Materials Literature
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We report on growth and low-temperature transport of Ga(Al)As-based asymmetric double two-dimensional electron gas (2DEG) structures consisting of a quantum well (QW) stacked on top of a normal heterojunction. Our data show that the electron density of both parallel 2DEGs can be reliably matched just by varying a sing…
We investigated pressure dependence of phase transition behaviour in the nematic–isotropic phase transition with molecular dynamics simulations of the Gay-Berne disc model over a range of pressures from 5.0 to 30.0 before investigating molecular and director dynamics of the system. The nematic–isotropic transition tem…
The title benzene hemisolvate, C(17)H(18)N(2)O(3)·0.5C(6)H(6), features an essentially planar (the r.m.s. deviation of the non-H atoms, excluding methyl-C, is 0.071 Å) diazo mol-ecule with an E conformation about the N=N bond, and a half-mol-ecule of benzene disposed about a centre of inversion. The dihedral angle for…
Alignment characteristics of nematic liquid crystals on micro-scale grating structures fabricated by direct laser writing employing two photon excitation has been investigated upon changing periods and heights of the grating. Liquid crystal was infiltrated in the cell made of a substrate with gratings and another glas…
The title complex, [Ni(4)(C(36)H(40)N(2)O(2))(2)(OH)(4)(C(3)H(9)OP)(2)(H(2)O)(4)]·2C(4)H(10)O·2C(3)H(9)OP·2H(2)O, is centrosymmetric with a central core that can be described as a defect double cubane. The four metal ions in the cluster are held together by four bridging hydroxide groups. Each Ni(II) atom adopts a dis…
Monte Carlo simulations and finite-size scaling analysis have been carried out to study the critical behavior in a submonolayer lattice-gas which mimics a nanoporous environment. In this model, the adsorbent is modeled as one-dimensional channels of equivalent adsorption sites arranged in a triangular cross-sectional…
Nanocomposite materials have been used on a wide scale in industrial and structural applications. The present work aims at studying the mechanical properties of high density polyethylene (HDPE) grade TR-401 hexene copolymer reinforced by montmorillonite nanoparticles (MMT), used to fabricate pipes and membranes vessel…
The monosubstituted ferrocene derivatives containing biphenyl group in mesogenic one, ω-[4-(4-methoxybiphenoxy carbonyl) phenoxycarbonyl] alkyl 4-ferrocenylbenzoate, have been synthesized by changing the carbon atoms number of the flexible spacer. The analogous compounds in which phenyl group was contained instead of…
We report density functional theory (DFT) studies of the dipole polarizabilities of nitrogen-containing octatetraene with a number of Π-electron donor substituent at the end parts. All geometries were optimized at the B3LYP/6-311++G(d,p) level of theory and polarizabilities were done at the same level of theory. The r…
A smectogenic 1,3-bis(4-decyloxyphenyl)-3H-imidazol-1-ium trifluoromethane sulfonates (1) was studied on the drift mobility of carriers by a Time-Of-Flight (TOF) technique. The transient photocurrent decay curves were clearly observed for the positive electrode illumination and the transit times could be detected to i…
Abstract The rare earth borides RERu4B4 (RE = Ce, Pr, Nd, Sm) were synthesized from the elements by arc‐melting and their crystal structures were studied on the basis of X‐ray powder and single‐crystal diffraction: LuRu4B4 type, I41/acd, a = 747.47(8), c = 1506.4(3) pm, wR2 = 0.0579, 362 F2 values for CeRu4B4, a = 751…
We have prepared a series of thermotropic liquid-crystalline oligopeptide dimers based on dendritic oligo(glutamic acid)s. The synthesized oligopeptide dimers form thermally stable columnar liquid crystals. Self-assembled structures of the columnar liquid crystals varied with the spacer length and molecular chirality…
AZ80 magnesium alloy was subjected to ECAP(equal channel angular extrusion) processing at 300℃.The evolution of microstructure,texture and mechanical properties influenced by the precipitation was investigated.The results show that ECAP processing significantly favored granular-like Mg_(17)Al_(12) continuous precipita…
The molecular dynamic behavior of silkworm cocoons produced by a single Bombyx mori strain was investigated by means of high- and low-resolution solid-state NMR experiments. Cocoons with different moisture content were prepared to study the effects of physisorbed water on their molecular dynamics in the MHz regime, wh…
The polyvinyl butyral–Al(NO3)3 composite sols and alumina fibres were synthesised by the sol–gel process in an aqueous solution using the polyvinyl butyral (PVB) and Al(NO3)3.9H2O (AN). The viscosity of PVB–AN composite sol increased with increasing AN content and aging time when it was laid at room temperature. The a…
The title compound, C(15)H(14)N(2)O(2), an azo dye, displays a trans configuration with respect to the N=N bridge. The dihedral angle between the aromatic rings is 0.18 (14)°. There is a strong intra-molecular O-H⋯O hydrogen bond. Geometrical parameters, determined using X-ray diffraction techniques, are compared with…
UV-curable liquid crystal is mesogenic monomer which can be aligned by usual method such as a rubbing technique. By UV-irradiation, it polymerizes to give a polymer in which the alignment of the liquid crystal is fixed. Applications and materials for the retarder are reviewed.
The liquid phase oxidation of toluene to benzoic acid by pure oxygen has been performed in a bubble reactor by using cobalt acetate tetrahydrate as catalyst. The influence of the oxygen partial pressures on the reaction kinetics were first investigated, and the results showed that the influence was neglectable in the…
GaN-based resonant-cavity light-emitting diodes (RCLEDs) have been fabricated on Si substrates with a current confinement by hydrogen (H) implantation. In order to ascertain the optimum implantation concentration for the current confinement layer of RCLEDs, the effects of implantation concentration (as-grown, 10 13 ,…
Liquid crystal blue phases have a fluid lattice whose structure is stabilized by cubic defects. Blue phases, which are classified as BPIII, BPII and BPI observed on cooling, exist over a small temperature range (ca. 1 K) between isotropic and chiral nematic phases. Recently, we reported electro-optical switching with…