Materials Literature
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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…
Abstract Sediments collected at various field locations may have chemical and physical constituents that influence test results and may contain organisms that cannot be readily removed. Thus, reference sediments are needed that can be formulated to match diverse freshwater and estuarine sediments encountered in compre…
A new araphid diatom genus, Synedropsis Hasle, Medlin et Syvertsen, is described from sea ice. The generitype, Synedropsis hyperborea (Grunow) Hasle, Medlin et Syvertsen from the Arctic, was first described as a species of Synedra, as was the antarctic Synedropsis fragilis (Manguin) Hasle, Syvertsen et Medlin. A secon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopolymerization of Ethylene Carbonate and .epsilon.-Caprolactone Using Samarium ComplexesWilliam J. Evans and Hideo KatsumataCite this: Macromolecules 1994, 27, 14, 4011–4013Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue…
Microscopy studies of coexistence droplets of (tilted) surfactant molecules absorbed at air-water interfaces have demonstrated that such droplets contain a variety of textures. In this paper we describe the observed droplet textures using the Landau free energy for tilted hexatic surfactant films, supplemented by a bo…
A major challenge facing the synthetic inorganic chemist is the synthesis of solid materials with specifically designed properties. However, small soluble molecular building blocks with well-defined reaction chemistries which would allow low-temperature assembly into crystalline solid state inorganic materials are not…
Hyper-Rayleigh scattering has been developed as a generally applicable technique for the determination of the first hyperpolarizability β of a wide class of molecules [Clays and Persoons, Rev. Sci. Instrum. 63, 3285 (1992)]. In this article, we show that it is possible to replace the low repetition rate, nanosecond pu…
The study of the effective thermomechanical response of active fibrous composites with shape memory alloy (SMA) fibers is the subject of this work. A 3-D constitutive response for the SMA fibers is formulated first. To model thermomechanical loading path dependence, an incremental approach is used assuming that within…
Morphology, composition, and growth defects of α′‐SiAION have been studied in a fine‐grained material with an overall composition Y 0.33 Si 10 Al 2 O 1 N 15 prepared from α‐Si 3 N 4 , AlN, Al 2 O 3 , and Y 2 O 3 powders. TEM analysis has shown that fully grown α′‐SiAloN grains always contain an α‐Si 3 N 4 core, implic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Aggregation and Photoisomerization of Langmuir-Blodgett Films of Azobenzene-Containing Long-Chain Fatty Acids and Their Salts Studied by Ultraviolet-Visible and Infrared SpectroscopiesTakashi Sato, Yukihiro Ozaki, and Keiji IriyamaCite this: Langmuir 1994, 10, 7, 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimulation of Lamellar Phase Transitions in Block CopolymersR. G. LarsonCite this: Macromolecules 1994, 27, 15, 4198–4203Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi/10.1021/ma00093a0…
The mechanism of TiO2 thin film deposition on single crystal TiO2 by chemical vapor deposition (CVD) using tetrakis(isopropoxo)titanium(IV) (TTIP) has been investigated. The structure of the rutile(100) surface has been shown to form a 1×3 reconstruction using reflection high-energy electron diffraction. Temperature p…
Quasi-elastic light scattering (QELS) was used to investigate quantitatively the mechanisms of nucleation, postnucleation growth, and dissolution in ensembles of both crystalline and amorphous aggregates of satellite tobacco mosaic virus (STMV), ferritin, apoferritin and pumpkin seed globulin. At low supersaturation c…
We present a spectroscopic study of the green fluorescence resulting from pump excited-state absorption in Er-doped silica fibers excited in the 800-nm range. The absorption and emission bands are selectively attributed to the (4)S(3/2) and (2)H(11/2) levels. The fluorescence response at two excitation wavelengths, th…
The microstructures of anisotropic Nd-Fe-Co-B-(Ga, or Zr) magnet powders produced by the hydrogenation-decomposition-desorption-recombination (HDDR) process and the resulting crystallographic c-axis orientation of Nd2(Fe,Co)14B crystals in the powder particles have been studied. It was found that the powder particles…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
A brittle-to-ductile transition via dislocation nucleation is directly observed by molecular-dynamics simulation of the propagation of a sharp crack in a single crystal under mode-I loading. The crack-tip system is modelled using an embedded-atom method (EAM)-type interatomic potential function for alpha -Fe (BCC) and…
Applying the bosonization procedure to weakly coupled Hubbard chains, we discuss the fixed points of the renormalization-group procedure where all spin excitations are gapful and a singlet pairing becomes the dominant instability.
We have investigated intramolecular photoinduced charge separation and recombination in a series of cyclophanebridged porphyrinquinone systems by means of time−resolved fluorescence decay measurements. Rates of charge separation have been determined as a function of the free energy change of the reaction, of the polar…