Yasushi Mori

Analysis of Rubbed Polyimide Films by Polarized Infrared Spectroscopy

Abstract Polarized infrared spectroscopy was applied to the analysis of rubbed polyimide films. N2 purge of a sample chamber and increased substrate thickness enhanced the detection sensitivity. Dichroic differences were measured for the rubbed polyimide films at varied translating speed of the rubbing roller and at varied substrate temperature. The results suggest that the orientation of the polyimide was enhanced by increased polyimide surface temperature brought about by the heat of friction or the external heat. Moreover, a correlation between the LC alignment and the orientation of the polyimide chains was revealed by the analysis of the dichroic difference of the rubbed polyimide films immersed in organic solvents and the LC alignment on the films.

Active vibration control of frame structures with a smart structure using magnetostrictive actuators

For active vibration control of buildings in Japan, new system alterative to current active mass dampers are required. Smart structures are candidates for the alternative systems. In order to investigate the possibility, a smart structure was tested for active vibration control of frame structures, in which bending moment of the columns was controlled by magnetostrictive actuators integrated into the columns. The actuators were installed in stages in the bottom part of the column of a H- section. The stages had a different section for effective integration of the actuators into the column, while they had the same bending stiffnesses of the column in the two lateral directions. Excitation tests were carried out for a 3-story building model of a 3.4 m height and a 1600 kg total mass by using a shaking table. In the building model, each column had 2 stages in its bottom part in the first story, and 4 actuators were installed in each stage of one column. Thus 32 actuators in total were used. The magnetostrictive actuator developed for the building model consisted of a magnetostrictive rod of a 40 mm length and a 20 mm diameter surrounded by a driving coil. The controllers for the building model were designed by the model-matching method and the H(infinity ) control theory to control the 1st-, 2nd-, and 3rd-mode responses, and both controllers were designed so that the system had a 15% damping ratio in all modes. Through the tests, it was shown that the smart structure could effectively reduce the responses of the building model, and the two control strategies had almost the same performance.

Denatured tris(quinolin-8-olato)aluminium: a new material for organic electroluminescent cells

Tris(quinolin-8-olato)aluminium (Alq3) was denatured by a heating process. The denaturation was followed with infrared spectroscopy, differential thermal analysis and elemental analysis. The denatured Alq3 showed electroluminescent (EL) characteristics no weaker than normal Alq3.

Boundary condition effects on field-induced deformation modes in polymer dispersed liquid crystals

Electric field-induced deformation modes, which are considered one of the causes of the hysteresis in the V-T response of polymer dispersed liquid crystal (PDLC), were investigated. We constructed model PDLC cells with varied alignment treatments at the interface of the liquid crystal droplets. The electric field-induced deformation modes of the liquid crystals in the model cells were analyzed by polarized microscope observations. Our results suggested a possible way to hysteresis-free PDLC devices.

The novel texture of a liquid crystal induced by poly-γ-benzyl-L-glutamate chemical reaction alignment (CRA) film

Poly-γ-benzyl-L-glutamate (PBLG) when treated with a silane coupling agent on a glass surface forms a molecular oriented film; a new liquid crystal texture induced by the α-helical structure of PBLG attached to the substrate surface is observed.

Preparation of monolayer of poly(γ-benzyl-L-glutamate) by chemical reaction on a silicon crystal surface

Poly(γ-benzyl-L-glutamate)(PBLG) reacts with a silane coupling agent on a silicon crystal surface to form a molecular oriented film; the reaction yield was determined to be 77% by X-ray photoelectron spectroscopy and the orientation of PBLG molecules attached to the substrate was interpreted based on the attenuated total reflection spectrum.

Wavenumber shift of more than 20 cm−1 on CO vibration spectrum caused by conformational difference on polymorph in 2-cyano-3-(3,4-methylenedioxyphenyl)-2-propenoic acid

Abstract X-ray analysis of two polymorphs of 2-cyano-3-(3,4-methylenedioxyphenyl)-2-propenoic acid ethyl-ester revealed the difference of cis—trans conformation of cyano group to carbonyl group through the fixed single bond. This difference affected the carbonyl group to the extent of 20 cm −1 shift in vibration and Raman spectrum.

Chemical Reaction Alignment

A concept and basic results are presented to achieve an organized molecular film for optical responses. The method has been discussed in terms of work(energy) for molecular orientation.