The aggregation behaviour of tetradecyldimethylaminoxide

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


“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.


Static and dynamic light scattering, electrical birefringence, kinetic and rheological measurements were carried out on aqueous solutions of the zwitterionic surfactant tetradecyldimethylaminoxide (C14DMAO) up to the liquid crystalline (l. c.) region. In the dilute concentration range the system forms globular micelles up to about 10 mM solutions. For higher concentrations, rodlike aggregates can be detected which increase in size with increasing concentration. At the overlap region of 100 mM solutions the forces between the micelles are repulsive up to the phase boundary and the light scattering decreases. With increasing temperature the system makes a sphere/rod transition which is indicated both by the temperature dependence of light scattering and electric birefringence. The experimental data show that the surfactant behaves like a nonionic system for low temperatures and like an ionic system for high temperatures. Also the cmc value, which is between a purely cationic and a nomonic system, shows the ambivalent nature of the surfactant. The system has no cloud point and forms a nematic phase as the first l. c. phase.

Key words

Micelles electric birefringence phase diagram sphere/rod transition light scattering 


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Copyright information

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

Authors and Affiliations

  1. 1.Lehrstuhl für Physikalische Chemie IUniversität BayreuthBayreuthGermany

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