双柱胶体粒子与管状生物膜的相互作用  

The adhesion of two cylindrical colloids to a tubular membrane

作　　者：牛余全 郑斌[1] 崔春红[1] 魏巍[1] 张彩霞[1] 孟庆田[1] 

机构地区：[1]山东师范大学物理与电子科学学院,济南250014

出　　处：《物理学报》2014年第3期450-457,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11074151);国家重点基础研究发展计划(批准号:2011CB808100)资助的课题~~

摘　　要：本文采用Helfrich理论模型研究双柱胶体粒子与管状生物膜的相互作用.通过对柱状粒子与不同半径的管状膜吸附时的自由能分析发现,该体系存在具有较小包络角的弱吸附相以及具有较大包络角的深度吸附相.进一步研究发现体系从解吸附相到弱吸附相的相变是二级相变,而从弱吸附相到深度吸附相的相变是一级相变.双柱粒子与管状膜相对位置的不同会影响体系相变和结构.The adhesion of two cylindrical colloids to a tubular membrane is investigated theoretically in terms of the full treatment of Helfrich model. By analyzing the free energy of the system, it is found that this adhesion can produce both shallow wrapping with relatively small wrapping angle and deep wrapping with big wrapping angle. A second-order adhesion transition from the desorbed to weakly adhered state is found, and a first-order phase transition where the cylindrical colloids undergo an abrupt transition from weakly adhered to strongly adhered state can be obtained as well. Different relative positions between rigid cylinders and membrane tube will affect the phase transition and structure of the system.

关 键 词：Helfrich理论 相变 自由能 管状膜 

分 类 号：Q73[生物学—分子生物学]