Materials Literature
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A review of the basic experimental results connected with the formation of long-living metastable states in the incommensurate phases of ferroelectric crystals and related phenomena is given. The interpretation and appropriate physical mechanisms underlying the global hysteresis phenomena associated with these states…
The effect of surface treatment in surface stabilized ferroelectric liquid crystal(SSFLC) cells on the smectic layer structure was studied by X-ray diffraction. The surfaces of glass plates were coated with polyimide to produce low- and high pretilt cells. Two different types of diffraction patterns were obtained at r…
The search for new organic conductors has led to a broadly variable class consisting of the radical anion salts of naphthalenetetracarboxylic dianhydride and diimide. The X-ray structure analysis of the complex 1 (single crystal conductivity σ20°C = 10 S cm−1) revealed a stacking of anionic units characteristic of one…
Possible pH variations during crystallization of biological macromolecules by the vapor diffusion method have not been taken into account in most experiments so far reported. The present study demonstrates that when ammonium sulfate is used as the precipitant, pH changes occur due to ammonia transfer following ammoniu…
Abstract The infrared (IR) spectra of almandine-grossular and almandine-pyrope garnet solid solutions have been measured using the powder method. Frequency shifts of a band related to internal vibrations associated with the 8-co-ordinate dodecahedral site are nonlinear in almandine-grossular garnets and mimic the form…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1:1 Adducts of lead(II) thiocyanate with 1,10-phenanthroline and 2,2',6',2"-terpyridineLutz M. Engelhardt, Brenda M. Furphy, Jack M. Harrowfield, Jennifer M. Patrick, and Allan H. WhiteCite this: Inorg. Chem. 1989, 28, 7, 1410–1413Publication Date (Print):April 1, 1989Public…
Abstract A kaolinite-pyridine intercalation compound was prepared using hydrated kaolinite as an intermediate. Hydrated kaolinite having a basal spacing of 10 Å was treated with pyridine to form a well-ordered intercalation compound having a basal spacing of 12.0 Å. Infrared spectroscopy indicated the presence of hydr…
Kupferglimmer, CU3Ni2−x SbO6−x where x = 0.1–0.2, occurs in copper anodes of the CCR Division of Nor and a Minerals Inc. that contain >0.30% Ni and > 200 ppm Sb. The associated anode slimes are also kupferglimmer-bearing. The kupferglimmer in the CCR circuit shows a significant substitution of Sn for Sb, and most of t…
The adsorption of uranium and thorium from aqueous solutions by montomorillonite and vermiculite has been studied. The uranium and thorium concentration of the solutions varied between 100 and 2000 ppm. The behaviour of vermiculite as adsorbent of uranyl ions was found to be identical to montmorillonite, whereas the q…
Abstract A comparison of crystallite thickness distributions, as obtained from thin section electron microscopy, small‐angle x‐ray scattering, and low‐frequency Raman acoustical model (LAM), is discussed in detail. It is shown with the aid of a large number of examples that a reliable numerical estimate of crystal thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrazeolite site-selective far-IR cation probeGeoffrey A. Ozin, Mark D. Baker, John Godber, and Caroline J. GilCite this: J. Phys. Chem. 1989, 93, 8, 2899–2908Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989h…
Abstract Amino resins can be applied as well materials for the microencapsulation of drugs, agrochemicals, adhesives, and dyestuff systems for pressure‐sensitive copying paper. The microencapsulation is carried out with unmodified or modified, etherified or non‐etherified amino resins, in most cases with addition of w…
Time evolution of domain patterns in a quenched ferroelectric triglycine sulphate (TGS) crystal is investigated in real time and in real space. The effect of applying an electric field after quenching is studied. The characteristic length, defined as a mean domain width, is found to obey the power law with respect to…
Anodic alumina films prepared in phosphoric, oxalic, sulphuric and chromic acids have been examined using magic-angle spinning nuclear magnetic resonance. Whilst only hexacoordinated aluminium is observed in films formed in chromic acid, tetra-, penta- and hexacoordination is observed in films formed in oxalic and sul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of ring strain and steric hindrance in a new method for the synthesis of macrocyclic and high-polymeric phosphazenesIan Manners, Geoffrey H. Riding, Jeffrey A. Dodge, and Harry R. AllcockCite this: J. Am. Chem. Soc. 1989, 111, 8, 3067–3069Publication Date (Print):April…
Abstract The tensile drawing behavior of poly( L ‐lactide) has been studied in order to obtain high strength fibers. Elongational viscosity measurements indicated that the hot drawing can take place in two temperature regions with different activation energies. Up to 180°C, the deformation proceeds in the semicrystall…
Abstract The application of titanate coupling agents for the surface modification of mica filler and its reinforcement in polypropylene (PP) has been directed towards improvement in mechanical properties. Four titanate coupling agents, namely neoalkoxy tri(dioctylpyrophosphato) titanate (C 1 ), neoalkoxy trineodecanoy…
Acid oxalate reagent was used at various concentrations, pH values, shaking times, and soil to solution ratios to find the optimum conditions for the extraction of Al, Fe, and Si from short‐range‐order materials in soils and stream‐bed deposits. The optimum conditions vary with the nature of the soil sample and its co…
The stress corrosion cracking (SCC) of AISI(1) 304 and AISI 316 austenitic stainless steels in 0.82 kmol/m3 HCl and H2SO4 solutions has been investigated as functions of stress and solution temperature by using the constant load method. It is found that the stress vs time-to-failure curves for both alloys are divided…
Abstract The impact fracture energy ( G c ) for a polypropylene homopolymer and a copolymer with and without calcium carbonate fillers was measured over a range of temperatures between −40°C and 40°C using fracture mechanics principles. The fillers studied were Omyacarb (∼2.7 μm) and Winnofil (∼75 nm) and 10% by weigh…