Interparticle forces arising from adsorbed polyelectrolytes in colloidal suspensions

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

Research output: Contribution to journalArticle

104 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)43-52
Number of pages10
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume95
Issue number1
DOIs
Publication statusPublished - 10 Feb 1995

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carbopol 940
Polyelectrolytes
colloids
molecular weight
Suspensions
Molecular weight
acids
Yield stress
low molecular weights
Acids
Zeta potential
electrostatics
energy
Electrostatics
shift
Polymers
polymers
interactions

Cite this

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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.",
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Interparticle forces arising from adsorbed polyelectrolytes in colloidal suspensions. / Leong, Y. K.; Scales, P. J.; Healy, T. W.; Boger, D. V.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 95, No. 1, 10.02.1995, p. 43-52.

Research output: Contribution to journalArticle

TY - JOUR

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.

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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.

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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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