Restructuring and aging in a capillary suspension

Rheologica Acta
Erin KoosNorbert Willenbacher

Abstract

The rheological properties of capillary suspensions, suspensions with small amounts of an added immiscible fluid, are dramatically altered with the addition of the secondary fluid. We investigate a capillary suspension to determine how the network ages and restructures at rest and under applied external shear deformation. The present work uses calcium carbonate suspended in silicone oil (11 % solids) with added water as a model system. Aging of capillary suspensions and their response to applied oscillatory shear is distinctly different from particulate gels dominated by the van der Waals forces. The suspensions dominated by the capillary force are very sensitive to oscillatory flow, with the linear viscoelastic regime ending at a deformation of only 0.1% and demonstrating power-law aging behavior. This aging persists for long times at low deformations or for shorter times with a sudden decrease in the strength at higher deformations. This aging behavior suggests that the network is able to rearrange and even rupture. This same sensitivity is not demonstrated in shear flow where very high shear rates are required to rupture the agglomerates returning the apparent viscosity of capillary suspensions to the same viscosity as for t...Continue Reading

References

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Aug 7, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·G Ovarlez, P Coussot
Apr 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Hans-Jürgen Butt
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Oct 19, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Christoph GögeleinStephan Herminghaus
Feb 19, 2011·Science·Erin Koos, Norbert Willenbacher
Jun 12, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Andrea Fortini

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Citations

Jan 26, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Frank Bossler, Erin Koos
Mar 3, 2015·Current Opinion in Colloid & Interface Science·Erin Koos
Aug 11, 2016·Scientific Reports·Monica SchneiderNorbert Willenbacher
Feb 15, 2017·Colloids and Surfaces. A, Physicochemical and Engineering Aspects·Frank BosslerErin Koos
Mar 7, 2017·ACS Applied Materials & Interfaces·Monica SchneiderErin Koos
Jun 20, 2020·Soft Matter·Omotola OkesanjoSven H Behrens
Dec 15, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Timothy S DunstanVesselin N Paunov
Dec 7, 2017·ACS Applied Materials & Interfaces·Anupam A K DasVesselin N Paunov
Aug 27, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Omotola OkesanjoSven H Behrens

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