Evaluation of molecular structure in Langmuir monolayers of zinc stearate and zinc 12-hydroxystearate by IR external reflection spectroscopy
| Autor: | Hiroshi Sakai, Junzo Umemura |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Langmuir
Polymers and Plastics Analytical chemistry chemistry.chemical_element Infrared spectroscopy Zinc Crystallography chemistry.chemical_compound Colloid and Surface Chemistry chemistry Stearate Monolayer Materials Chemistry Zinc stearate sense organs Carboxylate Physical and Theoretical Chemistry Methylene |
| Zdroj: | Colloid & Polymer Science. 280:316-321 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/s003960100581 |
| Popis: | In situ polarized Fourier transform IR external reflection spectra of Langmuir monolayers of zinc stearate and zinc 12-hydroxystearate on a water surface were recorded for various surface areas, and their molecular structures were estimated. In the zinc stearate monolayer, the wavenumbers and the absorbances of the antisymmetric and symmetric methylene stretching bands did not change during monolayer compression, which means that orientational and conformational changes of the hydrocarbon chain did not occur. However, wavenumber changes of the antisymmetric and symmetric carboxylate stretching bands were observed during surface compression. The change in the binding nature of the zinc cation to the carboxylate group was speculated. Moreover, it was elucidated that the structure of the hydrocarbon chain in the zinc 12-hydroxystearate monolayer was different from that in the zinc stearate monolayer. |
| Databáze: | OpenAIRE |
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