Probing single particle diffusion in the binary solvents close to its critical poin
We propose to study the particle diffusion in a near-critical binary solvent with a focus to test the validity of the well-known Stokes-Einstein relationship. Both theories and our SANS measurements indicate that near a critical demixing temperature, an adsorbed layer can be formed on colloidal particle surface. For the much larger particles, it is well established that the Stokes-Einstein relationship should hold. However, it is unclear if this is true when the thickness of the adsorption layer, the correlation length of the solvent density fluctuation, and the particle diameters are comparable to each other. Therefore, we would like to directly measure the particle diffusion using neutron spin echo. By using contrast variation technique, the neutron scattering intensity from the solvent fluctuation can be completely suppressed so that NSE can reliably measure the particle diffusion to provide critical information to test the validity of the Stokes-Einstein relationship.
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LIU Yun; FALUS Peter; Jannatun Nayem and PORCAR Lionel. (2015). Probing single particle diffusion in the binary solvents close to its critical poin. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1403
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