Publikation: Critical Casimir interactions of colloids in micellar critical solutions
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We study the temperature-dependence of critical Casimir interactions in a critical micellar solution of the nonionic surfactant C12E5 dissolved in water. Experimentally, this is achieved with total internal reflection microscopy (TIRM) which measures the interaction between a single particle and a flat wall. For comparison, we also studied the pair interactions of a two dimensional layer of colloidal particles in the identical micellar system which yields good agreement with the TIRM results. Although, at the surfactant concentration considered here, the fluid forms a dynamical network of wormlike micelles whose structure is considerably more complex than that of simple critical molecular fluids, the temperature-dependence of the measured interactions is - for surface-to-surface distances above 160 nm - in excellent quantitative agreement with theory. Below 160 nm, deviations arise which we attribute to the adsorption of micelles to the interacting surfaces.
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HELDEN, Laurent, Timo KNIPPENBERG, Li TIAN, Aubin ARCHAMBAULT, Félix GINOT, Clemens BECHINGER, 2021. Critical Casimir interactions of colloids in micellar critical solutions. In: Soft Matter. Royal Society of Chemistry (RSC). 2021, 17(10), pp. 2737-2741. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/d0sm02021dBibTex
@article{Helden2021-03-18Criti-52787, year={2021}, doi={10.1039/d0sm02021d}, title={Critical Casimir interactions of colloids in micellar critical solutions}, number={10}, volume={17}, issn={1744-683X}, journal={Soft Matter}, pages={2737--2741}, author={Helden, Laurent and Knippenberg, Timo and Tian, Li and Archambault, Aubin and Ginot, Félix and Bechinger, Clemens} }
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