Solvent-Induced Polymorphic Nanoscale Transitions for 12-Hydroxyoctadecanoic Acid Molecular Gels

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• 作者：Songwei Wu ; Jie Gao ; Thomas J. Emge ; Michael A. Rogers
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：March 6, 2013
• 年：2013
• 卷：13
• 期：3
• 页码：1360-1366
• 全文大小：657K
• 年卷期：v.13,no.3(March 6, 2013)
• ISSN：1528-7505

文摘

12-Hydroxyoctadecanoic acid (12HSA) molecular gels have been reported to form self-assembled fibrillar network (SAFiNs) in organic solvents. For the first time, different polymorphic forms for 12HSA molecular gels have been reported. 12HSA, in alkanes and thiols, have a hexagonal subcell spacing (4.1 脜) and are arranged in a multilamellar fashion with a distance greater than the bimolecular length of 12HSA (54 脜). This polymorphic form corresponded to SAFiN with CGC less than 1 wt %. 12HSA, in nitriles, aldehydes, and ketones, have a triclinic parallel subcell (4.6, 3.9, and 3.8 脜) and interdigitation of the lamellar structure (38鈥?4 脜). This polymorphic form corresponds to a less effective sphereultic supramolecular crystalline network, which immobilizes solvents at CGC greater than 1.5 wt %.