Materials Literature
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The synthesis of new 6-deoxy-6-trialkylammonium cellulose derivatives obtained by nucleophilic displacement reactions of p-toluenesulfonyl celluloses with various amines is described. Water soluble cellulosics could be prepared using a N,N-dimethylformamide/water mixture as the reaction medium. Detailed studies concer…
This paper reports the development of a high sensitive CaSO4 : Dy thermostimulated luminescence (TLD) phosphor prepared by a new (N) inexpensive technique. Scanning electron microscope photographs reveal that its crystal morphology is quite different from the presently used CaSO4 : Dy (P). The TSL sensitivity of N (<7…
Kinetic information on soil P release is required to optimize P fertilizer use efficiency in agricultural production and develop guidelines for the disposal of P‐rich wastes onto the land. We determined the kinetics and energy changes of P release from tropical soils by mixed ion‐exchange resin. Phosphate release patt…
We report a “ship-in-a-bottle” synthesis where encapsulation of copper phthalocyanines (CuPc) into mesoporous channels of silicate MCM-41 was achieved by chemical vapor deposition (CVD) using 1,2-dicyanobenzene (DCNB). Silanol protons of MCM-41 were ion-exchanged with copper ions before CVD, and when the initial amoun…
A photoalignment technique has been utilized for fabricating zigzag-defect-free ferroelectric liquid crystal displays (FLCDs) using polyimide RN-1199, -1286, -1266 (Nissan Chem. Ind.) and adopting oblique irradiation of unpolarized UV light. A rubbing technique was also utilized for comparison. It is shown that among…
Aqueous alteration of five Ti-Zr-oxide-based ceramics containing elements simulating long-lived radionuclides was studied experimentally by leaching at 90 °C in deionized water for more than one year under conditions of high solid/liquid ratios. Four of these ceramics were synthesized by coldcrucible melting (two Synr…
Densification of exchange-spring magnet ribbons of Nd/sub x/Fe/sub 85-x/Co/sub 8/V/sub 1/B/sub 6/ (x=7-11) alloys has been investigated. The starting ribbon powders containing amorphous parts were prepared by melt spinning and were compacted by using a spark plasma sintering (SPS) method. SPS is a type of solid compre…
We report a new and cost-effective approach to prepare (15)N/(13)C labeled proteins for NMR using the Pichia pastoris expression system. Four protocols (P1 to P4) were defined and compared using recombinant Ovine interferon-tau (rOvIFN-tau). Our results demonstrate that in order to get full incorporation of (15)N and…
Different starch types (corn, rice, potato, corn amylose and corn amylopectin) were phosphorylated to varying degrees of substitution (DS) and tested both for acid hydrolysis during 3 h in a boiling bath and for enzymatic hydrolysis with a thermostable bacterial α-amylase (Bacillus licheniformis) for 30 min at 95 °C.…
In contrast to films grown on spinel structure substrates, epitaxial cobalt ferrite films grown on MgO substrates provide a model system to study the effects of microstructural defects on the magnetic properties. The anomalous magnetic behaviors observed in as-grown films are explained by the structural and magnetic d…
We have performed molecular dynamics simulations of aqueous solutions of poly(ethylene oxide) (PEO) in order to investigate the influence of water on polymer dynamics as a function of solution composition. Simulations were performed on 12 repeat unit PEO chains (530 Da) at 318 K covering a composition range (polymer w…
The high-temperature phase (X2-phase) and the low-temperature phase (X1 phase) of a potential low-voltage blue phosphor Y 2 SiO 5 :Ce have been studied. It is observed that as the concentration of Ce increased, the emission band of the X2 phase was shifted to the longer wavelength, toward the emission band of the X1 p…
A new approach to calculate the surface charge density in semiconductor metal-oxide quantum dots (QDs) dispersed in alkaline aqueous colloids, at different pH values, is presented. Surface charge density up to about 0.3 C/m/sup 2/ was obtained for spherical nanoparticles in the diameter range of 8 to 14 nm, at pH 10 a…
A systematic study has been undertaken to understand the evolution of microstructure, microchemistry, and coercivity of sintered Sm(Co/sub bal/Cu/sub 0.06/Fe/sub 0.015/Zr/sub 0.027/)/sub 6.4/ magnets with heat treatment using magnetometry, transmission electron microscopy, Lorentz microscopy, and nanoprobe chemical an…
MMIC circulators operating at K/sub A/-band have been fabricated from single crystal and polycrystalline hexaferrite platelets integrated into glass-microwave integrated circuit wafers. Measurements on circulators utilizing single crystal BaFe/sub 11.1/Sc/sub 0.9/O/sub 19/ showed two-band circulation, below-FMR (at 36…
This paper presents experimental results for the multiple microcracking and tensile behavior of an orthogonal 3‐D woven Si‐Ti‐C‐O fiber (Tyranno™ Lox‐M)/Si‐Ti‐C‐O matrix composite with a nanoscale carbon fiber/matrix interphase and processed using a polymer impregnation and pyrolysis route. Based on microscopic observ…
Silsesquioxanes obtained by the hydrolytic condensation of (3-glycidoxypropyl)trimethoxysilane (GPMS) in diglycidyl ether of bisphenol A (DGEBA) were characterized by electrospray ionization time-of-flight mass spectrometry (ESI-TOF MS) and matrix-assisted ultraviolet laser desorption/ionization time-of-flight mass sp…
Sm/sub 2/(Co,Fe,Cu,Zr)/sub 17/ type magnets are unique high energy product magnet materials for applications at temperatures higher than 200/spl deg/C. These magnets have (BH)/sub max/ values up to 32 MGOe at 25/spl deg/C and up to 26.5 MGOe at 200/spl deg/C. A new, recently introduced class of these Sm-TM 2:17 type m…
The measurement of the current in industrial electrical devices is often carried out by current transformers. The reliability of these devices is compromised when the measured current is higher than the nominal value, due to the saturation and hysteresis effects of the magnetic core. In this paper, a nonlinear model o…
The activation energies for olefin epoxidation with Mimoun-type η2-peroxo complexes have been calculated using density functional methods. Six degrees of freedom of the complex [MOL(O2)(OER3)] and the olefin CH2CHR′ have been systematically modified. The calculations were based on the assumptions that the reaction fol…