Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A totally non-ionic pathway to mesoporous Ti-MSU-silicas is reported, wherein the incorporation of Ti into the silica framework proceeds via the hydrolysis of a chemically modified Ti-alkoxide species which permits control over the rate of hydrolysis of the metal precursor, thus allowing stoichiometric titanium incorp…
Zircaloy-4 cladding materials have been oxidized in a lithiated environment in autoclave and in out-of-pile loop tests. In such oxidation tests, a strong enhancement of the oxidation rate can occur depending on the water chemistry conditions and on the oxidation time. In this work, in order to improve our understandin…
Sulfated titania−silica gels have been obtained from tetraethoxysilane and titanium isopropoxide gelled either in acid medium (pH 3, HCl) or basic medium (pH 9, NH 4 OH). These gels were sulfated using sulfuric acid or ammonium sulfate. Three different methods have been used to study the acidity of these solids: forma…
Hysteresis measurements obtained on 0/90 SiC/CAS and SiC/SiC have been used to analyze the interface responses. Four parameters have been derived from these measurements. These relate to the compliance change caused by matrix cracking, the frictional resistance of the interface, the interface debond resistance, and th…
Lead sulfide thin films were grown at room temperature by the successive ionic layer adsorption and reaction (SILAR) technique on soda lime glass, ITO and Al2O3 covered glass, SiO2, (100)Si and (111)Si substrates. SILAR utilises sequential treatment of the substrate with aqueous precursor solutions. Dilute solutions o…
Abstract A novel methodology is proposed in this study to evaluate biofilm adhesion strength in two different ways: by measuring detached biomass caused by tensile force and by shear force. Tensile force was provided by centrifuging biofilm-attached plates installed on rotary tables. Shear force was provided by collid…
X-ray absorption spectroscopy at the L 2,3 edges of 3d transition metals has been used to study the electronic structure of molecular-based magnets with Curie temperatures ranging from 66 to 315 K. These magnets are bimetallic cyanides of the Prussian blue family, constructed by a three-dimensional assembling of −NC−C…
Three types of urethane−acrylate IPN's, two sequential and one simultaneous, were prepared in which the urethane was formed under thermal polymerization; and the acrylate, by photopolymerization. The IPN morphologies were studied by transmission electron microscopy (TEM) and dynamic mechanical analysis (DMA). When the…
The dinuclear Mn III complex [Mn 2 O(PhCOO) 2 (bpy) 2 (OH)(NO 3 )]·H 2 O was prepared by controlled oxidation of manganous nitrate with n -tetrabutylammonium permanganate in the presence of benzoic acid (PhCOOH) and 2,2‘-bipyridine (bpy). Its structure was determined in a single-crystal X-ray diffraction experiment, a…
Description This collection of work represents the tremendous progress that has recently been made toward the characterization and modeling of Titanium Matrix Composites (TMCs), including microstructural aspects, stress analysis, and life models. 29 papers divided into five sections cover: • Interfacial Properties and…
The synthesis of a new monoheteroporphyrin, 5,20-diphenyl-10,15-bis( p -tolyl)-21-selenaporphyrin (SeDPDTPH), is reported. The 21-selenaporphyrin has been characterized by 1 H NMR, 13 C NMR, mass spectrometry, and UV−visible spectra and an X-ray structural analysis. The free base selenaporphyrin SeDPDTPH crystallizes…
Charge transfer and recombination at the single crystalline ZnO photoanode were studied by a combination of dc and ac techniques. The potential dependence of the spectrally resolved photoluminescence gives information on the competition between bulk recombination and electron−hole pair separation. The kinetics of surf…
New methodology was developed for synthesis of regiochemically pure porphyrins with D 2 h symmetry (e.g. 9 ) via tetramerization reactions involving two different pyrroles. The two pyrrole components were a 2,5-diunsubstituted pyrrole (e.g. 11 ) and a 2,5-bis[( N,N- dimethylamino)methyl]pyrrole (e.g. 10 ), the latter…
(meso-Tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphinato)manganese(III) tetracyanoethenide, [MnTP'P][TCNE], has been structurally and magnetically characterized. [MnTP'P][TCNE] (C(96)H(108)MnN(8)O(4)) belongs to the triclinicP&onemacr; (No. 2) space group with a = 8.597(2) Å, b = 14.756(4) Å, c = 17.573(5) Å, alpha…
Nine polyesters were synthesized by polycondensation of silylated hydroquinone with substituted terephthaloyl chlorides. Three mono(alkylthio), three bis(alkylthio), and three tetra(alkylthio)terephthaloyl chlorides were used as reaction partners. The length of the alkyl side chains was varied among 8, 12, and 16 carb…
Cellular films may be produced through evaporation of aqueous dispersions containing polymeric particles. The membranes of the cells are made of hydrophilic polymers which cover the particle surfaces; they form a periodic structure which separates the hydrophobic particle cores. These films are used to make adhesive c…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTOn Spherulitic Growth in a Monodisperse ParaffinD. C. Bassett, R. H. Olley, S. J. Sutton, and A. S. VaughanView Author Information J. J. Thomson Physical Laboratory, University of Reading, Reading RG6 6AF, U.K.Cite this: Macromolecu…
Dry-roasted peanuts were coated with whey protein isolate (WPI)/glycerol solutions. Accelerated rancidity tests of uncoated and coated nuts were performed. Coating thickness and environmental relative humidity were studied as factors that affected rancidity. In addition, the effect of limiting the amount of WPI soluti…
Mixed-valence states of μ-oxo-centered trinuclear iron carboxylate complexes, [Fe 3 O(CH 2 BrCO 2 ) 6 (H 2 O) 3 ] ( 1 ), [Fe 3 O(CH 3 CO 2 ) 6 (H 2 O) 3 ]·2H 2 O ( 2 ), and [Fe 3 O(CH 2 ClCO 2 ) 6 (H 2 O) 3 ]·3H 2 O ( 3 ), were characterized by X-ray crystallography and 57 Fe-Mössbauer spectroscopy. Compound 1 has a t…
(2-Nitro-5,10,15,20-tetraphenylporphyrinato)nickel(II) reacts with α-isocyanoacetic esters in the presence of DBU to give the first β-fused pyrroloporphyrins, the pyrrole ring in the fused system being shown to undergo typical pyrrole-type chemistry; the corresponding zinc(II) complex affords a novel cyclopropanochlor…