Colloids and Interfaces

Special Issue Editor

Prof. Martin Snowden

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Guest Editor

Faculty of Engineering and Science, University of Greenwich, Chatham Maritime ME4 4TB, UK
Interests: colloid science; formulation; polymers in solution; smart polymers; gels and microgels

Special Issue Information

Dear Colleagues,

The objective of this Special Issue on Colloids and Colloidal Stability is to collect the latest understandings of the processes and mechanisms driving colloidal interactions. An adsorbed polymer layer can confer stabilization in colloidal dispersions; however, the delicate balance of the affinity of a polymer for the surface of the colloid relative to its affinity for the dispersion medium can readily be changed, which may lead to a shift from a disperse to a flocculated system. The roles of temperature, particle concentration, co-solutes, co-solvents, and pH are often important but are commonly overlooked in many industrial formulations. The role of free non-adsorbed polymer and/or surfactants in a system is to confer a desired viscosity profile; however, free polymer and surfactant can also contribute to depletion flocculation. Understanding the role of these processes in colloidal systems is critical to understanding the mechanics, behaviour, and performance of many commercial formulations. The main objective of this Special Issue is to provide a go-to edition of Colloids and Interfaces that will serve as a state-of-the-art reference for colloid scientists and formulators working in fields including pharmaceutical science, and are-chemicals, personal and domestic products.

Prof. Martin Snowden
Guest Editor

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Keywords

Colloid stability
Depletion flocculation
Hetero-flocculation
Steric stabilization
Incipient flocculation

Published Papers (1 paper)

Research

17 pages, 4346 KiB

Open AccessArticle

Diffusiophoresis in Suspensions of Charged Soft Particles

by Wei C. Lin and Huan J. Keh

Colloids Interfaces 2020, 4(3), 30; https://doi.org/10.3390/colloids4030030 - 29 Jul 2020

Cited by 9 | Viewed by 2615

Abstract

The diffusiophoresis in a suspension of charged soft particles in electrolyte solution is analyzed. Each soft particle is composed of a hard core of radius

r_{0}

and surface charge density

σ

and an adsorbed fluid-penetrable porous shell of thickness [...] Read more.

The diffusiophoresis in a suspension of charged soft particles in electrolyte solution is analyzed. Each soft particle is composed of a hard core of radius

r_{0}

and surface charge density

σ

and an adsorbed fluid-penetrable porous shell of thickness

a - r_{0}

and fixed charge density

Q

. The effect of particle interactions is considered by using a unit cell model. The ionic concentration, electric potential, and fluid velocity distributions in a unit cell are solved as power expansions in

σ

and

Q

, and an explicit formula for the diffusiophoretic velocity of the soft particle is derived from a balance between the hydrodynamic and electrostatic forces exerted on it. This formula is correct to the second orders of

σ

and

Q

and valid for arbitrary values of

κ a

λ a

r_{0} / a

, and the particle volume fraction of the suspension, where

κ

is the Debye screening parameter and

λ

is the reciprocal of a length featuring the flow penetration into the porous shell. The effects of the physical characteristics and particle interactions on the diffusiophoresis (including electrophoresis and chemiphoresis) in a suspension of charged soft particles, which become those of hard particles and porous particles in the limits

r_{0} = a

and

r_{0} = 0

, respectively, are significant and complicated. Full article

(This article belongs to the Special Issue Colloids and Colloidal Stability)

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