高等学校化学学报2011，Vol.32Issue(11)：2598-2604,7.
层状液晶凝胶对微泡沫的稳定作用
Stabilizing Effect of Lamellar Liquid Crystal Gels on Microfoams
摘要
Abstract
Highly stable mierobubble dispersions with mean bubble diameter of less than 100 |xm were pre pared simply by nonionic surfactant of glyceryl monostearate( CMS) . The microstructure, phase transition and rheological properties on these colloidal systems were studied using optical microscopy, freeze fracture transmission electron microscopy ( FF-TEM) , differential scanning calorimetry ( DSC ) and a controlled stress rheo-meter in an attempt to explore its stabilization mechanisms. The experimental results reveal that the GMS molecules are adsorbed at the air/water interface, which results in the self-aggregate of lamellar liquid crystal gel phase. The rigid lamellar could arrest the Laplace-pressure-driven dissolution due to the ordered and tightly stacking of GMS molecules. The interfacial crystallization as well as the formation of a three-dimensional network of GMS in the continuous phase determines the stability against coalescence behavior of the microbub-bles. The stable microbubbles could sustain for more than 10 months without occurrence of phase separation and collapse. It is concluded that the stability of the microfoams prepared solely by GMS surfactant is attributed to the presence of lamellar liquid crystalline gels covered at the gas/liquid interface. The role of liquid crystal gel in stabilizing microfoams can be related to its effect on several mechanisms including hydro-dynamic drainage, mechanical strength of the liquid film and the diffusion rate of entrapped gas.关键词
微泡沫/稳定性/层状液晶/α-凝胶/聚凝胶Key words
Microfoam/ Stability/ Lamellar liquid crystal/ a-Gel/ Coagel分类
化学化工引用本文复制引用
燕永利,邓强,孟梅..层状液晶凝胶对微泡沫的稳定作用[J].高等学校化学学报,2011,32(11):2598-2604,7.基金项目
国家自然科学基金(批准号:21073140)和陕两省教育厅自然科学研究计划(批准号:2010JK789)资助. （批准号:21073140）
