Materials Literature
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The states of Ti in titania–silica mixed oxides have been studied by varying the Ti content. EXAFS analyses indicated that the amount of tetrahedral Ti species increased with a decrease in the Ti content reaching a maximum at 10 to 20 mol% of Ti while octahedrally coordinated Ti predominated in the high Ti content reg…
A new silicon clathrate compound containing Ba was prepared by the thermal degradation of a solid solution (Na2Ba)Si4 at 500°C in vacuum. The compound has the Na8Si46 clathrate type structure, which consists of silicon tetrahedral networks having two types of cages, pentagonal dodecahedra and 14-face polyhedra. The Ba…
The title compound presents the first example of a sterically ruffled porphyrin bearing only meso substituents; the degree of ruffling is severe, with Cm-displacements of up to 1 Å.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Organoimido Derivative of the Hexatungstate Cluster: Preparation and Structure of [W6O18(NAr)]2- (Ar = 2,6-(i-Pr)2C6H3)Thomas R. Mohs, Glenn P. A. Yap, Arnold L. Rheingold, and Eric A. MaattaCite this: Inorg. Chem. 1995, 34, 1, 9–10Publication Date (Print):January 1, 1995…
The stability of a plasma-treated polymer surface is an important issue, but very often a surface rendered wettable by the treatment is found to revert to a less wettable state with time. The purpose of this work was to minimize the ageing phenomenon by stabilizing the surface layer via crosslinking using an inert gas…
In the framework of the three-dimensional bond-fluctuation model, the formation and swelling of end-linked monodisperse polymer networks is simulated. The kinetics of cross-linking show a cross-over from reaction controlled to diffusion-limited behaviour, depending on the reaction rate.On small scales the internal dim…
Many different types of animals use appendages bearing rows of hairs to capture food or molecules from the surrounding fluid, to locomote or to move fluids past themselves. The performance of these appendages, whose hairs operate at Reynolds numbers (Re) of 10(-5) to 10, depends on how much of the fluid that they enco…
Abstract During the last few years, improvements in control strategies became a necessity, with controls being targeted on material properties. The ever‐increasing demand for polymer blends spells the need for in‐line instrumentation capable of monitoring blend properties such as morphology. Since ultrasonics have pro…
The interaction of chromium oxide with different titania–silica supports has been examined. The oxide supports investigated consisted of SiO2, TiO2, physical mixtures of TiO2 and SiO2, a surface titania overlayer on SiO2(10% of theoretical monolayer) and a surface silica overlayer on TiO2(80% of theoretical monolayer)…
Gels have been prepared via hydrolysis–condensation reactions of triethoxysilane (TREOS) and methyldiethoxysilane (MDES) in various ratios. The hydrolysis–condensation reactions of the precursors have been investigated by 29Si and 17O solution NMR. Both precursors present a very high reactivity towards hydrolysis and…
A homogeneous and stoichiometric fine powder of the piezoelectric oxide Pb(Zr0.52Ti0.48)O3(PZT) has been prepared by the hydroxide coprecipitation route. By considering the thermodynamic equilibrium constants, the solubility and ionic equilibria relationships for individual metal hydroxides in aqueous media could be t…
Replacement of the classical acceptor TCNQ with (substituted) DCNQIs opens new routes to organic conducting materials. The radical anion salts [2,5-R1,R2-DCNQI]2M (R1,R2= Hal, Me, MeO; M = Li, Na, K, NH4, Cu, Ag, Tl) all belong to the same space group l41/a or related ones (C2/c or P4/n); therefore, the correlation be…
CeO2-ZrO2 powders with various ZrO2 compositions, which were prepared by co-precipitation, were subjected to an evolved-oxygen gas-analysis. The samples were heated from 373 to 1323 K in Ar+H2+H2O gas mixtures. A closed-system oxygen analyzer developed by one of the authors was used to establish a constant ratio of H2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel Catalytic Oxidation Reactions: Oxygen with H2, NH3, and N2H4 on Rh(111)M. L. Wagner and L. D. SchmidtCite this: J. Phys. Chem. 1995, 99, 2, 805–815Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995http…
Poly(4,4′-oxydiphenylene pyromellitimide) (PMDA—ODA) films of 10–109 μm thickness were prepared from its poly(amic acid) precursor by thermal imide-ring-closure formation at various temperatures. Water sorption in the films was measured at 25°C over 22–100% relative humidity using an electromicrobalance. Water diffusi…
Silver imidazolate has been synthesized and its solid-state structure determined, ab initio, from conventional X-ray powder diffraction data only. The crystals are orthorhombic, space group P212121, with a= 5.5759(4), b= 6.7452(4), c= 22.174(1)Å, U= 834.0(1)Å3, Z= 8, Dc= 2.786 g cm–3. The structure was solved by a rea…
In this paper we describe an experimental study on ferroelectric non-volatile memory. The test devices using a MFMIS (metal-ferroelectric-metal-insulator-semiconductor) structure were developed for 1-Tr-type NDRO (non-destructive readout) memory. PZT (Lead-zirconate-titanate) and PT (lead-titanate) thin films were dep…
"Aging and Life Extension of Major Light Water Reactor Components." Nuclear Technology, 109(1), pp. 163–164
In this paper, the authors report the results of laboratory experiments on NO/sub x/ removal (DeNOx) using a nonthermal plasma process. Studies were conducted on a dry-type plasma reactor and several wet-type reactors to evaluate DeNOx efficiency. The reactor geometry was coaxial with an inner discharge electrode and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNO Reduction by Activated Carbons. 3. Influence of Catalyst Loading on the Catalytic Effect of PotassiumM. Jose Illan-Gomez, Angel Linares-Solano, Ljubisa R. Radovic, and Concepcion Salinas-Martinez de LeceaCite this: Energy Fuels 1995, 9, 1, 104–111Publication Date (Print):…