Formation and Dynamics of Self-Organized Structures in by Kyoji Kawasaki, Bjoern Lindmann, Hirofumi Okabayashi

By Kyoji Kawasaki, Bjoern Lindmann, Hirofumi Okabayashi

The overseas Symposium on Colloid and Polymer technological know-how used to be held at Nagoya Institute of expertise, Nagoya, Japan, in October 1996. this system coated either the basic elements in addition to technological functions of micelles, microemulsions, monolayers, and biocolloids. specified emphasis was once put on formation and dynamics of self-organized buildings, together with technical advancements, functions, common conception, and result of investigations.

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G. the adsorption isotherm. e. bound + free) surfactant concentration needed to give a significant increase in turbidity due to formation of large ftocs in the polyelectrolyte surfactant solution. 01cmc. The free surfactant concentration at CaCb is thus lower than these values. It is also possible to determine a critical association concentration between surfactants and polyelectrotytes at the surface (cacs) which will depend on the properties of the surfactant, the polyelectrolyte and the surfaces.

M. Claesson et al, Polyelectrolyte-surfactant interactions wavelengths of the standing waves that are created are determined in a spectrometer. F r o m these data the distance between the surfaces is calculated with an accuracy of about 2 A. The force, F(D), is measured from the deflection of the spring and it is normalized by the local geometric mean radius of the surfaces, R, which is approximately 2 cm. According to the Derjaguin approximation [14] this quantity is related to the free energy of interaction per unit area between flat surfaces, Ge(D): F(D) - 2~Gr(D) R 10 -~ M KBr solution are shown in Fig.

Data are shown for PCMA (squares), AM-MAPTAC-30 (circles) and AMCMA-10 (diamonds) concentration at the surface, caG, that in general will depend on ionic strength, type of polyelectrolyte, type of surfactant and properties of the interface. We found that for highly charged cationic polyelectrolytes and anionic surfactant, SDS, the cac~ at the negatively charged mica surface is higher than the cac in bulk solution. This can be rationalized by considering the counterion entropy, chain stiffness and competition between surfactants and charged surface sites for the association with oppositely charged polyelectrolyte segments.

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