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Critical Casimir interactions of colloids in micellar critical solutions

Critical Casimir interactions of colloids in micellar critical solutions

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HELDEN, Laurent, Timo KNIPPENBERG, Li TIAN, Aubin ARCHAMBAULT, Felix GINOT, Clemens BECHINGER, 2021. Critical Casimir interactions of colloids in micellar critical solutions. In: Soft Matter. Royal Society of Chemistry (RSC). 17(10). ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/d0sm02021d

@article{Helden2021-03-18Criti-52787, title={Critical Casimir interactions of colloids in micellar critical solutions}, year={2021}, doi={10.1039/d0sm02021d}, number={10}, volume={17}, issn={1744-683X}, journal={Soft Matter}, author={Helden, Laurent and Knippenberg, Timo and Tian, Li and Archambault, Aubin and Ginot, Felix and Bechinger, Clemens} }

Helden, Laurent Tian, Li Ginot, Felix Helden, Laurent 2021-02-10T09:59:45Z Bechinger, Clemens 2021-02-10T09:59:45Z Knippenberg, Timo We study the temperature-dependence of critical Casimir interactions in a critical micellar solution of the nonionic surfactant C<sub>12</sub>E<sub>5</sub> 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. Critical Casimir interactions of colloids in micellar critical solutions Ginot, Felix 2021-03-18 Archambault, Aubin eng Bechinger, Clemens terms-of-use Knippenberg, Timo Tian, Li Archambault, Aubin

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