Materials Literature
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Sonoelectrochemistry, combination of ultrasound with electrochemistry is one of the front research fields of sonochemistry and electrochemistry. It can be used to synthesize nanomaterials efficiently. Many applications are based on cavition which motivates chemical reactions. There are two types of sonochemical reacto…
ポリ乳酸を, Diels-Alder反応による熱可逆結合で架橋することにより, 書き換え可能な形状記憶を実現するバイオプラスチックを開発した. ポリ乳酸に結晶部や水素結合を導入して固定相をもたせても優れた形状記憶性は得られなかった. ポリ乳酸とソルビトールから分岐状の末端ヒドロキシポリ乳酸誘導体 (前駆体) を合成し, ジイソシアネート化合物を用いて架橋化させると, 優れた形状記憶性および形状復元性をポリ乳酸に付与できることを確認した. さらに, Diels-Alder反応が可能な熱可逆結合をポリ乳酸に導入して架橋化, すなわち, 上記の前駆体にフラン基を導入することにより末端フラン変性分岐状ポリ乳酸誘導体を合成し, トリスマレイ…
従来のカチオン型電着塗料では, 「ビスフェノールA型エポキシ樹脂」を樹脂骨格とし, 水和官能基に「酸で部分中和したアミノ基」を, 「ブロックドイソシアネート硬化剤」と組み合わせ適用している。これにより優れた性能を発揮しているが, 同時に本質的限界も有している。この限界を超えるべく, 我々は, これまで塗料成分の析出のみに費やされていた電気エネルギーを, 析出以外の二つの電気化学反応にも利用することを試みた。すなわち, プロパルギル基からアレニル基への異性化反応を利用した架橋反応の制御とスルフォニウム塩の電解還元反応を利用した析出膜電気抵抗の制御である。その結果, 環境特性, 付き廻り性をはじめとする各種性能が飛躍的に向上でき, 上…
Although electrical trees in silicon rubbers, silicone rubbers have been observed, AC trees have many small branches and thus it is hard to measure it in 3D. In order to observe the patterns of AC trees, two-dimensional sample is used. The development mode of the tree has been classified into three modes; Just after g…
Vacancies and interstitial type dislocation loops of two fusion reactor candidate materials (V-4Cr-4Ti and F82H) after fission and fusion neutron irradiation were studied by positron annihilation lifetime spectroscopy. Fusion neutron irradiation was performed in the FNS of JAERI, and fission neutron irradiation was pe…
The mechanism and progress of oxidation of the pearlite phase of 1018 carbon steel in contact with a borate medium was monitored and characterized using the in situ electrochemical scanning tunneling microscopy (ECSTM) technique. The pearlite phase was identified by characteristic microstructure using a previous exper…
The investigation of the surface alignment of liquid crystal (LC) multilayers evaporated on photoaligned polyimide vertical alignment (PI-VA) film was carried out by means of the novel three-dimensional (3D) surface profiler. We report the first use of the surface profiler to visualize a microscopic image of the monol…
The synthesis and physical properties of pyranobenzopyran ring system have been studied as a core structure of novel liquid crystal (LC) compounds. Substituted pyranobenzopyrans having an alkoxy group on the A ring (benzene ring) exhibited smectic and nematic phase, those having a fluoro-substituted phenyl group on th…
Solutions of trichloroisocyanuric acid (TCI) in different organic solvents are commonly employed in the footwear industry to improve the adhesion of SBS (styrene-butadiene-styrene) rubber soles to polyurethane adhesive. To avoid the use of organic solvents in the chlorinating solutions, several water-based chlorinatin…
The special features of the dielectric properties and conduction of ferroelectric crystals of Pb 5 (Ge 1− x Si x ) 3 O 11 (0 ≤ x ≤ 0.67) solid solutions were studied. Permittivity anomalies close to the temperatures T 1 ≈ 260 K and T 2 ≈ 130 K, the appearance of relaxator behavior at x > 0.35, and critical behavior of…
Giant magnetostrictive micro-displacement actuator has some unique characteristics, such as big output torque and high precision localization which can be in the nanometer scale. Because the relation between input magnetic field and output strain of giant magnetostrictive micro-displacement actuator exhibits hysteresi…
Phenolic resin has the excellent properties of fire resistance, low smoke production during burning, and a good balance between its cost and mechanical properties compared with other types of resin used in fire-resistant polymers (FRPs). If phenolic resin can be employed as a matrix of FRP, such FRP can have a higher…
The products and the oxidative polycondensation reaction conditions of oligo-3-aminopyridine with H2O2 and NaOCl were studied. In this reaction, NaOCl was observed to be more active than H2O2 and optimum reaction conditions were determined. Oligo-3-aminopyridine (OAP) was synthesized from the oxidative polycondensatio…
A series of crystals of NaxTaS2 with different superconducting transition temperatures (Tc) ranging from 2.0–4.4 K wereobtained by flux method. The structural data deduced from X-ray diffraction pattern shows that the sample has the same structure as 2H-TaS2. Compared with the resistivity curve of un-intercalated samp…
We have investigated the influence of micrometer- and sub-micrometer-scale surface heterogeneities in patterned octadecyltrichlorosilane (OTS) films on human serum albumin (HSA) adsorption and its spatial distribution. 5-μm-wide OTS patterns were created on glass substrates by micro-contact printing and in some instan…
Tris[tetra(15-crown-5)phthalocyaninato]dilutetium(III) ( R 4 Pc ) 3 Lu 2 , whose structure had been confirmed earlier by X-ray analysis, was further examined by physicochemical studies. The redox properties of this complex were investigated by cyclic voltammetry. The spectroelectrochemical study of this compound has b…
A composite of Ti-V-based bcc phase alloy surface-modified by multiwalled carbon nanotubes (MWNTs) was prepared simply by a short-time ballmilling process. The composite sample showed remarkably improved electrochemical hydrogen release capacities. For the 30 min ballmilled sample, a discharge capacity of was obtained…
The n = 1 Ruddlesden–Popper phase Sr4FeMoO8 has been synthesised by high temperature ceramic methods under reducing conditions. Rietveld refinements of the structure against X-ray and neutron powder diffraction data shows that this phase adopts the space group I4/mmm (a = 3.92962(5), c = 12.6707(2) Å) and contains a c…
Investigations carried out on ferroresonant oscillations in a transformer-terminated line due to an energised parallel line on the same right-of-way are reported. A nonlinear approach is used for analysis. The magnetic saturation characteristic of the individual phases of the three-phase transformer is represented and…
We studied the effect of inverter surge voltage for high voltage electrical insulation by using steep fronted and high frequency high voltage pulse generator and model bar coils. In this experiment, we investigate the lifetime and partial discharge characteristics of insulation under surge voltage with various risetim…