.1039/c4ra13575j] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The preparation of Au–Pd/MoS2 hybrids and evolutions of absorbance spectra changes at 652 nm with different Au–Pd mass ratios.
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Affiliation(s)
- Zhen Sun
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering & Technology
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin University
- Tianjin
| | - Qingshan Zhao
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering & Technology
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin University
- Tianjin
| | - Guanghui Zhang
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering & Technology
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin University
- Tianjin
| | - Yang Li
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering & Technology
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin University
- Tianjin
| | - Guoliang Zhang
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering & Technology
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin University
- Tianjin
| | - Fengbao Zhang
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering & Technology
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin University
- Tianjin
| | - Xiaobin Fan
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering & Technology
- Collaborative Innovation Center of Chemical Science and Engineering
- Tianjin University
- Tianjin
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17
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Kumar M, Deka S. Multiply twinned AgNi alloy nanoparticles as highly active catalyst for multiple reduction and degradation reactions. ACS APPLIED MATERIALS & INTERFACES 2014; 6:16071-81. [PMID: 25171089 DOI: 10.1021/am503913y] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Size dependent surface characteristics of nanoparticles lead to use of these nanomaterials in many technologically important fields, including the field of catalysis. Here Ag(1-x)Ni(x) bimetallic alloy nanoparticles have been developed having a 5-fold twinned morphology, which could be considered as an important alloy because of their excellent and unique catalytic and magnetic properties. Alloying between Ag and Ni atoms on a nanoscale has been confirmed with detailed X-ray diffraction, high resolution transmission electron microscopy, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, and magnetization measurements. Although introduced for the first time as a catalyst due to having high active surface sites, the as-synthesized nanoparticles showed one of the best multiple catalytic activity in the industrially important (electro)-catalytic reduction of 4-nitrophenol (4-NP) and 4-nitroaniline (4-NA) to corresponding amines with noticeable reduced reaction time and increased rate constant without the use of any large area support. Additionally the same catalyst showed enhanced catalytic activity in degradation of environment polluting dye molecules. The highest ever activity parameter we report here for Ag0.6Ni0.4 composition is 156 s(-1)g(-1) with an apparent rate constant of 31.1 × 10(-3) s(-1) in a 4-NP reduction reaction where the amount of catalyst used was 0.2 mg and the time taken for complete conversion of 4-NP to 4-aminophenol was 60 s. Similarly, an incredible reaction rate constant (115 s(-1)) and activity parameter (576.6 s(-1)g(-1)) were observed for the catalytic degradation of methyl orange dye where 15 s is the maximum time for complete degradation of the dye molecules. The high catalytic performance of present AgNi alloy NPs over the other catalysts has been attributed to size, structural (twinned defect) and electronic effects. This study may lead to use of these bimetallic nanostructures with excellent recyclable catalytic efficiency in many more applications.
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Affiliation(s)
- Mukesh Kumar
- Department of Chemistry, University of Delhi, North Campus , Delhi 110007, India
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18
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Zhang QL, Feng JX, Wang AJ, Wei J, Feng JJ. Simple synthesis of bimetallic alloyed Pd–Au nanochain networks supported on reduced graphene oxide for enhanced oxygen reduction reaction. RSC Adv 2014. [DOI: 10.1039/c4ra10746b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A simple and rapid wet-chemical co-reduction method was developed for synthesis of alloyed Pd–Au nanochain networks supported on RGO, with the assistance of caffeine as a capping agent and a structure directing agent.
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Affiliation(s)
- Qian-Li Zhang
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
- School of Chemistry and Biological Engineering
| | - Jin-Xia Feng
- School of Chemistry and Biological Engineering
- Suzhou University of Science and Technology
- Suzhou, China
| | - Ai-Jun Wang
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
| | - Jie Wei
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
| | - Jiu-Ju Feng
- College of Chemistry and Life Science
- College of Geography and Environmental Science
- Zhejiang Normal University
- Jinhua 321004, China
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Grunwaldt JD, Wagner JB, Dunin-Borkowski RE. Imaging Catalysts at Work: A Hierarchical Approach from the Macro- to the Meso- and Nano-scale. ChemCatChem 2012. [DOI: 10.1002/cctc.201200356] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Larios E, Calderón L, Guerrero K, Pinedo E, Maldonado A, Tanori J. Synthesis of Core-Shell (Pd-Au) Bimetallic Nanoparticles in Microemulsions. J DISPER SCI TECHNOL 2012. [DOI: 10.1080/01932690903294147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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A novel procedure for accurate estimations of the lattice parameter of supported nanoparticles from the analysis of plan view HREM images: Application to the structural investigation of Pd/CeO2 catalysts. Catal Today 2012. [DOI: 10.1016/j.cattod.2011.04.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Min C, Zou H, Wang J. Experimental study of lattice distortion in ellipsoid-like nano-crystallites of copper. Micron 2011; 42:826-32. [PMID: 21680191 DOI: 10.1016/j.micron.2011.05.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2011] [Revised: 05/20/2011] [Accepted: 05/20/2011] [Indexed: 11/28/2022]
Abstract
The elastic state of embedded inclusions is of considerable importance to the properties of materials. The non-uniform lattice distortion in the inclusions in which the interfaces are shaped with variable curvature cannot be measured by usual experimental methods. In this paper, the lattice distortions in an ellipsoid-like nano-crystallite of copper were measured by means of the peak finding method in the central part of the HRTEM image. The effects of contrast delocalization are studied by HRTEM image simulations, which show that the measured spacings of peaks in the middle part of the crystallite can be considered approximately equal to the true spacings of columns. With the HRTEM method, our measured results show that the nano-crystallite is expanded in the short axis direction and compressed in the long axis direction. The results calculated with the elasticity theory incorporating interface tension consist with the experimental results of HRTEM.
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Affiliation(s)
- Changping Min
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China
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23
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Kozina V, Geist D, Kubinová L, Bilić E, Karnthaler HP, Waitz T, Janáček J, Chernyavskiy O, Krhen I, Ježek D. Visualization of Reinke's crystals in normal and cryptorchid testis. Histochem Cell Biol 2011; 135:215-28. [PMID: 21287192 DOI: 10.1007/s00418-011-0782-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/14/2011] [Indexed: 01/21/2023]
Abstract
Within the human testis, Reinke's crystals are found in Leydig cells but their nature and function are poorly understood. The aim of our study was to investigate the properties of Reinke's crystals in man with the normal morphology of the testis (control group) and infertile patients diagnosed with cryptorchidism. 20 biopsies from infertile patients and six biopsies from men with regular spermatogenesis (20-30 years.) were used. Sections of the testis tissue were stained with haematoxylin and eosin and a modified Masson's method. Specimens were observed by bright field, confocal and transmission electron microscopy (TEM). The number of Reinke's crystals in investigated groups was determined applying stereological methods. In both groups, Reinke's crystals were noted within the cytoplasm and nuclei of Leydig cells. Some "free" crystals were found within the interstitial space, outside Leydig cells. Confocal microscopy proved to be very useful in the assessment of the shape and 3D reconstruction of the crystal. TEM analysis confirmed a hexagonal form of the crystal, while crystallographic data on sections of 70-300 nm thickness provided a better insight into the organization of the crystal lattice. Stereological analysis revealed a significant increase in the number of crystals in cryptorchid testes when compared with controls. Increased number of crystals in cryptorchid specimens leads to the assumption that the prolonged exposure to higher (abdominal) temperature might stimulate enzymes involved in the synthesis of the proteins of the crystal. However, the exact molecular nature of the crystal lattice remains in both normal and cryptorchid testis obscure.
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Affiliation(s)
- Viviana Kozina
- Department of Histology and Embryology, School of Medicine, University of Zagreb, Šalata 3, 10000 Zagreb, Croatia
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24
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Shen Y, Zhang S, Li H, Ren Y, Liu H. Efficient Synthesis of Lactic Acid by Aerobic Oxidation of Glycerol on Au-Pt/TiO2 Catalysts. Chemistry 2010; 16:7368-71. [DOI: 10.1002/chem.201000740] [Citation(s) in RCA: 194] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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26
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Oleshko VP. Aperiodic core structures of Pd and Pt giant clusters chemically stabilized with diphenyl phosphide ligands. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2005.12.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Garcia-Gutierrez DI, Gutierrez-Wing CE, Giovanetti L, Ramallo-López JM, Requejo FG, Jose-Yacaman M. Temperature Effect on the Synthesis of Au−Pt Bimetallic Nanoparticles. J Phys Chem B 2005; 109:3813-21. [PMID: 16851430 DOI: 10.1021/jp048114a] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pt-Au bimetallic nanoparticles have been synthesized by the polyol method and stabilized with poly(vinylpyrrolidone) (PVP), modifying the temperature of synthesis. Interesting structure changes were observed in the nanoparticles as the temperature was varied. At lower temperatures no bimetallic nanoparticles were detected, but as the temperature increased bimetallic nanoparticles started to appear, commonly obtaining core-shell nanoparticles, always covered by the polymer. This originates the modification of the optical response of the system in the UV-visible region. An absorption peak centered at 520 nm at low temperatures was observed (100-110 degrees C); at higher temperatures (130-170 degrees C) there were non detectable absorption peaks, and finally at the two highest temperatures (180-190 degrees C) the reappearance of an absorption feature centered at 510 nm was noticed. These UV-visible results indirectly imply the composition of the surface of the particle. The structure of the particles has been determined using transmission electron microscopy and high-angle annular dark field (HAADF), the latter being a powerful technique to determine the structural composition of the particles and allowing a direct correlation of the optical response with their structural composition. X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) studies were also performed on the samples and their results support the idea of a Pt(core)-Au(shell) structure with the elements segregated from each other. The combination of these experimental techniques with calculated UV-vis absorption spectra allowed, in a reliable way, the elucidation of the nanoparticles structure and elemental distribution.
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Affiliation(s)
- Domingo I Garcia-Gutierrez
- The Texas Materials Institute, The University of Texas at Austin, 1 University Station C2201, Building ETC, Room 8.102, Austin, Texas 78712-1063, USA
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28
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Cowley JM. Applications of electron nanodiffraction. Micron 2004; 35:345-60. [PMID: 15006361 DOI: 10.1016/j.micron.2003.12.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2003] [Revised: 12/15/2003] [Accepted: 12/16/2003] [Indexed: 10/26/2022]
Abstract
Diffraction patterns from regions 1 nm or less in diameter may be recorded in scanning transmission electron microscopy instruments, and have been applied to the investigation of the structures of various nanoparticles, including catalysts, ferrihydrite and ferritins. Applications to nanotubes and related materials and near-amorphous thin films are reported. The coherence of the incident beams may be exploited in studies of crystals and their defects. Several schemes are outlined whereby the information from sequences of nanodiffraction patterns may be combined to provide ultra-high resolution in electron microscope imaging.
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Affiliation(s)
- J M Cowley
- Department of Physics and Astronomy, Arizona State University, P.O. Box 871504, Tempe, AZ 85187-1504, USA.
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29
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Liu J. Advanced electron microscopy characterization of nanostructured heterogeneous catalysts. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2004; 10:55-76. [PMID: 15306068 DOI: 10.1017/s1431927604040310] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2003] [Indexed: 05/24/2023]
Abstract
Heterogeneous catalysis is one of the oldest nanosciences. Although model catalysts can be designed, synthesized, and, to a certain degree, characterized, industrial heterogeneous catalysts are often chemically and physically complex systems that have been developed through many years of catalytic art, technology, and science. The preparation of commercial catalysts is generally not well controlled and is often based on accumulated experiences. Catalyst characterization is thus critical to developing new catalysts with better activity, selectivity, and/or stability. Advanced electron microscopy, among many characterization techniques, can provide useful information for the fundamental understanding of heterogeneous catalysis and for guiding the development of industrial catalysts. In this article, we discuss the recent developments in applying advanced electron microscopy techniques to characterizing model and industrial heterogeneous catalysts. The importance of understanding the catalyst nanostructure and the challenges and opportunities of advanced electron microscopy in developing nanostructured catalysts are also discussed.
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Affiliation(s)
- Jingyue Liu
- Science & Technology, Monsanto Company, 800 N. Lindbergh Blvd., U1E, St. Louis, Missouri 63167, USA.
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