Diffusiophoresis of latex driven by anionic nanoparticles and their counterions

Clare R. Rees-Zimmerman; Derek H.H. Chan; Steven P. Armes; Alexander F. Routh

doi:10.1016/j.jcis.2023.06.115

Diffusiophoresis of latex driven by anionic nanoparticles and their counterions

Clare R. Rees-Zimmerman, Derek H.H. Chan, Steven P. Armes, Alexander F. Routh

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

9 Citations (SciVal)

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 time^1/2. 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.

Original language	English
Pages (from-to)	364-371
Number of pages	8
Journal	Journal of Colloid and Interface Science
Volume	649
Early online date	17 Jun 2023
DOIs	https://doi.org/10.1016/j.jcis.2023.06.115
Publication status	Published - 30 Nov 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors

Data Availability Statement

Data will be made available on request.

Acknowledgements

The authors thank Lotty Gladstone (Institute for Energy and Environmental Flows, University of Cambridge) for help with the experimental set-up, Andrew Pluck (Institute for Energy and Environmental Flows, University of Cambridge) for making the Hele-Shaw cell, and Daan Frenkel (Department of Chemistry, University of Cambridge) for very helpful discussions. The latex particles were kindly synthesised by Dr. N. Ballard at the University of the Basque Country, Spain.

Funding

CRRZ’s work was funded by an Oppenheimer Studentship. DHHC was supported by an Industrial CASE PhD studentship provided by Syngenta. SPA acknowledges a four-year EPSRC Established Career Particle Technology Fellowship (EP/R003009).

Keywords

Colloidal hydrodynamics
Diblock copolymer nanoparticles
Diffusiophoresis
Hele-Shaw cell
Multivalent electrolytes
Silica nanoparticles

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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Cite this

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title = "Diffusiophoresis of latex driven by anionic nanoparticles and their counterions",

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.",

keywords = "Colloidal hydrodynamics, Diblock copolymer nanoparticles, Diffusiophoresis, Hele-Shaw cell, Multivalent electrolytes, Silica nanoparticles",

author = "Rees-Zimmerman, \{Clare R.\} and Chan, \{Derek H.H.\} and Armes, \{Steven P.\} and Routh, \{Alexander F.\}",

note = "Publisher Copyright: {\textcopyright} 2023 The Authors",

year = "2023",

month = nov,

day = "30",

doi = "10.1016/j.jcis.2023.06.115",

language = "English",

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T1 - Diffusiophoresis of latex driven by anionic nanoparticles and their counterions

AU - Rees-Zimmerman, Clare R.

AU - Chan, Derek H.H.

AU - Armes, Steven P.

AU - Routh, Alexander F.

PY - 2023/11/30

Y1 - 2023/11/30

N2 - 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.

AB - 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.

KW - Colloidal hydrodynamics

KW - Diblock copolymer nanoparticles

KW - Diffusiophoresis

KW - Hele-Shaw cell

KW - Multivalent electrolytes

KW - Silica nanoparticles

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DO - 10.1016/j.jcis.2023.06.115

M3 - Article

SN - 0021-9797

VL - 649

SP - 364

EP - 371

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

ER -

Diffusiophoresis of latex driven by anionic nanoparticles and their counterions

Abstract

Bibliographical note

Data Availability Statement

Acknowledgements

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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Cite this