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USANS as a Probe of Large-Scale Structure in Attractive Colloidal Glasses of Block Copolymer Micelles

Published online by Cambridge University Press:  01 February 2011

Mark A. Crichton ,
Neil S. Forbes  and
Surita R. Bhatia
Mark A. Crichton
Affiliation:
Department of Chemical Engineering, University of Massachusetts Amherst 686 North Pleasant Street, Amherst, MA 01003, U.S.A.
Neil S. Forbes
Affiliation:
Department of Chemical Engineering, University of Massachusetts Amherst 686 North Pleasant Street, Amherst, MA 01003, U.S.A.
Surita R. Bhatia
Affiliation:
Department of Chemical Engineering, University of Massachusetts Amherst 686 North Pleasant Street, Amherst, MA 01003, U.S.A.
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Abstract

We have used ultra-small-angle scattering (USANS) and fluorescence microscopy to show the existence of large-scale structure in attractive colloidal glasses composed of block polyelectrolyte micelles. Our systems display evidence of surface scattering, with the scattered intensity I at low scattering vector q scaling as I ∼ qx with x in the range –3 to –4. We believe this is due to surface scattering from large, highly polydisperse aggregates with rough interfaces. USANS may provide an ideal way to distinguish fractal colloidal gels and colloidal glasses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 840: Symposium Q – Neutron and X-Ray Scattering as Probes of Multiscale Phenomena , 2004 , Q7.11
Copyright
Copyright © Materials Research Society 2005

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References

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