Materials Literature
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The use of amorphous silica-supported titanium catalysts in which the titanium ions display a chemical environment similar to that of Ti-substituted zeolites, afforded excellent activity in the epoxidation of terminal linear and bulky alkenes with dilute solutions of hydrogen peroxide.
Chitin was dissolved in N, N-dimethylacetamide/5% lithium chloride (DMAc/5%LiCl) to form a 0.5% chitin solution. Chitin beads were formed by dropping the 0.5% chitin solution into a nonsolvent coagulant, ethanol. The beads were left in ethanol for 24 h to permit hardening, consolidation, and removal of residual DMAc/5…
The space charge distribution in low-density polyethylene (LDPE) was measured with the pulsed electroacoustic (PEA) method. We used three types of LDPE: LDPE-L and LDPE-H were prepared by the high pressure process, and m-LDPE was polymerized with a metallocene catalyst. Space charge in LDPE strongly depended upon the…
Dynamic mechanical properties and microstructure of an organic hybrid consisting of chlorinated polyethylene (CPE) and 3,9-bis[1,1-dimethyl-2{β-(3-tert-butyl4-hydroxy-5-methylphenyl)propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) were investigated. The AO-80 clearly exhibited two second-order transiti…
The tensile stress–strain and recovery behavior of all the four commercial varieties of Indian silk fibers, namely Mulberry, Tasar, Eri, and Muga, have been studied along with their structures. Compared to the non-Mulberry silk fibers, Mulberry silk fiber is much finer and has crystallites of smaller size, higher mole…
Magnetic diffuse scattering in the Zn-Mg-Ho icosahedral quasicrystal has been studied by neutron scattering over a wide $\mathit{Q}$ range using a single-quasicrystalline sample. It was found that the diffuse scattering obeys the icosahedral symmetry, and appears as satellite peaks of the intense nuclear Bragg reflect…
The 1H NMR signal of a proton of a spiropyran photomerocyanine was resolved at low temperature into two signals attributed to the two isomers, TTT and TTC. The equilibrium distribution and free energy difference between the TTT and TTC isomers were calculated to be 0.15 and 4.6±0.7 kJ mol−1, respectively. By 1H NMR li…
Microscopical imaging of natural, unstressed draglines or of untreated bulk samples showed two types or threads with diameters of either approximately 1-2 microm or 4-5 microm, which could be identified as products of the minor or major ampullate glands. The threads had a circular profile in serial cross sections and…
Cobalt hydroxide with an interlayer spacing of 7.53 Å and needle-like morphology has been synthesized with the aid of ultrasound radiation. Characterization by powder X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, FT-IR spectroscopy, as well as elemental analysis, indicates the format…
The problem of premature failure of low voltage rotating machines fed by inverters could have serious economic impact if it is not addressed. Indeed, even though much already has been written on the different topics related to the use of such power supplies, there is a great need for a better understanding of the phys…
Selected phosphorus-containing flame retardants, including some intumescents, have been formulated with selected resins and applied as back-coatings to both cotton and cotton–polyester (35:65) blended fabrics. While all formulations raise the limiting oxygen index, only those based on ammonium polyphosphate and a cycl…
Polypyrrole films possessing regular macropores interconnected through size-controlled holes have been prepared by electrochemical oxidation in the presence of ordered arrays of silica spheres as templates.
In order to investigate the in vivo substrate specificity of the type I polyhydroxyalkanoate (PHA) synthase from Ralstonia eutropha, we functionally expressed the PHA synthase gene in various Escherichia coli mutants affected in fatty acid beta-oxidation and the wild-type. The PHA synthase gene was expressed either so…
This article summarizes a series of experiments to determine the influence of Mg on the corrosion and electrochemical behavior of Al. Magnesium is commonly added to increase the strength of lightweight nonheat treatable Al alloys. However, these alloys are susceptible to grain boundary dissolution, stress corrosion cr…
The aim of this work is the surface study of the CexZr1−xO2 system, one of the main components of the last generation of three-way catalysts. By Fourier transform infrared spectroscopy and using several probe molecules we have tried to characterize surface sites (OH and methanol), acid (CO and pyridine) and basic (CO2…
Two FeII-based molybdenum polycyanides, Fe2[MoIII(CN)7]·8H2O and [Fe2(H2O)4][MoIV(CN)8]·4H2O, have been synthesized. The compound [Fe2(H2O)4][MoIV(CN)8]·4H2O crystallizes in the tetragonal system, space group I422. There are two molybdenum sites in a distorted square antiprism arrangement, each site being surrounded b…
Fine-grained structure formation taking place in a 304 type austenitic stainless steel was studied in multiple compression at a temperature of 873 K (0.5Tm) under a strain rate of about 10−3 s−1. The integrating flow curve shows a maximum in flow stress at strains around 1.5 followed by a minor strain softening at cum…
Polyurethanes based on poly(caprolactone) (PCL) diol, hexamethylene diisocyanate, 4,4′-diphenylmethane diisocyanate and hexamethylene diamine were modified by hydrophilic segments, diol-terminated poly(ethylene oxide) or dimethylol propionic acid (DMPA). Differential scanning calorimetry, dynamic mechanical tests, ten…
Fourteen compounds based on 2,6-disubstituted naphthalenes or related 1-benzothiophene moieties with butylsulfanyl and cyano or isothiocyanato terminal groups have been synthesised. The transition temperatures of the compounds and their refractive indices have been determined and the derived values for the optical ani…
The combustion technique produces ionically dispersed Ag on a nano-crystalline CeO2 surface. The catalysts thus produced were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Catalytic properties towards NO reduction, CO and hydrocarbon oxidation have been inve…