What is it about?

In this work I show that for liquid binary mixtures confined on a sphere one can define a single (scalar) quantity that reflects the mixing state of the fluid and that can be computed once the structure of the confined mixture is known. I call this parameter geodesic mixing parameter. I show that such a quantity is useful to characterize the effect of bulk particle adsorption on the mixing state of the fluid. Void formation is also investigated under different conditions. I find that large void formation is suppressed when large fluctuating domains characterize the fluid structure.

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Why is it important?

My work points out that studying mixing-demixing transition on a sphere gives the (unique) possibility to define a quantity that tells "in one shot" which is the mixing state of a multi-component fluid, It opens then a new route to investigate confined mixtures under different physico-chemical conditions and offers a new perspective for the analysis of structural data in membranes, armored bubbles, pickering emulsions and other systems of physical interest.

Perspectives

Further studies, based on the same model, will elucidate more in detail the role played by mixture composition, temperature, and bulk particle concentration on the fluid behavior, and how the geodesic mixing parameter can be used to characterize the structure of confined fluids in real systems. I hope that my results can pave the way for more targeted experiments to investigate the role of complex molecules and particles on the mixing state of quasi-2D liquids.

Domenico Truzzolillo
Laboratoire Charles Coulomb, Montpellier

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This page is a summary of: Mixing-demixing transition and void formation in quasi-2D binary mixtures on a sphere, The Journal of Chemical Physics, January 2022, American Institute of Physics, DOI: 10.1063/5.0080352.
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