物理化学学报 >> 1996, Vol. 12 >> Issue (04): 302-309.doi: 10.3866/PKU.WHXB19960404

研究论文 上一篇    下一篇

两亲分子聚集相的扫描隧道显微镜研究

盖峥,杨威生,周维金   

  1. 北京大学物理系,技术物理系,北京 100871
  • 收稿日期:1995-06-19 修回日期:1995-09-01 发布日期:1996-04-15
  • 通讯作者: 杨威生

Scanning Tunneling Microscopy Investigation of the Aggregation Phases of Amphiphile Molecules

Gai Zheng,Yang Wei-Sheng,Zhou Wei-Jin   

  1. Department of Physics,Department of Technical Physics,Peking University,Beijing 100871
  • Received:1995-06-19 Revised:1995-09-01 Published:1996-04-15
  • Contact: Yang Wei-Sheng

摘要:

用最近发展起来的局域探测手段─扫描隧道显微镜(STM)及其相伴的方法如局域功函数等,对具有十分丰富局域结构的两亲分子和水的两元系统的聚集相作了初步研究,以期为两亲分子研究及局域化学的发展添砖加瓦. 结果表明用STM可以真实地反映出各种聚集相的不同形貌,而且加上局域功函数像还可以揭示两亲分子的头尾取向.这对有机分子系统的局域结构的研究有普遍意义.

关键词: 扫描隧道显微镜, 两亲分子, 胶团, 介晶相, 生物膜

Abstract:

 In the present paper various aggregation phases of the binary system of an amphiphile, P507 and water have been studied by means of scanning tunneling microscopy (STM), local-barrier-heigh(Φ) images and the tip height as a function of bias voltage. The sample was prepared by spreading a thin layer of P507 water solution on the graphite substrate and left in air for natural drying. Three different lyotropic mesomorphic phases (lamellar, hexagonal and cubic phases) along with the spherical, disk-like and rod-like micelles were imaged on the sample surface. The geometric shape and dimension of these phases match nicely what speculated in previous papers. Combining information from the STM andΦ images we are able to tell if the hydrophilic part of the molecules of a phase is inward or outward. Besides, the mechanical characteristics of the aggregation phases, which might be responsible for many important functions of biological membranes, have also been studied.

Key words: Scanning tunneling microscopy, Amphiphile, Micelle, Lyotropic mesomorphic phase, Biological membrane