Materials Literature
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Results are presented of studies on the low frequency (f' 250 kHz) non-linear dielectric effect on approaching the nematic and smectic A phases in 4′-cyano-4-n-alkylbiphenyls (nCB, for n = 6, 7, 8, 10, 11, 12). In all cases, the mean-field behaviour was valid up to the clearing temperature. In the case of the isotropi…
Crystal data: Na 4 Si 3 Al 3 O 12 Cl, cubic, space group P 43 n , Z = 2, F (000) = 233.06 fm, μ n = 0.06 cm −1 , lattice parameter a o (Å) [ T ] (K) at eight temperatures: 8.882 (1) [295]; 8.902 (2) [500]; 8.912 (1) [600]; 8.923 (1) [700] 8.951 (2) [800]; 8.971(1) [900]; 8.988 (1) [1000]; 9.037 (1) [1200]. The crystal…
Using the exact charge density of intrinsic point defects of metal oxides (MOs), the phenomenological electron theory of chemisorption, developed by Volkenstein, is applied to acceptorlike and donorlike chemisorption on MO thin films for the whole ξ region (where ξ=D/LD, D is the film thickness, and LD is Debye length…
The double-differential cross section for inner-shell ionization in a crystal by fast electrons is calculated within the theory of dynamical electron diffraction. Bloch waves are used for the incident and the emerging electrons. We show that interference terms are still present in the independent Bloch-wave model. In…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
The effective response of random media consisting of two different kinds of strongly nonlinear materials with strong power-law nonlinearity is studied. Each component satisfies current density and electric-field relation of the form J=\ensuremath{\chi}|E${\mathrm{|}}^{\mathrm{\ensuremath{\beta}}}$E. A simple self-cons…
The mathematical model of a flexible beam covered with shape memory alloy (SMA) layers is presented. The SMA layers are used as actuators, which are capable of changing their elastic modulus and recovery stress, thus changing the natural frequency of, and adjusting the excitation to, the vibrating beam. The frequency…
Cardo polysulfonates (PSBCB and PSBCT) of 1,1′-bis(4-hydroxy phenyl)cyclohexane with benzene-1,3 and toluene-2,4-disulfonyl chlorides have been synthesized by interfacial polycondensation of 1,1′-bis(4-hydroxy phenyl)cyclohexane (0.005 mol) with benzene-1,3/toluene-2,4-disulfonyl chlorides (0.005 mol) using water-chlo…
4-Iodophenylboronic acid has been synthesized and shown to be a potent enhancer of the chemiluminescent horseradish peroxidase (Type VI-A)-catalyzed oxidation of luminol and isoluminol. The enhancer was effective (>100-fold enhancement) in the concentration range 10-1500 microM. Light emission in the presence of the e…
The structure of the superionic glass system (${\mathrm{Ag}}_{2}$S${)}_{\mathit{x}}$(${\mathrm{GeS}}_{2}$${)}_{1\mathrm{\ensuremath{-}}\mathit{x}}$, for three compositions x=0.3, 0.4, 0.5, has been studied using neutron diffraction, and isotopic-substitution neutron-diffraction experiments have been performed on three…
A study on the semi-volatile aromatic hydrocarbon emissions from the pyrolysis/combustion of poly(styrene) (PS), poly(ethylene) (PE) and PVC particles was conducted. Dispersions (aerosols) or batches (fixed beds) of the above types of polymer particles, 90-300 μm in diameter, were burned in bench-scale, drop-tube or m…
Polyolefins are a very important class of commercial polymers in the world today and are used in a wide range of applications. Despite their versatility, they suffer from certain drawbacks that exert a limiting influence on their range of applications. They are nonpolar and therefore exhibit poor hygroscopicity, print…
We report measurements on the isothermal relaxation dynamics of the electro-optic coefficient of electric field poled polymeric films. The studied copolymer is a side-chain Disperse Red 1/poly–methyl–metacrylate combination. The isothermal relaxation is shown to follow a Kohlrausch–Williams–Watts stretched exponential…
Abstract Product‐selectivity in the electroreduction of p ‐methylbenzaldehyde and benzoic acid under ultrasonic irradiation are examined theoretically and experimentally on the basis of mass transport phenomena in lhe electrode interface. As a result, it was suggested that the selectivity is controlled by mass transfe…
Polymer-polymer blends are the most exciting and promising area for generating novel materials with improved properties in relatively short development times [11. Among different types of blends one can distinguish two important categories. The first category involves homogeneous polymer alloys, which exhibit properti…
The reciprocal lattices of fibrous and lamellar textured polycrystalline thin films are analyzed on the basis of the number of distinct angles made between planes of {hkl} families with the texture axis. Tables of the maximum possible number of such distinct angles between any given direction/plane and all faces of a…
An investigation was carried out to determine whether isooctane and ethanol behave like sunflower oil as fatty simulants for overall and for specific migration from PVC containing aromatic plasticizers (bis-2-ethylhexyl phthalate and tris-2-ethylhexyl trimellitate). In these films, the partition coefficients of migran…
Lamellar twinning of opposite enantiomers explains why the enantiomeric composition of a supersaturated solution oscillates during resolution by preferential crystallization of the bicyclic lactam (1; see diagram on the right).
The metE gene, encoding S-adenosylmethionine synthetase (EC 2.5.1.6) from Bacillus subtilis, was cloned in two steps by normal and inverse PCR. The DNA sequence of the metE gene contains an open reading frame which encodes a 400-amino-acid sequence that is homologous to other known S-adenosylmethionine synthetases. Th…