Stable blue phase polymeric Langmuir-Schaefer films based on unsymmetrical hydroxyalkadiynyl N-arylcarbamate derivatives
| Autor: | Petri Ihalainen, A. B. Ivanov, I. N. Domnin, Emil Rosqvist, Sergey Yu. Vyazmin, Helge Lemmetyinen, A. S. Alekseev, Elina Vuorimaa-Laukkanen, Jouko Peltonen |
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| Rok vydání: | 2018 |
| Předmět: |
Diacetylene
Absorption spectroscopy Aryl technology industry and agriculture Metals and Alloys Substituent 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Monomer chemistry Monolayer Polymer chemistry Materials Chemistry Molecule Methylene 0210 nano-technology |
| Zdroj: | Thin Solid Films. 645:108-118 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2017.10.018 |
| Popis: | Unsymmetrical diynes containing N-arylcarbamate groups in the hydrophobic part and hydroxymethylene groups in the hydrophilic part of the molecules were synthesized and studied. The Langmuir monolayer formation process was followed by Brewster angle microscopy (BAM). The Langmuir-Schaefer monolayer films, transferred on solid substrates (quartz or Si), were investigated by absorption spectroscopy and atomic force microscopy (AFM). Four substances had 2 methylene groups in the hydrophilic part of the molecule (n) and 4 or 5 of these groups in the hydrophobic part (m). At the same time the aryl substituent had a hydrogen atom or a MeO group in the p-position of the benzene ring. After 20 min of UV irradiation the initially colorless monomeric films of all four compounds turned into stable blue phase polymeric films. The blue phase is unusual for alcoholic diacetylene derivatives. The BAM and AFM measurements demonstrated higher homogeneity of the films with a MeO group in the aryl substituent in comparison to the molecules with a hydrogen atom. The reasons for these different structural organizations as well as potential applications of stable blue phase polydiacetylene thin films are discussed. |
| Databáze: | OpenAIRE |
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