NDLI: Yield stress and microstructure of washed oxide suspensions at the isoelectric point: experimental and model fractal structure

Content Provider	Springer Nature Link
Author	Au, Pek Ing Liu, Jishan Leong, Yee Kwong
Copyright Year	2016
Abstract	The yield stress and microstructure of washed, relatively monodisperse spherical zirconia (ZrO2) and titania (TiO2) suspensions at the isoelectric point (pI) were characterised. The yield stress was found to be dependent upon the particle size. At a given solid concentration, the finer suspensions produced a larger yield stress due to the higher particle concentration and hence, a greater density of attractive interaction. At pI, only the van der Waals force is in play. Vitrified fractal microstructures of these suspensions at pI were captured by cryo-SEM. A power law relationship described the (maximum) yield stress–volume fraction data for both oxides which is consistent with the prediction of scaling theory. An exponent value of ∼3 was obtained for both oxides. The fractal dimension (D f) extracted from this exponent value of the scaling law for large aggregate cluster interaction in the slow flow regime was ∼2.3. The theoretical fractal structure with the same D f constructed from monodisperse spherical particles based on the off-lattice variable-D f model showed strong resemblance to the cryo-SEM imagery of the vitrified structure for both oxides.
Starting Page	847
Ending Page	856
Page Count	10
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	55
Issue Number	10
e-ISSN	14351528
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-08-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Surface forces Yield stress Microstructure Point of zero charge Spherical particle Fractal dimension Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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