Materials Literature
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Two new C21 steroids were isolated from the CHCl3 extract of the stem of Marsdenia tenacissima. On the basis of spectroscopic analysis and chemical methods, their structures were elucidated as 17β-tenacigenin B (2) and 3-O-6-deoxy-3-O-methyl-β-D-allopyranosyl-(1→4)-β-D-oleandropyranosyl-tenacigenin C (3). The structur…
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The following topics were dealt with: CMOS; gate dielectrics; high-k films; plasma doping; rapid thermal processing; ultra-shallow junctions; semiconductor materials; laser materials processing; diodes; oxidation; annealing; thermal processing equipment; pyrometry; radiation thermometer; vacuum photothermal processing…
The new generation of biomaterials focuses on the design of biomimetic polymeric materials that are capable of eliciting specific cellular responses and directing new tissue formation. Since Arg-Gly-Asp (RGD) sequences have been found to promote cell adhesion in 1984, numerous polymers have been functionalized with RG…
The role of refining intensity and specific energy in refining of softwood kraft fibre fractions was studied. Several paper properties can be improved by selective refining of fractions. The tensile strength-dewatering resistance relationship benefits from low-intensity refining of the long-fibre fraction. The specifi…
Pyrrolidine-fused chlorins carrying an N- or C-linked -galactose residue were prepared by 1,3-dipolar cycloadditions of meso-tetrakis(pentafluorophenyl)porphyrin to galactose-substi-tuted azomethine ylides.
The influence of a composition of initial phase-separated alkali borosilicate glass and its thermal treatment as well leaching conditions on the parameters of the porous glass structure are discussed. The results obtained by adsorption and conductivity methods, transmission electron microscopy and dilatometer techniqu…
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…