1
|
Phan AT, Gheribi AE, Chartrand P. Coherent phase equilibria of systems with large lattice mismatch. Phys Chem Chem Phys 2019; 21:10808-10822. [PMID: 31086918 DOI: 10.1039/c9cp01272a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In many metallurgical applications, an accurate knowledge of miscibility gaps and spinodal decompositions is highly desirable. Some binary systems where the main constituents of the same crystal structures have similar lattice parameters (less than 15% difference) reveal a composition, temperature shift of the miscibility gap due to lattice coherency. So far, the well-known Cahn's approach is the only available calculation method to estimate the coherent solid state phase equilibria. Nevertheless, this approach shows some limitations, in particular it fails to predict accurately the evolution of phase equilibria for large deformation, i.e. the large lattice parameter difference (more than 5%). The aim of this study is to propose an alternative approach to overcome the limits of Cahn's method. The elastic contribution to the Gibbs energy, representing the elastic energy stored in the coherent boundary, is formulated based on the linear elasticity theory. The expression of the molar elastic energy corresponding to the coherency along both directions [100] and [111] has been formulated in the small and large deformation regimes. Several case studies have been examined in cubic systems, and the proposed formalism is showing an appropriate predictive capability, making it a serious alternative to the Cahn's method. The present formulation is applied to predict phase equilibria evolution of systems under other stresses rather than only those induced by the lattice mismatch.
Collapse
Affiliation(s)
- Anh Thu Phan
- CRCT - Center for Research in Computational Thermochemistry, Department of Chemical Eng., Polytechnique Montréal (Campus de Université de Montréal), Box 6079, Station Downtown, Montréal, Québec H3C 3A7, Canada.
| | - Aïmen E Gheribi
- CRCT - Center for Research in Computational Thermochemistry, Department of Chemical Eng., Polytechnique Montréal (Campus de Université de Montréal), Box 6079, Station Downtown, Montréal, Québec H3C 3A7, Canada.
| | - Patrice Chartrand
- CRCT - Center for Research in Computational Thermochemistry, Department of Chemical Eng., Polytechnique Montréal (Campus de Université de Montréal), Box 6079, Station Downtown, Montréal, Québec H3C 3A7, Canada.
| |
Collapse
|
2
|
Kim JW, Kovalenko O, Liu Y, Bigot JY. Exploring the Angstrom Excursion of Au Nanoparticles Excited away from a Metal Surface by an Impulsive Acoustic Perturbation. ACS NANO 2016; 10:10880-10886. [PMID: 28024387 DOI: 10.1021/acsnano.6b05196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the anharmonic angstrom dynamics of self-assembled Au nanoparticles (Au:NPs) away from a nickel surface on top of which they are coupled by their near-field interaction. The deformation and the oscillatory excursion away from the surface are induced by picosecond acoustic pulses and probed at the surface plasmon resonance with femtosecond laser pulses. The overall dynamics are due to an efficient transfer of translational momentum from the Ni surface to the Au:NPs, therefore avoiding usual thermal effects and energy redistribution among the electronic states. Two modes are clearly revealed by the oscillatory shift of the Au:NPs surface plasmon resonance-the quadrupole deformation mode due to the transient ellipsoid shape and the excursion mode when the Au:NPs bounce away from the surface. We find that, contrary to the quadrupole mode, the excursion mode is sensitive to the distance between Au:NPs and Ni. Importantly, the excursion dynamics display a nonsinusoidal motion that cannot be explained by a standard harmonic potential model. A detailed modeling of the dynamics using a Hamaker-type Lennard-Jones potential between two media is performed, showing that each Au:NPs coherently evolves in a nearly one-dimensional anharmonic potential with a total excursion of ∼1 Å. This excursion induces a shift of the surface plasmon resonance detectable because of the strong near-field interaction. This general method of observing the spatiotemporal dynamics with angstrom and picosecond resolutions can be directly transposed to many nanostructures or biosystems to reveal the interaction and contact mechanism with their surrounding medium while remaining in their fundamental electronic states.
Collapse
Affiliation(s)
- Ji-Wan Kim
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, Université de Strasbourg , BP 43, 23 rue du Loess, Strasbourg 67034 Cedex 02, France
| | - Oleksandr Kovalenko
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, Université de Strasbourg , BP 43, 23 rue du Loess, Strasbourg 67034 Cedex 02, France
| | - Yu Liu
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, Université de Strasbourg , BP 43, 23 rue du Loess, Strasbourg 67034 Cedex 02, France
| | - Jean-Yves Bigot
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, Université de Strasbourg , BP 43, 23 rue du Loess, Strasbourg 67034 Cedex 02, France
| |
Collapse
|
3
|
Abstract
It is well-believed that below a certain particle size, grain boundary-mediated plastic deformation (e.g., grain rotation, grain boundary sliding and diffusion) substitutes for conventional dislocation nucleation and motion as the dominant deformation mechanism. However, in situ probing of grain boundary processes of ultrafine nanocrystals during plastic deformation has not been feasible, precluding the direct exploration of the nanomechanics. Here we present the in situ texturing observation of bulk-sized platinum in a nickel pressure medium of various particle sizes from 500 nm down to 3 nm. Surprisingly, the texture strength of the same-sized platinum drops rapidly with decreasing grain size of the nickel medium, indicating that more active grain rotation occurs in the smaller nickel nanocrystals. Insight into these processes provides a better understanding of the plastic deformation of nanomaterials in a few-nanometer length scale.
Collapse
|
4
|
Chen B, Lutker K, Raju SV, Yan J, Kanitpanyacharoen W, Lei J, Yang S, Wenk HR, Mao HK, Williams Q. Texture of Nanocrystalline Nickel: Probing the Lower Size Limit of Dislocation Activity. Science 2012; 338:1448-51. [DOI: 10.1126/science.1228211] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Bin Chen
- Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
- Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Katie Lutker
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Selva Vennila Raju
- Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
- Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
- Department of Physics, University of Nevada, Las Vegas, NV 89119, USA
| | - Jinyuan Yan
- Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
- Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | | | - Jialin Lei
- Louisiana Optical Network Initiative (LONI) Institute, Southern University, Baton Rouge, LA 70813, USA
| | - Shizhong Yang
- Louisiana Optical Network Initiative (LONI) Institute, Southern University, Baton Rouge, LA 70813, USA
| | - Hans-Rudolf Wenk
- Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Ho-kwang Mao
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Quentin Williams
- Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| |
Collapse
|
5
|
Ojeda OU, Çağın T. Hydrogen Bonding and Molecular Rearrangement in 1,3,5-Triamino-2,4,6-trinitrobenzene under Compression. J Phys Chem B 2011; 115:12085-93. [DOI: 10.1021/jp2007649] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Oscar U. Ojeda
- Laboratory of Computational Engineering of Nanomaterials, Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843-3122, United States
| | - Tahir Çağın
- Laboratory of Computational Engineering of Nanomaterials, Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843-3122, United States
| |
Collapse
|
6
|
Diaz JAC, Cağin T. Thermo-mechanical stability and strength of peptide nanostructures from molecular dynamics: self-assembled cyclic peptide nanotubes. NANOTECHNOLOGY 2010; 21:115703. [PMID: 20173235 DOI: 10.1088/0957-4484/21/11/115703] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Peptide nanostructures present a wide range of opportunities for applications in biomedicine and bionanotechnology; hence experimental and theoretical studies aiming at determination of thermo-mechanical stability of peptide-based nanostructures are critical for the design and development of their technological applications. Here, we present a homogeneous deformation method combined with the finite elasticity theory and molecular dynamics simulations (MD) for the calculation of second-order anisotropic elastic constants for a membrane model made up of self-assembled cyclic peptide nanotubes. We have computed the values of all anisotropic elastic constants at 300 K. The value of the engineering Young's modulus (in the z direction) is 19.6 GPa. We observed a yield behavior in the z direction for a strain value of 6%. Furthermore, we also report calculated heat capacity, thermal expansion coefficient and isothermal compressibility of the system under study.
Collapse
|