Journal Article

PreJuSER-8956

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Slow dynamics, aging, and crystallization of multiarm star glasses

Stiakakis, E.FZJ* ; Wilk, A. ; Kohlbrecher, J. ; Vlassopoulos, D. ; Petekidis, G.

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/4668  doi:10.1103/PhysRevE.81.020402

Abstract: Multiarm star polymers are model systems with tunable intermediate colloid to polymerlike character, exhibiting rich phase behavior, internal relaxations, and flow properties. An important puzzle for several years has been the lack of clear experimental proof of crystalline states despite strong theoretical predictions. We present unambiguous evidence via multispeckle dynamic light scattering (MSDLS) and small-angle neutron scattering (SANS) for such crystallization in a solvent of intermediate quality. An unexpected speed up of the short-time star diffusion observed in MSDLS was attributed by SANS to crystallization, via aging, of the multiam star glass. This delayed glass to crystal transition establishes a pathway for star crystallization that might be generic in colloidal glasses.

Keyword(s): J

Note: We thank J. Roovers for providing the stars and for comments on the Rapid Communication, N. Hadjichristidis for the deuterated sample, L. Cipelletti for the multispeckle correlation code, and A. Pamvouksoglou for experimental help. We acknowledge EU funding through ToK "Cosines," NoE "SoftComp," and NMP SMALL "Nanodirect."

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Contributing Institute(s):

1. Weiche Materie (IFF-7)

Research Program(s):

1. Kondensierte Materie (FUEK414) (FUEK414)
2. 450 - BioSoft (POF2-400) (POF2-400)

Appears in the scientific report 2010

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