Work

Adsorbate phase transitions on nanoclusters from nested sampling

Year: 2025

Type: article

Abstract: Nested sampling was employed to investigate adsorption equilibria on the truncated-octahedral Lennard-Jones (LJ) nanocluster LJ38 (also commonly denoted TO38) while systematically varying adsorbate-surface well depth and LJ size parameters. Evaluation of the canonical partition function over a wide temperature range identifies two successive phase transitions: (i) condensation of the gas phase onto the cluster surface at higher temperatures and (ii) lateral rearrangement of the adsorbed layer at lower temperatures. For identical interactions, the condensate first populates both three- and fourfold hollow sites; when adsorbate-adsorbate interactions are weakened, preference shifts to the four-coordinated (100) sites. Size mismatch governs low-temperature behavior: smaller adsorbates aggregate to increase mutual contacts, whereas larger ones distribute more evenly to maximize coordination with the cluster. These findings highlight key trends in facet competition and lattice mismatch and showcase nested sampling as an automated, unbiased tool for exploring surface configurational space and guiding investigations of more complex, realistic interfaces.

Source: The Journal of Chemical Physics

DOI: 10.1063/5.0283538

Authors: Thanawitch Chatbipho, Ray Yang, Robert B. Wexler, Livia B. Pártay

Institutions: University of Warwick, Washington University in St. Louis

Language: English

Topic: nanoparticles nucleation surface interactions

Subfield: Atmospheric Science

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,500