Materials Literature
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Platinum on γ-Al2O3 represents one of the technically important supported catalysts. In order to model such a system, we have prepared a well-ordered 5-Å-thick and atomically flat oxide film with γ-alumina-like structure on NiAl(110). Its defect structure has been subject to a spot-profile analysis–low-energy electron…
Hydrostatic pressure-induced morphological and physiochemical changes in monomeric myosin were investigated. The turbidity of a myosin solution increased after release of pressure, indicating aggregation of the molecules. Some molecules were single headed after exposure to 100-200 MPa, in contrast with an intact molec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUtility of N-Methylimidazole in Isolating Crystalline Lanthanide Iodide and Hydroxide Complexes: Crystallographic Characterization of Octasolvated [Sm(N-MeIm)8]I3 and Polymetallic [SmI(.mu.-I)(N-MeIm)3]2, [(N-MeIm)5Sm(.mu.-OH)]2I4, and {[(N-MeIm)4Sm(.mu.-OH)]3(.mu.3-OH)2}I4W…
The primary structure of bovine liver UDP-glucose dehydrogenase (UDPGDH), a hexameric, NAD(+)-linked enzyme, has been determined at the protein level. The 52-kDa subunits are composed of 468 amino acid residues, with a free N-terminus and a Ser/Asn microhetergeneity at one position. The sequence shares 29.6% positiona…
The deflection of a substrate caused by an anisotropic stress in a thin film that is deposited on it, is studied theoretically. An exact solution of the elastic equations for the three-dimensional cantilever problem is found. Equations for the deflection caused by anisotropic stresses due to, e.g., magnetostriction an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the State of Miscibility of Isotactic Poly(propylene)/Isotactic Poly(1-butene) Blends: Competitive Liquid-Liquid Demixing and Crystallization ProcessesP. M. Cham, T. H. Lee, and H. MarandCite this: Macromolecules 1994, 27, 15, 4263–4273Publication Date (Print):July 1, 199…
We show that there exists a novel long range interaction in ferroelectric Sm-C* materials due to thermally excited polarization waves. We propose that this interaction is the long range repulsion whose existence had been postulated earlier to explain the long period ferrielectric phases observed near the ferroelectric…
The nature of the interaction of CO with NiO(100) thin films (∼20–50 Å) grown on a Mo(100) substrate has been investigated with infrared reflection absorption spectroscopy. Isosteric heats of adsorption were measured for CO in a pressure range of 1×10−8 to 1 Torr and over a temperature range of 93–280 K. The average h…
Elongated β′‐SiAlON grains grown from several finegrained Y m/3 Si 12(m+n) Al m+n O n N 16–r compositions with α‐Si 3 N 4 , AlN, Al 2 O 3 , and Y 2 O 3 starting materials have been examined. These grains have large aspect ratios and are oriented along the [0001] axis. TEM structural and chemical analysis suggests that…
Conducting‐polymer‐based sensory materials systems are designed to exhibit ionochromic, electrochemical, and/or resistive responses to specific chemical signals. The integration of molecular recognition elements into them is described. Poly(bithiophene) undergoes a twisting of the polymer backbone upon ion complexatio…
Refractive indices of organic photochromic dye-amorphous polymer composites and their changes upon photo- irradiation were measured. The packing coefficients of the dyes in amorphous polymers were determined, and it becomes possible to estimate the refractive indices of the polymer composites containing various amount…
Site-directed mutagenesis is used in conjunction with 1H nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy in order to find an insulin species amenable for structure determination in aqueous solution by NMR spectroscopy. A successful candidate in this respect, i.e., B16 Tyr-->His mutant insulin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMulticomponent Polyanions. 47. The Aqueous Vanadophosphate SystemAnna Selling, Ingegaerd Andersson, Lage Pettersson, Charles M. Schramm, Shannan L. Downey, and John H. GrateCite this: Inorg. Chem. 1994, 33, 14, 3141–3150Publication Date (Print):July 1, 1994Publication Histor…
Abstract The negative electrical field around clay particles whose edge thickness is small relative to the Debye length of the diffuse double layer associated with the planar surfaces may spill over into the edge region. Such a spillover may affect B adsorption by the clay. This study was conducted to determine the ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and Electrochromic Properties of Poly(dialkylsilyleneferrocenylene) FilmsMy T. Nguyen, Arthur F. Diaz, Vyacheslav V. Dement'ev, and Keith H. PannellCite this: Chem. Mater. 1994, 6, 7, 952–954Publication Date (Print):July 1, 1994Publication History Published o…
peer reviewed
For many electronic applications, the surface of a dielectric polymer must be modified to obtain the desired surface properties, such as wetting, adhesion, and moisture barrier, without altering the bulk properties. This paper reviews wet- process modifications of dielectric polymer surfaces and also presents unpublis…
On the basis of the interaction of dipolar molecules with a liquid surface we calculate the thermodynamics of the molecular orientation and related mechanical and electric effects for a monolayer of molecules on an air-liquid interface. It is shown that compressing the molecular area should lead to a weak first order…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopy and Kinetics of Photochromic Materials for 3D Optical Memory DevicesA. S. Dvornikov, J. Malkin, and P. M. RentzepisCite this: J. Phys. Chem. 1994, 98, 27, 6746–6752Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published iniss…
A comparative study of the $^{29}\mathrm{Si}$ spin-lattice relaxation behavior (induced by trace amounts of paramagnetic dopants in the glass) in phase-separated ${\mathrm{Li}}_{2}$${\mathrm{Si}}_{4}$${\mathrm{O}}_{9}$ and monophasic ${\mathrm{Li}}_{2}$${\mathrm{Si}}_{2}$${\mathrm{O}}_{5}$ and ${\mathrm{Na}}_{2}$${\ma…