Materials Literature
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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…
Abstract The tortuosities of fibrous media in the heretofore unexplored transition and ordinary regimes are computed using a Monte Carlo scheme based on the Einstein equation for random walkers. The model structure is that of fully penetrable cylinders (FPC) in a unit simulation volume. The mean square displacement te…
The 5f1→6d1 absorption spectrum of 231Pa4+ diluted in a single crystal of Cs2ZrCl6 has been measured at 4.2 K. Three bands corresponding to the 6d(Γ8g, Γ7g, and Γ′8g ) levels are assigned. Extensive vibronic structure has been observed for the lowest 5f→6d transition and this structure is compared to that recently rep…
A new ceramic joining technique has been developed that utilizes an exothermic combustion reaction to simultaneously synthesize the joint interlayer material and to bond together the ceramic workpieces. The method has been used to join SiC/SiC composites and dense SiC ceramics using TiC‐Ni powder mixtures that ignite…
The reactions of CuO, PbO, ZnO, ZnS, V2O5, PbTiO3, PbZrO3, and YBa2Cu3O7–x, with 1,1,1,5,5,5-hexafiuoroacetyl-acetone result in formation of the corresponding metal β-diketonates with etch rates of 1 µm min–1for mixed copper(I)/(II) oxide films.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental approach to elucidate the mechanism of ultrasound-enhanced polymer erosion and release of incorporated substancesL. S. Liu, J. Kost, A. D'Emanuele, and R. LangerCite this: Macromolecules 1992, 25, 1, 123–128Publication Date (Print):January 1, 1992Publication His…
Dispersion polymerization of pyrrole in absolute alcohol or water–alcohol mixtures using poly(vinyl methyl ether)(PVME) dispersant and FeCl3 initiator–dopant yields conducting polypyrrole (PPy) particles which after isolation and purification can be redispersed in water as well as in many common organic solvents to gi…