Materials Literature
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Using an order-of-magnitude evaluation, a quantitative evaluation was performed of the natural and Marangoni convections produced in the melt during single-crystal growth by the floating zone method.The Reynolds number, which forms a standard for free interfacial velocity, was described as a function of the Grashof nu…
Abstract Phase separation dynamics during a reaction injection molding process of an elastomeric polyurethane was studied via FT‐IR and rheology. 4, 4′ methylenediphenyl isocyanate and 1, 4 butanediol were mixed with 50 wt% of a 2000 molecular weight poly(proplyene oxide)polyol catalyzed by dibutyltin dilaurate. A sma…
黒鉛炉AASでPbを定量する際に,マトリックス修飾剤としてPdを添加すると,Pbの吸光度が増大すると共に,Pbの出現温度が上昇し,灰化温度をより高い温度に設定することが可能となる.このPdの効果について,X線光電子分光法(XPS)を用いて検討した.Pbの塩酸溶液の場合,600℃でPbのほとんどがPbCl2として消失するが,これにPdを共存させると,600℃に加熱してもPbは減少しない.又,試料中のPdCl2は,加熱温度の上昇と共に還元されて金属Pdとなり,同時にPbも還元されることが分かった.このXPSの結果から,Pdを添加することによって,Pbは黒鉛炉の昇温過程でPd中に取り込まれるために,原子化段階以前のPbの消失が抑制される…
The height dependences of the lattice spacing of crystal-like structures have been studied in sedimentation equilibrium and in deionized aqueous suspensions by reflection spectrum measurements of monodisperse polystyrene spheres (85–264 nm in diameter). The lattice spacing increases linearly owing to the gravitational…
Rolling and recrystallisation textures of Fe–3% Si (HiB) were investigated in center and subsurface layer by the ODF‐method. Degree of cold rolling and recrystallisation time were varied. The results were compared with results obtained for low carbon steel and the mechanisms of texture formation were discussed. At the…
Electric breakdown strengths were measured using a quasi-uniform field spherical electrode assembly for polyethylene with and without an emission shield between the electrode and the polyethylene surface. The results show that the emission shield suppresses carrier injection from the electrodes and enhances the breakd…
Corrosion rates of AISI 1010 steel samples in coal-water slurries in the presence and absence of chromate, molybdate, and tungstate oxyanion inhibitors were determined by electrochemical and weight loss measurement techniques. The corrosion rates obtained by the electrochemical technique were generally higher than the…
Diaryldisulfides are formed in polar solvents by reaction of disulfurdichloride with aromatic ompounds activated by alkoxy substituents. Starting from 1,2-dialkoxybenzenes or 2,3-dialkoxynaphthalenes or from suitably substituted biphenyls cyclic bis or monodisulfides, the dibenzo or dinaphthotetrathiocines 2 and 3 and…
The existence of eight combinations of absolute spatial configuration, helix handedness and handedness of director tilt has been shown for ferroelectric liquid crystals induced by optically active dipole dopants (optically active diesters of 4,4″-terphenyl dicarboxylic acid). As in the case of individual ferroelectric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe europium(III) ion as luminescent probe: structural investigation of complexes between europium nitrate and two polyethersJean Claude G. Buenzli, Dominique Plancherel, and Georges Olivier PradervandCite this: J. Phys. Chem. 1989, 93, 2, 980–984Publication Date (Print):Jan…
We intended to show filtration characteristics of BMM for solutions containing HIV and to clarify membrane separation mechanism for HIV particles and to demonstrate an ideal membrane for HIV removal. The hollow fibers with mean pore sizes (2 γf) ranging from 10 nm to 105 nm were prepared from the cuprammonium solution…
The rate laws describing the dissolution of calcite in aqueous solution under conditions of pH <4 and >7 are established, and, for the first time, it is shown that under conditions of high mass transport, the reaction of H+ with CaCO3 is controlled by a surface process rather than by the rate of convection/diffusion i…
Previous statistical models, developed to predict the strength of loose fiber bundles and composite materials, have been applied to the problem of predicting the tensile strength of woven fabrics when the underlying strength distributions of the warp and weft threads are known. The woven fabric was first assumed to ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnd-to-end cyclization of a pyrene end-capped poly(bisphenol A-diethylene glycol carbonate)Sylvie Boileau, Francoise Mechin, Jose M. G. Martinho, and Mitchell A. WinnikCite this: Macromolecules 1989, 22, 1, 215–220Publication Date (Print):January 1, 1989Publication History P…
This paper presents the first investigation on the diffusion of electron-hole pairs (generated under cathode-ray excitation) as a function of activator concentration in the oxisulfides ${L}_{2}$${\mathrm{O}}_{2}$S:${\mathrm{Tb}}^{3+}$ with L=Gd, La, or Y. The diffusion was studied by measuring the energy efficiency of…
The perovskite-type layer compound NH3(CH2) 5NH3CdCl4 exhibits two structural phase transitions observed at Tc1 = 337 K and T2 = 417 K, respectively. These phase changes are studied by means of X-ray diffraction, X-ray diffuse scattering and Raman scattering experiments. Evidence is provided for the existence of a con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel melt-processable poly[(acyloxy)aloxane] as alumina precursorYoshiharu Kimura, Masaya Furukawa, Hideki Yamane, and Toshio KitaoCite this: Macromolecules 1989, 22, 1, 79–85Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published ini…
Abstract Synthesis and crystallographic data on 29 new phases in this family are given. A survey of the crystal chemistry of the complete family, containing 59 phases to date, is presented. The family contains at least seven structural variations, two of which are the pollucite, CsAlSi 2 O 6 and leucite, KAlSi 2 O 6 s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal EPR spectra of copper-manganese bimetallic ferrimagnetic chainsDante Gatteschi, Olivier Guillou, Claudia Zanchini, Roberta Sessoli, Olivier Kahn, Michel Verdaguer, and Yu PeiCite this: Inorg. Chem. 1989, 28, 2, 287–290Publication Date (Print):January 1, 1989Pu…
A range of poly(L-lactic acid) [L-PLA], poly(DL-lactic acid) [DL-PLA], polyglycolic acid [PGA] polymers and PLA-PGA copolymers were synthesized from lactide and glycolide. The effect of lactide type, catalyst concentration, reaction time and reaction temperature was studied. Intrinsic viscosity determination, gel perm…