Signature of multiple glassy states in micellar nanoparticle-polymer composites

Details Signature of multiple glassy states in micellar nanoparticle-polymer composites Signature of multiple glassy states in micellar nanoparticle-polymer composites

2008-09-11

arxiv.org/abs/0809.2004v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 3 figures

Scientific paper

We present results of temperature dependent measurements of dynamics of micellar nanoparticle - polymer composites of fixed volume fraction and variable polymer chain grafting density. For nanoparticles with lower grafting density we observe dynamically arrested state at low temperatures corresponding to an attractive glass while at high temperature the same system shows relaxation typical of a repulsive glass. For higher grafting density, the low temperature dynamics resembles more of a gel which crosses over to a repulsive glass at high temperature. Possible reasons for such fascinating dynamical transitions is delineated.

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