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


Dielectric properties of self-assembled layers of octadecylamine on mica in dry and humid environments
Authors:Benitez J J  de la Fuente O Rodriguez  Díez-Pérez I  Sanz F  Salmeron M
Institution:Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Consejo Superior de Investigaciones Cientificas (CSIC), Universidad de Sevilla, Spain.
Abstract:Atomic force microscopy operating in noncontact electrostatic force mode was used to study the interaction of water with films of alkylamines and alkylsilanes on mica. The films efficiently block water adsorption except in exposed mica areas, where it strongly modifies the mobility of surface ions. We also studied the molecular orientation of octadecylamine molecules forming monolayers and multilayer islands. In monolayer films the molecules bind to mica through the amino group, producing a positive contact potential relative to mica (dipole pointing up). In multilayer films the methyl and amino group terminations are exposed in alternating layers that give rise to alternating values of the contact potential. These findings correlate with low and high friction forces measured in the methyl termination and amino terminations.
Keywords:
本文献已被 PubMed 等数据库收录!
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