Materials Literature
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A review is presented of microhardness tests applicable to plastics. The methods are outlined and the effect of test variables considered. Published literature describing applications of microhardness measurements to plastics including structure and environmental resistance are reviewed.
A series of [3]- and [4]-dendralenes, functionalised with 1,3-dithiole groups, are synthesised and shown by cyclic voltammetry to undergo reversible multi-stage redox reactions to yield tri- and tetra-cation species, respectively; the X-ray crystal structure of a [3]-dendralene derivative is reported.
Abstract A formula to compute total elastic Mott cross‐sections as well as a tabulation of the constants to compute total Mott cross‐sections for 94 elements are presented herein. This formula and the constants have been obtained from the values of total elastic Mott cross‐sections computed by Czyżewski et al. (1990)…
The use of the typical ABC equivalent circuit for one cavity in solid dielectrics for internal partial discharge modelling has been common practice for many years. The introduction of an equivalent circuit for two closely coupled cavities permits the investigation of the interaction between discharges in such cavities…
Upon doping with C60–C70(75 : 25 by mole) or by C60(>99%) in N-methylpyrrolidin-2-one–toluene solution at room temperature, conductivities of the emeraldine base of polyaniline as free-standing solution-cast films were found to increase significantly toca. 10–4 S cm–1 at a fullerene content of ca. 1 mol%.
A new test for estimating the adhesion of paints to metal substrates is presented. Small painted disks are immersed in N-methyl pyrrolidone (NMP) at 60°C and the time for the paint film to dclaminate completely and intact from the substrate is recorded. This time, termed the NMP paint retention time or NMPRT, is shown…
A series of aroylhydrazinato-nickel(II) and -copper(II) complexes have been synthesised in high yield and shown to form a new class of metallomesogens, which form smectic C and nematic phases; the nickel(II) complexes were found to be highly stable even in the isotropic phase, which contrasted with the rapid decomposi…
Vinyl polymers containing oligothiophenes, e.g. 2,2′ : 5′,2″-terthiophene and 2,2′ : 5′,2″ : 5″,2‴-quaterthiophene, as pendant groups have been found to constitute a novel class of potential electrochromic materials. The electrochemically doped polymers undergo reversible, clear colour changes from bluish purple to pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew strontium borate halides: Sr5(BO3)3X (X = F, Br)Theodore Alekel III and Douglas A. KeszlerCite this: Inorg. Chem. 1993, 32, 1, 101–105Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://pubs.acs.or…
Hydrogen bonding between ions has been used to engineer specific structural features into two novel crystalline materials with nonlinear optical properties, (S)-1-phenylethylammonium 3-hydroxybenzoate and (S)-l-phenylethylammonium 4-hydroxybenzoate; their crystal structures are reported and the importance of their hyd…
The operation of water reactor nuclear power plants provides a significant fraction of the world's electric power generation. At the end of 1992, approximately 360 such plants were in operation, representing a total generating capacity of 320 GWe. As these plants age, and as new designs evolve, the impact of environme…
The symmetry of the graphite crystal implies that each carbon atom has an electric quadrupole moment associated with it. This atomic moment may have a significant influence on the location of adsorbed molecules on a graphite surface and on the adsorption energy. A novel experiment, involving the measurement of the eff…
Various pure and yttrium-containing alumina aerogels have been synthesized and characterized by different techniques. The presence of yttrium promotes the thermal resistance of solids, as demonstrated by X-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET) surface measurements. Yttrium allows the aerogel structure…
The title compound has been isolated and is characterized by NMR and X-ray diffraction.
Abstract Recent developments in the formulation of detergents have been driven by a strong consumer demand for natural and biodegradable products. Detergent manufacturers responded to this demand with corresponding products and advertising slogans such as “fully biodegradable”, “natural” or even “double natural” to ou…
Abstract Farblose, plättchenförmige Kristalle von RbBS 3 (P2 1 /c, a=7,082(2) Å, b=11,863(4) Å, c=5,794(2) Å, β=106,54(2)°) entstehen aus einem stöchiometrischen Ansatz von Rubidiumsulfid, Bor und Schwefel bei 600°C und anschließendem Tempern. Die zu RbBS 3 isotype Phase TlBS 3 (P2 1 /c, a=6,874(3) Å, b=11,739(3) Å, c…
Metallosilicalite xerogels of the type MOx–SiO2 where M isTiIV, VV, MoVI, WVI and SeIV have been prepared by the sol–gel method and used as heterogeneous catalysts for the epoxidation, allylic oxidation and carbon–carbon bond cleavage of alkenes, the hydroxylation of phenols, and the oxidation of alcohols to ketones b…
Space vacuum is considered as an insulation component to achieve constructional and operational advantages over totally enclosed designs for the increasing demand for higher levels of electrical power and voltages in spaceborne electrical systems. The dielectric properties of space vacuum insulations are determined ma…
Chemically pure and stoichiometric lanthanide chromites, LnCrO3, where Ln = La, Pr, Nd, Sm, Gd, Dy, Ho, Yb, Lu and YCrO3 have been prepared by the calcination of the corresponding lanthanide bis(citrato)chromium {Ln[Cr(C6H5O7)2·nH2O} complexes at relatively low temperatures. Formation of the chromites was confirmed by…
A transverse magnetic field formulation of the finite-element method for solving lightwave propagation in optical guides has been implemented. The method requires that the interface boundary conditions for E/sub Z/ and H/sub Z/ be imposed, and this is performed by solving the vector wave equation in the null space of…