Materials Literature
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A new route to thermoreversible networks through gelling ferroelectric liquid crystals is presented. A reversible stabilization of one polar state can be achieved. On heating the gel, the network and therewith the polar orientation will be destroyed and on cooling a new polar orientation can be rebuilt. The Figure sho…
Many modem induction motor applications involve nonsinusoidal voltage supply. Under such operating conditions the motor performance can be seriously affected while the standard equivalent circuit is no more adequate for the motor analysis. In this paper, a modified equivalent circuit topology is introduced in order to…
The coupling reaction at the immiscible polymer−polymer interface formed between bilayer films composed of amorphous polyamide (aPA) and polysulfone (PSU) incorporating different functional groups was monitored by X-ray photoelectron spectroscopy (XPS). The overall coupling reaction was consistent with pseudo-first-or…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation B. Wolf, W. J. Frith, Ian T. Norton; Influence of gelation on particle shape in sheared biopolyme…
Lead zirconate titanate (PZT) thin films were prepared on Pt/Ti/Corning 7059 glass substrates by RF magnetron sputtering using a Pb(Zr 0.5 ,Ti 0.5 )O 3 ceramic target. X-ray diffraction studies were performed on the films to optimize the sputtering pressure, O 2 /(Ar+O 2 ) mixing ratio (OMR), annealing temperature and…
We investigate the systematic error due to neglect of elastic scattering of photoelectrons in measurements of the thicknesses of thin films of SiO2 on Si by x-ray photoelectron spectroscopy (XPS). Calculations were made of substrate Si 2p photoelectron currents excited by Mg and Al Kα x rays for different SiO2 thickne…
Reported here are some temperature-dependent and excitation-dependent photoluminescence (PL) results from chlorine-doped ZnSe layers grown by molecular beam epitaxy. The PL spectrum is characterized by an overwhelming exciton recombination emission at 2.797 eV (10 K) near the band edge, and no other PL features are fo…
Deep ultraviolet optical fibers are fabricated using modified SiO/sub 2/ glasses containing 2000-ppm fluorine for the clad and 200 ppm for the core. The transmission at 193 nm is improved to more than 60%/m by optimizing the fiber drawing condition. The H/sub 2/-inpregnation into the fiber suppresses the degradation o…
Ho2Te4O11 (monoklin, C2/c; a = 1240,73(8), b = 511,21(3), c = 1605,84(9) pm, β = 106,142(7)°; Z = 4) und Ho2Te5O13 (triklin, P1; a = 695,67(5), b = 862,64(6), c = 1057,52(7) pm, α = 89,057(6), β = 86,825(6), γ = 75,056(6)°; Z = 2) entstehen durch Umsetzung von Holmiumsesquioxid mit Tellurdioxid in geeigneten molaren V…
The composition of (Ag 1- y Li y )(Nb 1- x Ta x )O 3 ceramics has been investigated by X-ray analysis and dielectric measurement. Li 1+ was substituted into the Ag 1+ lattice site of Ag(Nb, Ta)O 3 ceramics. The solubility limit of Li 2 O in Ag(Nb, Ta)O 3 was estimated to be in the range from 10 to 15 mol%. The crystal…
The electromechanical properties of 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 〈001〉-oriented crystals have been investigated under unaxial stress (σ). The results demonstrate enhanced piezoelectric coefficients and electroacoustic power densities with increasing σ. However, these increases are accompanied by significant increases…
(2001). A regional diatom-based trophic state indication system for running water sites in Upper Austria and its overregional applicability. SIL Proceedings, 1922-2010: Vol. 27, No. 6, pp. 3376-3380.
The symmetry operations for armchair, zigzag, and chiral boron nitride nanotubes (BN-NT's) are identified. It is found that each type belongs to a different family of nonsymmorphic rod groups. Armchair BN-NT's with even index n are found to be centrosymmetric. We determine the numbers of Raman- and infrared-active vib…
Sculptured thin films (STFs) are nanostructured materials with unidirectionally varying properties that can be designed and realized in a controllable manner using century-old techniques of physical vapor deposition (PVD). The ability to virtually instantaneously change the growth direction of their columnar morpholog…
Novolac resin and the esterified novolac resins with CH3COO—, CH3CH2CH2COO—, and C6H5CH2COO— side groups are used as curing agents for epoxy resin. The cured resins are referred to as EP, EPA, EPB and EPP for the respective agents. The influence of the side groups on the water absorption behavior of the cured epoxy re…
Activated critical dynamics and vanishing of the susceptibility ratio a 3 = χ 3 /χ 1 4 → 0 in the zero-frequency limit unequivocally evidence the phase transitions of the uniaxial relaxor crystals SBN, SBN:Ce and SBN:Cr to refer to the three-dimensional random-field Ising universality class. The relaxor-like freezing…
Abstract Composites of wood with polyethylene, polypropylene, and poly(vinyl chloride) represent an emerging class of materials that combine the favorable performance and cost attributes of both wood and thermoplastics. One of the major disadvantages, however, of these materials is a relatively high specific gravity c…
A comparison of the crystal structure of the dimeric enzyme citrate synthase from the psychrophilic Arthrobacter strain DS2-3R with that of the structurally homologous enzyme from the hyperthermophilic Pyrococcus furiosus reveals a significant difference in the accessibility of their active sites to substrates. In thi…
A description of the pressure dependence of the structural relaxation time has been derived from the Adam-Gibbs theory by writing the configurational entropy in terms of the excess heat capacity and the molar thermal expansion. This new equation was tested successfully on dielectric relaxation data for an epoxy compou…
The dielectric, ferroelectric and piezoelectric characteristics of Sr 1- x Ca x Bi 2 Ta 2 O 9 ( x =0–1) ceramics were examined. The samples were prepared by a conventional ceramic technique at 1260°C to 1340°C for 2 h. The Curie temperature of samples gradually rose from 324°C to 896°C when x was increased. The coerci…