Diffusiophoresis of latex driven by anionic nanoparticles and their counterions

[Display omitted] Diffusiophoresis of colloidal latex particles has been reported for molecular anions and cations of comparable size. In the present study, this phenomenon is observed for two types of charged colloids acting as multivalent electrolyte: (i) anionic charge-stabilised silica nanoparti...

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Bibliographic Details
Published in:Journal of colloid and interface science 2023-11, Vol.649, p.364-371
Main Authors: Rees-Zimmerman, Clare R., Chan, Derek H.H., Armes, Steven P., Routh, Alexander F.
Format: Article
Language:English
Subjects:
Colloidal hydrodynamics
Diblock copolymer nanoparticles
Diffusiophoresis
Hele-Shaw cell
Multivalent electrolytes
Silica nanoparticles
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Summary:[Display omitted] Diffusiophoresis of colloidal latex particles has been reported for molecular anions and cations of comparable size. In the present study, this phenomenon is observed for two types of charged colloids acting as multivalent electrolyte: (i) anionic charge-stabilised silica nanoparticles or (ii) minimally-charged sterically-stabilised diblock copolymer nanoparticles. Using a Hele-Shaw cell, a thin layer of relatively large latex particles is established within a sharp concentration gradient of nanoparticles by sequential filling with water, latex particles and nanoparticles. Asymmetric diffusion is observed, which provides strong evidence for diffusiophoresis. Quantification involves turbidity measurements from backlit images. The latex particles diffuse across a concentration gradient of charged nanoparticles and the latex concentration front scales approximately with time1/2. Moreover, the latex particle flux is inversely proportional to the concentration of background salt, confirming electrostatically-driven motion. These observations are consistent with theory recently developed to account for diffusiophoretic motion driven by multivalent ions.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2023.06.115