Dissertation Information for Kevin Lawrence CaranNAME:
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SCHOOL: ADVISORS: COMMITTEE MEMBERS: MPACT Status: Fully Complete Title: I. L-Cystine-derived thermoreversible aqueous gelators. II. Morphological and chemical studies on large and giant vesicles Abstract: "A family of compounds based on dibenzoyl-L-cystine ( 1 ), a colloidal gelator, has been synthesized in an effort to gain a greater understanding of aqueous physical gels. Eight of the 14 derivatives studied were found to immobilize aqueous media containing DMSO, three of which formed stable gels at less than 1 mM concentration. Gels from all of the new successful gelators formed faster, could be prepared at lower concentrations, and had higher shear storage moduli (G ' ) than 1 . Rheological measurements were analyzed by comparing G ' values of gels across a range of concentrations for each gelator. Thermal stability of gels was studied using temperature-sweep oscillation rheology, the ""ball-drop"" method, differential scanning calorimetry (DSC), and variable temperature (VT) NMR. The thermally induced transition between gel and sol was found to be gradual and non-precipitous. Additional modes of study included X-ray crystallography, light microscopy and scanning electron microscopy (conventional and cryo-HRSEM) which, along with VT NMR, provide evidence for polymorphic fibrous aggregated as the solid-like framework supporting these gels. |
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