Materials Literature
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Abstract The injection of seawater into oil-bearing reservoirs to maintain reservoir pressure and improve secondary recovery is a well-established, mature operation. Moreover, the degree of risk posed by deposition of mineral scales to the injection and production wells during such operations has been much studied. Th…
The secondary electron emission yield of fullerene, graphite, and diamondlike carbon after low-energy N2+ ion bombardment was studied for antimultipactor applications. Nitrogen incorporation into the carbon thin films decreases their secondary emission yield, contrary to the hydrogen or oxygen effect. Carbon nitride s…
Nano-sized barium titanate powders were prepared by the high-gravity reactive precipitation (HGRP)-hydrothermal method. The properties and defects of hydrothermal barium titanate crystallites were investigated by TEM, XRD and FTIR. The mean particle size of the hydrothermal barium titanate was about 70 nm with narrow…
Mesoporous carbon with high surface area and ordered structure was synthesized via a nanocasting process using mesoprous MCM-41 silica as a template and sucrose as a carbon precursor. Sample was characterized by XRD, SEM, TEM and nitrogen adsorption. The results show that the templated carbon has a BTE surface area ∼1…
We prepared polycrystalline samples of R$_2$PdO$_4$ (R = La, Nd, Sm and Gd) using a NaCl-flux technique. The measured resistivity is of the order of 10$^3-10^4$ $\Omega$cm at room temperature, which is two orders of magnitude smaller than the values reported so far. We further studied the substitution effects of Ce fo…
A general review is first provided on the properties of this important member of the class of polyhydroxyalkanoate copolymers now being actively investigated as environmentally friendly materials. This soon to be commercialized material is already finding numerous applications and has the advantage of biodegradability…
The phase separation kinetics of polymer dispersed liquid crystals (PDLC) confined between two parallel, smooth walls are numerically studied for the first time. Only the two-dimensional (2D) system is considered for simplicity. The time evolutions of two order parameters (i.e., composition order parameter and orienta…
This paper describes the structural and dynamic properties of a hitherto uncovered alkali molten globule (MG) state of horse "ferrocytochrome c" (ferrocyt c). Several experimental difficulties mainly because of heme autoxidation and extraordinary stability of ferrocyt c have been overcome by working with the carbonmon…
Micro-Raman and electron microprobe techniques are used to show that lead zirconate titanate and samarium-doped bismuth titanate undergo local phase transformations and separation during electrical shorting and in the dendritic precursors to microshorts caused by bipolar fatigue. These precursors for shorts, consistin…
We report the magneto-optical (MO) properties of compressively strained La0.7Sr0.3MnO3 (LSMO) thin films epitaxially grown on a LaAlO3 substrate. The magnetic force microscope images show the stripe magnetic domains, characteristic of films with the perpendicular magnetic anisotropy (PMA). The optical reflectance and…
We have demonstrated a synthetic procedure for nano‐sized NaNbO 3 powder and its thin films using a carbon‐free precursor prepared by the reaction of H 2 O 2 with sodium and niobium alkoxides. A combination of X‐ray powder diffraction, Raman spectra, and thermal gravity and differential thermal analysis, carbon analys…
Magnetization, electrical resistivity, and Hall coefficient of single crystals Sb2−xFexTe3 (0<x<0.02) have been measured from 2 to 300 K. Doping diamagnetic Sb2Te3 with Fe results in a paramagnetic behavior and the exchange interaction between Fe ions is determined to be antiferromagnetic based on low-te…
In a search for efficient spectroscopic avenues toward experiments on molecular parity violation, we investigate the stereomutation tunneling processes in the axially chiral chlorine isotopomers of Cl2O2 by the quasi-adiabatic channel reaction path Hamiltonian (RPH) approach and the corresponding parity violating pote…
The dielectric relaxation spectra of D-sorbitol glass have been studied in real time during annealing at 221.1 K, which is 47 K below its T(g) of 268 K. As the glass structurally relaxes during annealing, features of the Johari-Goldstein (JG) relaxation change with time: (i) the relaxation strength decreases, (ii) the…
An extension of the Mie [Ann. Phys. 25, 377 (1908)] theory for the calculation of optical absorption spectra in bimetallic nanoparticles has been developed. The nanoparticle dielectric function is assumed to be a weighted linear combination of dielectric functions for single particles. Accordingly, analytical expressi…
Electron-energy loss spectroscopy (EELS) performed using a modern transmission scanning electron microscope (STEM) now offers sub-nanometre spatial resolution and an energy resolution down to 200 meV or less, in favourable cases. The absorption spectra, which probe empty states, cover the soft x-ray region and may be…
RATIONALE AND OBJECTIVES: Inversion recovery, three-dimensional, gradient-recalled echo magnetic resonance coronary angiography (IR-3D-GRE-MRCA), performed after administration of an intravascular T1-relaxing agent with prolonged permanence in the blood, is one of the most promising approaches to noninvasive magnetic…
${\mathrm{LaCoO}}_{3}$ displays two broad anomalies in the DC magnetic susceptibility ${\ensuremath{\chi}}^{DC}$, occurring, respectively, around $50\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and $500\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. We have investigated the first of them within the $10\phantom{\rule{0.3em}{0ex}}\ma…
The fatigue behavior of antiferroelectric lanthanum-doped lead zirconate stannate titanate bulk material induced by bipolar cycling was investigated. Strain and polarization hysteresis loops, acoustic emissions (AEs), and biaxial strength were monitored. The material showed a high resistance to electric fatigue, conce…
Abstract The electronic structures of double perovskites Ba 2 MnWO 6 and Ba 2 MnReO 6 are studied by using first‐principles linear muffin‐tin orbital method. The ground magnetic phases for the two compounds are found to be antiferromagnetic and ferrimagnetic, respectively, in agreement with experimental results. Bariu…