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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
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 Iq x 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
Copyright
Copyright © Materials Research Society 2005

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References

1. Tanaka, H., Meunier, J., and Bonn, D., Physical Review E 69, 031404 (2004).CrossRefGoogle Scholar
2. Bhatia, S R and Mourchid, A, Langmuir 18, 64696472 (2002).CrossRefGoogle Scholar
3. Bhatia, S. R., Mourchid, A., and Joanicot, M., Current Opinion in Colloid and Interface Science 6, 471478 (2001).CrossRefGoogle Scholar
4. Crichton, M. A. and Bhatia, S. R., Journal of Applied Polymer Science 93, 490497 (2004).CrossRefGoogle Scholar
5. Shah, S. A., Chen, Y. L., Ramakrishnan, S., Schweizer, K. S., and Zukoski, C. F., J Phys: Conden Matter 15, 47514778 (2003).Google Scholar
6. Pontoni, D. and Narayanan, T., J Appl Cryst 36, 787790 (2003).CrossRefGoogle Scholar

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