Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal rotational degrees of freedom in nematic liquid-crystalline side-chain polymersHarald Pleiner and Helmut R. BrandCite this: Macromolecules 1992, 25, 2, 895–901Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 Janu…
Polypyrrole films containing alkylammonium groups have been deposited on ITO transparent electrodes and platinum electrodes by oxidative electropolymerisation of an N-substituted pyrrole monomer. These polymers exhibit anion-exchange behaviour that has been assessed with ferricyanide ions. The incorporation of tetra-a…
The structural and functional properties of lysozymes genetically deamidated at positions 103 (N103D) and 106 (N106D) were studied by a protein engineering technique. The wild-type and mutant lysozymes were expressed in Saccharomyces cerevisiae and purified from the cultivation medium in two steps by cation-exchange c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of the crystallinity of poly(β-hydroxybutyrate-co-β-hydroxyvalerate) copolymers by inverse gas chromatographyW. J. Orts, M. Romansky, and J. E. GuilletCite this: Macromolecules 1992, 25, 2, 949–953Publication Date (Print):January 1, 1992Publication History Publis…
CALPHAD, Computer Calculation of Phase Diagrams, has made significant accomplishments since 1970’s. In this paper, some examples of phase diagrams obtained by the CALPHAD method are presented. Especially, the microstructure design based on CALPHAD for magnetic materials is reviewed. The historical meaning and prospect…
ひずみエネルギー密度関数 (W関数) は, ゴムの力学的性質を記述する物質特性関数であり, ゴム弾性研究の基本となる関数であるが, 特にカーボンブラック補強ゴムのそれは実用上も同補強ゴムが構造部材として使用される場合が多く, その際の変形•応力解析に際してこの関数形が直接必要になる. しかし, その関数形はまだ完全には解明されていない. この論文ではカーボンブラック補強ゴムに焦点を絞ってW関数の近似関数を提出し, それの実験による求め方, 近似精度について検討した. 単純な近似関数(1)は一軸拘束二軸変形試験のみから求めることができる. C2, C3, C5, Nは定数.W(I1, I2)=C5(I1-3)+C2(I2-3)+C3…
Liquidus phase relationships at H2O-saturated and -undersaturated conditions and 2 kbar in the systems Qz–Or–Ab (SiO2–KAlSi3Os–NaAlSi3Os), Qz–Or–Ab–Al2O3, and subsystems are compared and discussed. In the peraluminous systems (i.e. when melts are saturated with respect to mullite) the liquidus temperatures are lowered…
Cubic boron nitride ( c ‐BN) was synthesized by the decomposition of Mg 3 BN 3 under high pressure and high temperature. The minimum pressure for c ‐BN synthesis was 4 GPa, which was 1 GPa lower than that of the conventional catalytic process. The decomposition of Mg 3 BN 3 was observed only when H 2 O was added. Ther…
Previous investigators of the theory of balloon formation in over-end unwinding of yarn from cylindrical packages have made the simplifying assumption that the yarn is inextensible. In this paper, the balloon equations for a linear elastic yarn are derived, and numerical solutions of these equations for small values o…
We have studied culture conditions which facilitate the growth of stable, non-proliferating, human umbilical vein endothelial cell (HUVEC) monolayers. Gelatin and fibronectin coatings, with or without glutaraldehyde cross-linking, on both plastic and glass were investigated for initial attachment of HUVEC and growth c…
The fluorescence quantum yield of the aminomethyltetraphenylporphyrin–tin(IV) compound, 1a–h is strongly influenced by pH in a bimodal manner owing to photoinduced electron transfer and axial ligand exchange processes.
Satoshi Nakamura, Rikizo Aono, Shin Mizutani, Tomonori Takashina, William D Grant, Koki Horikoshi; The Cell Surface Glycoprotein of Haloarcula japonica TR-
Abstract A series of polyurethane block copolymers based on hydroxy‐terminated polydimethylsiloxane and poly(propylene glycol) soft segments of molecular weights 1818 and 2000, respectively, were synthesized. The hard segments consisted of 4,4′‐diphenylnethane diisocyanate and 1,4‐butanediol as the chain extender. Sam…
Abstract Some adducts of MgCl 2 and Lewis bases (or donors) B were examined, having a composition MgCl 2 · 2B, where B = Ethyl (Et) formate, Et acetate, Et propionate, Et benzoate, Et crotonate, acetone, 2‐butanone and EtOH. The crystallographic investigation of these adducts, carried out on polycrystalline powders an…
It has been shown that the position of the cupric band is affected very little either by changing the silica: soda ratio or by changing the time content while keeping the silica:soda ratio constant in the molar composition range 14.7-22Na 2 O, 12-20CaO, 66-73.3SiO 2 however, it shifts to a shorter wavelength as soda i…
Structural distortions which result in symmetry reduction in the sodalite family are discussed. Several observed symmetry reduction pathways are presented in terms of group-subgroup relationships, as well as with the help of irreducible representations. Emphasis is given to aluminate sodalites, which are characterized…
The electrochromic behaviour of α-[Fe(pc)] and [Fe(pc)Cl] has been studied, using cyclic voltammetry, electronic absorption spectroscopy and Mössbauer spectroscopy, the latter on 57Fe-enriched [Fe(pc)] films. [Fe(pc)] films have been shown to cycle reversibly ca. 103 times between neutral (blue) and reduced (purple-re…
The catalytic epoxidation by dioxygen with trans-dioxoruthenium(VI)tetramesitylporphyrin [Ru(O)2(tmp)] of the acetic esters of cholesterol, 3-epicholesterol and isocholesterol,† as well as of the 7α-epimer of the latter, is β-stereospecific. Substitution by a methyl group on C-6 of pregnenolone acetate results in redu…
The hexadentate ligand 2,2′ : 6′,2″:6″,2‴:6‴,2â�—:6â�—,2â�—′-sexipyridine (spy) forms double-helical binuclear complexes with transition metals, but 1:1 complexes with lanthanides; the photoactive complex [Eu(spy)(NO3)2][NO3] is obtained from the reaction of spy with europium(III) nitrate and has been structurally cha…
A combination of extended X-ray absorption fine structure (EXAFS) experiments and computer simulations has been used to probe the environments of cation dopants in three oxide systems of technological importance, viz. lithium niobate (a material with applications in non-linear optics), tin oxide (a component in some t…