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5 October 2023 Out-of-equilibrium coupling of colloidal particles with critical baths
Ignacio A. Martinez, Sergio Ciliberto, Kristiaan Neyts
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Proceedings Volume PC12649, Optical Trapping and Optical Micromanipulation XX; PC1264911 (2023) https://doi.org/10.1117/12.2681173
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
A liquid mixture close to its critical demixing point is a perfect example of critical bath where the thermal fluctuations are enhanced and can be tuned by slight changes in the temperature. Although studied in equilibrium by micromanipulation techniques, with results going from Casimir-like forces or the effect of the increasing correlation length in bacterial motility, very little has been done out of equilibrium. Here, we will present our results on the relaxation dynamics of optically trapped particles coupled to critical baths. Our experiments have the novelty of using local laser induced heating for producing temperature quenches. We report on the microrheology of the critical fluid at different critical distances as well as in the relaxation of critical Casimir forces after temperature or distance quenches.
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Ignacio A. Martinez, Sergio Ciliberto, and Kristiaan Neyts "Out-of-equilibrium coupling of colloidal particles with critical baths", Proc. SPIE PC12649, Optical Trapping and Optical Micromanipulation XX, PC1264911 (5 October 2023); https://doi.org/10.1117/12.2681173
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KEYWORDS
Particles
Mixtures
Colloids
Design and modelling
Liquids
Modulation
Nanostructures
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