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

  • Mark A. Crichton (a1), Neil S. Forbes (a1) and Surita R. Bhatia (a1)

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.

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2. Bhatia, S R and Mourchid, A, Langmuir 18, 64696472 (2002).
3. Bhatia, S. R., Mourchid, A., and Joanicot, M., Current Opinion in Colloid and Interface Science 6, 471478 (2001).
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USANS as a Probe of Large-Scale Structure in Attractive Colloidal Glasses of Block Copolymer Micelles

  • Mark A. Crichton (a1), Neil S. Forbes (a1) and Surita R. Bhatia (a1)

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