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| - Structural Study of Cholesteryl Anthraquinone-2-carboxylate (CAQ) Physical Organogelsby Neutron and X-ray Small Angle Scattering
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| - Physical organogels of cholesteryl anthraquinone-2-carboxylate(CAQ) and an organic liquid have been studiedby small-angle neutron and X-ray scattering techniques. The gelstructure consists of long and rigid fibersof CAQ interconnected in swollen lyotropic microdomains. Thenature of the “junction zones” of the three-dimensional network is dependent upon the type of liquid component.In decane, they consist of bundles ofseveral hexagonal-like arrangements of cylindrical aggregates (diameterca. 102 Å). In alkane/alcohol mixtures,a merging process toward a more compact lamellar-like structure occursprogressively with increasing alcoholcontent. In pure 1-alkanols, the aggregates may have a morerectangular cross-sectional shape (ribbons).Schlieren optical textures confirm the inhomogeneity of theorientation of thread-like structures in thebirefringent materials. When the structural features of CAQ gelsare compared to those of other low-molecularweight gelators, the nature of the link between the cholesterol andanthraquinone moieties of CAQ appearsto influence the packing in the condensed state while the aromatic partdetermines the aggregation mechanismwhich leads to organogels.
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