Quasi-Liquid Crystalline Materials with Special Electro-Optic Properties.
Periodic rept. nos. 1-5, Dec 85-Nov 87,
WEIZMANN INST OF SCIENCE REHOVOTH (ISRAEL)
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In the research proposal submitted to the European Research Office of the US Army we have described a new type of organic material, quasi-liquid crystals QLCs obtained by us from thermochromic spiropyrans with mesogenic substituents. We have defined some basic properties of the material, that can be of practical importance. During the past two months the studies on QLCs have been concentrated on further investigation of the structure of this new material. For structural studies the thin films of QLCs were aligned in the electrostatic field. We examined polarization absorption spectra of the films in the UV and visible regions and polarization ESR spectra. Recently the FTIR technique was used for IR observation of polarization of different groups in the spiropyran molecules aligned in the films. We used different coloured and fluorescent additives as probes in absorption and emission spectroscopy and a paramagnetic probe in ESR studies.
- Atomic and Molecular Physics and Spectroscopy
- Electrooptical and Optoelectronic Devices