Control of size and shape of micelles, of flow properties, and of pH-values in aqueous CTAB-solutions via photoreactions of solubilizates
- 106 Downloads
phase diagrams of new surfactant systems
microemulsions and their applications
vesicles and bilayers
transport properties of colloidal systems.
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 wordsMicelles photochemistry rheology static light scattering
Unable to display preview. Download preview PDF.
- 2.Wolff T, von Bünau G (1984) Ber Bunsenges Phys Chem 88:1098Google Scholar
- 6.Schurz J (ed) (1974) Einführung in die Strukturrheologie, Verlag W. Kohlhammer GmbH, StuttgartGoogle Scholar
- 9.Angel M, Hoffmann H, Löbl M, Reizlein K, Thurn H, Wunderlich I (1984) Progr Coll & Polym Sci 69:12Google Scholar
- 11.Zachariasse KA, Kozanciewicz B, Kühnle W (1984) In: Mittal KL, Lindman B (eds) Surfactants in Solutions, Plenum Publishing Corporation, New York, Vol 1, p 565Google Scholar
- 13.Hoffmann H, Platz G, Ulbricht W (1986) Ber Bunsenges Phys Chem 90:877Google Scholar
- 14.Krollpfeiffer F, Branscheid F (1923) Chem Ber 56B:1617; Sieglitz A, Marx R (1923) Chem Ber 56B:1619; Martin RH, van Hove L (1952) Bull Soc Chim Belg 61:504Google Scholar
- 17.Kerker M (ed) (1969) The Scattering of Light, Academic Press, New YorkGoogle Scholar