Materials Literature
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Very regularly coiled spring-like fibers of Si3N4 have been obtained from a gas mixture of Si2Cl6, NH3, and H2 at 1200 °C on a graphite substrate on which an iron impurity was painted. The spring-like fibers were amorphous Si3N4 with a circular cross section having a 0.5–1 μm thickness, 3–5 μm coil pitch, 10–15 μm coi…
A high-resolution neutron scattering study of ${\mathrm{Ni}}_{62.5}$${\mathrm{Al}}_{37.5}$ shows that the martensitic transformation is associated with a homogeneous distortion and a nearly seven-fold modulation of the cubic lattice which is predicted by an observed phonon anomaly above ${T}_{M}$. In the low-temperatu…
The resonance-enchanced multiphoton ionization (REMPI) technique was employed for detection of gas phase atomic hydrogen in the filament-asisted diamond growth environment. The H atom REMPI signal varied significantly with the reactant CH4/H2 fraction as well as with the filament temperature. We interpret these observ…
The magnetic field (H) dependences of the ultrasonic attenuation Δα(H) and the relative velocity ΔV(H) responses of 0.6 GHz Rayleigh-mode surface acoustic wave pulses in vacuum-evaporated, uniaxially anisotropic nickel thin films were measured and correlated with changes in the sample’s dc magnetoresistance Δρ(H). Rec…
In this Letter we study the evolution of a two-dimensional soap froth. We present experimental evidence for the existence of a limiting scale-invariant distribution of the number of sides in a bulk froth at long times. We also discuss the apparent failure of the hypothesis that all internal angles in a froth are 120\i…
Real time in-situ optical measurements play a vital role in the monitoring and control of thin film deposition and etching. Techniques include single and multiwavelength monitoring of the reflectance and/or transmittance of the coating substrate, in-situ ellipsometry, and spectroscopic diagnostics of the vapour specie…
We have made multiple replacements (alanine, arginine, cysteine, histidine, isoleucine, serine, tyrosine) of valine-75 in dihydrofolate reductase from Escherichia coli to examine the relative importance to protein folding of the position that is substituted and the specific character of the amino acid replacement. Val…
As simple model density functional Hamiltonian is shown to lead to a consistent static and dynamical theory of the structural glass transition where glassy metastable free-energy states play a key role. The crucial concept introduced is a probabilistic order parameter description that results when multiple solutions o…
Monodisperse distributions of 1.01 mu m and 2.88 mu m polystyrene microspheres in monolayers on the surface of water were used in a study of isothermal-expansion melting in two dimensions. The equation of state, defect structures, and the translational and orientational correlation functions were obtained from digitis…
There has emerged recently a new theoretical picture of the way in which patterns are formed in dendritic crystal growth and in the closely analogous phenomenon of viscous fingering in fluids. Some interesting questions that arise in connection with this theory include: How broad is its range of validity? How do we un…
Basic lead styphnate RD 1349 forms the primary explosive component of several high temperature fuzehead formulations and percussion primers. A study of its thermal decomposition under controlled conditions near its ignition temperature (521–525 K) shows that it decomposes very rapidly, following a second order autocat…
Reaction of 1,3,5-tris(dimethylamino)benzene (TDMAB ) with 1,2,3,4,5,6-hexacyanobenzene (HCNB) in acetonitrile solution gives - depending on the crystallization method - two different products: dark needles of a 1:1 (1) and black compact crystals with a metallic lustre of a 2:1 (2) charge transfer complex. 2 crystalli…
Abstract Novel poly(amide‐sulfonamide)s have been prepared by reacting terephthaloyl, isophthaloyl, and sebacoyl chloride with variously substituted dianilines containing preformed sulfonamide linkages. Inherent viscosities of the prepared polymers ranged from 0.19 to 0.58 dL/g. Despite low apparent viscosities, the p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of syndiotactic poly(vinylcyclohexane)Kazuo Soga, Hisayuki Nakatani, and Takesi ShionoCite this: Macromolecules 1989, 22, 3, 1499–1500Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 Marc…
Irradiation, with ultraviolet light, of 2-phenylbenzotriazole in aerated solvents resulted in oxidation of the benzo ring to yield the diacid 2-phenyl-1,2,3-triazole-4,5-dicarboxylic acid. A possible intermediate, 2-phenylbenzotriazole-4,7-dione, also yielded the diacid on photooxidation . The methyl ether of the comm…
Grain-oriented silicon steels of various thickness were built into 3-phase stacked cores, and the relationship between the building factor (B.F.) and the material loss was discussed. The loss component proportional to square of frequency ( W e ), and the ratio of W e to total loss too, decrease as the thickness of the…
The A2BX4 family of K2SO4-related structures have long been of interest to crystal chemists, largely due to the numerous different polymorphs and complicated sequences of phase transitions they sometimes exhibit as a function of temperature. For most such A2BX4 compounds, there are essentially only two distinct struct…
Complex modulus data is presented for a total of 44 materials. The material types include polymers, enamels, and structural adhesives. The complex modulus data was obtained using the ASTM E-756 standard test. The complex modulus data set for each material given in this report contains the following information: A full…
People are major contributors of particle contamination in cleanrooms and therefore must wear occlusive clothing to reduce their dispersion. Three tests are described which assess the effectiveness of fabrics in filtering body emissions. Also described is a dispersal chamber in which the dispersal rate of a person can…
Abstract The unit cell dimensions of minerals in the smectite group, regular and random mixed-layer groups, and halloysite shown in the Mineral Powder Diffraction File (1986) have been refined by least-squares analysis in the hexagonal system with a primitive lattice with indices restricted to hk or 00 l reflections.…