Viscoelasticity of nano-alumina dispersions

Conference · Sat Jun 01 04:00:00 EDT 1996

OSTI ID:229985

Rand, B; Fries, R ^[1]

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1. Univ. of Leeds (United Kingdom)

The flow and viscoelastic properties of electrostatically stabilized nano-alumina dispersions have been studied as a function of ionic strength and volume fraction of solids. At low ionic strength the suspensions were deflocculated and showed a transition from viscous to elastic behavior as the solid content increased associated with the onset of double layer interpenetration. The phase transition was progressively shifted to higher solids fractions with increasing ionic strength. At higher ionic strength, above the critical coagulation concentration, the suspensions formed attractive networks characterized by high elasticity. Two independent methods of estimating the effective radius of electrostatically stabilized {open_quotes}soft{close_quotes} particles, a{sub eff}, are presented based on phase angle data and a modified Dougherty-Krieger equation. The results suggest that a{sub eff} is not constant for a given system but changes with both solids fraction and ionic strength.

• OSTI ID: 229985
• Report Number(s): CONF-9505249--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
DISPERSIONS
ELASTICITY
PH VALUE
SURFACES
SUSPENSIONS