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Viscoelastic properties of particle gels
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 209, 162-172 p.Article in journal (Refereed)
Abstract [en]

The effect of strength of attraction and volume fraction on the mechanical properties of alumina particle networks were investigated. Alumina particle gels were formed reversibly and in situ in the rheometer by cooling alumina particle suspensions with adsorbed poly(12-hydroxy stearic acid) suspended in a marginal solvent, hexanol. The collapse of the polymer layer with decreasing solvency (temperature) induces flocculation when the long-range van der Waals force overcomes the remaining steric repulsion. The gelation temperature depends on volume fraction. At the gel temperature, Tgel, the gel becomes predominantly elastic; at temperatures below Tgel, the elasticity increases with decreasing temperature. We find that the elastic modulus data, measured over a wide range of volume fraction (0.2 < φ < 0.425) and temperature (10-14°C), follows: G = G0(φ - φg)s. This scaling suggests the prefactor and exponent to be independent of temperature. We present some arguments for why subjecting a particle gel to a preshear procedure might result in an temperature-dependent prefactor. By invoking such an effect, we are able to rescale and collapse previously published moduli data on presheared suspensions according to the (φ - φg) expression.

Place, publisher, year, edition, pages
1999. Vol. 209, 162-172 p.
Keyword [en]
Particle gels, viscoelastic, alumina, percolation, network
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26717OAI: oai:DiVA.org:ri-26717DiVA: diva2:1053720
Note
A1207Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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