2D Phase Transitions in Langmuir Monolayers of the Aromatic 4‘,5‘-Diphenyl-1,1‘:3‘,1‘ ‘-terphenyl-4-carboxylic Acid
| Autor: | and Anantharaman Dhanabalan, Patrycja Dynarowicz-Ła̧tka,†,‡, Osvaldo N. Oliveira |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Phase transition Langmuir Aqueous solution Carboxylic acid Surfaces and Interfaces Condensed Matter Physics Ion chemistry.chemical_compound chemistry Terphenyl Monolayer Electrochemistry Organic chemistry Physical chemistry General Materials Science Fourier transform infrared spectroscopy Spectroscopy |
| Zdroj: | Langmuir. 16:4245-4251 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la990614l |
| Popis: | Langmuir monolayers of 4‘,5‘-diphenyl-1,1‘:3‘,1‘ ‘-terphenyl-4-carboxylic acid (in short DTCA) were studied under different experimental conditions. The π−A isotherms displayed a broad plateau on a pure water subphase and two plateaus on a neutral aqueous subphase containing Cd2+ ions. DTCA monolayers were transferred as LB multilayer films and characterized by FTIR, X-ray diffraction, and electric surface potential measurements. From the analysis of surface potentials for LB films transferred at surface pressures corresponding to different parts of the π−A isotherm it was possible to infer that molecular orientational changes are the probable cause for the plateau in the isotherm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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