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Nelli D, El Koraychy EY, Cerbelaud M, Crespin B, Videcoq A, Giacomello A, Ferrando R. Two-Steps Versus One-Step Solidification Pathways of Binary Metallic Nanodroplets. ACS NANO 2023; 17:587-596. [PMID: 36537367 PMCID: PMC9836354 DOI: 10.1021/acsnano.2c09741] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
The solidification of AgCo, AgNi, and AgCu nanodroplets is studied by molecular dynamics simulations in the size range of 2-8 nm. All these systems tend to phase separate in the bulk solid with surface segregation of Ag. Despite these similarities, the simulations reveal clear differences in the solidification pathways. AgCo and AgNi already separate in the liquid phase, and they solidify in configurations close to equilibrium. They can show a two-step solidification process in which Co-/Ni-rich parts solidify at higher temperatures than the Ag-rich part. AgCu does not separate in the liquid and solidifies in one step, thereby remaining in a kinetically trapped state down to room temperature. The solidification mechanisms and the size dependence of the solidification temperatures are analyzed, finding qualitatively different behaviors in AgCo/AgNi compared to AgCu. These differences are rationalized by an analytical model.
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Affiliation(s)
- Diana Nelli
- Dipartimento
di Fisica, Università di Genova, Via Dodecaneso 33, 16146Genova, Italia
| | - El Yakout El Koraychy
- Dipartimento
di Fisica, Università di Genova, Via Dodecaneso 33, 16146Genova, Italia
| | | | - Benoit Crespin
- Université
de Limoges, CNRS, XLIM/ASALI, F-87000Limoges, France
| | - Arnaud Videcoq
- Université
de Limoges, CNRS, IRCER, UMR 7315, F-87000Limoges, France
| | - Alberto Giacomello
- Dipartimento
di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, via Eudossiana 18, 00184Roma, Italia
| | - Riccardo Ferrando
- Dipartimento
di Fisica, Università di Genova, Via Dodecaneso 33, 16146Genova, Italia
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Eidani M, Akbarzadeh H, Mehrjouei E, Abbaspour M, Salemi S, Yaghoubi H. Thermal Stability and Melting Mechanism of Diamond Nanothreads: Insight from Molecular Dynamics Simulation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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G J, Varatharaj R, J MD. Influence of elemental composition on structural, thermal and hydration behavior of gold-silver bimetallic nanoparticles. J Mol Model 2022; 28:53. [PMID: 35113278 DOI: 10.1007/s00894-022-05025-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 01/03/2022] [Indexed: 11/30/2022]
Abstract
In this study, molecular dynamics simulations (MDs) have been employed to explore the influence of elemental composition on the structural, thermal, and hydration behavior of the core-shell gold-silver bimetallic nanoparticles with three different concentrations Au135Ag114, Au87Ag162, and Au55Ag194. The pure gold and silver metal nanoparticles have also been studied for the sake of comparison. The calculated cohesive and formation energy values reveal the enhancement in the stability of gold-silver bimetallic nanoparticles with the increase in the concentration of gold. The specific heat capacity value of the bimetallic gold-silver nanoparticles has been found to increase linearly with the concentration of silver. This suggests that the specific heat capacity value of the gold-silver bimetallic nanoparticles may be improved by raising their silver concentration. The enhancement of specific heat capacity value with respect to the concentration of silver may be attributed to the enhanced phonon density. There is no significant difference in the computed hydration shell and water residence time of the gold-silver bimetallic nanoparticles with respect to their mixing ratio. The obtained stable structure, tunable specific heat capacity values, and the predicted hydration properties of the gold-silver bimetallic nanoparticles may be harnessed for their technological and biological applications.
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Affiliation(s)
- Jayabalaji G
- Centre for Nanotechnology and Advanced Biomaterials (CeNTAB), Department of Physics, School of Electrical and Electronics Engineering (SEEE), SASTRA Deemed University, Thanjavur, 613401, Tamil Nadu, India
| | - Rajapandian Varatharaj
- Department of Chemistry, Sri Ramakrishna Mission Vidyalaya, College of Arts and Science, Coimbatore, 641020, Tamil Nadu, India
| | - Meena Devi J
- Centre for Nanotechnology and Advanced Biomaterials (CeNTAB), Department of Physics, School of Electrical and Electronics Engineering (SEEE), SASTRA Deemed University, Thanjavur, 613401, Tamil Nadu, India.
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Cezar HM, Rondina GG, Da Silva JLF. Thermodynamic properties of 55-atom Pt-based nanoalloys: Phase changes and structural effects on the electronic properties. J Chem Phys 2019; 151:204301. [DOI: 10.1063/1.5125689] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Henrique M. Cezar
- Institute of Physics, University of São Paulo, 05508-090, São Paulo, SP, Brazil
| | - Gustavo G. Rondina
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Juarez L. F. Da Silva
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, 13560-970, São Carlos, SP, Brazil
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A comparative study of graphite and CNT supported Au-Ag, Au-Pd, Au-Pt and Au-Rh nanoalloys using MD simulation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.02.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Akbarzadeh H, Abbaspour M, Mehrjouei E. Competition between stability of icosahedral and cuboctahedral morphologies in bimetallic nanoalloys. Phys Chem Chem Phys 2018; 19:14659-14670. [PMID: 28537621 DOI: 10.1039/c7cp01081h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we investigated the heating process for pure (Rh55 and Cu55), single dopant (Rh1Cu54 and Rh54Cu), core@shell (Rh13@Cu42 and Cu13@Rh42), and alloy (Rh13Cu42, Rh42Cu13) nanoclusters in two structures (cuboctahedral and icosahedral) from 0 to 2000 K using molecular dynamics (MD) simulations. Our aim was to investigate the effects of composition and chemical arrangement on the kinetic and thermodynamic stability of Rh-Cu bimetallic nanoalloys. Our results indicated that Cu55, Ir55, Rh1Cu54, Rh54Cu, and Cu13@Rh42 in the cuboctahedral and icosahedral structures and Rh42Cu13 in the icosahedral structure did not experience any transformation with the exception of melting. It was also observed that the cuboctahedral Rh42Cu13 shows a solid-solid transformation to the icosahedral structure before the melting point. It is also observed that Rh13@Cu42 and Rh13Cu42 nanoclusters in both structures exhibit a transition to a pseudo-spherical structure before the melting point. Our results also illustrated that the Rh and Cu atoms tend to lie in the inner and outer shells of the nanoclusters, respectively. We have also discussed the changes in the melting points of the doped nanoclusters in the different arrangements.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran.
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Akbarzadeh H, Abbaspour M, Mehrjouei E. Phase transition in crown-jewel structured Au-Ir nanoalloys with different shapes: a molecular dynamics study. Phys Chem Chem Phys 2018; 18:25676-25686. [PMID: 27711431 DOI: 10.1039/c6cp04218j] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have studied the melting process for crown-jewel structured Ir55, Ir54Au, Ir43Au12, Ir25Au30, Ir13Au42, and Au55 nanoclusters in the icosahedral, Ir55, Ir54Au, Ir43Au12, Ir19Au36, Ir13Au42, and Au55 nanoclusters in the cuboctahedral, and Ir54, Ir53Au, Ir47Au7, Ir17Au37, Ir7Au47, and Au54 nanoclusters in the decahedral morphologies. We have investigated the different thermodynamic, structural, and dynamical properties for the different nanoclusters in the different structures. Our thermodynamic results indicated that as the concentration of Au atoms in the nanoclusters increases, the absolute value of internal energy, and so the melting points, of the nanoclusters decrease. It is also shown that the Au atoms decrease the melting temperature of the pure cuboctahedral cluster more than that of the other structures. We have also found that the Au atoms were located in favorable positions at the surface sites of nanoalloys. Also, the doping of the Ir nanocluster by Au atoms makes the cluster more stable. It is also found that nanoclusters with different morphologies have almost the same stability. Our structural results indicated that after the melting process, the Au atoms generally tend to lie in the outer shell of the cluster, but the Ir atoms generally tend to lie in the core of the cluster (see the Ir13Au42 and Ir7Au47 nanoclusters, for example). We have also found the interesting result that the Ir7Au47 nanocluster shows a solid-solid transition from a decahedral structure to an icosahedral structure before melting. The Ir43Au12 nanocluster also shows a transformation from a cuboctahedral structure to an icosahedral-like structure before melting. Our dynamical results showed that doping of the Ir55 cluster with an Au atom sharply increases the self-diffusion coefficient in the initial state in the solid phase, especially in icosahedral and cuboctahedral structures. It is also shown that the Ir13Au42 cluster in icosahedral and cuboctahedral and the Ir7Au47 and Ir17Au37 clusters in decahedral morphologies have smaller values of self-diffusion coefficients than other clusters after the melting point and that this could be due to the formation of core-shell structures.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran.
| | - Mohsen Abbaspour
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran.
| | - Esmat Mehrjouei
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran.
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Effect of systematic addition of the third component on the melting characteristics and structural evolution of binary alloy nanoclusters. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.11.075] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Akbarzadeh H, Abbaspour M, Mehrjouei E. Au@Pt and Pt@Au nanoalloys in the icosahedral and cuboctahedral structures: Which is more stable? J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.07.096] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Different morphologies of aluminum nanoclusters: Effect of pressure on solid-liquid phase transition of the nanoclusters using molecular dynamics simulations. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.12.117] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Akbarzadeh H, Abbaspour M, Mehrjouei E. Investigation of thermal, structural and dynamical properties of (Aux–Cuy–Niy)N=32,108,256 ternary nanosystems: effect of Au addition to Cu–Ni bimetallic nanoclusters via MD simulation. RSC Adv 2016. [DOI: 10.1039/c6ra13057g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work, we have investigated the heating and cooling processes for ternary metallic nanoclusters with different Au mole fractions using molecular dynamics simulation.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Mohsen Abbaspour
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Esmat Mehrjouei
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
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