Materials Literature
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We present analytic calculations of minor hysteresis loops obtained when a sample is subjected to a time-varying field B(t)=${\mathit{B}}_{\mathrm{dc}}$+${\mathit{B}}_{\mathrm{ac}}$ cos\ensuremath{\omega}t. We enumerate eight classes of minor hysteresis loops, and calculations are done within the critical-state model…
Semicrystalline structures involving molecular packing and optimized chain conformations of three polyimides have been obtained with the charmm molecular-dynamics program, and their densities calculated. An eclipsed conformation of face-to-face stacking of polymer chains with a relative shift is observed, and the shif…
Experimental results of the effects of cold work on the corrosion of mild steel in a simulated, aqueous sour gas well environment are reported. The steel was cold rolled from 10% to 70% in increments of 10%. Detailed electrochemical kinetic analysis of the experimental data was conducted in an attempt to understand th…
SUMMARY Fast secondary electrons (FSE), which result from inelastic scattering of incident electrons, are known to generate a significant number of X‐rays for light elements, and also to degrade the spatial resolution of X‐ray microanalysis in thin foils. A Monte Carlo program simulating the generation and diffusion o…
An inorganic chemistry experiment has been developed combining two topics usually included in inorganic chemistry: heteropoly ions and mechanisms of oxidation-reduction reactions of transition metal ions.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled structure methacrylic copolymers as dispersants for ceramics processingH. S. Al-Lami, N. C. Billingham, and P. D. CalvertCite this: Chem. Mater. 1992, 4, 6, 1200–1207Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published i…
The deposition of hydrogenated amorphous silicon and diamond can be achieved using plasma‐enhanced chemical vapor deposition. In order to optimize the deposition process and thus the property profiles of the materials obtained it is important that the gas‐phase and surface reactions are understood. The modeling method…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDegradation of poly(vinyl chloride) with increased thermal stabilityMikael Rogestedt and Thomas HjertbergCite this: Macromolecules 1992, 25, 23, 6332–6340Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992h…
Abstract An overview is given on auto‐photosensitive polyimides as introduced for the first time in 1985. It is shown how development proceeded and how the chemical basis of auto‐photosensitive polyimides was extended beyond BTDA. Novel “photosensitizer tetracarboxylic dianhydrides” like 2,3,6,7‐thioxanthonetetracarbo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifference ultraviolet spectroscopic studies on the binding of lanthanides to human serum transferrinWesley R. Harris and Yong ChenCite this: Inorg. Chem. 1992, 31, 24, 5001–5006Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published…
A model-based approach to the first-principles study of ferroelectric phase transitions is described. Formal relationships of the various possible models to the full crystal Hamiltonian and connections to phenomenological models in the literature are examined. Specific considerations for application to the perovskite…
Phosphorylation of glial fibrillary acidic protein (GFAP) induces disassembly of the filaments. An amino-terminal fragment of bovine GFAP (G-Hf) was produced by lysylendopeptidase digestion. G-Hf formed ribbon-like filaments in the presence of GFAP even in low ionic strength, whereas the fragment itself did not form a…
Crack tip shielding is evaluated for observed transformation zones in Ce‐TZP/Al 2 O 3 composites, in which the transformation zone sizes were changed significantly by varying the sintering temperature to control the transformation yield stress. The calculated shielding effects are consistent with an observed insensiti…
Potentiodynamic polarization curves were measured for Type AISI 304 and 316 stainless steels in solution at 4, 20, and 40°C. The pitting potentials decreased with increasing temperature. A positive effect on the inhibition of passivity breakdown was found in the presence of molybdenum. Surface enhanced Raman spectrosc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel mixed-valence selenium(IV)/selenium(VI) oxo compound: crystal structure determination and x-ray absorption near edge structure study of erbium selenite(IV) selenate(VI) hydrate, Er(SeO3)(SeO4)1/2.cntdot.H2ORussell E. Morris, Angus P. Wilkinson, and Anthony K. Cheetha…
The complex Young’s modulus, E*(ω), and the complex strain-optical coefficient, O*(ω), of poly(α-methyl styrene), PMS, and Bisphenol A polycarbonate, PC, were measured over the frequency range of 1–130 Hz around the glass-to-rubber transition point. The real part of O*(ω), O′, of PMS is negative over the entire temper…
Abstract Relevant developments in polymer blends based on immiscible products have shown how efficient the amphiphilic species are in improving mechanical properties and morphological stabilization throughout successive processing steps. However, it appears that the amount of compatilizer that has to be introduced for…
In order to evaluate the crystallization tendency of glasses, the ratio of the crystallization temperature to the liquidus temperature ( T c / T L ) was obtained by DTA measurement for the Na 2 O–B 2 O 3 and Na 2 O–B 2 O 3 –Al 2 O 3 systems. The critical cooling rate for glass formation ( Q *) was also measured. The m…
Infrared reflection absorption spectroscopy has been used to study the chemisorption of fluorine (by exposure to XeF2) on polycrystalline Si surfaces in ultrahigh vacuum and under low-pressure steady-state conditions. Adsorption at 300 K leads to the sequential formation of mono-, di-, and trifluoride SiFx groups. Ann…
The thermal unfolding of ribonuclease T1 has been studied by high-sensitivity differential scanning calorimetry as a function of temperature, [GuHCl], and scanning rate. The destabilizing effect of GuHCl has revealed that the kinetics of the unfolding transition become extremely slow as the transition temperature decr…