Determination of the Thickness and Optical Properties of a Langmuir Film from the Domain Morphology by Brewster Angle Microscopy
| Autor: | J. Adin Mann, and Marc N. G. de Mul |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Brewster's angle
Condensed matter physics business.industry Chemistry Bilayer Surfaces and Interfaces Dielectric Disclination Condensed Matter Physics symbols.namesake Optics Microscopy Monolayer Electrochemistry symbols General Materials Science Texture (crystalline) business Anisotropy Spectroscopy |
| Zdroj: | Langmuir. 14:2455-2466 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la9713154 |
| Popis: | A method employing Brewster angle microscopy was developed to measure the relative thickness of monolayers and multilayers at the air−water interface. Results proved that multilayers in ultrathin films of 8CB (4‘-n-alkyl[1,1‘-biphenyl]-4-carbonitrile; nCB, n = 8) are built up from one or two stacked bilayers on top of a monolayer at the air−water interface covered by a continuous bilayer. In addition, the fan texture of the mixed splay-bend disclination defects, which are formed in 10CB monolayers on reverse collapse of a continuous trilayer, was used to obtain estimates for the components of the anisotropic dielectric constant of the monomolecular film. This estimate was made by comparing experimental images with computationally generated model images based on an assumed director distribution around the defect. The results support the validity of the folding mechanism of multilayer generation and reverse collapse as opposed to the condensation mechanism. Finally, comparison of the experimental and theore... |
| Databáze: | OpenAIRE |
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