Materials Literature
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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…
Abstract
Previously, we examined the imino proton relaxation of d(GGAATTCC) in order to characterize salt and polyamine effects on the base-pair opening kinetics of this oligonucleotide [Braunlin, W. H., & Bloomfield, V. A. (1988) Biochemistry 27, 1184-1191]. Here, we report salt-dependent measurements of the NMR behavior of t…
The surface viscosity of beer was investigated using rotational surface viscometry to obtain information on its role as a factor in beer foam stability. Beer proteins were also studied in relation to surface viscosity, adsorption onto air bubbles, surface tension, and foamability in order to reveal the effects of the…
Six major types of isotope separation methods which involve plasma phenomena are discussed. These methods are: plasma centrifuge, AVLIS (atomic vapor laser isotope separation), ion wave, ICR (ion cyclotron resonance), calutron, and gas discharge. The plasma phenomena in these major categories are described. An attempt…
Abstract The wash performance of three specific proteases (asp, lys/arg and glu specific, respectively) is demonstrated to be comparable to that of commercial unspecific detergent proteases (Alcalase® and Savinase®). A hypothesis for the high performance of these specific proteases is proposed. The influence of pH and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanization of radio frequency glow discharge modified expanded poly(tetrafluoroethylene) using (aminopropyl)triethoxysilaneDaniel J. Hook, Terrence G. Vargo, Joseph A. Gardella Jr., Kevin S. Litwiler, and Frank V. BrightCite this: Langmuir 1991, 7, 1, 142–151Publication Da…
Pointing out electron acceptor properties of viologens, the outlines of porphyrin-viologen systems, complexes of viologens with donors and polymeric viologens are described along with biological interest of viologens