Materials Literature
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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
This paper describes an approach to the design of brushless dc motors considering cogging torque reduction and running torque optimization to enhance the product robustness. The approach is based on the Taguchi method and utilizes the orthogonal array for design of ''experiments', i.e. the scheme for numerical simulat…
A new anion exchange method of intercalation in layered double hydroxides (LDHs), based on the formation and organic phase extraction of a salt between dodecylsulfate anions and a cationic surfactant (CTA), is described which is shown to be a very fast and efficient way to obtain a wide variety of LDH-intercalated org…
The interest in SF/sub 6/ gas mixtures has been re-ignited in recent years by the issue of the greenhouse effect of the SF/sub 6/ gas, and most research work is now focused on a SF/sub 6//N/sub 2/ gas mixture, which is suitable for application in electrical apparatus with slightly non-uniform fields. This paper presen…
The properties of monomeric and dimeric thiacarbocyanine (1) and three derivatives with methyl (2) and ethyl (3 and 4) meso-substituents were studied in aqueous solution by time-resolved and steady-state spectroscopic methods. Dimerization is characterized by a blue-shifted band at 512–536 nm, a high association const…
A suitable relationship between oxide ion polarizability, cation polarizability, optical basicity and O1s binding energy in XPS spectra has been searched on the basis of experimental and calculated data reported in the literature for numerous simple oxides. It has been established that O1s binding energy decreases wit…
Two titanium-oxo clusters, [Ti3O(OPri)7(O3C9H15)] 1 and [Ti11O13(OPri)18] 2, have been obtained through the reactions of Ti(OPri)4 with ketones such as acetone, acetylacetone and diacetone alcohol. Complex 1 is composed of a trinuclear unit that is capped by a tridentate enolate ligand synthesized insitu. Complex 2 is…
A two-dimensional anisotropic nonlinear evolution equation is derived to model the formation of facets and corners in the course of kinetically controlled crystal growth. The equation is solved numerically in particular cases corresponding to the faceting of [001], [111], and [110] growing crystal surfaces, and the fo…
A microsieve with a very uniform pore size of 260 nm and a pore to pore spacing of 510 nm has been fabricated using multiple exposure interference lithography and (silicon) micro-machining technology. The sieve consists of a 0.1 µm thick silicon nitride membrane perforated with sub-micron diameter pores and a macro pe…