Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 348, Issue 1-3, Pages 39-44Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2009.06.025
Keywords
Rheology; Shear thickening; Relative viscosity; Cobalt oxide and cubic particles
Categories
Funding
- National Science Foundation [DMR 0404278, DMR 0611612]
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Narrow size distribution cubic Co3O4 nanoparticles were synthesized and rheological properties of suspensions of the cubes in oligomeric polyethylene glycol (PEG) were explored over a range of particle volume fractions and rotational shear flow conditions. At low and high particle volume fractions, the relative viscosity of the Suspensions is described by a Krieger-Dougherty formula With all intrinsic Viscosity consistent with expectations for suspensions of ideal cuboids. At intermediate to high particle loadings. the Suspensions manifest complex rheological behavior, including shear thinning and shear-thickening features. These observations are discussed in terms of the charge carried by the cubes and the shear rate/volume fraction dependency of the transition from shear thinning to shear thickening. (C) 2009 Elsevier B.V. All rights reserved.
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