| Abstract
| - Organogels of 12-hydroxystearic acid (HSA) have been investigated to emphasize solvent-dependentrelationships between rheological properties and nanostructures in this class of physical gels. Differentlength scales are considered: macroscopic with optical opacity, rheology, phase diagram data; nanoscopicwith small-angle neutron scattering experiments and molecular with 1H NMR data. HSA networks areshown to be rigid fibrillar networks with rigid junction zones and behave as elastoplastic materials. Shearelasticities, yield stresses, and deformation behaviors appear connected to the crystallinity of networksthrough the cross-sectional shapes of fibers. Kinetics of molecular aggregation and flowing properties arealso used to compare three classes of HSA gels (toluene, dodecane, nitrobenzene). The melting transitionsas well as the concentration dependence of yield stresses exhibit remarkable behaviors analyzed in acontext of molecular nanomaterials.
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