Materials Literature
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Liquefied benzylated wood based Polyurethanes (PUs) are synthesized with excess toluene diisocyanate (TDI), isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI). Four polyethylene glycols (PEG) of molecularweight 400, 600, 1000 and 2000 are mixed with liquefied wood using dibasic ester (DBE) as liquefac…
Density Functional (B3LYP/LANL2DZ) calculations for ammonia metal clusters were done in order to obtain bond lengths, M-N stretching vibrational modes, binding energies, Mulliken atomic charges and adiabatic ionization potentials. The results indicate that copper atom forms stronger bonds with ammonia than silver or g…
Abstract Pulsed and continuous‐wave (CW) lasers were compared as excitation sources for surface‐enhanced resonance Raman scattering (SERRS). CW excitation provided SERRS spectra with a greater signal‐to‐noise ratio and more sensitive detection by a factor of ∼50 compared with the high peak power, low repetition rate p…
Abstract CP (Cetylpyridinium)-exchanged smectite was manufactured by the cationic exchange reaction of Na-smectite with CP. The adsorption behaviour shows a typical L-type isotherm representing continuous and stable adsorption in excess of twice the cation exchange capacity of CP. CP-smectite shows a strong interlayer…
Martensitic phase transformation from the β to the α'' phase (and vice versa ) in a TiNbAl alloy system has been studied by ultrasound spectroscopy. Resonance frequencies and corresponding internal frictions are measured from ambient temperature to 12 K by electromagnetic acoustic resonance (EMAR) and resonant ultraso…
Novel photochromic chemosensors for alkali-, alkali-earth and d-metal cations were synthesized and their photochemical and complexing properties investigated with the use of UV/vis, IR, 1H/7Li NMR spectroscopy and quantum chemical calculations – DFT(B3LYP/6-31G).
Abstract We report here the first electrochemical method to prepare a roughened gold substrate with bimetallic silver and gold nanoparticles. First, a silver substrate was roughened by a triangular‐wave oxidation–reduction cycle in 0.1 N HCl aqueous solutions. Silver‐containing complexes were found in the solution aft…
We have proposed two methods for measuring liquid crystal response times using a microwave resonance method and an optical transmitted light measurement method. In this paper, the response time characteristics for the paralleled nematic and twisted nematic liquid crystal layer structures were investigated by using two…
The temperature dependence of the piezoelectric properties of0.67Pb(Mg 1/3 Nb 2/3 )O 3 -0.33PbTiO 3 and 0.955Pb(Mg 1/3 Nb 2/3 )O 3 -0.045PbTi03 single crystals, respectively grown by Bridgman and modified Bridgman method was investigated. Due to their low rhombohedral to tetragonal transition temperature (T n = 90°C a…
The corrosion of carbon steel in contact with synthetic calcareous natural waters containing sulphate ions was investigated. Since the diffusion process is a determining factor in the corrosion kinetics through the reduction of dissolved oxygen, use was made of a rotating disc electrode. The development of the open ci…
Die bei thermischen und katalytischen Spaltprozessen anfallenden n-Butengemische werden u. a. als Edukt für Verfahren der Oligomerisierung eingesetzt. Dabei entstehen beim Einsatz von Festkörpersäurekatalysatoren Oligomerisate mit hohen Anteilen an verzweigten Olefinen, die nach Stabilisierung als Vergaserkraftstoff-…
Cr–SiC composite coatings were plated in Cr(VI) baths containing SiC green powder. Analysis of Cr–SiC coatings has demonstrated a relatively low percentage (about 0·1–0·9 wt-%) of the particles incorporated into the Cr coating. XPS data suggest that the surface of SiC was covered with a layer of SiO2 formed as a resul…
Abstract The tensile behaviour of fully degummed filaments of two commercial varieties of silk produced in India, namely mulberry (Bombyx mori) and tasar (Antheraea mylitta), has been investigated in dry and wet state. The tensile properties were correlated with the structures and morphologies of these two varieties o…
Several diarylethene derivatives having various substituents at the reactive carbons were prepared and the quantum yields were measured. Although the cyclization quantum yields were scarcely affected by the introduction of substituents, the cycloreversion quantum yields varied depending on the substituents.
From the changes in energy band, density of state (DOS) and electronic structure calculated by the DFT/B3LYP method, the conductivity of carbon doped boron-nitride nanotube (BNNT), which is formed by C-C bond substituting B-N bond, was discussed. The results indicate that the substitution will strengthen the conductiv…
Classical molecular dynamics simulations and density functional theory calculations are performed to obtain insights about the attachment of the copper(II) ion to the lowest generation poly(amido-amine) dendrimer, G0-OH, in aqueous solutions. Various initial configurations of the ion relative to the dendrimer sites ar…
The size and severity of grinding machining cracks in a sintered reaction bonded silicon nitride are compared to data for other silicon nitrides. Crack sizes follow a similar trend with grinding wheel grit size despite differences in microstructures, strengths, and fracture toughnesses. Silicon nitrides with enhanced…
A model is presented to predict the decarburization rate of electrical steels during reactive annealing. In a first step, the warm annealing atmosphere composition is calculated as function of the composition of the cold gas containing N2-H2-H2O-CO-CO2-CH4-O2. In a second step, the decarburization kinetics, which is c…
Abstract Shaped charges with different angles or/and different liner wall thicknesses have been tested against an explosive reactive armor sandwich. The reason was to find out if more robust shaped charges give more residual penetration against an ERA sandwich, compared to shaped charges with more penetration performa…
In a series of oxides RFe 2 O 4 (R = rare earth between Dy and Lu, or Y), equal numbers of Fe 2 + and Fe 3 + are located on a layer composed of two triangular nets stacked together. These oxides have several phase transitions where the arrangement of Fe 2 + and Fe 3 + ions transforms from one type to another. Unique d…