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Front A, Mottet C. Stress effect on segregation and ordering in Pt-Ag nanoalloys. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:154006. [PMID: 33503601 DOI: 10.1088/1361-648x/abe07a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
We performed a theoretical study of the chemical ordering and surface segregation of Pt-Ag nanoalloys in the range of size from 976 to 9879 atoms (3.12 to 6.76 nm). We used an original many-body potential able to stabilize the L11ordered phase at equiconcentration leading to a strong silver surface segregation. Based on a recent experimental study where nanoparticles up to 2.5 nm have been characterized by high transmission electron microscopy with the L11ordered phase in the core and a silver surface shell, we predict in our model via Monte Carlo simulations that the lower energy configuration is more complicated with a three-shell alternance of Ag/Pt/Ag from the surface surrounding the L11ordered phase in the core. The stress analysis demonstrates that this structure softens the local stress distribution inside the nanoparticle which contributes to reduce the internal energy.
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Affiliation(s)
- Alexis Front
- Aix-Marseille University, CNRS, CINaM UMR 7325, Campus de Luminy, Marseille 13288, France
| | - Christine Mottet
- Aix-Marseille University, CNRS, CINaM UMR 7325, Campus de Luminy, Marseille 13288, France
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2
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Cerbelaud M, Tran CT, Ferrando R, Crespin B, Videcoq A. Interdiffusion and crystallization of oppositely charged colloids. Phys Chem Chem Phys 2017; 19:31094-31102. [DOI: 10.1039/c7cp05872a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Innovative way of controlling colloidal heteroaggregation.
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Affiliation(s)
| | | | - Riccardo Ferrando
- Dipartimento di Chimica e Chimica Industriale and CNR-IMEM
- via Dodecaneso 31
- 16146, Genova
- Italy
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3
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Laganapan A, Bochicchio D, Bienia M, Videcoq A, Ferrando R. Aggregation of binary colloidal suspensions on attractive walls. Phys Chem Chem Phys 2016; 18:3073-9. [PMID: 26739745 DOI: 10.1039/c5cp07050c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption of colloidal particles from a suspension on a solid surface is of fundamental importance to many physical and biological systems. In this work, Brownian Dynamics simulations are performed to study the aggregation in a suspension of oppositely charged colloidal particles in the presence of an attractive wall. For sufficiently strong attractions, the wall alters the microstructure of the aggregates so that B2 (CsCl-type) structures are more likely obtained instead of B1 (NaCl-type) structures. The probability of forming either B1 or B2 crystallites depends also on the inverse interaction range κa. Suspensions with small κa are more likely to form B2 crystals than suspensions with larger κa, even if the energetic stability of the B2 phase decreases with decreasing κa. The mechanisms underlying this aggregation and crystallization behaviour are analyzed in detail.
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Affiliation(s)
- Aleena Laganapan
- SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France and Dipartimento di Fisica, via Dodecaneso 33, 16146, Genova, Italy
| | | | - Marguerite Bienia
- SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - Arnaud Videcoq
- SPCTS, UMR 7315, ENSCI, CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - Riccardo Ferrando
- Dipartimento di Chimica e Chimica Industriale and CNR-IMEM, via Dodecaneso 31, 16146, Genova, Italy.
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4
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Araya-Hermosilla E, Orellana SL, Toncelli C, Picchioni F, Moreno-Villoslada I. Novel polyketones with pendant imidazolium groups as nanodispersants of hydrophobic antibiotics. J Appl Polym Sci 2015. [DOI: 10.1002/app.42363] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Esteban Araya-Hermosilla
- Instituto de Ciencias Químicas; Facultad de Ciencias; Universidad Austral de Chile; Casilla 567 Valdivia Chile
- Department of Chemical Engineering/Product technology; University of Groningen; Nijenborgh 4 9747AG Groningen The Netherlands
| | - Sandra L. Orellana
- Instituto de Ciencias Químicas; Facultad de Ciencias; Universidad Austral de Chile; Casilla 567 Valdivia Chile
| | - Claudio Toncelli
- Department of Chemical Engineering/Product technology; University of Groningen; Nijenborgh 4 9747AG Groningen The Netherlands
| | - Francesco Picchioni
- Department of Chemical Engineering/Product technology; University of Groningen; Nijenborgh 4 9747AG Groningen The Netherlands
| | - Ignacio Moreno-Villoslada
- Instituto de Ciencias Químicas; Facultad de Ciencias; Universidad Austral de Chile; Casilla 567 Valdivia Chile
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Sue ACH, Mannige RV, Deng H, Cao D, Wang C, Gándara F, Stoddart JF, Whitelam S, Yaghi OM. Heterogeneity of functional groups in a metal-organic framework displays magic number ratios. Proc Natl Acad Sci U S A 2015; 112:5591-6. [PMID: 25901326 PMCID: PMC4426423 DOI: 10.1073/pnas.1416417112] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Multiple organic functionalities can now be apportioned into nanoscale domains within a metal-coordinated framework, posing the following question: how do we control the resulting combination of "heterogeneity and order"? Here, we report the creation of a metal-organic framework, MOF-2000, whose two component types are incorporated in a 2:1 ratio, even when the ratio of component types in the starting solution is varied by an order of magnitude. Statistical mechanical modeling suggests that this robust 2:1 ratio has a nonequilibrium origin, resulting from kinetic trapping of component types during framework growth. Our simulations show how other "magic number" ratios of components can be obtained by modulating the topology of a framework and the noncovalent interactions between component types, a finding that may aid the rational design of functional multicomponent materials.
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Affiliation(s)
- Andrew C-H Sue
- Department of Chemistry, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, CA 94720; Department of Chemistry, Northwestern University, Evanston, IL 60201
| | - Ranjan V Mannige
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720; and
| | - Hexiang Deng
- Department of Chemistry, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Dennis Cao
- Department of Chemistry, Northwestern University, Evanston, IL 60201
| | - Cheng Wang
- Department of Chemistry, Northwestern University, Evanston, IL 60201
| | - Felipe Gándara
- Department of Chemistry, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - J Fraser Stoddart
- Department of Chemistry, Northwestern University, Evanston, IL 60201;
| | - Stephen Whitelam
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720; and
| | - Omar M Yaghi
- Department of Chemistry, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, CA 94720; Kavli Energy NanoScience Institute, Berkeley, CA 94720
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6
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Bochicchio D, Videcoq A, Ferrando R. Study of the B1-B2 transition in colloidal clusters. J Chem Phys 2014; 140:024911. [PMID: 24437915 DOI: 10.1063/1.4861049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The possible mechanisms for the B1 (NaCl-type) to B2 (CsCl-type) transition in crystalline colloidal clusters of equally sized particles are studied by means of two computational techniques: metadynamics and nudged elastic band calculations. The system is modelled by a screened Coulomb potential. Different interaction ranges are considered. The transition from a perfect NaCl cubic cluster to a full CsCl cluster is forced by metadynamics, revealing a transition path with intermediate metastable configurations in which planes are shifted one by one. The presence of metastable configurations in the transition path, corresponding to a certain number of NaCl planes turned into CsCl, has clear analogies with the known Hyde and O'Keeffe mechanism for ionic crystals, with some important differences due to finite-size effects. These comprise the fact that the transition starts by shifting a surface plane by means of a row-by-row mechanism that has no analog in bulk crystals. The energy barriers between the local minima in the transition path are calculated, showing that the barriers strongly depend on the screening length, in such a way that the B1 metastable phase can have very long lifetimes when the interaction is sufficiently long-ranged.
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Affiliation(s)
- D Bochicchio
- Dipartimento di Fisica and CNR-IMEM, Via Dodecaneso 33, Genova I-16146, Italy
| | - A Videcoq
- SPCTS, UMR 7315, ENSCI, CNRS, Centre Europeéen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - R Ferrando
- Dipartimento di Fisica and CNR-IMEM, Via Dodecaneso 33, Genova I-16146, Italy
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Tomilov A, Videcoq A, Cerbelaud M, Piechowiak MA, Chartier T, Ala-Nissila T, Bochicchio D, Ferrando R. Aggregation in Colloidal Suspensions: Evaluation of the Role of Hydrodynamic Interactions by Means of Numerical Simulations. J Phys Chem B 2013; 117:14509-17. [DOI: 10.1021/jp407247y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Tomilov
- SPCTS, UMR 7315,
ENSCI, CNRS; Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - A. Videcoq
- SPCTS, UMR 7315,
ENSCI, CNRS; Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - M. Cerbelaud
- Institut
des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière, BP32229, 44322 Nantes cedex 3, France
| | - M. A. Piechowiak
- SPCTS, UMR 7315,
ENSCI, CNRS; Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - T. Chartier
- SPCTS, UMR 7315,
ENSCI, CNRS; Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges cedex, France
| | - T. Ala-Nissila
- Department
of Applied Physics and COMP CoE, Aalto University School of Science, P.O. Box 11000, FI-00076 Aalto, Espoo, Finland
- Department
of Physics, Brown University, Providence, Rhode Island 02912-8143, United States
| | - D. Bochicchio
- Dipartimento
di
Fisica and CNR-IMEM, Via Dodecaneso
33, Genova I-16146, Italy
| | - R. Ferrando
- Dipartimento
di
Fisica and CNR-IMEM, Via Dodecaneso
33, Genova I-16146, Italy
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