含双疏水链阴离型两性分子单分子膜的聚集行为

单分子膜在水面上的聚集状态与膜分子的亲水基间的静电排斥作用和疏水基间Van der Waals引力的相对大小有关.在293K亚温度下,2C~nSN~a单分子膜聚集行为的电子显微研究表明,n=12时呈非晶性单分子;n=12时在较高的表面压下形成结晶性单分子膜;n=16时可在表面压为0mN.m^-1的情况下形成结晶性单分子膜.FT-IR和透射电镜对单分子膜聚集结构的解析结果相互一致.本文还讨论了压缩速度对单分子膜π-A等温线的影响.

Aggregation behavior of the monolayer of double hydrophobic chains containing anionic amphiphile

The aggregation structure of monolayer was determine by the balance of electrostatic repulsion among anionic hydrophilic groups and Van der Waals attraction among hydrophobic groups. The aggregating behavior of 2CnSNa monolayer indicated that when n = 12, an amorphous monolayer was formed in the whole compressing procedure; when n = 14, a crystalline monolayer could be formed at high surface pressure; when n = 16, a crystalline monolayer could be formed even at 0 mN.m-1 surface pressure. The results of TEM observation were in accordance with the results of FT-IR anal. The variation of p-A isotherm with the compression speed was also discussed.