表面化学structure-of-micelle.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,Structure of micelles,Spherical,ellipsoidal,claval,Laminar,Cylindrical,The shape of micelles depends on the geometry of surfactants,Where V is the volume of the hydrophobic part of the surfactant,lc is the maximum expanded length of hydrophobic chain,and a0 is the area of the hydrophilic part.,When P0.33,spherical or ellipsoidal.,0.33P0.5,claval or cylindrical,0.51,laminar,The size of the micelle depends on the nature of the lyophobic part of the surfactant molecules.The radius of the spherical micelles is slightly less than the length of the constituent units.,For straight-chain ionic surfactants,the number of monomer units per micelle,m and the number of carbon atoms per hydrocarbon-chain,n,are approximately related as follows:,n 12 14 16 18,m 33 46 60 78,