Macromolecular Engineering of Polylactones and Polylactides. 18. Synthesis of Star-Branched Aliphatic Polyesters Bearing Various Functional End Groups
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Wet-process surface modification of dielectric polymers: Adhesion enhancement and metallization
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…
Phase transition of molecular orientation at the liquid-air interface
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…
Spectroscopy and Kinetics of Photochromic Materials for 3D Optical Memory Devices
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…
Phase separation, clustering, and fractal characteristics in glass: A magic-angle-spinning NMR spin-lattice relaxation study
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…
Development of formulated reference sediments for freshwater and estuarine sediment testing
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…
Synedropsis gen. nov., a genus of araphid diatoms associated with sea ice
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…
Copolymerization of Ethylene Carbonate and .epsilon.-Caprolactone Using Samarium Complexes
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…
Textures of surfactant monolayers
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…
Clusters and Solid Phases of the Oxovanadium–Phosphate and – Organophosphonate Systems
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 in solution with tunable femtosecond continuous-wave laser source
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…
Micromechanics of Active Composites With SMA Fibers
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…
Nucleation and Growth of α′‐SiAlON on α‐Si 3 N 4
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…
Molecular Aggregation and Photoisomerization of Langmuir-Blodgett Films of Azobenzene-Containing Long-Chain Fatty Acids and Their Salts Studied by Ultraviolet-Visible and Infrared Spectroscopies
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…
Simulation of Lamellar Phase Transitions in Block Copolymers
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…
Kinetic and mechanistic study of the chemical vapor deposition of titanium dioxide thin films using tetrakis-(isopropoxo)-titanium(IV)
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…
Light-scattering investigations of nucleation processes and kinetics of crystallization in macromolecular systems
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…
Thermalization effects between upper levels of green fluorescence in Er-doped silica fibers
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…
Microstructures and crystallographic orientation of crystalline grains in anisotropic Nd-Fe-Co-B-(Ga or Zr) magnet powders produced by the hydrogenation-decomposition-desorption-recombination process
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…
Atomic-oxygen undercutting of Long Duration Exposure Facility atomized-Kapton multilayer insulation
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.