Publication date: 22nd July 2026
Although sessile drop experiments provide important information about solid-liquid interactions in processing environments, the energy of solid-solid interfaces and their influence on adhesion and charge transfer are of central importance in many materials applications. These relationships are often complicated by capillarity-driven deviations from ideal flat-facet geometries, as well as by changes in interfacial energy caused by the adsorption (Gibbsian segregation) of dopants and/or impurities. In parallel, measurement of free surface energy as a function of dopant adsorption is critical for understanding the equilibrium morphology of metal particles supported on ceramic substrates.
This presentation will explore an experimental approach based on solid-state equilibration of thin films on defined substrates (so called solid-state dewetting) coupled with aberration-corrected microscopy to measure interfacial and surface energies while simultaneously resolving the atomistic structure and local chemistry of catalyst systems. The combination of these methods enables a direct connection between equilibrium particle shape, interface structure, and composition, providing a pathway to understand how capillarity, segregation, and adsorption collectively control adhesion and charge-transfer phenomena. Two approaches to measure the equilibrium crystal shape, and thus the relative surface energy of facets, will be explored. Examples from catalyst-support systems will be discussed to illustrate how nanoscale interfacial energetics can be quantified and related to functional materials behavior
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