By Kyoji Kawasaki, Bjoern Lindmann, Hirofumi Okabayashi
The foreign Symposium on Colloid and Polymer technological know-how used to be held at Nagoya Institute of expertise, Nagoya, Japan, in October 1996. this system lined either the elemental elements in addition to technological purposes of micelles, microemulsions, monolayers, and biocolloids. distinct emphasis was once put on formation and dynamics of self-organized constructions, together with technical advancements, purposes, basic thought, and result of investigations.
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Additional info for Formation and Dynamics of Self-Organized Structures in Surfactants and Polymer Solutions
No similar oscillations in the force distance curve are observed when the surfaces are precoated with less charged polyelectrolytes. In these cases a strong swelling of the polyelectrolyte layer is observed once the surfactant concentration reaches a critical value (well below the cmc). Key words Polyelectrolyte-surfactant association - surface forces - steric forces - critical association c o n c e n t r a t i o n - adsorption forces [-1-6]. However, also factors influencing how easily a polyetectrolyte can bend around a micelle, such as the stiffness of the polyelectrolyte chain and possible crosslinks of chains, are important parameters [7-9].
The polyelectrolyte coated surface is uncharged, or in the case of A M - M A P T A C - 3 0 weakly positively charged, before SDS is added. When SDS associates with an uncharged polyelectrolyte layer it will result in a recharging of the interface which results in the development of an electrostatic double layer and a less favorable polyelectrolyte-surface interaction. Thus, the polyelectrolyte-surfactant association at the mica surface is counteracted by electrostatic forces. Instead, it is driven by the hydrophobic interaction between the surfactant tails.
2 cmc (D), and 2 cmc (*) by steric and electrostatic forces. However, we note that the compressed layer thickness becomes thinner at higher surfactant concentrations, indicating that some desorption of AM MAPTAC-30 takes place at these SDS concentrations. More details about the interactions between A M - M A P T A C - 3 0 coated mica surfaces in the presence of SDS will be reported in a forthcoming publication . A M - P C M A - I O and SDS When mica surfaces are immersed in a 5 0 p p m A M CMA-10 solution overnight the surface charge is completely neutralized by the charges on the adsorbed polyelectrolyte .