Materials Literature
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Various piezoelectric polymers based on polyvinylidene fluoride (PVDF) are of interest for large aperture space-based telescopes. Dimensional adjustments of adaptive polymer films depend on charge deposition and require a detailed understanding of the piezoelectric material responses which are expected to deteriorate…
BaTiO 3 /SrTiO 3 superlattices were grown on (001)MgO substrates by pulsed-laser-deposition technique. The thickness of each layer varied from 6 to 25 unit cells. Polarization-dependent Raman spectra confirmed tetragonal symmetry of the superlattices with the polar axis being normal to the layers. The observed optic m…
The thermal and ferroelectric properties of potassium nitrate (KNO/sub 3/): polyvinyl fluoride (PVF) composite films have been studied. The dielectric constant has been measured as a function of temperature and shows a sharp change during heating and cooling cycles. Differential scanning calorimetry (DSC) has been emp…
Complementary methods were used to study one of the MHPOBC analogues: 4-(1-methylheptyloxycarbonyl)phenyl-4′nonylbiphenyl-4-carboxylate (MHPNBC). The substance shows rich phase polymorphism. In addition to the para-, ferro- and antiferroelectric phases it exhibits three sub-phases (two ferri- and alpha sub-phase) and…
Cell adsorption and selective desorption for separation of microbial cells were conducted by using chitosan-immobilized silica (CIS). When chitosan was immobilized onto silica surfaces with glutaraldehyde, bacterial cells adsorbed well and retained viability. Testing of the adsorption and desorption ability of CIS usi…
Fabrication and field emission properties of a ZnO nanowire (NW) triode were investigated in this study. The ZnO NWs have a single-crystalline wurtzite structure, ∼50 nm diameter and 3.4 × 10 10 cm −2 number density. The ZnO NW triode shows good and controllable emission properties with the turn-on anode electric fiel…
Nanostructured SiOx∕Si thin films, over a large range of porosities, were deposited by the excimer laser ablation (KrF, 248nm) of Si targets in He; they have been characterized by photoacoustic Fourier transform infrared spectroscopy, which necessitates exposure to air with subsequent oxidation. In particular, the IR…
A harmonic Green's function solution for a magnetic line source above and below a flat interface between two chiral materials is derived. The solution is expressed in terms of the characteristic right and left circularly polarized waves. The harmonic Green's function formulation is converted into a modal representatio…
Carbon nitride has been synthesized in macroscopic amounts by means of the original method based on an ecologically safe technology using inorganic initial compounds. The product has been characterized by mass spectrometry (MS), X-ray diffraction, and quantitative chemical analysis. The MS and thermochemical data show…
An isotropically conductive adhesive (ICA) is a composite material consisting of a nonconductive polymer binder and conductive filler particles. When the filler content is high enough the nonconductive binder is transformed into a good electrical conductor. This transition can be described by the percolation theory. W…
The effects of charge ordering on the spin degrees of freedom is studied by using one-dimensional extended Hubbard model. The ground state property is investigated in the U →∞ limit using spin-charge factorized wave function. The effective exchange coupling J eff and spin susceptibility χ are calculated as a function…
The Raman spectra of TlGaxIn1-xS2 layered mixed crystals were studied for a wide range of composition (0 x 1) at T = 50 K. The effect of crystal disorder on the line width broadening of the Raman-active modes are discussed. The asymmetry in the Raman line shape is analyzed for two interlayer and intralayer modes exhib…
Abstract Data analysis of a fabric.s compression properties can only be done when the limits of compression are known. The best formula is van Wyk.s, although the meaning of the physical parameter is still not clear. On the basis of van Wyk.s equation, a study of the compressibility of woven fabrics can be initiated i…
Sandwich and planar structures have been fabricated using zinc phthalocyanine (ZnPc) and cobalt phthalocyanine as active layers and gold (Au) as electrodes by thermal evaporation method. The permittivity e is determined from the dependence of capacitance on film thickness. J-V characteristics of Au/ZnPc/Au and Au/CoPc…
Recently a number of new non-destructive diagnostic techniques have been investigated for the reliable condition assessment of the ageing of metal oxide surge arrester (MOSA). Among them polarization/depolarization current and return voltage measurement techniques showed very promising results. This paper presents an…
Abstract SrCe 0.95 Yb 0.05 O 3‐α (SCYb) hollow‐fiber membranes have been prepared by an immersion‐induced phase‐inversion/sintering method where polyethersulfone (PESf) is used as a binder, N‐methyl‐2‐pyrrollidone (NMP) as solvent, and polyvinylpyrrolidone (PVP, K16–18) as an additive, respectively. By a programmed si…
A three-dimensional (3-D) electrothermal model was developed to study the InP-based thin-film In/sub 0.53/Ga/sub 0.47/As/In/sub 0.52/Al/sub 0.48/As superlattice (SL) microrefrigerators for various device sizes, ranging from 40/spl times/40 to 120/spl times/120/spl mu/m /sup 2/. We discussed both the maximum cooling an…
The reactive sintering of Ti/Al 4 C 3 /C mixtures at a temperature of 1417°±5°C to form the ternary carbide Ti 3 AlC 2 was studied in situ by neutron powder diffraction. A series of intermediate phases occur during the synthesis process beginning with the formation of β‐Ti, TiC x ( x ≤1) and Ti 3 AlC. This is followed…
Yb3+Er3+-codoped chloride-modified germanate-bismuth-lead glasses have been synthesized by the conventional melting and quenching method. Structural and thermal stability properties have been obtained on the basis of the Raman spectra and differential thermal analysis, which indicate that the PbCl2 addition has an imp…
Abstract A computer program is introduced that evaluates the parameters of binary copolymerizations from comonomer/copolymer composition data as obtained from polymerization experiments with finite monomer conversion. The program numerically integrates a given copolymerization equation in its differential form and can…