Direct Imaging of a collapsed Langmuir monolayer and multilayer formation

TitleDirect Imaging of a collapsed Langmuir monolayer and multilayer formation
Publication TypeJournal Article
Year of Publication2008
AuthorsSeok S, Kim D, Kim TJ, Kim YD, Vaknin D
Journal TitleJournal of the Korean Physical Society
Volume53
Pages1488-1491
Date Published09
Type of ArticleProceedings Paper
ISBN Number0374-4884
Accession NumberISI:000259194800038
Keywordsellipsometry, fatty acid, films, imaging ellipsometry, isotherm, langmuir monolayer
Abstract

Imaging ellipsometry was used to investigate the collapsed region of arachidic-acid monomolecular layers spread on the surfaces of pure water and a CaCl2 solution. We could observe the domain image of a collapsed region caused by over-compressing the Langmuir monolayers beyond the minimal closely-packed molecular area. The thicknesses of the layers obtained from the analysis were approximately integer multiples of the molecular lengths, accounting for the small tilt from the surface normal direction. The thickness of the collapsed region is proposed to depend sensitively on the existence of salt in the water subphase.

Alternate JournalJ. Korean Phys. Soc.