Networks of surfactant-made physical organogels
Thermoreversible networks can be formed from associated small molecules in appropriate organic solvents. The present paper reports on the use of neutrons and x-ray scattering techniques to probe the structural features of the colloidal aggregates constituting the gel networks and on rheological experiments which characterize some of the dynamic and semi-static properties. Four types of gel systems, characterized by the nature of their junction zones, are discussed. Depending upon the chemical constitution of the gelators, fibers, semi-rigid molecular threads and rods can be formed and give, above the overlap threshold (of the order of 0.5–1%), gels with high yield stress values, pseudo-plastic fluids or thixotropic gels, respectively. The specific examples of 12-hydroxystearic acid (HSA), cholesteryl anthraquinone-2-carboxylate (CAQ), binuclear copper (II) tetracarboxylate (Cu2S8) and a trisubstituted metalloporphyrin, zinc (II) 5-(p-carboxyphenyl)-10, 15, 20-tris(p-hexadecyloxycarbonylphenyl) porphyrinate, (ZnP3), are discussed.
Key words61.12E-Neutron scattering technqieus 82.70D-Colloids
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