Materials Literature
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In this paper we study how the steady state morphology during shear of an incompatible blend can be affected by the initial conditions. By means of rheological experiments it is shown that below a critical shear rate multiple steady states can be obtained, the final morphology being then determined by the initial cond…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEPR Spectra from "EPR-Silent" Species: High-Field EPR Spectroscopy of Manganese(III) PorphyrinsDavid P. Goldberg, Joshua Telser, J. Krzystek, Antonio Garrido Montalban, Louis-Claude Brunel, Anthony G. M. Barrett, and Brian M. HoffmanView Author Information Department o…
Ultrasound can be used to oxidize aqueous pollutants; however, due to economic reasons, higher oxidation/destruction rates are needed. This study reports enhancements of reaction rates by the addition of sodium chloride salt. Using 20 kHz ultrasound, large salt-induced enhancements are observed 6-fold for chlorobenzen…
Calcined dolomites (CaO−MgO) from four different quarries have been tested for the upgrading of the hot raw gas from a fluidized bed gasifier of biomass with air. These calcined dolomites have big macropores (900−4000 Å) and low (3.8−12 m 2 /g) BET surface areas. They have been tested in a fixed bed of 6 cm i.d. downs…
A tetranuclear ferric Keggin sandwich-type heteropolyanion has been synthesized by the reaction of the lacunary species Delta-Na(8)H[PW(9)O(34)] with FeCl(2) followed by O(2) oxidation in nonaqueous media. The structure of [(n-C(4)H(9))(4)N](6)[Fe(III)(4)(H(2)O)(2)(PW(9)O(34))(2)].4CH(3)CN.2CH(2)Cl(2).2H(2)O (TBA-1) w…
Abstract Silica in combination with organosilanes ( e.g. [bis(3-triethoxysilylpropyl)tetrasulfane] = TESPT) has recently become more important in tire applications. Their use in tire treads leads to an improvement in rolling resistance and wet traction. The requirements for the attainment of these properties are, that…
A mechanism that is simpler than the recently advanced is followed for the (salen)Mn-catalyzed asymmetric epoxidation of olefins. Oxametallacycles such as B or B′ are not viable intermediates; radical species such as A, which are directly formed by attack of the olefin on the oxomanganese catalyst are more likely cand…
The effect of elemental substitutions on the properties of the ferromagnetic, conducting, highly magnetoresistive compound ${\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ has been studied. The results of Co doping and Ni doping on the Mn site and Gd doping on the La site are reported. These compounds were i…
We report electrical transport experiments on the colossal magnetoresistance compound $({\mathrm{L}\mathrm{a},\mathrm{C}\mathrm{a})\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ over a wide range of composition and temperature. Comparison of thermopower and electrical resistivity measurements above the metal-insulator transitio…
A short overview is given on deposition and integration of PZT thin films on silicon for MEMS applications. The application principles are explained and the piezoelectric coefficients are compared with the ones of AlN and ZnO. The Materials figure of merits are given for various applications and discussed. The couplin…
The formation mechanism of the core-shell structure of a BaTiO 3 (BT)–MgO–Ho 2 O 3 -based system was studied. Mg reacted with BT at low temperatures and showed poor diffusivity compared with Ho. The core-shell structure was considered to be formed by the suppression of the diffusion of Ho into the core region by Mg. A…
The mode coupling theory (MCT) for the ideal liquid glass transition, which was worked out for simple liquids mainly by G\"otze, Sj\"ogren, and their co-workers, is extended to a molecular liquid of linear and rigid molecules. By use of the projection formalism of Zwanzig and Mori an equation of motion is derived for…
The damage caused to amphiphilic n -alkane monolayers under XPS measurement conditions was assessed in a combined XPS-FTIR study supplemented by additional AFM imaging and contact angle measurements. Nine different self-assembled monolayer/substrate systems were examined, comprising a long chain silane (C 18, OTS), a…
Various geometry optimization techniques are systematically investigated. The rational function (RF) and direct inversion in the iterative subspace (DIIS) methods are compared and optimized for the purpose of geometry optimization. Various step restriction and line search procedures are tested. The model Hessian recen…
Large piezoelectric single crystals of the Pb[(Zn 1/3 Nb 2/3 ) 0.91 Ti 0.09 ]O 3 (PZN-PT) binary system have been successfully obtained using a conventional flux method and a suitable ratio of PZN-PT: PbO flux. The largest crystal had dimensions of 43×42×40 mm and weighed 415 g. In order to improve growth behavior and…
Abstract Electrospray mass spectrometry (ESI‐MS) is used to analyze in detail the structure of the first five generations of the poly(propylene imine) dendrimers with 4–64 end groups. Although the reaction sequence to prepare these dendrimers is highly optimized, an accumulation of statistical defects is observed at h…
The structural determination of a dinuclear Gd(III)−Ni(II) entity confirms the strict dinuclearity of the complex while the magnetic properties evidence the presence of a ferromagnetic interaction between the paramagnetic (S = 1) nickel ion and the gadolinium center (S = 7/2), with a J value of 3.6 cm-1.
Symmetrically substituted octahydroxy porphyrins, tetrakis(3‘,5‘-dihydroxyphenyl)porphyrin, H 2 T(3‘,5‘-DHP)P, tetrakis(2‘,6‘-dihydroxyphenyl)porphyrin, H 2 T(2‘,6‘-DHP)P, and their Zn(II) and Mn(III) derivatives have been developed as building blocks for supramolecular hydrogen-bonded networks. The crystal structures…
A family of silica molecular sieves with lamellar frameworks and hierarchical structure (denoted MSU-V) was assembled from homogeneous solutions of neutral H 2 N(CH 2 ) n NH 2 bolaamphiphiles ( n = 12−22) as the structure directors and tetraethylorthosilicate as the inorganic precursor. Optimal lamellar order was obse…
The mechanical and structural properties of the tetrahedral amorphous carbon (ta-C) films deposited by the filtered cathodic vacuum arc technique on silicon at room temperature have been studied over the carbon ion energy range 15–200 eV. High (about 80% or higher) sp3 bond fractions were obtained for almost all ion e…