Materials Literature
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ABSTRACT The effect of heating film‐forming solutions on physical and molecular properties of cast wheat gluten (WG) films was determined. Glycerol‐plasticized films were cast from alkaline (pH 10), heat‐treated (55,75, or 95°C for 10 min) solutions of WG in aqueous ethanol. Protein solubility (PS) of films in water d…
The isolation of poly-(L-lactide) (PLA)-degrading microorganisms was investigated. A PLA-degrading actinomycete, strain No. 3118, was isolated and tentatively identified as a member of the genus Amycolatopsis. The optimum conditions for degradation of PLA were 43 degrees C at about pH 7 in a mineral salt medium with a…
Aluminium-copper of (99.99%) high purity eutectic alloy was melted in a graphite crucible under vacuum atmosphere. This eutectic alloy was directionally solidified upward with a constant growth rate V, and different temperature gradients G, and also with a constant temperature gradient and different growth rates in th…
A pilot study was conducted to assess the potential for using southern pine particles derived from construction waste to create a cement-wood composite suitable for exposed structural applications. Panels fabricated from copper chromium arsenate (CCA)-treated as well as untreated particles were cut into individual sam…
Direct measurement of electric machine losses using the principle of the calorimetric method is described in this paper. The design and construction of a double chamber calorimeter (DCC) that can be used for measurement of harmonic losses of a 7.5 kW cage induction motor is discussed. The advantages of this approach a…
It is investigated how the reinforcement of elastomers by active fillers (e.g. carbon black) is influenced by the universal features of the disordered filler structure. This is done for three reinforcement mechanisms on different length scales, corresponding to different interactions within the filled system.
Among six grades of polyvinyl alcohol (PVA), PVA V (degree of hydrolysation 99.45%, molecular weight 140000-150000) and PVA VI (degree of hydrolysation 98-99%, molecular weight 85000-146000) were selected for combination with PVA I (degree of hydrolysation 99%, molecular weight 17300) to prepare composite films with d…
Integrated photonic radio frequency (RF) phase shifters with dc voltage control have been realized using a nested dual Mach-Zehnder modulator configuration in a new nonlinear optical polymer, CLD2-ISX. These modulators have a V/sub /spl pi// of 10.8 V and exhibit excellent frequency performance measured up to 20 GHz.…
We present first-principles calculations of the bonding properties for the series of boron compounds BP, BAs, and BSb. The plane-wave pseudopotential approach to density functional theory in the local density approximation has been used to calculate the equilibrium properties, i.e., the ground-state energy, the lattic…
By reacting an aqueous solution of ammonium heptamolybdate with formic acid in the presence of hydrazinium sulfate at pH ≈ 4.2 the compound (NH4)42[MoVI72MoV60-O372(HCO2)30(H2O)72]·xHCO2Na·yH2O 1 (x ≈ 30, y ≈ 250) with spherically shaped stable cluster anions is obtained; owing to the spherical shape of the cluster–sh…
The grafting of cysteine to polypyrrole(PPY)-coated platinum and titanium substrates has been investigated with the aim of developing innovative bioactive materials of interest for bone implants. Polypyrrole has been chosen as the coating polymer because of its suitability to be electrochemically grown directly onto m…
The fabrication of high aspect ratio macropore arrays on p‐type silicon under optimum anodization conditions is demonstrated. The depth of the macropore can reach with an aspect ratio of 100. The thickness of the pore wall is . Presence of cationic surfactant in the electrolyte protects the pore walls and promotes the…
The electrochemical devices based on conductive stabilized by ceramic oxides are the most employed in chlorine‐alkali cells. Their efficiency is influenced by many variables, among which the chemical nature of the stabilizer oxide plays a considerable role. In this paper, morphology, microstructure, and electrocatalyt…
The synthesis and solvent-dependent second-order polarizability, β, responses of three new platinum(II) chromophores are reported. A strong correlation between the metal chromophore electronic structure and the second-order polarizability is observed that substantiates the use of the two-state model to design, optimiz…
The molecular first hyperpolarizabilities (β) and electronic properties of some tetra-substituted benzenes/pyrazines which can be described as 1,2-didonor-4,5-diacceptor-benzenes/2,3-didonor-5,6-diacceptor-pyrazines have been investigated by employing an AM1/FF and ZINDO/S-CI approach. It is found that these multiple…
Novel dye containing transparent hydrogels responding to changes in temperature with reversible color changes (thermochromism) are presented. The betaine dye 2,6-diphenyl-4-(2,4,6-triphenylpyridinio)phenolate (DTPP), and the well known indicator dye Cresol Red ( Fig. 1 ) exhibit an outstanding thermochromism, if they…
Absorbable biomaterials have been recently incorporated into the field of tissue engineering. Little work has been performed, even with the clinically acceptable absorbables, concerning their tissue promoting capability or lack, thereof. Furthermore, the relative attractions of cells to these implants may be largely d…
A new method is described for effecting selective monofunctionalization of CH2CH)8Si8O12 2: reaction of 2 with triflic acid (TfOH) produces (TfOCH2CH2)(CH2 CH)7Si8O12 3, which reacts with nucleophiles (e.g. H2O or 2-mercaptopyridine) to produce (XCH2CH2)(CH2CH)7Si8O12 (4 X = OH, 5 X = SC5H4N); acylation of 4 with p-O2…
Detailed interpretation of EPR signals appearing in commercial MoO3 upon reduction invacuo at different temperatures is presented. New O- species in the MoO3 bulk and Mo5+ ions without a molybdenyl bond have been found under such conditions, their intensities depending on temperature and time of reduction. It is argue…
The new mixed Mo/V heteropoly compound [Ni(C2N2-H8)3]2Na[MoV2MoVI6VIV8O40(PO4)]·H2O with a tetra-capping Keggin structure has been synthesized hydrothermally and its structure determined by X-ray diffraction