Materials Literature
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High quality ZnO thin films have been grown on a Si(100) substrate by plasma enhanced chemical vapor deposition using a zinc organic source [Zn(C2H5)2] and carbon dioxide (CO2) gas mixtures at the low temperature of 180 °C. The dependence of ZnO thin film quality on the gas flow rate ratio of Zn(C2H5)2 to CO2 (GFRRZC)…
Titanium containing ethane bridged hybrid mesoporous materials with uniform hexagonal arrangement are prepared by two different routes and characterized using several analytical techniques. The effect of substitution of bridged silsesquioxane precursors for siloxane precursors on the properties of resultant mesoporous…
Propionate CoA-transferase from Clostridium propionicum has been purified and the gene encoding the enzyme has been cloned and sequenced. The enzyme was rapidly and irreversibly inactivated by sodium borohydride or hydroxylamine in the presence of propionyl-CoA. The reduction of the thiol ester between a catalytic sit…
The syntheses, crystal structures and variable temperature (5–300 K) magnetic susceptibility measurements of two salen complexes of manganese(III) [where H2salen = N,N′-bis(salicylidene)-1,2-diaminoethane] having azido and dicyano argentate(I) as bridging ligands are reported. Both complexes belong to one-dimensional…
Vinyl benzene sulfonate (styrene sulfonate — VBS) and polystyrene sulfonate (PSS) are incorporated into layered double hydroxides (LDH) of nominal composition ZnnAl(OH)2(1+n)Cl·nH2O by exchange and templating reaction, respectively. PSS adsorption leads to a delamination process of the LDH 2D-host structure. A hydroth…
Cathodic electrodeposition is a promising route for electrochromic thin-film deposition. A new, simple, and fast method for preparing the deposition solution is described. Typically the solution consists in an equimolar mixture of 25 mM and acidified at pH 1.2 by perchloric acid addition. A film deposited at −0.24 V v…
A first-principles-derived approach is used to study structural, piezoelectric and dielectric properties of Pb(Zr 1 m x Ti x )O 3 (PZT) solid solutions near the morphotropic phase boundary at low temperature. Three ferroelectric phases are found to exist: a tetragonal phase for larger x compositions, a rhombohedral ph…
Different crystal forms of the analgesic drug ibuprofen were prepared and characterized in this study. Various conditions were used for the crystallization: crystallization was carried out using the solvent change method, the temperature change method, and the solvent evaporation method. Crystals were grown from diffe…
An improved synthesis of dithieno[3,2-b:2',3'-d]thiophene (DTT) and its 2,6- and 3,5-dibromo derivatives has been devised; Stille cross coupling of 2,5-(bistrimethylstannyl)-DTT afforded the oligomer 12.
The gadolinium-based manganite GdMnO3, partially substituted by calcium at the cationic site, has been investigated through its crystallochemical and magnetic properties. The Gd1−xCaxMnO3 solid solution crystallises in an orthorhombic perovskite-type structure (S.G. Pbnm) in the range 0 ≤ x ≤ 0.45. With increasing x,…
The chemical interactions between several aluminosilicate glasses and components at the anode side of SOFC have been investigated. Severe reactions occur if the modifier ions are Ba and Ca. MgO base sealants have been investigated in detail. The formation of some detrimental phases are seen. Cordierite forms with many…
Extralow sulfur, cold-rolled 304 stainless steel (SS) samples, annealed and cold-worked to different degrees in an industrial plant, together with a ferrite-rich SS, have been studied by electrochemical and microscopic techniques to analyze the effect of cold-working on its passive behavior in sulfate media. The techn…
The suitability of protein-coupled liposomes as drug carriers for brain specific targeting was investigated using albumin (BSA) and cationized albumin (CBSA), respectively, as model proteins. Liposomes coated with polyethylene glycol (sterically stabilized, PEG-liposomes) were prepared from phosphatidylcholine, choles…
Nanocrystalline NiO thin-film electrodes were prepared by reactive pulsed laser ablation of a metallic Ni target in an oxygen ambient. X-ray diffraction (XRD) and scanning electron microscopy measurements demonstrated that the films deposited on stainless steel substrate exhibited nanocrystalline structure with averag…
Many methods for the determination of the order parameter in nematic liquid crystals are known. However, most of them are not applicable to cholesteric and smectic phases. Therefore, experimental data on the order parameter in cholesteric and smectic phases are hardly available. To determine the orientational order pa…
The virulence of a urease-negative mutant of uropathogenic Proteus mirabilis and its wild-type parent strain was assessed by using a CBA mouse model of catheterized urinary tract infection. Overall, catheterized mice were significantly more susceptible than uncatheterized mice to infection by wild-type P. mirabilis. A…
An electromagnetic study of the staircase approximation of arbitrary shaped gratings is conducted with three different grating theories. Numerical results on a deep aluminum sinusoidal grating show that the staircase approximation introduces sharp maxima in the local field map close to the edges of the profile. These…
Using pure Ti powder with particle sizes from 300 to 500 \\micron prepared by the plasma rotating electrode process (PREP), porous pure Ti compacts for biomedical applications were synthesized by powder sintering, and microstructures and mechanical properties of the compacts were investigated in this study. Porous com…
Luminescent Y3Al5O12∶Ce3+ (YAG∶Ce3+) ceramics with nanometer- to micronmeter-sized particles were prepared by a new sol–gel pyrolysis method. Notwithstanding thermochemical considerations, the combined fuel system of urea and poly(vinyl alcohol) (PVA) yielded nanoparticles exhibiting single-crystal features. This can…
In recent years, various methods have been developed for the synthesis of single phase ferrite nanomaterials. Most approaches involve the use of high temperatures, or the preparation of powders. Ceramic/metal nanocomposites and composite thin films have attracted much attention because of their unique mechanical, elec…