Materials Literature
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We investigated the precipitation of carbonates by Deleya halophila in liquid culture media containing different concentrations of marine salt: 2.5%, 7.5%, 12.5%, and 20% (wt/vol). The microorganism was isolated from soils classified as haplic Solonchaks located in arid southeastern Spain. The mineral phases that were…
An infrared radiation(IR) heating method was used to evaluate thermal shock parameters(thermal shock strength and thermal shock fracture toughness)of float glass and alumina. This technique makes it possible to evaluate the parameters directly from the electric power of the IR heater. In this paper we discuss how the…
We have prepared simple photovoltaic devices based on composite materials formed by mixing cadmium selenide or cadmium sulfide nanocrystals with the conjugated polymer poly(2-methoxy, 5-(2′-ethyl)-hexyloxy-p-phenylenevinylene) (MEH-PPV). When the surface of the nanocrystals is treated so as to remove the surface ligan…
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A range of mesoporous vanadosilicate molecular sieves with the MCM-41 structure and the atomic ratio Si/V=10–160 have been synthesized using vanadyl sulfate as the source of vanadium. The products were characterized by XRD and 51 V and 29 Si MAS NMR spectroscopy. The increase of the unit-cell parameter (monitored by X…
The new complexes [(µ4,η4-TCNX){Os(PR3)2(CO)(H)Cl}4], R = isopropyl, TCNX = tetracyanoquinodimethane [TCNQ, 2,2′-(cyclohexa-2,5-diene-1,4-diylidene)bis(propane-1,3-dinitrile)] or 1,2,4,5-tetracyanobenzene (TCNB), were studied by spectroelectrochemistry in the UV/VIS/NIR and IR regions and by EPR spectroscopy. Both com…
Abstract Dichloro‐2‐(N,N‐dimethylaminomethyl)‐phenylgold(III), [Au(damp‐C,N)Cl 2 ], hergestellt durch Umsetzung von [Hg(damp)Cl] mit Na[AuCl 4 ], kristallisiert monoklin, Raumgruppe P2 1 /c mit a = 7,896(3); b = 9,487(2); c = 15,107(6) Å; β = 100,22(3)°, Z = 4. Die Kristallstruktur besteht aus monomeren [Au(damp‐CN)Cl…
The adhesion capability of novel functional polystyrenes to metals and their capability to provide corrosion resistance to metals under various conditions have been investigated. The polyfunctional polystyrenes were prepared via reaction of the polystyrene with different functional groups [2-methyl-2,3-epoxy-6-octene-…
A homogeneous and stoichiometric Pb(Zr,Ti)O 3 (PZT) fine powder was prepared by thermal decomposition of the metal oxalate precursor formed by the precipitation reaction of the metallic components in aqueous solution with oxalic acid. Theoretical solubility isotherms of metal oxalates were established as a function of…
Three new compounds, AgLnW 2 O 8 (Ln 3+ =Eu, Gd or Tb), have been prepared by a solid-state reaction and crystallize with a scheelite-related monoclinic symmetry. Their IR spectra show absorption transitions in the region 1000–400 cm -1 similar to KLnW 2 O 8 . Broad excitation and emission bands of the tungstate group…
The molecular sieve SAPO-35 has been synthesized in a non-aqueous medium for the first time using a new template, hexamethyleneimine. It has been characterized by XRD, SEM, TG–DTA, MAS NMR, FTIR and adsorption techniques. The study indicates that Si replaces mainly the P atoms in the AlPO 4 -35 framework giving rise t…
The first hyperpolarizability β and electronic properties of N,N-dimethylamine and/or nitro-substituted benzylideneanilines and biphenyls are compared with those of conformationally locked model compounds, viz. identically substituted 2-phenyl-3,3-dimethyl-3H-indoles and fluorenes, respectively. Although PM3 semi-empi…
The influence of some selected factors on the properties of nano- and microparticles obtained from vicilin (storage protein from Pisum sativum L.) has been studied. These systems were prepared by coacervation followed by a cross-linking step with glutaraldehyde. Stabilized vicilin particles could be formed very rapidl…
We report a piezoelectric effect in cholesteric liquid crystalline elastomer gels. When we apply a shear stress to a cholesteric elastomer gel in the direction perpendicular to its helical axis, a polarization can be induced in the direction perpendicular to both the stress and the helix. This experimental observation…
NiZn ferrite thin films with spinel structure have been deposited successfully on glass substrates at a relatively low temperature by means of the Facing Target Sputtering (FTS) technique. In addition to substrate temperature, PO/sub 2//P (O/sub 2/ partial pressure over total sputtering pressure) ratio was found to be…
A method to calculate the low frequency complex electric field in polluted insulators is proposed. The method is based on a quasi-static approximation which permits the decoupling of Maxwell's equations. The method is implemented numerically through the finite element technique by defining a complex functional.
The third order nonlinear optical susceptibilities χ(3) of BaO-TiO2-B2O3 glasses have been measured by the third harmonic generation (THG) method. Raman spectroscopic investigation revealed that Ti4+ ions mainly exist as 4-coordinated. It was found that the addition of TiO2 to BaO-B2O3 glass increases the χ(3) as well…
Ferromagnetic glass-ceramics can be expected to be useful as thermoseeds for hyperthermia of cancer, especially cancer located at deep parts of body, since hysteresis loss heating locally occurs at the cancer when they are subjected to an alternating magnetic field. Glass-ceramics containing a large amount of α-Fe fin…
Gunshot testing of power transmission ceramic and nonceramic insulators was performed and the results were compared to the in service experience of a large electric utility. Significant differences in the response of ceramic and nonceramic insulators to being gunshot were found. These differences were reductions in el…
Zirconium is prone to localized corrosion in acidic chloride (Cl–) solutions contaminated by oxidizing ions, such as ferric or cupric ions. This tendency can be reduced by ensuring that the zirconium surface is clean and smooth. The effect of surface condition on localized corrosion of zirconium in acidic chloride sol…