METHODS OF PREPARING CHLOROPHYLL a MULTILAYERS ON GLASS PLATES

Abstract— Preparative methods for forming chlorophyll a multilayers on glass plates were re-investigated in relation to deposition ratios, and by checking the stability of chlorophyll u in the multilayers spectrophotometrically and by thin-layer chromatography. The methods for measuring deposition ratios were also re-examined and the best conditions selected.     

Fundamental aspect and behavior of saturated fluorocarbons in glow discharge in absence of potential source of hydrogen

The glow discharge of a series of saturated fluorocarbons, C_nF_2n+2 (n = 1, 2, 4, 6, and 8), was studied with glass substrates which do not contain any hydrogen. It was found that the deposition rate was a function of the F/C ratio of the starting fluorocarbons. That is, fluorocarbons with higher F/C ratio, such as CF₄ and C₂F₆, hardly polymerized, while fluorocarbons with lower F/C ratio, such as C₈F₁₈, polymerized as well as C₂F₄. After plasma exposure, the surface of glass substrate was characterized by measurements of water contact angle, water droplet rolling-off angle, and ESCA. Although all saturated fluorocarbon plasmas could alter the surface more hydrophobic than before, the deposited materials from fluorocarbons with higher F/C were not stable. Also, in plasmas with high F/C fluorocarbons, i.e., CF₄ and C₂F₆, sputtering of the electrode material was observed. © 1992 John Wiley & Sons, Inc.     

Thermal behavior of ternary Sm2Fe17Nx magnets

The Mössbauer spectra of Sm₂Fe₁₇N_x, prepared by the nitrogenation of Sm₂Fe₁₇ powders in an ammonia and hydrogen atmosphere, were observed at elevated temperatures to shed light on the thermal behavior of nitrogen in the compounds Sm₂Fe₁₇N_x. It was found that there were large differences in thermal behavior between the starting Sm₂Fe₁₇, crystalline Sm₂Fe₁₇N_x (x≈1.7) and amorphous Sm₂Fe₁₇N_x(x～7). The thermal decomposition behavior of Sm₂Fe₁₇N_3.2, developed as one of the most promising hard magnetic materials, was found to be different under different atmospheres.     

Quantum Mutual Entropy Defined by Liftings

A lifting is a map from the state of a system to that of a compound system, which was introduced in Accardi and Ohya (Appl. Math. Optim. 39:33–59, 1999). The lifting can be applied to various physical processes.     

Photo-electrochemical properties of multi-layered thin films composed of chalcogenide and superionic conductor glasses

Multi-layered thin films, which consisted of metallic silver, GeSe₃ glass, and silver oxyhalide superionic conductor glass were prepared. Photo- and electrochemical reaction of metallic silver with the chalcogenide glass layer was studied by optical absorbance and cyclic-voltammetry. Photo-doping of silver through the superionic glass layer was observed using evaporated AgI---Ag₂MoO₄ film and it was partly undoped by electrochemical treatment. However, no photo-doping was observed for the cell consisting of a AgI---AgPO₃ dip-coated layer. The doped silver was dissolved into the GeSe₃ layer during the photo-doping process. However, it formed another intermediate compound layer (probably silver selenide) during the electrodoping process.     

Structure comparison between Th2Zn17-type and TbCu7-type Sm–Fe intermetallic compounds and their nitrides by means of 57Fe-Mössbauer spectroscopy

Samarium–iron intermetallic compounds were prepared by a melt spinning method with low and high wheel speeds, which resulted in a Th₂Zn₁₇-type and a TbCu₇-type structure, respectively. Structure comparison between these types was investigated for Sm–Fe intermetallic compounds and their nitrides by ⁵⁷Fe-Mössbauer spectroscopy.     

Mössbauer spectrometric study of ternary Sm2Fe17Nx(x>3)

Among the ternary rare earth-iron-nitrogen compounds, Sm₂Fe₁₇N_x, invented and refined by Asahi Chemical Industry Co., Ltd., shows high magnetic anisotropy, intrinsic coercivity and high saturation magnetization. Powders of Sm₂Fe₁₇, prepared by are melting method, were nitrided in a mixed gas of hydrogen and ammonia to get x=0≈8 samples /1.2/. These samples have crystal structure of Th₂Zn₁₇ and Fe atoms are estimated to locate in 6c, 9d, 18f, and 18h sites /2.3/. The Mossbauer spectrum of Sm₂Fe₁₇N_{3. z} showed several unique magnetic properties. For example, Q.S. due to Fe occupying 18h site shifted to the direction of minus velocity. The result indicates that the nitrogen sites are not only 9e but 3b. CEM spectra of Sm₂Fe₁₇N_x powders showed the doublet due to iron oxide indicating that the surface of Sm₂Fe₁₇N_x powders were oxidised /4/. but even if they were exposed to strongly oxidative atmosphere, the thickness of the oxidised layers increased little, resulting no effect to the magnetic properties and to the Mossbauer magnetic parameters of the bulk.     

Polyamide aus trans-2,5-Dimethylpiperazin und Bestimmung deren Feuchtigkeitsaufnahme

Ohne Zusammenfassung     

Lithium-ion-conductive polyethylene oxide based polymer electrolytes containing tris(pentafluorophyenyl)borane

For enhancement of lithium-ion transference number, lithium-ion-conductive polymer electrolytes have been prepared from polyethylene oxide (PEO), lithium salt of LiCF₃SO₃ or LiF, plasticizer of polyethylene glycol dimethylether (PEGDME), and anion receptor of tris(pentafluorophenyl)borane (TPFB). Transport properties of the resultant polymer electrolytes have been studied by AC impedance spectroscopy. As a result, lithium-ion transference number increased with increasing TPFB due to the restriction of anion conduction by the interaction between anion and anion receptor. Effects of anion receptor on transport properties are discussed.