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arXiv 0808.3076cond-mat.soft
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C18单甘酯在疏水溶液中的相行为

Phase behavior of C18 monoglyceride in hydrophobic solutions

C. H. Chen, I. Van Damme, E. M. Terentjev

摘要:

本文采用一系列不同的技术来分析单甘酯在油中的物理性质和相变。与MG在水或水溶液体系中的许多研究相反,我们发现在不同浓度和温度下的相结构存在显着差异。通过向我们的基础MG/油体系中加入少量水,我们测试了表面活性剂头基的水合作用及其对相行为的影响。用量热法测定了相图,并记录了不同条件下相图的普遍特征。报告了两个有序相:反层状凝胶相和亚α结晶凝胶相。这个序列是非常不同的MG/水的结构,其最显着的特点是建立一个2D密集的六角顺序的甘油头在中间的反层状双层。通过温度扫描检查流变学,以证明凝胶化现象,这从冷却/有序化过程中的层状相的开始。

英文摘要:

We apply a set of different techniques to analyze the physical properties and phase transitions of monoglycerides (MG) in oil. In contrast to many studies of MG in water or aqueous systems, we find a significant difference in the phase structure at different concentrations and temperatures. By adding small quantities of water to our base MG/oil systems we test the effect of hydration of surfactant head-groups, and its effect on the phase behavior. The phase diagrams are determined by calorimetry and their universal features are recorded under different conditions. Two ordered phases are reported: the inverse lamellar gel phase and the sub-alpha crystalline gel phase. This sequence is very different from the structures in MG/water; its most striking feature is the establishing of a 2D densely packed hexagonal order of glycerol heads in the middle of inverse lamellar bilayers. Rheology was examined through temperature scans to demonstrate the gelation phenomenon, which starts from the onset of the lamellar phase during the cooling/ordering process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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