Journal Article FZJ-2018-07624

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Near wall dynamics of a spherical particle in crowded suspensions of colloidal rods – dynamic information from TIRM revisited

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2018
Royal Soc. of Chemistry London

Soft matter 14(45), 9232 - 9242 () [10.1039/C8SM01541D]

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Abstract: We preformed total internal reflection microscopy (TIRM) experiments to determine the depletion potentials between probe spheres and a flat glass wall, which are induced by rod shaped fd-virus. In addition to the measurement of static potentials, we extracted dynamic information from the same raw data in three different ways, i. e. by determining the spatially averaged diffusion constant of the probe sphere normal to the wall, by measuring the position dependence of the diffusion coefficient and by measuring the position dependence of the particle's drift velocity. We find that the dependence of the depletion potential amplitude and the spatially averaged diffusion constant show an intriguingly similar dependence on the rod concentration, which indicates that the observed deviation of the static results from the classical Asakura--Oosawa description may be caused by a retarded relaxation of the rod network. Upon analyzing the spatially resolved dynamics we further observe, that local particle drift velocities can be measured much more reliably than local diffusion coefficients.

Classification:

Contributing Institute(s):
  1. Weiche Materie (ICS-3)
Research Program(s):
  1. 551 - Functional Macromolecules and Complexes (POF3-551) (POF3-551)
  2. ESMI - European Soft Matter Infrastructure (262348) (262348)

Appears in the scientific report 2018
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Medline ; Creative Commons Attribution CC BY 3.0 ; OpenAccess ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; National-Konsortium ; NationallizenzNationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection
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 Record created 2018-12-19, last modified 2021-01-30