Materials Literature
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The point contact Andreev reflection employing niobium tips was used to determine the degree of transport current spin polarization $({P}_{t})$ at the free surface of bulk $\text{NiMnSb}$ at $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The data was analyzed within the framework of a modified version of the Blonder, Tin…
With a view to obtain a molecular model for the subphases produced by the frustration between ferro- and antiferroelectricity in chiral smectic liquid crystals, we report results on two compounds and observe (i) the staircase character of uniaxial Sm C(*)(alpha) itself in the bulk and (ii) the multipeaked characterist…
ADVERTISEMENT RETURN TO ISSUEPREVNoteShear-Induced Mesophase Organization of Polyanionic Rigid Rods in Aqueous SolutionTakafumi Funaki, Tatsuo Kaneko, Kanji Yamaoka, Yutaka Ohsedo, Jian Ping Gong, Yoshihito Osada, Yuzo Shibasaki, and Mitsuru UedaView Author Information Division of Biological Sciences, Graduate School…
We describe a unified semi-empirical approach for predicting the viscosity of dilute and concentrated hard and soft sphere systems. A variable specific volume, k was introduced to convert the mass concentration to effective volume fraction. With increasing particle concentration, the concentration of free counter-ions…
The sonoluminescence (SL) from the collapse of a single gas bubble within a liquid can be produced repetitively using an acoustic resonator. An alternative technique using a water hammer tube, producing SL from bubbles of greater size, is described here. A sealed vertical tube partly filled with a liquid and a gas at…
The effect of dispersed-phase elasticity on steady-state deformation and breakup of isolated droplets for polybutadiene/poly(dimethyl siloxane) blends in simple shearing flow is investigated systematically for values of the dispersed-phase Weissenberg number (Wid) ranging up to around 3, where the Weissenberg number i…
Electronic structure, energy bands, and magnetic properties of Cr-doped GaN have been calculated from first principles using a 32 atom supercell within the frame work of linearized muffin-tin orbital tight binding method and gradient-corrected density-functional theory. The coupling between Cr atoms is found to be fer…
SiO 2 and TiO2, with their high refractive index contrast, are interesting candidates for the fabrication of graded-index optical filters. In this work, SiO2/TiO2 mixtures were prepared by plasma-enhanced chemical vapor deposition from SiCl4 and TiCl4. By controlling the gas flow ratio, it is possible to obtain coatin…
Recent studies have led to a rapid increase in knowledge of auxospore formation in diatoms. However, these studies have been limited to centric and raphid pennate diatoms, and there is still very little information for the araphid pennate diatoms. Using LM and SEM, we studied the development of the auxospore and the i…
The synthesis of 4-N-[3',4',5'-tris(dodecyloxy)benzamido]benzene-4-sulfonic acid (1) and 4'-[3",4",5"-tris(dodecyloxy)benzoyloxy]azobenzene-4-sulfonic acid (2) is described. Pure acid 1 is stable, while 2 can be stored only in solution. Both acids were obtained from their sodium salts and were quantitatively transform…
We report a novel experimental study on the jamming transition of dry fine powders with controlled attractive energy and particle size. Like in attractive colloids dry fine particles experience diffusion-limited clustering in the fluidlike regime. At the jamming threshold fractal clusters crowd in a metastable state a…
The self-assembly of a series of small peptidomimetic cyclophanes in organic solvents was studied. X-ray diffraction, NMR spectroscopy, and molecular modelling were used to understand the structural features of these self-assembling compounds both at the molecular and supramolecular level. The factors that could influ…
The aim of this work is to model the flow-enhanced crystallization and the flow-induced morphological changes of semi-crystalline materials during and after shearing flow. A FENE-P dumbbell model and a rigid dumbbell model are used to describe the molecular chain conformation and the orientation evolution for the amor…
Homopolycouplings of aryltriynes Ar(C⋮CH) 3 and their copolycouplings with monoyne Ar‘C⋮CH are effected by CuCl in air under Glaser-Hay oxidative coupling conditions, giving soluble hyperbranched polyynes ( hb- PYs). Hyperbranched poly[tris(4-ethynylphenyl)amine] emits bright blue light ( λ em = 440 nm) and shows high…
Luminescence induced by friction, mechanoluminescence (ML) has been observed for ${\text{ZnAl}}_{2}{\mathrm{O}}_{4}:$ ${\text{Mn}}^{2+}$ $(\text{ZAO}:\text{Mn})$ fabricated by systematically controlling the reducing temperature. The reducing treatment produced lattice defects under a reducing atmosphere. Those defects…
A series of bis(tert-butylphosphine)- and bis(cyclohexylphosphine)-functionalized Pd(II) monomers and polyamino (DAB) dendritic catalysts were synthesized and investigated for Sonogashira carbon-carbon coupling reactions in a copper-free procedure. The influence of phosphine substituents (tBu versus Cy) on the reactio…
Three terbium complexes Tb(tba-PMP) 3 (TPPO) ( A ), Tb(tba-PMP) 3 (H 2 O) ( B ), and Tb(tba-PMP) 3 (Phen) ( C ) (where tba-PMP, TPPO, and Phen stand for β-diketone 1-phenyl-3-methyl-4-( tert -butylacetyl)-5-pyrazolone, triphenyl phosphine oxide, and 1,10-phenanthroline, respectively) with different neutral ligands wer…
The experimental electron density of the high-performance thermoelectric material Zn4Sb3 has been determined by maximum entropy (MEM) analysis of short-wavelength synchrotron powder diffraction data. These data are found to be more accurate than conventional single-crystal data due to the reduction of common systemati…
The electrical field gradient (EFG), measured e.g. in perturbed angular correlation (PAC) experiments, gives particularly useful information about the interaction of probe atoms like 111In / 111Cd with other defects. The interpretation of the EFG is, however, a difficult task. This paper aims at understanding the inte…
We perform molecular dynamics simulations to study the structural relaxation dynamics of a model of viscous silica, the prototype of a strong glass former. We find that the melt dynamics are spatially heterogeneous regardless of whether the bulk relaxation is non-Arrhenius or Arrhenius, and cannot be understood as a s…