首页 | 本学科首页   官方微博 | 高级检索  
     检索      

脂肪醇聚氧乙烯醚在空气-水界面上铺展单分子膜的脱附性质
引用本文:阳建斌,朱谱新,姚永毅,吴大诚.脂肪醇聚氧乙烯醚在空气-水界面上铺展单分子膜的脱附性质[J].原子与分子物理学报,2005,22(1):115-118.
作者姓名:阳建斌  朱谱新  姚永毅  吴大诚
作者单位:四川大学纺织研究所,成都,610065
基金项目:四川省应用基础研究项目(02GY029-048)
摘    要:采用Wilhelmy法测定脂肪醇聚氧乙烯醚在空气-水界面上铺展单分子膜的动态表面压,并由此计算动态脱附动力学参数.实验结果表明,样品铺展膜的脱附初期扩散系数约10-3~10- 4cm2/sec,远远大于溶液表面吸附的扩散系数,铺展膜的初始表面浓度越大,其初期脱附扩散系数也越大.但是从脱附整个过程看,铺展膜的初始表面浓度越大,其平均脱附速率常数越小,脱附过程是属于扩散控制和表面能垒控制共同作用的混合模式.

关 键 词:脂肪醇聚氧乙烯醚  单分子膜  动态Wilhelmy法  脱附  扩散系数  速率常数
文章编号:1000-0364(2005)01-0115-04
收稿时间:2004/3/15

Desorption properties for spreading monolayer of a poly (ethylene oxide) alkyl ether at Air-water interface
YANG Jian-bin,ZHU Pu-xin,YAO Yong-yi,WU Da-cheng.Desorption properties for spreading monolayer of a poly (ethylene oxide) alkyl ether at Air-water interface[J].Journal of Atomic and Molecular Physics,2005,22(1):115-118.
Authors:YANG Jian-bin  ZHU Pu-xin  YAO Yong-yi  WU Da-cheng
Abstract:The dynamic desorption process of a poly (ethylene oxide) alkyl ether, C18H37O(CH2CH2O)_(20)H, in spreading monolayer was measured using dynamic Wilhelmy plate technique at air-water interface. The initial desorption diffusion coefficients o the sample were calculated being about 10-3~10-4 cm2/sec, which are much higher than that of the opposite process in which the sample molecules adsorb from solutions to the surface. However, the bigger the initial surface concentration of the spread monolayer is, the smaller is the average rate constant. It was showed that the desorption process is controlled by a mixed mechanism including both diffusion-controlled and surface energy barrier controlled.
Keywords:Poly (ethylene oxide) alkyl ether  Dynamic Wilhelmy technique  Spreading monolayer  Desorption  Diffusion coefficient  Rate constants
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《原子与分子物理学报》浏览原始摘要信息
点击此处可从《原子与分子物理学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号