Materials Literature
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The temperature- and doping-induced variation of structural, magnetic, and transport properties has indicated unique switching of spin-charge-orbital states in the Mn-O sheets of single-layered manganite crystals, ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{1+x}{\mathrm{MnO}}_{4}.$ In the composition range of $0.7…
Within the framework of a project for the better understanding of the behaviour of polyethylene under specific operating conditions, the temperature influence on a polyethylene base resin was studied. A differential scanning calorimetry analysis has shown the effect of annealing on morphological changes. The first was…
Abstract The electrodeposition of polyaniline–polypyrrole composite coatings on aluminum was successfully performed by using cyclic voltammetry. Oxalic acid was used as the electrolyte. Electrodeposition was carried out at a scan rate of 20 mV/s by varying the number of cycles. An anodic peak current at around −0.1 V…
A dodecagonal quasicrystalline phase was grown in nano-sized Ag-Pt multilayers upon solid-state reaction and the existence of the respective metastable state in the Ag-Pt system was also confirmed by ion-beam mixing experiments. The major driving force for intermixing between the nano-sized Ag and Pt layers, as well a…
We have studied the crystal structure, the magnetic and electron transport properties and the magnetoresistance effect of nitrogenation of La2/3Ca1/3MnO3 by x-ray powder diffraction, magnetic measurement and standard four-probe resistance-temperature measurement. Nitrogenation results in an increase in the lattice par…
Herein, we present a semiquantitative thermal study of the chemical reactions when hydrogen cyanide (HCN) and sulfuric acid (H 2 SO 4 ) are mixed with each other. In this study, we have covered a range of sulfuric acid concentrations (59−99 wt %) and HCN/H 2 SO 4 mole ratios (0.25−15) and identified “hazardous zones”…
Abstract Polyimide containing an indan unit and alkyl moiety with a high molecular weight was prepared from 5,7‐diamino‐1,1,4,6‐tetramethylindan and 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride. This polyimide was amorphous and soluble in common organic solvents, such as tetrahydrofuran, chloroform, and cyclopen…
Complex geometry structures, such as produced by imperfections, cause the electric field to reach a very high local value even at low applied voltages. These are often the initiators of breakdown. Though direct measurement methods for space charge and electric field can be used only for planar or coaxial geometry, the…
A high-throughput and systematic study of complex material systems is described. Initial efforts using thin-film discrete material chips are briefly reviewed from the perspective of materials discovery and optimization, and the limitations of the method are discussed. We then focus our discussion on the experimental t…
Nanocrystalline CdS and CdS-ZnO thin films were deposited at room temperature using high-pressure radio-frequency magnetron sputtering. The CdS-ZnO nanocomposite film was made up of particles smaller than 2 nm and showed a composite band gap of 2.72 eV. Both samples showed appreciable photoconductivity, extremely fast…
Ferroelectric materials have attracted attention in recent years because of the combination of these materials with integrated circuit technology. Although much effort has been made to develop new devices by the use of these materials, there is still much to do to understand the so-called domain effects at submicromet…
The structure of electrodes in the electrochemical formation cell of porous silicon greatly influences the planar uniformity of the porous silicon layer. In this paper a systematic study of the planar uniformity of large area porous silicon layer formed by different electrode structure is reported based on photolumine…
Novel enantiomerically pure telechelic OH-terminated poly[( R )-3-hydroxyoctanoate] (PHO-diol), poly[( R )-3-hydroxyoctanoate- co -poly[( R )-3-hydroxy-7-oxooctanoate] (PHOO-diol), and poly[( R )-3-hydroxyoctanoate- co -poly[( R )-3-hydroxy-7-octenoate] (PHUO-diol) have been synthesized in 80−91% yield from the corres…
The structural and luminescent properties of nanocrystalline silicon produced by high-energy ball milling of Si single crystals have been investigated using transmission electron microscopy (TEM), x-ray diffraction (XRD) and cathodoluminescence (CL) in a scanning electron microscope. XRD measurements show that the ave…
A fluorescent photolabile group including coumarin and MeNPOC moieties was synthesized to protect 5′-OH terminal function of thymidine (T). Its photochemical and photophysical properties were studied, in particular the photocleavage (photodeprotection under a 365-nm irradiation) is only lowered by a factor of two by a…
The specific heat and thermal expansion of the same polycrystalline samples of ${\mathrm{La}}_{0.65}{\mathrm{Ca}}_{0.35}{\mathrm{MnO}}_{3},$ with either ${}^{16}\mathrm{O}$ or ${}^{18}\mathrm{O},$ have been measured for $85<T<310\mathrm{K}$ in zero field and in magnetic fields to 60 kOe. Anomalies at ${T}_{C}{(}…
The E 8 lattice is constructed in terms of icosians by matching two sets of F 4 lattices described by quaternions. Embedding the noncrystallographic group H 4 into the Weyl group W ( E 8 ) has been described using matrix generators with an emphasis on the relevant Coxeter elements. The conjugacy classes of H 4 in term…
The kinetics of electric-field-induced ferroelectric phase transitions in relaxor ferroelectrics observed recently [S. B. Vakhrushev, J. M. Kiat, and B. Dkhil, Solid State Commun. 103, 477 (1997); B. Dkhil and J. M. Kiat, J. Appl. Phys. 90, 4676 (2001)] is analyzed in the framework of a dynamical model of relaxors whi…
This work reports how resonance Raman experiments are used to study details of the electronic structure of individual single-wall carbon nanotubes (SWNTs) by measuring the phonon spectra and how the quantized electronic structure affects the dispersive Raman features of SWNTs. We focus our analysis on the dispersive D…
The crystal structure of cadmium cyanamide was investigated by X-ray powder analysis and refined using the Rietveld method. Very fine powders of CdCN2 in the nanometre range were obtained by chemical bath deposition. The size, shape and microstrain were characterised by X-ray diffraction and transmission electron micr…