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Small-angle neutron scattering on shear-induced micellar structures

  • Colloid Science
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Abstract

Small-angle neutron scattering (SANS) experiments on sheared aqueous surfactant solutions of tetradecyltrimethylammoniumsalicylate (TTMA-Sal) are reported. A5-mM-solution without shear shows a weak correlation peak at a momentum transfer of 0.09 nm−1 which has its origin in the micellar interaction. For shear rates above a threshold value of Γ=40 s−1 the scattering pattern shows an irregular increase in anisotropy. The analysis of the anisotropic pattern reveals the existence of two types of micelles: Small rodlike micelles which are weakly aligned and very large rodlike aggregates which are strongly aligned and which are present above the threshold value ofΓ. The two micelles are in equilibrium with each other and the equilibrium shifts with increasing shear rate to the side of the large oriented micelles.

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Author notes

  1. J. Kalus

    Present address: Experimentalphysik I of the University of Bayreuth, Bayreuth, F.R.G.

Authors and Affiliations

  1. Physikalische Chemie I of the University of Bayreuth, Bayreuth, F.R.G.

    H. Hoffmann

  2. Institut Max von Laue-Paul Langevin, 156 X, Grenoble, France

    K. Ibel

Authors
  1. J. Kalus
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  2. H. Hoffmann
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  3. K. Ibel
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Kalus, J., Hoffmann, H. & Ibel, K. Small-angle neutron scattering on shear-induced micellar structures. Colloid & Polymer Sci 267, 818–824 (1989). https://doi.org/10.1007/BF01410121

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  • DOI: https://doi.org/10.1007/BF01410121

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