Materials Literature
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Electron induced gas desorption yields from stainless steel, copper, and aluminum surfaces have been measured for electrons of 300 eV energy. The main gases desorbed were H2, CH4, H2O, CO, and CO2. The effect of increasing the temperature on the gas desorption yields was measured and the only yields affected were thos…
Abstract Binary copolyesters were prepared by polycondensation of the trimethylsilylester of acetylated β‐(4‐hydroxyphenyl)propionic acid (HPPA) with acetylated 4‐hydroxybenzoic acid (HBA), vanillic acid (VA), 6‐hydroxy‐2‐naphthoic acid (HNA), 4‐hydroxycinnamic acid (HCA) or 4′‐hydroxybiphenyl‐4‐carboxylic acid (HBCA)…
Microstructures of block copolymers in the strong segregation limit are characterized by well-defined interfaces separating the different block materials into domains on a nanometer scale. In this paper, we address the effects of architectural and conformational asymmetry of the blocks on the interfacial curvature cha…
The new algorithm of the thermal conductivity and thermal diffusivity determination from the transient hot-wire method has been applied to measurements performed in several solid materials. The algorithm makes use of the exact formula for the temperature variations, instead of its simple, asymptotic form that has been…
Monodispersed nanospheres of carbon are obtained by the pyrolysis of methane or benzene at high temperatures in the presence of hydrogen without the use of any catalyst. Carbonization of these hydrocarbons over transition metal powders (for example Ni) or supported metal catalysts, however, yields carbon nanotubes.
Dielectric relaxation phenomena are studied in detail at the 107 K structural phase transition in ${\mathrm{SrTiO}}_{3}.$ These loss phenomena are explained in terms of the dynamics of domain walls that occur at the cubic-to-tetragonal phase transition and exist as precursor phenomena (locally ordered regions) in the…
Abstract— Octaphenyltetraanthraporphyrazinato palladium undergoes a self‐sensitized photoreaction in the presence of oxygen to form a substituted palladium phthalocyanine with four endoperoxide bridges. This compound exhibits photophysical behavior similiar to palladium tetra‐tert‐ butyl‐phthalocyanine. The phthalocya…
We report an experimental procedure to optimize the current profile of a focused ion beam probe, with a special emphasis on high resolution applications. The optimized operating conditions are given for three specific cases: specimen thinning for electron microscopy, nanoetching, and nanolithography. We present high q…
Inexpensive and efficient cellulose-based adsorbents were prepared by the reaction of cross-linked polyethylenimine (CPEI) with an agricultural waste (i.e., wood sawdust). Factors affecting the extent of amination, such a CPEI concentration, pH, time, and temperature of reaction as well as sawdust particle size range,…
Abstract Transport models of diffusion‐induced bubble growth and collapse in viscous liquids are developed and evaluated. A rigorous model for these important phenomena is formulated taking into account convective and diffusive mass transport, surface tension, and viscous and inertial effects. Predictions for bubble g…
Propagation of elastic waves near the cohesive limit of a solid is of interest in understanding the speed at which strain energy is transported in front of a mode-I crack tip. It can be argued that the crack propagation velocity is limited by how fast the strain energy can be transported ahead of the crack tip to sust…
X-ray crystal structures of three substituted 4,4‘-biphenyldiamines, namely, 2,2‘,6,6‘-tetramethylbenzidine (TMBZ), 2,2‘-dimethylbenzidine (DMBZ) and 2,2‘-bis(trifluoromethyl)benzidine (BFBZ), were determined. The torsional angles between the two phenyl rings for TMBZ, DMBZ, and BFBZ are φ = 83°, 75°, and 59°, respect…
To clarify further the mechanism of regulation by phosphorylation of isocitrate dehydrogenase, cocrystallization of isocitrate dehydrogenase and isocitrate dehydrogenase kinase/phosphatase in the presence of an ATP analog was attempted. Although cocrystallization was unsuccessful, a new crystal form of isocitrate dehy…
Two kinds of cadmium sulfide (CdS) particulate films have been generated in situ by exposing stearic acid (SA) Langmuir monolayer at the air−aqueous CdCl 2 interface to hydrogen sulfide (H 2 S) gas: particulate films composed of oriented rodlike nanocrystals (A-type particulate films), and those of dotlike nanocrystal…
Aluminosilicates were prepared by the sol−gel method using tetraethoxysilane as silica source and aluminum ethoxide, aluminum iso-propoxide, or aluminum sec -butoxide as alumina sources. An important effect of the alkylaluminum substitutes is observed in the BET specific area, ethoxide > isopropoxide > sec -butoxide.…
Curing bis(maleimide) (BMI) with diallylbisphenol A (DABPA) results in the formation of a high-performance thermoset resin. A variety of reactions in which maleimide units are converted to succinimide moieties have been proposed. In order to make spectral assignments for the fluorescence behavior observed during the c…
The fracture toughness G c of an interface between the immiscible homopolymers polystyrene (PS) and poly(2-vinylpyridine) (PVP) reinforced with random copolymers, dPS f − r -PVP 1- f was measured as a function of the average monomer fraction f and the areal chain density Σ of the copolymer. Long symmetric random copol…
The compound [Cu(cyclam)(TCNQ) 2 ](TCNQ) (cyclam = 1,4,8,11-tetraazacyclotetradecane, TCNQ = 7,7,8,8-tetracyanoquinodimethane) has been obtained in two different crystallographic forms, isomers 1 and 2 . Crystal data for isomer 1: triclinic, P 1̄, a = 7.855(6) Å, b = 10.267(2) Å, c = 14.424(3) Å, α = 95.42(2)°, β = 10…
The bonding of atomic oxygen on Pt(111) and Rh(111) was examined using density functional theory in order to understand their different chemical properties. The oxygen−surface interactions were modeled by bonding atomic oxygen to 10-atom clusters of Pt and Rh designed to model the (111) surface. Density functional the…
A series of alkyl and dialkylammonium polyacrylates were synthesized by neutralizing a 5000 molecular weight poly(acrylic acid) with alkyl- and dialkylamines. Their thermal stability was investigated using thermogravimetry. Their thermotropic liquid crystal behavior was analyzed using differential scanning calorimetry…