胶质液体泡沫的微观结构研究

Investigation to Microstructure of Colloidal Liquid Aphrons(CLA)

采用衰减全反射傅里叶红外光谱(ATR-FTIR)技术和差示扫描量热分析(DSC)等手段,对组成为十二烷基醇聚氧乙烯(3)醚(AEO-3)/正癸烷/十二烷基硫酸钠(SDS)或Tween 80/水的胶质液体泡沫(CLA)体系的微观结构进行了系统分析,从分子水平上讨论了CLA和普通乳状液体系的相结构及表面活性剂与溶剂的相互作用.分析结果表明,CLA结构中正癸烷和水分别是独立的2相,且水相呈现出自由态、结合态和束缚态结构;随着油相与水相体积比的增大,自由水含量减少,水相的结合态和束缚态成分增加.通过与普通乳状液相比较,发现油溶性表面活性剂AEO-3有助于CLA的形成,这与单一表面活性剂组成的普通乳状液完全不同.

The microstructural characteristics of colloidal liquid aphrons （CLA） composed of polyoxyethylene 3 dodecyl ether （AEO-3）/n-decane/sodium dodecyl sulphate （SDS） or Tween 80/water were investigated using attenuated total reflectance Fourier transform infrared spectroscopy （ATR-FTIR） and differential scanning calorimetry （DSC）. The interaction of water or ndecane with SDS or AEO-3 in CLA and ordinary emulsions systems was analyzed at the molecular level. The results indicate that the aqueous and organic domains are separate at a molecular level. Both water and n-decane display three distinct states, free, interphasal and bound, respectively. Their relative amounts are found to depend on the volume ratio of organic phase to aqueous phase. The content of free water decreases with the increase of PVR, accompanying the interphasal and bound water to gradually increase. The mixed nonionic/anionic surfactants of AEO-3 and SDS contribute to the formation of CLA, which is distinct from the ordinary emulsion stabilized with only one type of surfactant.