Materials Literature
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Simply dipping polyethyleneimine-modified surfaces into aqueous solutions of acid-functionalized Au55 clusters generates two-dimensional hexagonal and cubic arrangements of the clusters. The picture shows the transmission electron micrograph of the cubic arrangement; the bar length corrsponds to 10 nm.
Various segmented polyurethane materials with a polyurethane hard segment (HS) content of 40 wt % were prepared by bulk polymerization of a poly(tetramethylene ether) glycol with Mn of 2000, 1,4-butanediol, and various diisocyanates. The diisocyanates used were pure 4,4′-diphenylmethane diisocyanate (MDI), 2,4-toluene…
Simply dipping polyethyleneimine-modified surfaces into aqueous solutions of acid-functionalized Au(55) clusters generates two-dimensional hexagonal and cubic arrangements of the clusters. The picture shows the transmission electron micrograph of the cubic arrangement; the bar length corrsponds to 10 nm.
The strongest antiferromagnetic coupling to Gd(III) so far reported was found for the complex [Gd(Hbpz(3))(2)(dtbsq)] small middle dot2 CHCl(3) (1; Hbpz(3)=hydrotris(pyrazolyl)borate; dtbsq=3,5-di-tert-butylsemiquinonato; see structure). At 245 K the magnetic susceptibility of 1 is lower than expected for two uncorrel…
Bridging azido ligands transmit both ferro- and antiferromagnetic interactions. The sheetlike structured complex [Ni(µ-N(3))(2)(N,N-Et(2)-N'-Me-en)](n) (see picture) exhibits a range of magnetic behaviors at low temperature. Short-range ferromagnetic and three-dimensional antiferromagnetic ordering compete, giving met…
Epidermis has a thickness of 0.07 to 1.4 mm and serves to protect the body surface against physical and ultraviolet injury, to provide a barrier to water and chemicals, and to resist microbial penetration. The presence of disulfide bonds within the keratin layer and the desmosomal attachments between the epithelial ce…
Metal-containing silsesquioxane derivatives provide new catalysts with both homogeneous and heterogeneous applicability. The steric and electronic properties of silsesquioxane silanolate ligands render metal centers more Lewis acidic than conventional alkoxide or siloxide ligands do. This concept has been exploited in…
The emission of electromagnetic waves from a source within or near a non-trivial medium (with or without boundaries, crystalline or amorphous, with inhomogeneities, absorption and so on) is sometimes studied using the reciprocity principle. This is a variation of the method of Green's functions. If one is only interes…
The polyurethane composites with conducting carbon black (CB) were prepared by a solution-precipitation process, which was followed by melt compression molding. The polyurethane used has good shape memory effect. The morphology of CB fillers in polyurethane matrix and the resulting conductivity of the composites were…
A practical approach of transferring a hexagonal array of nanosized pores produced in porous alumina into silicon and other substrates is discussed. The alumina pores have dimensions of 25–250 nm pore diameters and 50–300 nm pore spacings depending on the anodization conditions used. The characteristics of the alumina…
The Landau-Ginzburg theory of ferroelectricity predicts the intrinsic coercive field for polarization reversal, but the observed extrinsic coercive field is always much smaller as a result of nucleation, dynamic processes not covered by the static theory. We have realized the intrinsic coercive field for the first tim…
The ordinal name Helotiales Nannfeldt, in common use for over 60 years, was not validly published, since it was based on an invalidly published family name, Helotiaceae Rehm.Rehm's family name has recently been conserved, but since the ordinal name is still technically incorrect, steps are taken here to validate it.
Theoretical background of bridging bond formation of dissimilar metal atoms mediated by an oxygen atom is given for the system Ca(OH)2-SiO2. Physicochemical significance of low coordination state is emphasized in conjunction with higher reaction probability. A solid state addition reaction at room temperature is shown…
Problematics, choice of adequate calculational scheme and obtained results in the first-principles simulations of potassium niobate (in different ferroelectric phases), pure and Li-doped potassium tantalate, and lithium niobate are discussed. The ferroelectric instability, zone-center TO phonons, and crystallographic…
It is necessary for material suppliers to know a relationship between specifications of device and those of materials used, in order to develop a suitable material for the target device. A computer simulation is one of the effective methods for this purpose. In this paper, an example of static magnetic field analysis…
Rhombohedral phase of pressure-temperature treated C60 polymer was investigated by resistivity, X-ray diffraction and ESR measurements. The pure rhombohedral phase of C60 polymer displays highly anisotropic electrical properties, and the conductivity in the polymerized 2D plane exhibits a metallic feature with weak lo…
牛皮不溶性コラーゲンを亜臨界水処理および酵素処理をすることより加水分解し, 異なる分子量のコラーゲンポリペプチドを得た. これらのポリペプチドの活性水素に2-メタクリルオキシエチルイソシアナート (MOI) を反応させて二重結合を導入したポリペプチド (PEP-MOI) を合成した. MOIの導入率は, 高分子量のポリペプチドほど高かった. PEP-MOIは容易に単独重合し, メタクリル酸メチル (MMA) と共重合した. PEP-MOI水溶液に接触させたポリスチレン (PSt) フィルム表面を紫外線照射することにより, PStフィルム表面にコラーゲンポリペプチドを容易にグラフトすることができた. グラフトしたコラーゲンポリペプチ…
The effects of ultraviolet irradiation on three-step coloring film were investigated through TEM observation and the measurement of chromaticity and of the metal content. TEM observation revealed that ultraviolet irradiation apparently decreases electrodeposits in the DC anodic oxidation film. Metals that had electrod…
本報では, 未延伸および幅拘束1軸延伸したフィルムに熱処理, 熱水処理を施し, 結晶化度の値をいろいろと変化させ, これらフィルムの引っ張りによる応力-ひずみ曲線を検討する. ポリエチレンテレフタラート (PET) のフィルムは温度80℃附近で延伸が行われるので, 未延伸フィルムでは, 室温とこの温度による応力-ひずみ曲線を解析した. また, 幅拘束1軸延伸フイルムのOff-axis angle再延伸は室温で行っているので, この後者は, 室温での応力-ひずみ曲線を解析した. 以上の結果により, PETの未延伸, 幅拘束1軸延伸フィルムの結晶相, 非結晶相の値列モデルにもとづき解析され, その結晶相, 非結晶相のヤング率および降伏…
X-ray photoemission spectroscopy (XPS) measurements were performed on SrTiO3 and BaTiO3 single crystals with monochromated Al Kα radiation. Valence band (VB) spectra of as-fractured SrTiO3 and BaTiO3 crystals exhibit two peaks arising from the O 2pπ and O 2pσ bonding orbitals. From a partial density of states (PDOS) c…