Materials Literature
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Abstract Chitosan has been modified by polyacrylate sodium or acrylate sodium in the presence of glutaraldehyde, which afforded four kinds of modified chitosan (CTS‐PA) with different ratios of reacting substance. They are used as an environmentally benign polymer adsorbent. The adsorption properties of these CTS‐PA t…
A solid oxide fuel cell (SOFC) is expected to be applied to the distributed energy systems because of its high thermal efficiency and exhaust gas utilization. The exhaust heat from the SOFC can be transferred to the electric power by a gas turbine and the high efficiency power generation can be achieved. In this paper…
In this article, the results of an investigation on solid propellant grains considering the effect of Poisson's ratio v under thermal loading are presented. Traditionally the v value of solid propellant grains is assumed to be a constant (e.g. 0.4999) for engineer, but the real v value is dependent on the real chemica…
Extending the effective medium approximation with the fractal theory for describing nanoparticle clusters and their radius distribution, a predictive model is proposed for the effective thermal conductivity of nanoparticle suspension, combined with the consideration of size effect and surface adsorption effect of nano…
Serious environmental concerns are being raised with respect to at high Total Dissolved Solids (TDS) contents in spent leather processing liquors. Pickling alone contributes about 35% TDS in the effluents. As cost effective treatments for TDS are not yet available, in-plant control has become a necessity. In the prese…
The results of dielectric response studies of the biocellulose show that two relaxation processes can be distinguish: the local main chain motion at ∼200 K and an orientational motion in a mixed phase of polysaccharide and water at ∼325 K. The electroacoustic parameters of a loudspeaker with biocellulose membrane were…
The reaction mechanism of the chloruration of MgO particles suspended in a molten salt bath containing magnesium chloride by HCl gas was studied. Chloruration was carried out in batches in a laboratory scale stirred tank reactor. The determination of the MgCl2 concentration as a function of chloruration time indicated…
Cost reduction of rechargeable nickel/metal hydride (NiMH) batteries is an important and challenging issue. We report here a multicomponent, low-cobalt -type hydrogen storage alloy stabilized by an inert second phase for use in low-cost, high-performance NiMH batteries. X-ray diffraction and scanning electron microsco…
We obtained polymer dispersed nematic liquid crystal films E7/PMMA. The thermally stimulated depolarization current (TSDC) measurements indicate a space charge limited current. Conduction of electronic type was proven and we measured the value of the activation energy, specific to the conduction process. Optical measu…
SERS and FTIR spectra of M and S composites, provided by adding of single-walled carbon nanotubes(SWNTs)to the polyaniline(PANI)solution and chemical polymerization of aniline, respectively are different. The difference originates in the irreversible transformation of SWNTs in the polymerization medium. This explains…
A general synthetic route to porphyrin-substituted uridine and 2'-deoxyuridine using Sonogashira coupling with acetylene porphyrins is presented. Both diphenyl and tetraphenyl porphyrins, as free base or zinc metallated, can be attached to the nucleobase. Selective TBDMS protection of the deoxyribose does not affect t…
Surface crystallization was induced in Ge-doped silica glass samples from a graded-index optical fiber preform by re-heating them at 1100 degrees C for several hours. X-ray diffraction and second-harmonic generation (SHG) microscopy have been utilized to investigate the crystalline phases formed. Experimental results…
In the paper we propose and test a "gel-drying" method of obtaining porous oxide glasses in Molecular Dynamics (MD) simulations. The simulation is started with low (screened) values of ionic charges. Then, the charges are gradually increased (to mimic the gradual elimination of a polar solvent) up to full ionic charge…
Potassium niobate ceramics substituted by the Ti and V ions are prepared and the dielectric, structural and vibrational properties are investigated. These substitutions didn't change the orthorhombic structure of pure potassium niobate. The Curie temperature has shifted to low temperature in the titanium substituted s…
N , N ′ - Bis (3-pyrrol-1-yl-propyl)-1,6,7,12-tetrakis(4- tert -butylphenoxy)perylene-3,4,9,10-tetracarboxylic acid diimide (PDI-2Py) was synthesized by imidization of 3-pyrrol-1-yl-propylamine and 1,6,7,12-tetrakis(4- tert -butylphenoxy)perylene-3,4,9,10-tetracarboxylic acid dianhydride. PDI-2Py could be electrodepos…
Wheat straw(WS), sorghum straw(SS), Cane bagasse fiber(CBF)and teak saw dust(TS)composites were prepared separately with novolac resin in 50:50(w/w)ratio. These fillers were treated with and without maleic anhydride(MA), phthalic anhydride(PA)and succinic anhydride(SA). Anhydrides treatment improves tensile strength,…
Hydrogen adsorption and absorption on carbon materials play an important role in plasma surface interactions in thermonuclear controlled fusion devices. The Density Functional Theory has been used in order to investigate the interaction of hydrogen atoms with the basal (0001) plane of pure graphite and boron-doped gra…
There is a growing need for eco-benign tanning systems owing to stringent environmental regulations. In this present study, a new combination tanning system using zinc, tannic acid and silica has been explored for the manufacture of garment leathers. The amounts of zinc, tannic acid and silica used have been optimised…
Two different pseudosymmetry-search methods are compared and applied in the search for new ferroelectrics among the binary, ternary and quaternary compounds of Pna21 symmetry. Among the 322 compounds with this symmetry, 18 candidates for ferroelectrics are detected.
By RF sputtering on a MgO [100] substrate, we have made Fe/sub 3/O/sub 4/ [111] metal and Fe/sub 3/O/sub 4/ [001]/TiN [001] films that have Verwey temperature (T/sub V/) near 120 K. The saturation magnetizations and resistivities of those Fe/sub 3/O/sub 4/ films were comparable to those of bulk Fe/sub 3/O/sub 4/, and…