PHOTOINDUCED MOLECULAR REORIENTATION IN POLYMERS, LANGMUIR-BLODGETT FILMSAND LIQUID CRYSTALS

1996 ◽  
Vol 05 (02) ◽  
pp. 165-187 ◽  
Author(s):  
L.M. BLINOV
Keyword(s):  
Liquid Crystals ◽  
Room Temperature ◽  
Optical Recording ◽  
Side Chain ◽  
Molecular Reorientation ◽  
Langmuir Blodgett ◽  
Physical Mechanisms ◽  
Novel Technique ◽  
Liquid Solutions ◽  
Langmuir Blodgett Films

A review of the experimental data on a photoinduced molecular reorientation in various molecular guest-host systems (dyes in liquid solutions, liquid crystals and polymer matrices), side-chain polymers and Langmuir-Blodgett films (LBFs) containing light absorbing chromophores is presented. The photoorientation may be reversible or irreversible. It is accompanied by the photoinduced dichroism and optical anisotropy which is widely used for optical recording information. Special attention is paid to the photoassisted poling of polymers and LBFs, a novel technique that allows for the preparation of the stable photoelectrets at room temperature possessing very promising nonlinear optical properties. The physical mechanisms of the photoinduced molecular reorientation are discussed.

Preparation and Characterization of the Langmuir−Blodgett Films Made of Hairy-Rod Polyglutamates Bearing Various Chromophores in the Side Chain

Langmuir ◽  
1998 ◽  
Vol 14 (25) ◽  
pp. 7260-7266 ◽  
Author(s):  
Michiaki Mabuchi ◽  
Shinnen Kobata ◽  
Shinzaburo Ito ◽  
Masahide Yamamoto ◽  
Albert Schmidt ◽  
...  
Keyword(s):  
Side Chain ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Langmuir-Blodgett films of One-dimensional Nanowires composed of Amphiphilic Tetrathiafulvalenes and Electron Acceptor

2008 ◽  
Vol 1144 ◽  
Author(s):  
Yoko Tatewaki ◽  
Junko Takizawa ◽  
Tatsuya Hatanaka ◽  
Mutsumi Kimura ◽  
Hirofusa Shirai
Keyword(s):  
Electron Acceptor ◽  
Room Temperature ◽  
The Other ◽  
Water Interface ◽  
One Dimensional ◽  
Langmuir Blodgett ◽  
Electrical Conductivities ◽  
Air Water Interface ◽  
Langmuir Blodgett Films ◽  
Mixed Layers

ABSTRACTWe found that novel amphiphilic tetrathiafulvalene (TTF; 1) organized into supramolecular assemblies by the addition of electron acceptor 2,3,5,6-tetrafluoro-7,7'f,8,8'f-tetracyano-p-quinodimethane (F4TCNQ) at the air-water interface. The assemblies on the air-water interface can be transferred onto the surface of mica and the morphologies of transferred films were investigated by AFM. The morphology of Langmuir-Blodgett films strongly depended on the ratio between 1 and F4TCNQ. Film of 1:1 mixture of 1 and F4TCNQ formed nanoscopic wires having an average dimension of 5.0 (height) × 70 (width) × 3000 (length) nm. On the other hand, the film of 2:1 mixture of 1 and F4TCNQ showed the mixed domains of wires and flat monolayers. Thus, the completely charge-transferred complex (1+)(F4TCNQ-) formed one-dimensional nanowires having a micrometer length. Room temperature electrical conductivities of cast film for 1:1 and 2:1 mixed layers of 1 and F4TCNQ were 2.4 × 10−4 and 8.0 × 10−5 S cm−1, respectively.

Langmuir and Langmuir−Blodgett Films of Side-Chain Liquid-Crystalline Poly(maleic acid-alt-1-alkene)s

Langmuir ◽  
2001 ◽  
Vol 17 (1) ◽  
pp. 78-85 ◽  
Author(s):  
René P. Nieuwhof ◽  
Peter Kimkes ◽  
Antonius T. M. Marcelis ◽  
Ernst J. R. Sudhölter ◽  
Ricarda Opitz ◽  
...  
Keyword(s):  
Maleic Acid ◽  
Liquid Crystalline ◽  
Side Chain ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

PRESSURE EFFECT ON CONDUCTIVITY IN Au(dmit)2 LANGMUIR–BLODGETT FILMS

2002 ◽  
Vol 01 (05n06) ◽  
pp. 627-630 ◽  
Author(s):  
YASUHIRO F. MIURA ◽  
SHIN-ICHI MORITA ◽  
SHIN-HACHIRO SAITO ◽  
MICHIO SUGI ◽  
MASATO HEDO ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Room Temperature ◽  
Pressure Effect ◽  
Ambient Pressure ◽  
Superconducting Phase ◽  
Ac Magnetic Susceptibility ◽  
Temperature Resistance ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Resistance Decrease

The resistance of the Langmuir–Blodgett films of ditetradecyldimethylammonium- Au(dmit) 2( 2C 14- Au(dmit) 2) salt has been measured under hydrostatic pressure up to 0.7 GPa. The room-temperature resistance decreases with increasing pressure, reaching a 0.6-times smaller value compared to that at ambient pressure. The film under the pressure shows a clear resistance decrease below 1.4 K on cooling, while that under ambient pressure shows a blunt decrease below 0.85 K and it turns to increase below 0.65 K. These results suggest the existence of the pressure-induced superconducting phase together with the earlier results of the ac magnetic susceptibility measurement.

A Study of Phase Change in Langmuir-Blodgett Films of Mesomorphic Side-Chain Polymers

1994 ◽  
Vol 98 (10) ◽  
pp. 2608-2612 ◽  
Author(s):  
Louis Bosio ◽  
Patrick Keller ◽  
Lay-Theng Lee ◽  
Jean-Philippe Bourgoin ◽  
Michel Vandevyver
Keyword(s):  
Phase Change ◽  
Side Chain ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

Alignment of liquid crystals using Langmuir‒Blodgett films of unsymmetrical bent-core liquid crystals

2019 ◽  
Vol 46 (10) ◽  
pp. 1494-1504 ◽  
Author(s):  
Keerti Choudhary ◽  
R. K. Gupta ◽  
R. Pratibha ◽  
B. K. Sadashiva ◽  
V. Manjuladevi
Keyword(s):  
Liquid Crystals ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films
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