摘要
用稀释法和电导测定法求得了阴离子表面活性剂 (SDS) -正己醇 -烷烃 -水或水溶液组成的w/o型微乳的结构参数 ,醇从连续相转移到界面层的自由能变化△G0c→i和活化能△E ,研究了烷烃碳原子数、温度及电解质浓度的影响 .结果表明 :△G0c→i与烷烃碳原子数n及ln△E与烷烃碳原子数n有如下线性关系 △G0c→i=- 5 .85 73+0 .36 87n ln△E =12 .34 6 1- 0 .2 784n在 30～ 45℃温度范围 ,结构参数与温度及△G0c→i与温度也有很好的线性关系 ,水核半径Rw 及颗粒有效半径Re 等随温度升高而变大 ,△G0 c→i降低 ,微乳液稳定性降低 ;当NaCl溶液浓度为 0 .0 10mol·L-1时 ,体系的自由能ΔG0c→i降低较大、活化能△E最大 ,且所形成的水核半径Rw 及颗粒半径Re 也是最小的 ,微乳液体系最稳定 .
The structural parameters,change of standard free energy for hexanol to transfer from the continuous phase to the interfactial membranes,and activation energies for SDS(sodium dodecyl sulfate) 1 hexanol alkane water or aquatic solution system were calculated by means of dilution method or measurment of electric conductivity.The effects of the cabon atom numbers of alkane,temperiture and salt were studied.In 30～45℃ range of temperature,the linear relationships exist between the structure paramiter or ΔG 0 c→i and the carbon atom number of alkane,too.At 0.010?mol·L -1 NaCl solution,the activation energe △E is maximum,the radius of inner water droplet R w and the effective radius of particle R e are minimum,the stability of the microemulsion is maximum.
出处
《云南大学学报（自然科学版）》
CAS
CSCD
2000年第2期126-130,共5页
Journal of Yunnan University(Natural Sciences Edition)
基金
云南省应用基础研究基金资助项目!( 98B0 14M )
关键词
W/O型微乳液
结构参数
电导率
活化能
自由能
w/o type microemulsion
structural parameter
dilution method
measurment of electric conductivity
change of standard free energy
activation ennergy
