Exploring the Origin of Viscoelasticity in Colloidal Suspensions
Using charged colloidal suspension as a model system, we were able to connect the nonlinear rheological characteristics and the non-equilibrium microstructure under steady shear flow and proposed a new mechanism of deformation. We demonstrated that the nonlinear rheological behavior is a direct consequence of the presence of a localized elastic response within a certain length scale promoted by particle interaction. We believe that the presence of this 'elastic zone' is responsible of the nonlinear rheological behaviors of charged colloidal suspensions in general. To prove this hypothesis, we plan to investigate suspensions with the same volume fraction but different interaction potential by tuning the ionic strength of the solution in order to determine the dependence of the elastic zone with interaction potentials.
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CHEN Wei Ren; BAGLIONI Piero; EGAMI Takeshi; IWASHITA Takuya; LAM Christopher and PORCAR Lionel. (2017). Exploring the Origin of Viscoelasticity in Colloidal Suspensions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1508
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