Materials Literature
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The crystallographic and magnetic structures of Fe 0.5 Cu 0.5 Cr 2 S 4 have been examined in order to generate a possible mechanism to explain the CMR behaviour of such spinels. Neutron powder diffraction has revealed that the tetrahedrally coordinated Fe 3+ and Cu + ions are fully ordered, with the magnetic moments o…
A novel fluctuation method for the synthesis of Ti3SiC2 powders was developed. The raw materials used in this process are Ti, Si, and graphite powders. Fluctuation synthesis utilized Si as in-situ liquid forming phase (additive), which was formed by heating the powder mixtures to 1300°C and using the heat released fro…
Micrometer sized crystals of close packed Au55(PPh3)12Cl6 clusters are formed from dichloromethane solution and are investigated by transmission electron microscopy and small angle X-ray diffraction.
A nitrogen-rich sialon phase containing Sr or Eu, named the S-phase, has been reported to form in the M′-Si-Al-O-N systems with M′=Sr and Eu. A sample with overall composition Sr 2 Al 2.5 Si 10 O 4 N 14.5 hot-pressed at 1800 °C for 2 h contained approximately 85 vol% of the S-phase, and in addition the α- and β-sialon…
A random ferroelectric tilted smectic phase has been observed and investigated for the first time. In this phase, the molecular director in smectic layers is tilted with respect to the smectic layer normal but the tilt directions in different smectic layers are randomly oriented. This structure is confirmed by electro…
Abstract The solubility of CO 2 in PETG, a glycol‐modified PET, was measured at different temperatures and over a broad pressure range, and diffusion coefficients were derived at the corresponding conditions. The solubility of CO 2 is quits high. For example, almost 15 wt% CO 2 can be dissolved in PETG at 35°C and 6.0…
The conventional model for multiwinding transformers is difficult to relate to its physical construction, and the measurement of the model parameters is difficult and unreliable. In this paper a physically-based electrical model of a high voltage multi-winding transformer is presented. Each component in the electrical…
Abstract The aim of this paper is to identify the controls on the rates of illitization in Texas Gulf Coast shales under diagenetic conditions. Two different mineral transformations are considered: the transformation of smectite to (nearly) illite and the precipitation of discrete illite, i.e., the formation of pure i…
Principles of protein thermostability have been studied by comparing structures of thermostable proteins with mesophilic counterparts that have a high degree of sequence identity. Two tetrameric NADP(H)-dependent alcohol dehydrogenases, one from Clostridium beijerinckii (CBADH) and the other from Thermoanaerobacter br…
Energy and electron transfer processes taking place in [3]-rotaxanes containing various photo- and electro-active metal-complex fragments, such as zinc(II)- and gold(III)-porphyrin stoppers, copper(I)- and silver(I)-bis-phenanthroline complex moieties, were studied by spectroscopic steady state and time resolved techn…
We examine the phenomenon of dynamical heterogeneity in computer simulations of an equilibrium, glass-forming liquid. We describe several approaches for quantifying the spatial correlation of single-particle motion, and show that spatial correlations of particle displacements become increasingly long range as the temp…
This paper presents the results of studies of the dielectric relaxation of nematic 6CHBT obtained for different values of the angle between the directions of the macroscopic orientation of the sample (director n) and the probing electric field E. Analysis of the evolution of the relaxation spectrum from ε*‖(ω) (E‖n) t…
Nickel‐positive electrodes obtained by electrochemical impregnation of aluminum‐substituted hydroxide are found to deliver a reversible discharge capacity of . This is much higher than the capacity of hydroxide electrodes [ : this work; : Dixit et al., J. Power Sources, 63 , 167 (1996)] prepared under identical condit…
Manganese-promoted active carbons have been studied as catalysts for selective catalytic reduction with ammonia. Activity, selectivity and stability depend on the preparation procedure, the choice of the precursors and the chemistry of the starting support. The highest activity in the low-temperature region was shown…
The transition from the lamellar (lam) to the gyroid (gyr) phase in the melt of a poly(oxyethylene)–poly(oxybutylene) (EB) diblock copolymer was shown to proceed via an intermediate perforated lamellar (pl) structure. The transition was studied starting from a shear-oriented lamellar phase using synchrotron small-angl…
Three polyurethane (PU) vascular grafts with novel designs were investigated and compared in terms of the microporous structure, reinforcement technology, polymer chemistry, microphase separation, and mechanical properties. The Corvita graft, composed of a poly(carbonate urethane) polymer, displayed a helically wound…
The full Euclidean symmetry groups for all the single-wall carbon nanotubes are non-Abelian non-symorphic line groups, enlarging the groups reported in the literature. For the chiral tubes ( n 1 , n 2 ) ( n 1 > n 2 >0) the groups are L q p 22 = T r q D n , where n is the greatest common divisor of n 1 and n 2 , q = 2(…
Fly ash, used in conjunction with bis(triethoxysilylpropyl)tetrasulphane (TESPT) as coupling agent, has been investigated as a reinforcing filler for polyisoprene compounds. The TESPT adsorption isotherm on silica showed that in forming a monolayer, the molecule assumes an inverted U conformation on the surface. With…
B-doped diamond films were deposited by large-area hot filament chem. vapor deposition (HFCVD) on Si and different industrial electrode materials, such as Ti, Zr, Nb, Ta, W, and graphite, with areas up to 50 * 60 cm2. B-doping levels ranging from 50 to several thousand ppm were realized using trimethylborate. These el…
Heteroleptic yttrium bis(dimethylsilyl)amide complexes featuring chelating N,N′-bis(3,5-di-tert-butylsalicylidene)ethane-1,2-diamine (H2L1) and trans-1,2-bis(2,4,6-triisopropylbenzenesulfonamido)cyclohexane (H2L2) ligands were immobilized on mesoporous silica MCM-41 according to a heterogeneously performed silylamide…