Rees-Zimmerman, C.R., Chan, D.H.H., Armes, S.P. orcid.org/0000-0002-8289-6351 et al. (1 more author) (2023) Diffusiophoresis of latex driven by anionic nanoparticles and their counterions. Journal of Colloid and Interface Science, 649. pp. 364-371. ISSN 0021-9797
Abstract
Hypothesis
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.
Experiments
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.
Findings
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.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2023 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Colloidal hydrodynamics; Diblock copolymer nanoparticles; Diffusiophoresis; Hele-Shaw cell; Multivalent electrolytes; Silica nanoparticles |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/R003009/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 Jan 2024 09:58 |
Last Modified: | 25 Jan 2024 09:58 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.jcis.2023.06.115 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:208126 |
Download
Filename: Diffusiophoresis using charged diblock copolymer nanoparticles (JCIS, 2023).pdf
Licence: CC-BY 4.0