Interparticle forces arising from adsorbed polyelectrolytes in colloidal suspensions

Y. K. Leong; P. J. Scales; T. W. Healy; D. V. Boger

doi:10.1016/0927-7757(94)03010-W

Interparticle forces arising from adsorbed polyelectrolytes in colloidal suspensions

Y. K. Leong, P. J. Scales, T. W. Healy, D. V. Boger

Chemical Engineering

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

111 Citations (Scopus)

Abstract

The effects of molecular weight (MW) and concentration of polyacrylic acid (PAA) on the yield stress τ_y of ZrO₂ suspensions were evaluated. The M_w range studied was from 1656 to 750000. The effect of adsorbed polyelectrolyte on the forces between particles was determined by focussing on the pH at which zero zeta-potential (ζ=0) is observed in the presence and absence of polymer. At this ζ=0 condition a maximum in yield stress (τ_ymax) is observed. Low molecular weight PAA imposes a steric (repulsive) interaction energy which is gradually replaced by a bridging (attractive) energy as the molecular weight is increased. The shift in τ_ymax and the pH at which ζ=0 both show systematic changes with M_w as electrostatic, steric, van der Waals and bridging forces change in relative importance.

Original language	English
Pages (from-to)	43-52
Number of pages	10
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	95
Issue number	1
DOIs	https://doi.org/10.1016/0927-7757(94)03010-W
Publication status	Published - 10 Feb 1995

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title = "Interparticle forces arising from adsorbed polyelectrolytes in colloidal suspensions",

abstract = "The effects of molecular weight (MW) and concentration of polyacrylic acid (PAA) on the yield stress τy of ZrO2 suspensions were evaluated. The Mw range studied was from 1656 to 750000. The effect of adsorbed polyelectrolyte on the forces between particles was determined by focussing on the pH at which zero zeta-potential (ζ=0) is observed in the presence and absence of polymer. At this ζ=0 condition a maximum in yield stress (τymax) is observed. Low molecular weight PAA imposes a steric (repulsive) interaction energy which is gradually replaced by a bridging (attractive) energy as the molecular weight is increased. The shift in τymax and the pH at which ζ=0 both show systematic changes with Mw as electrostatic, steric, van der Waals and bridging forces change in relative importance.",

keywords = "Adsorption, Bridging, Citric acid, Isoelectric point, Molecular weight, Polyacrylic acid, Steric, Yield stress, Zirconia",

author = "Leong, {Y. K.} and Scales, {P. J.} and Healy, {T. W.} and Boger, {D. V.}",

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T1 - Interparticle forces arising from adsorbed polyelectrolytes in colloidal suspensions

AU - Leong, Y. K.

AU - Scales, P. J.

AU - Healy, T. W.

AU - Boger, D. V.

PY - 1995/2/10

Y1 - 1995/2/10

N2 - The effects of molecular weight (MW) and concentration of polyacrylic acid (PAA) on the yield stress τy of ZrO2 suspensions were evaluated. The Mw range studied was from 1656 to 750000. The effect of adsorbed polyelectrolyte on the forces between particles was determined by focussing on the pH at which zero zeta-potential (ζ=0) is observed in the presence and absence of polymer. At this ζ=0 condition a maximum in yield stress (τymax) is observed. Low molecular weight PAA imposes a steric (repulsive) interaction energy which is gradually replaced by a bridging (attractive) energy as the molecular weight is increased. The shift in τymax and the pH at which ζ=0 both show systematic changes with Mw as electrostatic, steric, van der Waals and bridging forces change in relative importance.

AB - The effects of molecular weight (MW) and concentration of polyacrylic acid (PAA) on the yield stress τy of ZrO2 suspensions were evaluated. The Mw range studied was from 1656 to 750000. The effect of adsorbed polyelectrolyte on the forces between particles was determined by focussing on the pH at which zero zeta-potential (ζ=0) is observed in the presence and absence of polymer. At this ζ=0 condition a maximum in yield stress (τymax) is observed. Low molecular weight PAA imposes a steric (repulsive) interaction energy which is gradually replaced by a bridging (attractive) energy as the molecular weight is increased. The shift in τymax and the pH at which ζ=0 both show systematic changes with Mw as electrostatic, steric, van der Waals and bridging forces change in relative importance.

KW - Adsorption

KW - Bridging

KW - Citric acid

KW - Isoelectric point

KW - Molecular weight

KW - Polyacrylic acid

KW - Steric

KW - Yield stress

KW - Zirconia

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U2 - 10.1016/0927-7757(94)03010-W

DO - 10.1016/0927-7757(94)03010-W

M3 - Article

AN - SCOPUS:0029255157

SN - 0927-7757

VL - 95

SP - 43

EP - 52

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

IS - 1

ER -

Interparticle forces arising from adsorbed polyelectrolytes in colloidal suspensions

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