低聚表面活性剂--两亲分子表面活性的突破

Ｇｅｍｉｎｉ表面活性剂将两个单链单头基普通表面活性剂在离子头基处通过化学键联接在一起,从而阻抑了表面活性剂有序聚集过程中的头基分离力,极大地提高其表面活性。针对当前为提高表面活性而进行的大量尝试而言,Ｇｅｍｉｎｉ表面活性剂是概念上的突破,因而被誉为新一代的表面活笥剂。由于这种特殊的分子结构,Ｇｉｍｉｎｉ表面活性剂通常生成比其单链单头基表面活性剂更低曲率的分子聚集体,这造成Ｇｅｍｉｎｉ表面活性剂水溶

Oligomeric Surfactant--A Breakthrough in Enhancing the Surface Activity of Amphiphilic Molecules

Gemini surfactants are made up of two identical amphiphilic moieties covalently connected at the level of the headgroups by a spacer group.By this way the separation between the polar headgroups within gemini surfactants is strongly decreased when they aggregate and thus the surface activity is greatly enhanced.Introduction of gemini surfactants is a breakthrough in concept compared with general test in enhancing surface activity of conventional surfactants,for example,addition of salt,increasing temperature or mixing anionic/cationic surfactants.Therefore,gemini surfactants were reputed as a new generation of surfactants by M J Rosen.Since such as a special molecular structure gemini surfactants tend to form in aqueous solutions aggregates of lower curvature than the corresponding"monomeric"surfactants,which results in an unusually high viscosity with increasing the concentration of gemini surfactants.