Journal Article

PreJuSER-15516

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Probing glassy states in binary mixtures of soft interpenetrable colloids

Stiakakis, E.FZJ* ; Erwin, B. M. ; Vlassopoulos, D. ; Cloitre, M. ; Munam, A. ; Gauthier, M. ; Iatrou, H. ; Hadjichristidis, N.

2011
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0953-8984/23/23/234116

Abstract: We present experimental evidence confirming the recently established rich dynamic state diagram of asymmetric binary mixtures of soft colloidal spheres. These mixtures consist of glassy suspensions of large star polymers to which different small stars are added at varying concentrations. Using rheology and dynamic light scattering measurements along with a simple phenomenological analysis, we show the existence of re-entrance and multiple glassy states, which exhibit distinct features. Cooperative diffusion, as a probe for star arm interpenetration, is proven to be sensitive to the formation of the liquid pockets which signal the melting of the large-star-glass upon addition of small stars. These results provide ample opportunities for tailoring the properties of soft colloidal glasses.

Keyword(s): J

Note: We thank A Larsen for assistance with the DLS measurements and C N Likos, G Fytas and A N Semenov for discussions. This work was supported in part by the EU (NoE Softcomp NMP3-CT-2004-502235 and project NANODIRECT CP-FP 213948-2) and by the Natural Sciences and Engineering Research Council of Canada (NSERC).

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Contributing Institute(s):

1. Weiche Materie (ICS-3)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. NANODIRECT - Toolbox for Directed and Controlled Self-Assembly of nano-Colloids (213948) (213948)

Appears in the scientific report 2011

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