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Control of size and shape of micelles, of flow properties, and of pH-values in aqueous CTAB-solutions via photoreactions of solubilizates

Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 73)

Abstract

“New Trends in Colliod Science” contains the proceedings of the foundation meeting of the European Colloid and Interface Society (ECIS), October 1–3, 1986. Representatives from the major European groups working in this field contributed to the conference. The volume contains an up-to-date account of present developments in Colloid Science. The contributions cover a wide scope of subjects, and provide encouragement that structures and transport processes in dense colloidal systems can be understood on basic principles. The main subjects are include:
  • phase diagrams of new surfactant systems

  • microemulsions and their applications

  • vesicles and bilayers

  • transport properties of colloidal systems.

Abstract

The influence of in situ photochemical transformations of aromatic solubilizates on the flow properties of aqueous micellar solutions of cetyltrimethylammonium bromide was investigated, using Ostwald-viscometers in cases of Newtonian flow and a rotating viscometer in cases of non Newtonian flow behaviour, i. e. rheopexy, thixotropy, and viscoelasticity. Newtonian flow was observed in systems containing trans and/or cis-stilbene derivatives or nonpolar 9-substituted anthracenes as solubilizates which are photochemically cis-trans isomerized or photodimerized, respectively, whereby the viscosity changed. Non Newtonian flow was observed in systems containing 9-anthracene carboxylic acid which could be photodimerized while a change of flow behaviour occurs simultaneously. In these systems pH changes were observed upon irradiation. Static light scattering experiments at low angles indicated that spherical micelles differing in radius exist in the systems exhibiting Newtonian flow, while in the non Newtonian systems rod-like aggregates differing in length are present.

Key words

Micelles photochemistry rheology static light scattering 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1987

Authors and Affiliations

  1. 1.Fachbereiche Chemie-BiologieUniversität GesamthochshuleSiegenSiegenGermany

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