Rheological transitions in asymmetric colloidal star mixtures |
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| Authors: | Christian Mayer Emmanuel Stiakakis Emanuela Zaccarelli Christos N Likos Francesco Sciortino Piero Tartaglia Hartmut Löwen Dimitris Vlassopoulos |
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| Institution: | 1.Institut für Theoretische Physik II: Soft Matter,Heinrich-Heine-Universit?t Düsseldorf,Düsseldorf,Germany;2.FO.R.T.H., Institute of Electronic Structure and Laser,Heraklion,Greece;3.Dipartimento di Fisica and CNR-INFM-SOFT,Università di Roma La Sapienza,Rome,Italy;4.Dipartimento di Fisica and CNR-INFM-SMC,Università di Roma La Sapienza,Rome,Italy;5.Department of Materials Science and Technology,University of Crete,Heraklion,Greece |
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| Abstract: | We examine the rheological transition from an arrested to a fluid state for different mixtures of star polymers with varying
functionality and size ratios. As a general trend, we find that addition of smaller star polymers in an arrested, concentrated
solution of larger ones brings about melting of the large star glass. At the same time, the dependence of the amount of additives
needed to melt the glass has a nontrivial dependence on the size ratio. Theoretical analysis, based on effective interactions
and Mode Coupling Theory, reproduces the experimental results and helps identify two distinct types of glasses in the composite
system.
This paper was presented at Annual European Rheology Conference (AERC) held in Hersonisos, Crete, Greece, April 27–29, 2006. |
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| Keywords: | Rheology Glasses Star polymers Mode coupling theory |
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