Materials Literature
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Temperature-dependent resistivity of single-wall carbon nanotubes, C. L. Kane, E. J. Mele, R. S. Lee, J. E. Fischer, P. Petit, H. Dai, A. Thess, R. E. Smalley, A. R. M. Verschueren, S. J. Tans, C. Dekker
The use of ferroelectric ceramics and thin films in microwave devices requires that they possess frequency-stable, low-loss dielectric properties. At microwave frequencies, ferroelectric polycrystalline ceramic materials typically exhibit a large dielectric relaxation, characterized by a decrease in the relative permi…
We report ab initio calculations of the structural and quasiparticle properties of ${\mathrm{ZrO}}_{2}$, otherwise known as zirconia. The plane-wave pseudopotential method is used to compute the structural properties of the cubic, tetragonal, and monoclinic phases of zirconia. Oxygen vacancies in the cubic phase are a…
Kinetics of polymerization of l, l -lactide (LA) initiated with aluminum isopropoxide (Al(O i Pr) 3 ) trimer (A 3 ) or tetramer (A 4 ) was followed by polarimetry and by gel permeation chromatography (GPC). Results of the kinetic measurements show that A 3 and A 4 react with LA with different rates; namely, the k i(A…
The large magnetic-field-induced strains observed in martensitic phases based on Ni2MnGa and in other magnetic shape memory alloys are believed to arise from a process of twin-boundary motion rather than magnetostriction. The dependence of strain on magnetization, e(M), generally shows a large component that is linear…
Using high-resolution laser photoelectron spectrometry we have determined absolute cross sections and the electron angular distribution parameter for one-photon ionization of metastable and atoms to the resolved ion states near threshold -244 nm). For comparison with the experimental data we have carried out many-elec…
The development of cellulose acetate blend membranes using a commercial grade Mycell cellulose acetate and cellulose diacetate with suitable pore structure is discussed. These membranes were characterized in terms of resistance of the membrane, pure water flux, the molecular weight cutoff, water content, pore size, an…
Based on experiments conducted, it has been found that bacterial cellulose, like spruce cellulose, is soluble in an aqueous NaOH solution with the concentration of 8.5% at a temperature of −5°C if the polymerization degree of the cellulose does not exceed 400. When 1% of urea is added to the NaOH solution, the solubil…
Within an ab-initio HF scheme, we use both Berry-phase calculations and supercell calculations in order to compute the dynamical charges for lattice dynamics and the electronic dielectric constant for KNbO_3 and BaTiO_3. Comparison with experimental data indicates that HF provides a description of the electronic prope…
The Pd catalysts were prepared by impregnating Pd(CH 3 COO) 2 in Al 2 O 3 supports. To investigate the influence of mass transfer on the catalytic performance, the catalysts and the polystyrene- block -polybutadiene- block -polystyrene thermoplastic elastomers (SBS rubber) were prepared with average pore size ranging…
Calculations on [Ag(NHCHNH)] 2 and [Ag(dmtp)(NO 3 )] 2 complexes have been performed at RHF, DFT (B3LYP), and MP2 levels. Geometry optimizations have been performed on both compounds comparing the result obtained with the different levels of theory and basis set against the available experimental X-ray data. The exist…
The synthesis, X-ray crystal structures, and ESR and magnetic properties of the anhydrous salt Na 3 [Cr(OH) 6 Mo 6 O 18 ]·6(CH 3 ) 2 SO ( CrDMSO ) containing the Anderson−Evans polyanion, of two new molecular compounds based on this polyanion ([Fe(C 5 Me 5 ) 2 ] 3 [Cr(OH) 6 Mo 6 O 18 ]·20H 2 O [ FeCr(1) ], Na[Fe(C 5 H…
Experiments and ab initio calculations have been performed to study the catalytic activity of calcium oxide and magnesium oxide toward N 2 O decomposition. The experiments were carried out in a fixed-bed quartz reactor in the temperature range 773−1223 K. The decomposition of N 2 O appeared to be a first-order reactio…
The reduction of NO by black liquor char and activated carbon was studied at atmospheric pressure in a fixed bed reactor at temperatures between 450 and 650 °C. Black liquor char has a high Na to fixed C ratio (2.7), and the Na is well dispersed within the carbon matrix. The reduction of NO by both materials was confi…
The 3,6-dideoxyhexoses can be found in the cell wall lipopolysaccharide of Gram-negative bacteria, where they have been shown to be the dominant antigenic determinants. All naturally occurring 3,6-dideoxyhexoses, with colitose as the only exception, are biosynthesized via a complex pathway that begins with CDP-d-gluco…
2,2‘-Bis(trifluoromethyl)-4,4‘,5,5‘-biphenyltetracarboxylic dianhydride (6FBPDA) was synthesized from 1-iodo-4,5-dimethyl-2-nitrobenzene via a six-step synthetic route. The dianhydride was polymerized with eight different substituted 4,4‘-diaminobiphenyls in refluxing m -cresol containing isoquinoline to afford a seri…
The reaction of aqueous solutions of Na 4 Ge 4 S 10 with various surfactant alkyltrimethylammonium bromide salts yielded new surfactant−inorganic phases containing the adamantane thiogermanate anion [Ge 4 S 10 ] 4 - . The resulting [C n H 2 n +1 N(CH 3 ) 3 ] 4 Ge 4 S 10 phases with n = 12, 14, 16, and 18 crystallize i…
Chiral oxovanadium(IV), copper(II), and palladium(II) β-diketonates show a room-temperature columnar mesophase which undergoes ferroelectric switching. All the compounds were obtained as liquid crystals at room temperature, and crystallization or melting processes were not detected by differential scanning calorimetry…
To overcome the explosions that can occur during the partial oxidation of methane, the latter exothermic reaction is coupled with an endothermic one, namely, the CO 2 reforming of CH 4 . These combined reactions have been carried out over NiO/MgO solid solution, NiO/Al 2 O 3, and NiO/SiO 2 catalysts. About 90% convers…
A quaternary combinatorial masking strategy was used in conjunction with photolithography to generate compositionally diverse thin-film phosphor libraries containing 1024 different compositions on substrates 2.5 centimeters square. A parallel imaging system and scanning spectrophotometer were used to identify and char…