Materials Literature
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Polymer-like amorphous carbon (a-CO x :H and a-CN x :H) films were deposited using two types of supermagnetron plasma, i.e., Ar sputter and i-C 4 H 10 /N 2 chemical vapor deposition (CVD), respectively. The sp 2 clustering of these films was proved experimentally by Raman scattering and the estimation of optical band…
Abstract A series of Emulsion SBRs (E-SBR) with polar and nonpolar third co-monomers are studied in silica filled compounds. The applied third co-monomers include polar types such as acrylonitrile (ACN), hydroxypropyl methacrylate (HPMA) and 1-vinylpyridine (VP) and nonpolar types such as isoprene and 1,3-pentadiene.…
This paper discusses the effects of carbon nanofiber surface treatment (purification and chemical functionalization) and carbon nanofiber volume fraction on mechanical properties of thermoset vinyl ester polymer nanocomposites under tensile and flexural loadings. Highly graphitic carbon nanofibers were surface treated…
Temperature sensing system has been designed and fluorescence lifetime measurements have been performed to estimate the temperature. (4)S(3/2) lifetime of LaF(3):Er(3+) and (5)S(2) lifetime of LaF(3):Ho(3+) have been measured as a function of temperature. Lifetime versus temperature calibration plots have been made up…
The phase transformation of annealed and poled 0.955Pb(Zn1/3Nb2/3)O3–0.045PbTiO3 (PZN-4.5%PT) single crystals has been studied by means of combined bulk property measurements (dielectric permittivity and thermal current density measurements) and microstructural characterization (polarized light microscope and high-res…
As the overall structure of how electricity is delivered continues to change, ultracapacitor is considered as a possible energy storage device. Its application considerations range from electronics to large scale power systems. Much of its current uses in large scale applications, however, are focused on transportatio…
Abstract Polycrystalline samples of Ba4SrRTi3V7O30 (R=Sm and Dy), members of the tungsten-bronze family, were prepared using a high-temperature, solid-state reaction technique and studied their electrical properties (using complex impedance spectroscopy) in a wide range of temperature (31–500°C) and frequency (1 kHz-1…
Barium titanate (BaTiO(3)) nanoparticles from 27 to 192 nm were prepared by the 2-step thermal decomposition method from barium titanyl oxalate nanoparticles. These particles were dispersed well into 1-propanol, and dense BaTiO(3); nanoparticle sphere arrays without stress-field were prepared by the meniscus method. T…
In this paper, we report the properties and the optimization of Y 2 O 3 :Eu cathodoluminescent thin film phosphor fabricated by electron-beam evaporation. Films were grown on quartz substrates and showed (111) orientation of cubic yttria. The Influence of film fabrication temperature regimes on the morphology and low-…
The technology of ceramic BiFeO 3 , Bi 0.95 Nd 0.05 FeO 3 , and Bi 0.95 La 0.05 FeO 3 multiferroics is described. The room-temperature magnetization, magnetoelectric (ME), and magnetodielectric (MDE) effects in these compounds have been studied. It is established that even a small fraction ( x = 0.05) of rare-earth ad…
Two selective chemical treatments consisting of mixtures of (i) oxalic acid -ammonium oxalate at pH 3 (OX) and (ii) sodium citrate -ascorbic acid at pH 6 (CA) were used to selectively remove minerals from clay fractions of four volcanic soils: one from an Ultisol and three Andisols, of the southern Chile. Chemical ana…
A photopolymerisable monomer/liquid crystal (LC)/chiral dopant/photoinitiator mixture with a smectic A (SmA*)–chiral nematic (N*) phase transition was prepared. After the SmA* phase was homeotropically oriented and then irradiated by ultraviolet light, a homeotropically oriented polymer network was formed in the SmA*…
An aqueous-based citrate precursor route has been adopted for the synthesis of KNbO 3 nanopowders. The required amount of KNO 3 or C 6 H 5 O 7 K 3 ·H 2 O solution was mixed with citric Nb solution to form white precipitates, followed by heat treatment at 800 °C to produce KNbO 3 nanopowders with an average particle si…
The phase structure and electronic properties of c-ZrO2, t-ZrO2 and m-ZrO2 are calculated and compared using density functional theory. By calculating the energies for different lattice constants, the crystal structures of the three zirconia polymorphs are optimised. The calculation results are in good agreement with…
ABSTRACT Hi‐Nicalon SiC (silicon carbide) fibres were annealed in an argon flow for 10 h at 1400 °C, 1600 °C and 1800 °C. The strength of the fibres was determined by a monofilament tensile testing machine, their fracture surfaces were analysed by SEM (scanning electron microscope) and their microstructure was charact…
Abstract Strength of the fabric is an important property that decides and influences all other performance properties of the fabric. But though we all understand the importance of the strength of the fabric in daily wear, a systematic approach is required to correlate various strength properties with that of the yarn…
Abstract Tetraamminezinc(II) dipermanganate ([Zn(NH 3 ) 4 ](MnO 4 ) 2 ; 1 ) was prepared, and its structure was elucidated with XRD‐ Rietveld ‐refinement and vibrational‐spectroscopy methods. Compound 1 has a cubic lattice consisting of a 3D H‐bound network built from blocks formed by four MnO $\rm{ {_{4}^{-}}}$ anion…
A model is proposed for the LaTiO 3 compound, which allows for the strong coupling of the lattice, orbital, and magnetic subsystems of this crystal. The interaction of the lattice with the electronic structure of the LaTiO 3 compound is described by the vibronic Hamiltonian with the constants calculated using the ab i…
Single-crystalline Pt (SC-Pt) films 15–60 nm thick with an atomically flat surface were coherently grown on SrTiO 3 (100) substrates by rf magnetron sputtering using Ir buffer layers. In the epitaxial growth of PbTiO 3 films on SC-Pt films by metalorganic chemical vapor deposition, square nanoislands with heights of 3…
The present review is concerned with the way that the incorporation of carbon nanotubes (CNTs) into a fluid matrix can modify the microstructure and rheology of the resulting suspensions. Some background to CNT manufacture and in particular methods of dispersing them into a suspension is presented for a range of diffe…