Evaluation of structural change during surface pressure relaxation in Langmuir monolayer of zinc stearate by infrared external reflection spectroscopy
| Autor: | Junzo Umemura, Hiroshi Sakai |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Langmuir
Polymers and Plastics Relaxation (NMR) Analytical chemistry Infrared spectroscopy Surface pressure Condensed Matter::Materials Science chemistry.chemical_compound Colloid and Surface Chemistry chemistry Stearate Monolayer Physics::Atomic and Molecular Clusters Materials Chemistry Zinc stearate Carboxylate Physics::Chemical Physics Physical and Theoretical Chemistry |
| Zdroj: | Colloid and Polymer Science. 286:1637-1641 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/s00396-008-1939-2 |
| Popis: | In situ polarized infrared external reflection spectra of the Langmuir monolayer of zinc stearate on a water surface were recorded during surface pressure relaxation, and the molecular structure of the monolayer was evaluated. The wavenumber of the antisymmetric methylene stretching band decreased during surface pressure relaxation. This result indicated that the shift to a highly compact packing of the hydrocarbon chain in the Langmuir monolayer occurred on a time scale of several minutes. Moreover, a wavenumber change in the antisymmetric carboxylate stretching band was observed. The O–C–O angle of the carboxylate group and the binding nature of the zinc cation to the carboxylate group appeared to have changed during the relaxation. The orientation angle of the molecule and the time scale of relaxation mechanisms were also discussed. |
| Databáze: | OpenAIRE |
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