2-DIMENSIONAL CRYSTALLOGRAPHY OF AMPHIPHILIC MOLECULES AT THE AIR-WATER-INTERFACE

被引:183
作者
JACQUEMAIN, D
WOLF, SG
LEVEILLER, F
DEUTSCH, M
KJAER, K
ALSNIELSEN, J
LAHAV, M
LEISEROWITZ, L
机构
[1] BAR ILAN UNIV,DEPT PHYS,IL-52100 RAMAT GAN,ISRAEL
[2] RISO NATL LAB,DEPT PHYS,DK-4000 ROSKILDE,DENMARK
[3] WEIZMANN INST SCI,DEPT MAT & INTERFACES,IL-76100 REHOVOT,ISRAEL
来源
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH | 1992年 / 31卷 / 02期
关键词
D O I
10.1002/anie.199201301
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The advent of well-collimated, high-intensity synchrotron X-ray sources and the consequent development of surface-specific X-ray diffraction and fluorescence techniques have recently revolutionized the study of Langmuir monolayers at the air-liquid interface. These methods allowed for the first time the determination of the in-plane and vertical structure of such monolayers with a resolution approaching the atomic level. We briefly describe these methods, including grazing incidence X-ray diffraction, specular reflectivity, Bragg rods, standing waves, and surface fluorescence techniques, and review recent results obtained from them for Langmuir films. The methods have been successfully applied in the elucidation of the structure of crystalline aggregates of amphiphilic molecules such as alcohols, carboxylic acids and their salts, alpha-amino acids, and phospholipids at the water surface. In addition, it became possible to monitor by diffraction the growth and dissolution of the crystalline self-aggregates as well as structural changes occurring by phase transitions. Furthermore, the surface X-ray methods shed new light on the structure of the underlying ionic layer of attached solvent or solute species. Examples are given where singly or doubly charged ions bound to the two-dimensional (2D) crystal form either an ordered or diffuse counterionic layer. Finally, the surface diffraction methods provide data on transfer of structural information from 2D clusters to 3D single crystals, which had been successfully accomplished by epitaxial-like crystallization both in organic and inorganic crystals.
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页码:130 / 152
页数:23
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