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Evidence of re-entrant behavior in laponite-PEO systems

Published online by Cambridge University Press:  26 February 2011

Hossein Baghdadi ,
Surita R. Bhatia ,
Elizabeth E. C. Jensen  and
Nalini Easwar
Hossein Baghdadi
Affiliation:
hossein@acad.umass.edu, University of Massachusetts - Amherst, Chemical Engineering, 686 North Pleasant St, Amherst, MA, 01002, United States, 413-545-6157
Surita R. Bhatia
Affiliation:
sbhatia@ecs.umass.edu, University of Massachusetts - Amherst, Chemical Engineering, United States
Elizabeth E. C. Jensen
Affiliation:
ejensen2@email.smith.edu, Smith College, Department of Physics, United States
Nalini Easwar
Affiliation:
neaswar@email.smith.edu, Smith College, Department of Physics, United States
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Abstract

Rheology and dynamic light scattering capture re-entrant behavior of laponite-polymer systems. Neat laponite under basics conditions and concentrations of 2wt% or greater forms a viscoelastic soft glass due to electrostatic repulsions. We show that that addition of low molecular weight poly(ethylene oxide) (PEO) melts the glass due to a depletion force. The depletion force speeds up dynamics in the system resulting in a low viscosity solution. A re-entrant viscoelastic solid is formed with the addition of high molecular weight PEO due to the polymer chains bridging between laponite particles. As expected the transition from a low to high viscosity solution scales with the polymer mean square end-to-end distance and gap between laponite particles.

Keywords

colloidadsorptionpolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 899: Symposium N – Dynamics in Small Confining Systems VIII , 2005 , 0899-N09-03
Copyright
Copyright © Materials Research Society 2006

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