Polymer-mediated colloidal stability: on the transition between adsorption and depletion

Álvaro González García; Marjolijn M.B. Nagelkerke; Remco Tuinier; Mark Vis

doi:10.1016/j.cis.2019.102077

Polymer-mediated colloidal stability: on the transition between adsorption and depletion

Álvaro González García, Marjolijn M.B. Nagelkerke, Remco Tuinier^*, Mark Vis

^*Corresponding author for this work

Research output: Contribution to journal › Review article › peer-review

Abstract

Addition of polymers to a colloidal dispersion modulates the interactions between the colloids. We briefly review the effects of positive and negative adsorption (also termed depletion). The effective colloid–polymer interactions sensitively affect the colloidal phase behavior. We present a theoretical framework to predict the phase behavior of colloid–polymer mixtures for varying affinities between colloid and polymer, leading to either positive or negative adsorption of polymer segments. For certain conditions, polymers are neither depleted nor adsorbed: the polymer concentration is essentially constant up to the colloidal surface, a condition which we term neutral adsorption. Near this condition, the calculated phase diagrams reveal a stable–unstable–restabilisation transition with increasing polymer concentration. Similar effects have been reported experimentally, for instance as a function of temperature [Feng et al., Nat. Mat., 2015, 14, 61–65], which may modulate the effective polymer–colloid affinity. Understanding how to achieve neutral adsorption opens up the possibility of preparing highly dense, yet stable, colloid–polymer mixtures.

Original language	English
Article number	102077
Number of pages	12
Journal	Advances in Colloid and Interface Science
Volume	275
DOIs	https://doi.org/10.1016/j.cis.2019.102077
Publication status	Published - 1 Jan 2020

Funding

This paper is dedicated to the memory of Hans Lyklema (1930–2017), who was an inspirational teacher and a charismatic scientist. Hans was a highly knowledgeable physical-chemist with a unique combination of broad and in-depth expertise, as highlighted in his book series on Fundamentals of Colloid and Interface Science (Elsevier, 1991-2005). He turned the Wageningen colloid group into a very strong laboratory with a few seminal lines of research. On all kinds of topics Hans was highly opinionated, including for instance on sustainability, the topic of a seminal lecture on the occasion of his official retirement in 1995. We are thankful for what he did for the scientists in our field. A.G.G. acknowledges funding from the NWO-TA project 731.015.205 by NWO, DSM, and SymoChem. M.V. acknowledges the Netherlands Organisation for Scientific Research (NWO) for a Veni grant (no. 722.017.005).

Keywords

Adsorption
Bridging
Colloidal interaction
Colloid–polymer mixtures
Depletion
Phase behavior

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title = "Polymer-mediated colloidal stability: on the transition between adsorption and depletion",

abstract = "Addition of polymers to a colloidal dispersion modulates the interactions between the colloids. We briefly review the effects of positive and negative adsorption (also termed depletion). The effective colloid–polymer interactions sensitively affect the colloidal phase behavior. We present a theoretical framework to predict the phase behavior of colloid–polymer mixtures for varying affinities between colloid and polymer, leading to either positive or negative adsorption of polymer segments. For certain conditions, polymers are neither depleted nor adsorbed: the polymer concentration is essentially constant up to the colloidal surface, a condition which we term neutral adsorption. Near this condition, the calculated phase diagrams reveal a stable–unstable–restabilisation transition with increasing polymer concentration. Similar effects have been reported experimentally, for instance as a function of temperature [Feng et al., Nat. Mat., 2015, 14, 61–65], which may modulate the effective polymer–colloid affinity. Understanding how to achieve neutral adsorption opens up the possibility of preparing highly dense, yet stable, colloid–polymer mixtures.",

keywords = "Adsorption, Bridging, Colloidal interaction, Colloid–polymer mixtures, Depletion, Phase behavior",

author = "{Gonz{\'a}lez Garc{\'i}a}, {\'A}lvaro and Nagelkerke, {Marjolijn M.B.} and Remco Tuinier and Mark Vis",

year = "2020",

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doi = "10.1016/j.cis.2019.102077",

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T1 - Polymer-mediated colloidal stability

T2 - on the transition between adsorption and depletion

AU - González García, Álvaro

AU - Nagelkerke, Marjolijn M.B.

AU - Tuinier, Remco

AU - Vis, Mark

PY - 2020/1/1

Y1 - 2020/1/1

N2 - Addition of polymers to a colloidal dispersion modulates the interactions between the colloids. We briefly review the effects of positive and negative adsorption (also termed depletion). The effective colloid–polymer interactions sensitively affect the colloidal phase behavior. We present a theoretical framework to predict the phase behavior of colloid–polymer mixtures for varying affinities between colloid and polymer, leading to either positive or negative adsorption of polymer segments. For certain conditions, polymers are neither depleted nor adsorbed: the polymer concentration is essentially constant up to the colloidal surface, a condition which we term neutral adsorption. Near this condition, the calculated phase diagrams reveal a stable–unstable–restabilisation transition with increasing polymer concentration. Similar effects have been reported experimentally, for instance as a function of temperature [Feng et al., Nat. Mat., 2015, 14, 61–65], which may modulate the effective polymer–colloid affinity. Understanding how to achieve neutral adsorption opens up the possibility of preparing highly dense, yet stable, colloid–polymer mixtures.

AB - Addition of polymers to a colloidal dispersion modulates the interactions between the colloids. We briefly review the effects of positive and negative adsorption (also termed depletion). The effective colloid–polymer interactions sensitively affect the colloidal phase behavior. We present a theoretical framework to predict the phase behavior of colloid–polymer mixtures for varying affinities between colloid and polymer, leading to either positive or negative adsorption of polymer segments. For certain conditions, polymers are neither depleted nor adsorbed: the polymer concentration is essentially constant up to the colloidal surface, a condition which we term neutral adsorption. Near this condition, the calculated phase diagrams reveal a stable–unstable–restabilisation transition with increasing polymer concentration. Similar effects have been reported experimentally, for instance as a function of temperature [Feng et al., Nat. Mat., 2015, 14, 61–65], which may modulate the effective polymer–colloid affinity. Understanding how to achieve neutral adsorption opens up the possibility of preparing highly dense, yet stable, colloid–polymer mixtures.

KW - Adsorption

KW - Bridging

KW - Colloidal interaction

KW - Colloid–polymer mixtures

KW - Depletion

KW - Phase behavior

U2 - 10.1016/j.cis.2019.102077

DO - 10.1016/j.cis.2019.102077

M3 - Review article

C2 - 31816521

AN - SCOPUS:85076050470

SN - 0001-8686

VL - 275

JO - Advances in Colloid and Interface Science

JF - Advances in Colloid and Interface Science

M1 - 102077

ER -

Polymer-mediated colloidal stability: on the transition between adsorption and depletion

Abstract

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Keywords

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