Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of a novel copper(I) cyanide complex with hexamethylenetetramine, (CuCN)3(C6H12N4)2Fred B. StockerCite this: Inorg. Chem. 1991, 30, 7, 1472–1475Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 199…
Hydrotalcite-like compounds containing Ni(II) and Al(III) cations and with different Ni/Al ratios in the brucite layers have been prepared and studied using FT-IR and V-UV/DR spectroscopies. It has been found that the local environment of the Ni(II) cations is the same in all cases, occupying octahedral holes, but the…
The mechanochemical reactions between CsBr and kaolinite that occur during shaking, grinding at ambient atmosphere (air grinding), and grinding in the presence of a few drops of water (wet grinding), were investigated by photoacoustic and diffuse reflectance infrared spectroscopy and by thermal weight loss. An interca…
The preparation, and conductivity, calorimetric, and electrochemical studies of mixed polymer electrolytes, where MEEP = poly[bis‐(methoxyethoxyethoxide)phosphazene], PPO = poly(propylene oxide) and , are described. The addition of PPO in various proportions to electrolytes significantly improved the latter's dimensio…
Abstract For the purpose of the evaluation of the R—T spin coupling parameter, A RT , an analysis of the Curie temperature is made for the rare earth—transition metal systems R m T n (R rare earth T = Fe, Co; m / n = 1/2, 1/3, 6/23, and 2/17) and some systems of recent and growing interest, such as R 2 T 14 B, RT 11 T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPersistence length and molecular mass distribution of a thermotropic main-chain liquid-crystal polymerHerbert Kroemer, Rainer Kuhn, Harald Pielartzik, Wilfried Siebke, Volker Eckhardt, and Manfred SchmidtCite this: Macromolecules 1991, 24, 8, 1950–1954Publication Date (Print…
In HV devices such as power cables, electrical stress enhancement can occur at the interface of semiconducting shields (semicon) and polymeric insulation. In this study, points of electrical stress enhancement are simulated by embedding semicon protrusions into the polymer. XLPE with two different concentrations of cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplete carboxylate removal from [Mn12O12(OAc)16(H2O)4].cntdot.2HOAc.cntdot.4H2O) with chlorotrimethylsilane: synthesis and characterization of polymeric (2,2'-bipyridine)trichloromanganese and an improved synthesis of bis(tetraethylammonium) pentachloromanganate(2-)Spiros…
Alignment recovery from damage has been confirmed to occur under an AC electric field, e.g. , 30 V pp ·µm -1 , in antiferroelectric chiral smectic liquid crystal cells of MHPOBC and a related fluorinated compound. The recovery partly results from internal shearing produced by reversible layer switching between bookshe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThin oxide layers on clean iron surfaces: formation under vacuum and characterization by photoelectron spectroscopy and electrochemical reactions of probe molecules at the oxide/electrolyte interfaceB. L. Maschhoff and N. R. ArmstrongCite this: Langmuir 1991, 7, 4, 693–703Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of small-angle x-ray scattering data for model polyurethane ionomers: evaluation of hard-sphere modelsSusan A. Visser and Stuart L. CooperCite this: Macromolecules 1991, 24, 9, 2584–2593Publication Date (Print):April 29, 1991Publication History Published online1 May…
Exception faite de C 24 H 50 et C 26 H 54 , des donnees de diffraction RX sont en accord avec les predictions faites sur les homologues de ces series par Nyburg et Potworowski: C 18 H 38 , C 20 H 42 et C 22 H 46 ― maille triclinique (Z=1) ― C 28 H 58 maille monoclinique (Z=2) ― C 19 H 40 , C 21 H 44 , C 23 H 48 , C 25…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle neutron scattering and light scattering studies on the miscibility of protonated polyisoprene/deuterated polybutadiene blendsHirokazu Hasegawa, Shinichi Sakurai, Mikihito Takenaka, Takeji Hashimoto, and Charles C. HanCite this: Macromolecules 1991, 24, 8, 1813–18…
Black crystals of the title complex are obtained by slow diffusion of THF solutions of [Re 2 Cl 4 , (dppm) 2 ] (ReRe) and tetracyanoquinodimethane (TCNQ). Although their conductivity is only ca. 10 −5 S cm −1 , the magnetic and structural features of this charge transfer complex are remarkable. The bridging of two me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of bis(nitro)(.alpha.,.alpha.,.alpha.,.alpha.-tetrakis(o-pivalamidophenyl)porphinato)ferrate(III) with pyridine and imidazole. EPR and Moessbauer spectra and molecular structures of the mixed-ligand speciesHabib Nasri, Yaning Wang, Huynh Boi Hanh, F. Ann Walker, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new hydrogen-bonded dinuclear complex involving copper(II) ions in a pseudotetrahedral N3O environment: molecular and crystal structure and magnetic and spectroscopic propertiesEnrique Colacio, Jean Pierre Costes, Raikko Kivekas, Jean Pierre Laurent, Jose Ruiz, and Markku…
The effect of size restriction on the low temperature emission of silver bromide is examined. The critical size for the onset of detectable free exciton emission is determined. The effect of deliberately introduced iodide traps on free exciton luminescence was examined. Several reasons for the enhancement of the free…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization and morphology of semicrystalline polyimidesDaniel P. Heberer, Stephen Z. D. Cheng, Jeffrey S. Barley, Shawn H. S. Lien, Robert G. Bryant, and Frank W. HarrisCite this: Macromolecules 1991, 24, 8, 1890–1898Publication Date (Print):April 1, 1991Publication His…
A new type of memory effect is observed in polymer-dispersed-liquid-crystal (PDLC) film with UV-curable polymer. The transmittance of the memory state is preserved for a long time after an applied voltage is removed. In this state, the resistivity of the film decreases and the dielectric constant increases comparing t…
Thin-walled expanded polytetrafluoroethylene (ePTFE), woven Dacron and gelatin-impregnated Dacron (Gelseal) vascular grafts were compared, the grafts being coated with three different matrices: collagen IV, fibronectin and preclot matrix. In addition, untreated ePTFE and Gelseal were examined. The graft segments, coat…