Materials Literature
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An esterase hydrolyzing phthalate esters has been purified from Micrococcus sp. YGJ1. The enzyme, a monomeric protein (Mr = 56 kDa) with a pI of 4.0, hydrolyzes various aliphatic and aromatic carboxylesters. The medium chain (C3-C4) esters are the most preferred substrates. The enzyme is inhibited by HgCl2 and p-chlor…
Characteristic dark domains are observed around the tips of electrodes in in-plane switching-mode liquid crystal displays. In these domains, the liquid crystal molecules rotate in the reverse direction because of the radially distorted electric field. We found that these domains extend toward the central area when a h…
In Sweden, high level radioactive waste will be disposed of in a canister with a copper outer and a cast iron or carbon steel inner. If the iron insert comes into contact with anoxic geological water, anaerobic corrosion leading to the generation of hydrogen will occur. This paper presents a study of the anaerobic cor…
CdS nanoparticles have been synthesised by thermolysing Cd(SCNHNH2)2Cl2 in tri-n-octylphosphine oxide (TOPO) at 230 °C. The optical properties and structural characteristics of the particles are reported.
Superplastic behavior was examined in fine-grained (∼2 \\micron) WE43 magnesium alloy, that contained, within its grains, spherical precipitates with a diameter of ∼200 nm. The material exhibited superplasticity with an elongation-to-failure of over 1000% at a temperature of 673 K and a strain rate of 1×10−4 s−1. Larg…
Electrochemical oxidation of PTMA[MIII(Pc)(CN)2] (PTMA = phenyltrimethylammonium, Pc = phthalocyaninato, and M = Co or Fe) gives partially oxidized salts (PTMA)x[MIII(Pc)(CN)2]·y(solvent) (solvent = acetonitrile or acetone). The obtained crystals in which the solvent molecules partially occupy the cationic sites are i…
Regenerated cellulose (RC)/alginic acid (AL) blend membranes were satisfactorily prepared from 6 wt % NaOH/4 wt % urea aqueous solution by coagulating with 5 wt % CaCl2 aqueous solution, and then treated with 3 wt % HCl. Morphology, crystallinity, mechanical properties, and thermal stability of the membranes were inve…
Electrode Reaction of La1 − x Sr x CoO3 − d Cathodes on La0.8Sr0.2Ga0.8Mg0.2 O 3 − y Electrolyte in Solid Oxide Fuel Cells , Horita, Teruhisa, Yamaji, Katsuhiko, Sakai, Natsuko, Yokokawa, Harumi, Weber, André, Ivers-Tiffée, Ellen
The effect of adding dilute electrolytes to the synthesis of non-ionically templated [Si]-MSU-X mesostructures has been investigated. An assembly process, (N0M+)(X−I0), is described that takes into account both the non-ionic template/electrolyte and the silicate/electrolyte interactions. Monovalent cations (H+, Li+, N…
Research Article| January 01, 2001 Zeolites in Soil Environments Douglas W. Ming; Douglas W. Ming Mail Code SN2, NASA Johnson Space Center, Houston, Texas 77058 Search for other works by this author on: GSW Google Scholar Janis L. Boettinger Janis L. Boettinger Department of Plants, Soils, and Biometeorology, Utah Sta…
Functionalized tri- (A2B-type) and tetra- (A2BC-type) meso-substituted asymmetric porphyrins bearing highly reactive centers like -NH2, -OH, -CCH, -CHO in substituents at the meso positions were synthesized in good yields via the reaction of 5,15-diphenylporphyrin with corresponding functionalized organolithium reagen…
The Heusler-type Fe2VAl compound exhibits a semiconductor-like behavior with the resistivity reaching 30 \\microΩm at 2 K . Recent band-structure calculations predict that Fe2VAl is a nonmagnetic semimetal with a sharp pseudogap at the Fermi level. The existence of a pseudogap is experimentally confirmed in optical co…
Upon excitation by long wavelength UV radiation, strong room temperature luminescence is observed in a family of metal-activator-free zeolite-type materials; the luminescent output from the large cage UCSB-8Mg structure is independent of temperature from 298 K until at least 77 K.
Ethylene-vinyl alcohol copolymers (EVOH) were prepared by the conventional saponification of poly(ethylene-co-vinyl acetate) using a solution of potassium hydroxide in ethanol. An organic fungicide, consisting of a 2-benzimidazole carbamoyl (CBZ) group supported on EVOH (EVOH-CBZ), was prepared by the transesterificat…
Four different kinds of chitosans were prepared by treating crude chitin with various NaOH concentrations. The antimicrobial activities of the chitosans were tested against four species of food spoilage microorganisms (Lactobacillus plantarum, Lactobacillus fructivorans, Serratia liquefaciens, and Zygosaccharomyces ba…
The aim of this study is to determine the minimum amount of dopant that prevents the occurrence, near room temperature, of a Jahn–Teller (J–T) transition in the M-doped lithium manganese spinel of composition Li1.02MxMn1.98−xO4 with 0.00<x⩽0.06 and M = Ni2+, Co3+, Cr3+ or Ti4+. EPR spectra and magnetic susceptibility…
A simple method for the rapid electrochemical characterization of solid oxide fuel cell (SOFC) anodes is presented. Current-potential and impedance measurements have been performed at operating temperature in a simplified manner using unsintered ceramic electrodes. Results for materials with different crystal structur…
Image analysis of water drop patterns on an inclined flat polymeric insulator surface has been performed in order to find a simple mathematical function that indicates the level of hydrophobicity of the insulator surface. A simple function, given the acronym average of normalized entropies (ANE), seems to correlate we…
X-ray photoelectron spectroscopy (XPS) has been employed to investigate the protonation degree of polyaniline doped with dodecylbenzenesulfonic acid (Pani. DBSA) obtained by different synthetic methods. The protonation degree has been compared to electrical conductivity. Pani.DBSA prepared through the redoping process…
This work studies the chemical composition of copper tarnish products formed at 40, 60, and 80% relative humidity (RH) in an uncontaminated environment, for 21 days experimentation at 30°C. The experimental method used was X-ray photoelectron spectroscopy (XPS) in conjunction with -ion sputtering. The main compounds f…