Materials Literature
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The benthic diatom assemblages of the Westerschelde-estuary were studied by means of multivariate analysis. Two main groups and eight subgroups were distinguished. The relation with salinity and sediment composition was investigated. A clear relation between grain size and the distribution of the assemblages was found.
We present a simple analytic solution for the condition of constructive interference for light transmitted through an interferometer incorporating three ideally transparent layers of arbitrary thickness and refractive index. We also consider the effect of adding two metallic coatings to the outer surfaces of the inter…
Mono- and binuclear Rh and Ir complexes are easily obtained by reaction of sapphyrins with [{RhCl(CO)2}2] and/or [IrCl(CO)2(py)]. In these binuclear complexes (e.g., 1), the two [M(CO)2] fragments are no different sides of the ruffled 22 π-electron ligands. Complex 1 catayzes the hydrogenation of cyclohexenes.
Iron exists in Fe 2+ and Fe 3+ states in CaO–P 2 O 5 –Fe 2 O 3 glasses and they impart characteristic optical absorption bands that allow analysis of relative proportion of the two species. This communication reports the redox states of glasses melted under air, argon, and oxygen atmospheres and relates them to the di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of tris[bis(trimethylsilyl)amino]aluminum with ammonia and pyrolysis studiesK. J. L. Paciorek, J. H. Nakahara, L. A. Hoferkamp, C. George, J. L. Flippen-Anderson, R. Gilardi, and Wayde R. SchmidtCite this: Chem. Mater. 1991, 3, 1, 82–87Publication Date (Print):Janu…
The local structure and crystallization of amorphous GeTe (a-GeTe) were examined by means of Ge K-edge EXAFS. In a-GeTe, both Ge-Ge and Ge-Te bonds were observed to exist in nearest neighbors of Ge. The average coordination number around Ge is 3.7, which is close to the tetrahedral structure. A random covalent network…
To take advantage of the beneficial properties of advanced ceramics, it is necessary that their friction coefficient be reduced to an acceptable value. One method for achieving this goal is incorporation of a solid lubricant phase in the ceramic matrix. In this study, ceramic-matrix composites were fabricated by drill…
A new sodium vanadyl(IV) orthophosphate NaVOPO 4 has been synthesized by solid-state and hydrothermal method and characterized by single-crystal X-ray diffraction and magnetic susceptibility. It crystallizes in the monoclinic space group P 2 1 / c with a = 6.524(1), b = 8.455(4), c = 7.119(1), β = 115.29(1)°, Z = 4, R…
Alcoholysis of NbCl5 in EtOH gives a viscous solution of NbClx(OEt)5 –x which may be used to spin-coat optically transparent electrodes (indium tin oxide, ITO). The electrode is converted to Nb2O5 by immersion in 1 mol dm3 H2SO4. Electron microscopic examination of the resulting 5–10 µm thick films revealed extensive…
“Fulgides” is the name of succinic anhydrides with two substituted methylidene groups, at least one of which is a (substituted) arylmethylidene group. Fulgides show a photochromic property between open (colorless) and closed (colored) forms with no thermal transformation, and are therefore expected to be used as advan…
The mechanical properties of composite ceramics composed of 0 to 20 vol% of titanium diboride particles dispersed in an α‐alumina matrix were investigated. The alumina–titanium diboride composite powder was hot‐pressed at 1470°C for 20 min to achieve over 98.8% of the theoretical composite density. The strength and fr…
The structures of thin films formed by the silanes N-[2-(vinylbenzylamino)-ethyl]-3-aminopropyltrimethoxysilane (SAAPS) and γ-aminopropyltriethoxysilane (γ-APS) deposited onto mechanically polished zinc or mild steel from dilute aqueous solutions were determined using time-of-flight (TOF) SIMS and XPS. TOFSIMS gave st…
The adsorption isotherms of He on activated carbon fibres at 4.2 K have been determined gravimetrically. The He adsorption isotherms were of typical type I and were analysed by the Dubinin–Radushkevich plots, giving the micropore volumes which are greater than those obtained from the N2 adsorption isotherm at 77 K by…
Addressability and multimode activity of the dihydroazulene–anthraquinone conjugate 1 are investigated by photochemical and electrochemical techniques, establishing pH-dependent redox behaviour and dihydroazulene–vinylheptafulvene photochromism (1⇆2), enabling an electric current to be modulated by light-pulse-irradia…
This work deals with the global instability mechanism of solidification from melt. It leads to a wave theory for solving long-standing problems--the pattern formation of dendritic growth and the selection of the tip velocity. One of the most important results drawn from the present work is that the selection condition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical quartz microbalance monitoring of poly(vinylferrocene) electrodepositionA. Robert Hillman, David C. Loveday, and Stanley BruckensteinCite this: Langmuir 1991, 7, 1, 191–194Publication Date (Print):January 1, 1991Publication History Published online1 May 2002P…
Ultraviolet irradiation of aqueous solutions containing a high concentration (10 mmol dm–3) of [Mo7O24]6– in the presence of MeOH results in the formation of a diamagnetic blue species identified as two-electron reduced [Mo14O46]10–. The blue species was isolated as [NMe4]2[NH4]8[Mo14O46]· 8H2O. Its diffuse reflectanc…
The mixed valence compounds [NHEt3]2[NH2Me2][V12As8O40(HCO2)]·2H2O 1 and Na5[V12As8O40(HCO2)]·18H2O 2 containing isostructural V–O clusters with encapsulated formate ions and different electron populations, and their characterization are reported; in structurally related V–O clusters spin–spin coupling increases with…
Photochromism of a series of 1′-alkyl-3′,3′-dimethyl-6-nitro-8-alkanoyloxymethylspiro(2H-1-benzopyran-2,2′-indoline) derivatives (SPs) having different lengths of their alkyl chains has been investigated in didodecyldimethylammonium chloride–clay matrices; stable H (parallel type) and J (head-to-tail type) aggregates…
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