Materials Literature
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We report a detailed experimental and theoretical study on the electronic and optical properties of highly boron-substituted (up to $15\phantom{\rule{0.3em}{0ex}}\text{at.}%$) single-wall carbon nanotubes. Core-level electron energy-loss spectroscopy reveals that the boron incorporates into the lattice structure of th…
Abstract Mechanical properties and thermal and structural changes of poly(vinyl chloride) (PVC)/wood sawdust composites were assessed with respect to the effect of moisture content, varying from 0.33 to 3.00 % by weight in the composite, for three different wood sawdust contents. The swell ratio and texture characteri…
As dense granular materials are sheared, a shear band and an anisotropic force network form. The approach to steady state behavior depends on the history of the packing and the existing force and contact network. We present experiments on shearing of dense granular matter in a 2D Couette geometry in which we probe the…
A quantum kinetic theory is used to compute excitation induced dephasing in semiconductor quantum dots due to the Coulomb interaction with a continuum of states, such as a quantum well or a wetting layer. It is shown that a frequency dependent broadening together with nonlinear resonance shifts are needed for a micros…
New results are presented for the degeneracy condition of elastic waves in anisotropic materials. The existence of acoustic axes involves a traceless symmetric third order tensor that must vanish identically. It is shown that all previous representations of the degeneracy condition follow from this acoustic axis tenso…
We present experimental results on the photoluminescence (PL) of gas-suspended zinc oxide nanoclusters prepared during ablation of sintered ZnO targets by a pulsed ArF laser in the presence of oxygen ambient gas. The PL spectra in the UV spectral region correspond to the exciton recombination in the nanoclusters which…
The paper is devoted to the memory of Brian Wybourne the pioneer in theory of symmetry and spectra of trivalent rare earths. We evaluate here the influence of site symmetry of the surrounding molecules in glass matrices on europium ion used as a probe. A method by which systematic classification can be performed on de…
Novel colloidosome microcapsules with aqueous gel cores and integral shells of rodlike polymeric particles have been prepared and characterized. The synthesis is based on templating water-in-oil emulsions stabilized by rodlike particles followed by gelling of the aqueous phase, dissolution of the oil phase in ethanol,…
Magnetoelectric compounds with the general formula, ${\mathrm{Bi}}_{0.9\ensuremath{-}x}{R}_{x}{\mathrm{La}}_{0.1}{\mathrm{FeO}}_{3}$ $(R=\mathrm{Gd},$ Tb, Dy, etc.), have been synthesized. These show the coexistence of ferroelectricity and magnetism, possess high dielectric constant and exhibit magnetoelectric couplin…
A two-tiered organizing scheme with multiple-length scales for construction of dandelion-like hollow CuO microspheres has been elucidated: (1) mesoscale formation of rhombic building units from smaller nanoribbons via oriented aggregation and (2) macroscopic organization of these units into the CuO microspheres. This…
Understanding the suppression of ferroelectricity in perovskite thin films is a fundamental issue that has remained unresolved for decades. We report a synchrotron x-ray study of lead titanate as a function of temperature and film thickness for films as thin as a single unit cell. At room temperature, the ferroelectri…
In this paper, we present for the first time a Raman spectroscopic method for the determination of molecular orientation in uniaxially oriented polysulfone (PSU).
Abstract The single crystals of Methyl‐p‐Hydroxy Benzoate (MHB) were grown by solution growth technique and characterized by X‐ray diffraction (single crystal), density, melting point, UV‐Vis, FT‐IR and FT‐Raman techniques. Electron Paramagnetic Resonance (EPR) spectra of Cu 2+ : MHB were recorded and the spin Hamilto…
Abstract A new series of liquid‐crystalline epoxy resins was synthesized, and their mesomorphic behavior was investigated with differential scanning calorimetry, polarized optical microscopy, and wide‐angle X‐ray scattering. These glycidylic compounds had central aromatic imine mesogens derived from benzidine and alip…
Abstract Nano CdS samples are synthesized by precipitation method for different growth conditions. Thermal diffusivity and conductivity on these nano CdS are measured by photo acoustic technique. The results are compared with bulk and discussed. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
This paper describes two different techniques for thermally enhanced photoinduced reorientation of liquid crystalline polymethacrylate (PLC) films that contain 4-methoxyazobenzene side groups with various alkylene spacer lengths. One is the classical method based on photoselection and rotational diffusion in the stead…
Zustände sichtbar gemacht: Mott-Hubbard- und Ladungsdichtewellen-Zustände wurden in den quasi-eindimensionalen, Brom-verbrückten Ni- bzw. Pd-Komplexen [M(chxn)2Br]Br2 mithilfe der STM-Technik nachgewiesen (für den Ni-Komplex gezeigt, der Pfeil deutet die Richtung der Kette an). Das Spinsoliton wurde außerdem erstmals…
Abstract The mixed conducting nature of the lithium vanadate Li x V 2 O 5 (x = 0.4 – 1.4) prepared by solid state reaction has been analyzed by Wagner's polarization method. The increase of electronic conductivity with increase in lithium content has been observed. The low diffusion constant has been observed for lith…
We study the effects of the relativistic electronic dressing in laser-assisted electron-hydrogen atom elastic collisions. We begin by considering the case when no radiation is present. This is necessary in order to check the consistency of our calculations and we then carry out the calculations using the relativistic…
Abstract Fracture properties and deformation mechanisms of nanoclay‐reinforced maleic anhydride‐modified polypropylene (MAPP) were investigated. Elastic–plastic fracture mechanics was employed to characterize the toughness in light of substantial postyield deformation for the reinforced MAPP. Upon introduction of 2.5…