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- W4320723306 abstract "Shape stability is key to avoiding degradation of performance for metallic nanocrystals synthesized with facetted non-equilibrium shapes to optimize properties for catalysis, plasmonics, and so on. Reshaping of facetted nanocrystals is controlled by the surface diffusion-mediated nucleation and growth of new outer layers of atoms. Kinetic Monte Carlo (KMC) simulation of a realistic stochastic atomistic-level model is applied to precisely track the reshaping of Pd octahedra and nanocubes. Unexpectedly, separate constrained equilibrium Monte Carlo analysis of the free energy profile during reshaping reveals a fundamental failure of the classical nucleation theory (CNT) prediction for the reshaping barrier and rate. Why? Nucleation barriers can be relatively low for these processes, so the system is not locally equilibrated before crossing the barrier, as assumed in CNT. This claim is supported by an analysis of a first-passage problem for reshaping within a master equation framework for the model that reasonably captures the behavior in KMC simulations." @default.
- W4320723306 created "2023-02-15" @default.
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- W4320723306 date "2023-03-08" @default.
- W4320723306 modified "2023-09-29" @default.
- W4320723306 title "Nucleation-mediated reshaping of facetted metallic nanocrystals: Breakdown of the classical free energy picture" @default.
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- W4320723306 doi "https://doi.org/10.1063/5.0138266" @default.
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