Materials Literature
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Abstract The photochromic responses of mixed WO 3 – MoO 3 thin films subjecting to UV irradiation were investigated in reducing environments, and they were compared with those of WO 3 and MoO 3 thin films. It was found that the photochromism of mixed 92% WO 8% MoO 3 thin film in ethanol vapor was significantly enhance…
Al films were vapor deposited in high vacuum onto SiO2/Si substrates at various substrate temperatures (T) and deposition rates (R) which ranged, respectively, from 24 to 250 °C and from 2 to 90 Å/s. The films were examined by scanning electron microscopy (SEM) and showed systematic variations in topography. Hillock f…
Abstract The bonding of several black-filled natural rubber vulcanizates to brass-plated steel cord was investigated using the TCAT pullout geometry. Compositions using either cobalt naphthenate or an HR bonding system (hexamethoxymethyl melamine plus RFR) had higher pullout forces than a control without these agents.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of the .pi.-bonding ability of imidazole: structure determination and characterization of catena-(H2O)2(1-CH3im)2Mg(.mu.-CN)(CN)4(1-CH3im)Fe(III).cntdot.H2O (1-CH3im = 1-methylimidazole)Craig R. Johnson, Colleen M. Jones, Sanford A. Asher, and Jaime E. AbolaCite t…
Interfacial reactions of SiC with selected high temperature metals have been studied at temperatures between 1000 and 1200 °C for various times. The metals include Nb, a strong carbide former, Ni, Co, and stainless steel. Reactions of the metals with SiC in this temperature range were extensive; various metal silicide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond time-resolved fluorescence spectroscopy of the photochromic reaction of spiropyran in Langmuir-Blodgett filmsTakahide Minami, Naoto Tamai, Tomoko Yamazaki, and Iwao YamazakiCite this: J. Phys. Chem. 1991, 95, 10, 3988–3993Publication Date (Print):May 1, 1991Public…
Abstract 19 F chemical shifts are reported for a series of alkyl‐substituted fluoronaphthalenes and related compounds that exhibit steric crowding around the fluorine atom due to the proximity of methyl groups. Comparisons of these chemical shifts with others measured in similar compounds but without the corresponding…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface force measurements of polystyrene-block-poly(ethylene oxide) adsorbed from a nonselective solvent on micaDavid Guzonas, Daniele Boils, and Michael L. HairCite this: Macromolecules 1991, 24, 11, 3383–3387Publication Date (Print):May 1, 1991Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new configuration of 12-crown-4Edward T. Seidl and Henry F. Schaefer IIICite this: J. Phys. Chem. 1991, 95, 9, 3589–3590Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https://pubs.acs.org/doi/10.1021/j100162a02…
Abstract Thermal, dielectric, and mechanical relaxation measurements on miscible blends of polybenzimidazole (PBI) and a polyetherimide (PEI, Ultem 1000) prepared by solution casting from dimethylacetamide (DMAc) reveal a number of structurally related features. Annealing below the glass transition temperature induces…
Two-component liquid crystalline (LC) mixtures containing LC diacrylates and chiral molecules with no reactive groups were made. Upon photopolymerisation of the mixtures, cholesteric networks containing up to 28% w/w chiral molecules which were not chemically attached to the networks were created. Temperature dependen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclynes. 9. Regioselective coupling of ethynylcyclopropane units: hexaspiro[2.0.2.4.2.0.2.4.2.0.2.4]triaconta-7,9,17,19,27,29-hexayneArmin De Meijere, Frank Jaekel, Arndt Simon, Horst Borrmann, Jurgen Koehler, Dan Johnels, and Lawrence T. ScottCite this: J. Am. Chem. Soc. 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced porphyrin-to-quinone electron transfer across oligospirocyclic spacersSpencer Knapp, T. G. Murali Dhar, Jennifer Albaneze, Steve Gentemann, Joseph A. Potenza, Dewey Holten, and Harvey J. SchugarCite this: J. Am. Chem. Soc. 1991, 113, 10, 4010–4013Publication Dat…
Fully agglomerated superfine zirconia powders were prepared with the coprecipitation and spray‐drying method. The compaction of such powders shows no fragmentation of the agglomerates. The sintering behavior of the compacts was studied and two sintering stages were identified: densification within agglomerates at temp…
Reaction of (tBu) 2 Si(OH) 2 with TiCl 4 , TiBr 4 , TiI 4 , and ZrCl 4 affords eight-membered rings 2a-2d. The X-ray structural analysis of 2a, 2b and 2d reveals in 2a and 2b tetrahedral and in 2d octahedral coordination at the transition metal atoms. The octahedral geometry in 2d is due to two additional coordinated…
The present study is a comparison of the properties of rare‐earth aluminogermanate and rare‐earth aluminosilicate glasses. Several properties have been measured, including density, transformation temperature, softening point, thermal expansion, Vickers hardness, magnetic susceptibility, Verdet constant, and IR transmi…
The hdc genes encoding the inducible pyridoxal-P-dependent histidine decarboxylase (HisDCase) of Klebsiella planticola and Enterobacter aerogenes were isolated, sequenced, and expressed in Escherichia coli under control of the lac promoter, and the overproduced enzymes were purified to homogeneity from the recombinant…
Electric polarizabilities, dipole and quadrupole moments of the molecules LiH, LiF, LiCl, NaH, NaF, NaCl, BeO, BeS, MgO, MgS, BeH, BeF, BeCl, MgH, MgF, MgCl, LiO, LiS, NaO and NaS are computed in a uniform basis at the correlated level of theory. The results are rationalized in terms of the properties of ion pairs, an…
Mechanical alloying of a mixture of Ag and Fe powders, with initial grain size of about 100 µm, has been performed. Metallography in atomic scale, by the use of a high resolution electron microscopy, reveals the nanometer-sized crystalline structure in a Ag-50 at%Fe alloy. The 57 Fe Mössbauer spectroscopy confirms the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal-amorphous interphases in binary polymer blendsJames P. Runt, Catherine A. Barron, Xiu Fang Zhang, and Sanat K. KumarCite this: Macromolecules 1991, 24, 11, 3466–3468Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1…