带电聚合电介质表面吸附理论研究  

The Study of polyelectrolyte adsorbent theory on a repulsive charged surface

作　　者：卢孟春[1] 郑勇林[1,2] 王晓茜[2] 戴松晖[2] 严刚峰[2] 

机构地区：[1]长江师范学院凝聚态物理研究所,重庆408100 [2]成都大学电子信息工程学院,成都610106

出　　处：《原子与分子物理学报》2013年第5期824-828,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金[11205022];重庆市教委科学技术研究项目[KJ061305;KJ081307]

摘　　要：应用聚合电介质吸附的定标理论,根据介质和表面电介质常数的比率,考虑多化合价吸附电介质之间强相关性作用,我们提出一种表面排斥电荷的近似定标理论方法,根据这种方法把电介质表面吸附层的相图分为本质上不同的两大类.从相图可知:当表面电荷密度低(或体带相反电荷离子密度高),这时表面和体带相反电荷离子密度几乎相同;一旦表面电荷密度足够高,就使带相反电荷的离子在表面上浓缩.据此,可确定在这个区域内,低化合价聚合电介质形成一个相关的多链状态,当化合价足够高时,由于近邻链之间的更强排斥增强,使状态转变成单链.Application scaling theory of polyelectrolyte adsorption, and according to ratio of the dielectric constant between the medium and the substrate, and take into account strong interaction between poly- electrolytes of multivalency adsorption, we proposed a scaling theory of the approximation method on a repulsive charged surface. It is divided into two kind phase diagrams that one are qualitatively different. This shows when the surface charge density is low （or the bulk counterion density is high）, the surface and the bulk counterion density are almost the same. Once the surface charge density is high enough, counterions condense on the surface. In this regime, polyelectrolytes of lower valency form a correlated many-chain state. As their valency is high enough, the state turns out to be single-chain because of stronger repulsion between neighboring chains.

关 键 词：电介质常数 聚合电介质 表面电荷 吸附理论 

分 类 号：O65[理学—分析化学]