Peng Junxia, Xia Huiyun, Liu Kaiqiang, Gao Di, Yang Meini, Yan Ni, Fang Yu
Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), Ministry of Education, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, PR China.
J Colloid Interface Sci. 2009 Aug 15;336(2):780-5. doi: 10.1016/j.jcis.2009.04.055. Epub 2009 May 3.
As the first example of cholesterol derivatives, butane-1,4-dicarboxamide of di-cholesteryl L-alaninate has been shown to form water-in-oil type gel emulsions. The oils can be n-alkanes (7 < or = n < or = 10) and commercial fuels. Importantly, the preparation of the gel emulsions is a simple agitation process at room temperature, heating, cooling, addition of a co-solvent, or other additional procedures is not necessary. SEM, optical and con-focal laser scanning fluorescence microscopy measurements revealed the foam-like structures of the gel emulsions. Rheological studies demonstrated that these gel emulsions are mechanically stable, and exhibit typical viscoelastic properties. Surprisingly, the storage modulus, G' and the yield stress of the gel emulsions decrease along with increasing the volume ratio of the dispersed phase, water, a property different from the gel emulsions reported in the literatures. From the view point of application, the present gel emulsions are superior to others because of the simplicity in preparation and the non-ionic nature of the emulsifier, which will definitely benefit the practical applications.
作为胆固醇衍生物的首个实例，二胆固醇基L-丙氨酸丁烷-1,4-二甲酰胺已被证明可形成油包水型凝胶乳液。这些油可以是正构烷烃（7≤n≤10）和商业燃料。重要的是，凝胶乳液的制备在室温下是一个简单的搅拌过程，无需加热、冷却、添加共溶剂或其他额外步骤。扫描电子显微镜（SEM）、光学显微镜和共聚焦激光扫描荧光显微镜测量揭示了凝胶乳液的泡沫状结构。流变学研究表明，这些凝胶乳液具有机械稳定性，并表现出典型的粘弹性特性。令人惊讶的是，凝胶乳液的储能模量G'和屈服应力随着分散相水的体积比增加而降低，这一特性与文献中报道的凝胶乳液不同。从应用角度来看，本凝胶乳液因其制备简单且乳化剂为非离子性质而优于其他乳液，这肯定有利于实际应用。
