X-ray crystal analysis of azomethine dyes, such as diethylamino substituted benzylideneanilines and their silicon chelates was investigated for the elucidation of the steric structure of benzylideneanilines having different substituents, and the relation between absorption spectra of those dyes and their steric structures. Crystal structures of benzylideneaniline derivative, hydoroxybenzylideneaniline derivative, and their silicon chelate were determined by X-ray crystal analysis. The molecular structures of benzilydeneaniline derivative and hydroxybenzylideneaniline derivative was almost planar. Two neighbor molecules in the crystal of hydroxybenzylidenaniline faced each other and their oxygen-oxygen bond lengths was identical to that of hydroxybenzylidenaniline having ordinary hydrogen bonding. For each dye, absorption spectrum in solution and diffuse reflection spectrum in solid were investigated. In a solution, the absorption spectrum of hydroxybenzilidenaniline derivative showed only a small red shift from benzilidenaniline derivative. In diffuse reflection spectra, on the other hand, hydroxybenzylideneaniline derivative had a new broad absorption peak, which was caused by hydrogen bonding in solid state. In the comparison of absorption spectra between silicon chelates and the corresponding ligands, the absorption maxima (λmax) of the chelates had greater red shift and absorption width than the ligands in both solution and solid. The absorption spectrum of sublimed amorphous film was similar to that of the solution, but the sublimed crystalline film showed a red shifted spectrum.
Organically modified silica gels were prepared from a mixed solution of Si (OEt) 4 (TEOS) and RMeSi (OMe) 2 (DSA : R=CH3 (Me), CH=CH2 (Vinyl), C6H5 (Ph)) by sol-gel process. The pore structure of the modified silica gels was investigated by N2 adsorption. The organically modified silica gels were formed at amount fraction of DSA (XD=DSA/ (TEOS+DSA)) of 0.3 or smaller. The amount of R groups introduced in the silica gels was increased with increasing XD. Me- and Vinyl-modified silica gels possessed higher micropore volume and pore diameter than that prepared from TEOS only. The adsorption isotherm of N2 on Ph-modified silica gels was altered from type I to type II with increasing XD, accompanying a decrease of specific surface area and micropore volume. These facts revealed that the pore structure of silica gel was changed by the introduction of R groups to DSA for the silica gels.
Amorphous CoFeSiB and FeNiCrSiB alloy powders were produced by a two-stage- quenching technique consisted of high-pressure-gas atomization and subsequent centrifugal spinning. These amorphous powders had flaky morphology with disk or ellipsoidal shape. Their thickness was small, 2-3μm, and aspect ratio was large, 10-300. And, these powders were small these powders exhibited soft magnetic properties with small coercive force. These powders were coated with silica for insulating and were annealed. Composite magnetic sheet was fabricated by the dispersion of these powders in polymers.These flakes were oriented in the polymers with their flat surface parallel to the plane of the sheet. These sheets were found to have excellent permeability and EMI characteristics in quasi-microwave band.