Materials Literature
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The early stage of corrosion of copper by moist air containing 0.5% sulfur dioxide (75% relative humidity at 25°C) has been studied. Scanning electron microscopy, Auger electron spectroscopy, and transmission electron microscopy have been used to examine the surface topography, surface chemistry, and microstructure of…
The photoinduced phase transition behavior of liquid crystals (LCs) was investigated. The rate of the phase transition increased with increasing temperature and decreasing cell gap. The amount of isomerization of photoresponsive molecules to induce the phase transition was found to depend on the LC forming force and a…
The crystal structure of the low temperature modification of Na 3 PO 4 ( T < 601 K) has been determined and refined by means of Rietveld's full-profile technique using X-ray and neutron powder diffraction data. T-Na 3 PO 4 is tetragonal with space group P [unk]2 1 c . The cell dimensions are a = 1080.84(6) pm, and…
The electronic structure of some monomethyl derivatives of alloxazine has been investigated by the INDO/S-Cl-1 method in both the ground and in the two first-excited singlet states. A description of the intrinsic states of molecules by the extensive use of HOMO/LUMO coefficients is suggested. The proposed method both…
The room temperature mechanical properties of SiC fiber reinforced reaction-bonded silicon nitride matrix composite laminates (SiC/RBSN) have been measured. The laminates contained ∼30 vol% fraction of aligned 142-μm diameter SiC fiber in a porous RBSN matrix. Three types of laminates studied were unidirectional lamin…
Abstract A series of polyurethane elastomers were studied in which the soft segment composition was a molecular weight advanced poly(ethylene ether carbonate)diol (2025 mol wt) and the hard segment composition was based on MDI/1,4‐butanediol. These polyurethane elastomers had a constant soft segment composition and bl…
Polysilazane‐derived ceramic coatings in the form of thin films (0.1 to 4 μm) — fabricated by dipcoating soda‐lime rods with preceramic polymer solutions, followed by pyrolysis — increased the strength of the glass rods. Strengths up to 414 ± 57 MPa were obtained, 2.3 and 3.3 times higher than the strengths of uncoate…
La or Ce 3 d - and 4 d -core photoemission spectra are discussed for La and Ce compounds on the basis of the impurity Anderson model taking into account the atomic multiplets due to electron-electron interaction. A consistent explanation of 3 d and 4 d XPS of La and Ce compounds is presented. We also give an interpret…
ESR and optical absorption spectra have been recorded for a frozen dimethylformamide (DMF) solution of the complex FeIIIOEP(-OH)(-OOH)(OEP = octaethylporphyrinato) prepared by mixing FeIIOEP(pyridine)–O2 with ascorbic acid sodium salt.
22% Cr-3% Mo duplex stainless steels in which Ni and N contents were varied independently were prepared and base metal and TIG weld metal were subjected to pitting corrosion tests in 6% FeCl3. The critical pitting temperature at which pitting corrosion occurred was evaluated and the pitting site was observed. The pitt…
Abstract Experimental data for the dependence of the specific volume on temperature and pressure (PVT data) of a polydimethylsiloxane fluid with 100 cS viscosity are presented. The temperature range covered is 30–344°C and the pressure range is 0–200 MPa (0–29,000 psi). Coefficients for an empirical equation of state…
Abstract A series of high molecular weight, linear polyamide samples have been subjected to various solution spinning techniques, such as gel, wet, and dry spinning, in an attempt to produce high‐tenacity filaments. The spinning experiments involved polyamide 6, polyamide 12, and copolymers thereof, with a molecular w…
Abstract The cationic polymerization of cardanol using borontrifluoridediethyletherate as initiator has been investigated by gel permeation chromatographic techniques. The molecular weight and molecular weight distribution of the polymer at different temperatures and various initiator concentrations were studied, and…
CuI is known to undergo two phase transitions at T 1 = 367°C and T 2 = 407°C. The structural changes involve a rearrangement of the anions and disordered distributions of the cations. The low temperature γ -phase has zincblende structure, space group F [unk]3 m [ a = 6.0337(3) Å, Z = 4]. The intermediate β -phase belo…
It has been shown that increasing bacterial iron concentration enhances killing by hydrogen peroxide (H2O2) but not by polymorphonuclear granulocytes (PMN). It is possible that owing to the multiple bactericidal mechanisms of the PMN, differences in the killing rate of iron-loaded bacteria and control bacteria are obs…
Description STP 1030 provides the insulation community with an update on residential, commercial, and industrial application. Includes 50 papers on new materials assessments and properties of foams, properties and models, loose-fill behavior, systems performance testing, building applications and user interests, and i…
Abstract Treatment of cotton cellulose with 3 M sodium hydroxide solution at 260°C and 280°C gave a mixture of carboxylic acids with a yield of > 95%. The identified 50 carboxylic acids included both hydroxy monocarboxylic acids and dicarboxylic acids; their routes of formation are discussed. Among the main compoun…
Polystrene modification of chemical resistance modification of impact properties - of average density and thermoinsulating properties - of durability - of flammability - of electrical conductivity - of rheological properties - of strength characteristics - of heat resistance.
The Plasticity of single crystals of MgSiO 3 perovskite was studied (at room temperature) by the microhardness tests using a Vickers and a Knoop indenter. The Vickers hardness, H v , of MgSiO 3 perovskite was determined to be 18 +/− 2 GPa, about a factor of two larger than the hardness of either enstatite or olivine,…
Vacuum UV circular dichroism spectra measured down to 178 nm for hexameric 2-zinc human insulin, zinc-free human insulin, and the two engineered and biologically active monomeric mutants, [B/S9D] and [B/S9D,T27E] human insulin, show significant differences. The secondary structure analysis of the 2-zinc human insulin…