Materials Literature
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Summary The uptake of iodine species (I − /IO 3 − ) by HCP (hardened cement paste) and a CSH (calcium silicate hydrate) phase under highly alkaline conditions has been investigated using X-ray absorption spectroscopy (XAS). The study was performed at the I K-edge (33.169 keV) instead of the I L 3 -edge (4.557 keV) to…
Polycrystalline Mn–Zn ferrites substituted with different rare earth ions (R = La, Nd, Sm, Gd and Dy) are investigated. X-ray diffraction analysis showed a single spinel phase. On substitution, the lattice parameter remained unchanged, the porosity is increased and the grain size is decreased relative to the unsubstit…
Silicon oxycarbide (SiOC) ceramic foams, obtained from the pyrolysis of a preceramic polymer, were subjected to thermal multiple cycles from 800°–1200°C to room temperature in a water bath. Flexural and compression strengths, as well as elastic modulus, were characterized before and after quenching. Excellent thermal…
Self‐propagating high‐temperature synthesis is a very easy and low‐cost method to synthesize Si 3 N 4 . The nitriding of silicon powder takes place in a self‐sustained regime under high pressures of nitrogen with dilution of silicon by Si 3 N 4 . In this work effects of dilution and green‐mixture porosity on combustio…
Phase transition and dielectric properties of La-doped Pb(Zr,Sn,Ti)O3 antiferroelectric ceramics under hydrostatic pressure and temperature have been studied, and effects of temperature on the pressure-induced phase transition and the dielectric property dependence on the applied hydrostatic pressure have been investi…
Ba2CoBO6 (B = Mo, W) perovskites have been prepared in polycrystalline form by thermal treatment, in air, of previously decomposed citrate precursors. These materials have been characterized by X-ray (XRD) and neutron powder diffraction (NPD) data and magnetization measurements. At room temperature, the crystal struct…
Abstract The objective of this work was to obtained stable nanocapsules (NC), that is to say a core shell structure by a recently patented method, the emulsion diffusion of solvent. To study the capacity of encapsulation, the aim was first to control the nanocapsules size distribution before the characterization of th…
We have measured the dielectric relaxation of neat cis/trans-decahydro-naphthalene (decalin) in its supercooled regime as a function of temperature. The fragility of this nonaromatic molecular glass former is extremely high, m=147, and the distribution of relaxation times in terms of the stretching exponent is accordi…
Abstract The use of hydrogen storage based on an adsorption process for cars operating on a fuel cell will be seriously considered when the amount of stored gas is high enough, the tank safe and economically viable, and the filling process fast enough. To maximize the storage capacity for rapid filling, it is necessar…
Magnetic shape memory Ni/sub 49.7/Mn/sub 28.7/Ga/sub 21.6/ alloy was prepared in the form of the thin ribbon by a planar-flow casting method. Optical microscopy and X-ray diffraction were used to check the microstructure of as-quenched and annealed ribbons (800C/24 h and 72 h). The as-quenched ribbon was microcrystall…
Single crystalline Ni/sub 48.7/Mn/sub 29.1/Ga/sub 22.2/ sample was studied in the temperature range 110 K-425 K. Magnetic properties of four different structure phases were measured at different temperatures. The magnetic anisotropies of the different phases were determined from magnetization curves. At room temperatu…
We present an extension of the rigorous coupled-wave analysis technique to analyze second-harmonic generation (SHG) in periodic optical nanostructures in the undepleted-pump approximation. We apply this method to analyze SHG in two example nanostructures for which we predict enhanced nonlinearity due to transverse nea…
Abstract Fracture initiation and fracture propagation toughening (R‐curve behavior) of polyamide 6,6 (PA‐66) polymers with different types of layered silicate clay having nanoscale (fully dispersed) or multiscale (mixed nanoscale/microscale) structure were studied. These results were compared to fracture data for conv…
Inverse Fourier transform method has been commonly used for designing complex inhomogeneous optical coatings. Since it assumes dispersion-free optical constants, introducing real optical materials induces shifts in the position of reflectance bands in multiband inhomogeneous minus (rugate) filters. We propose a simple…
Poly(butyl cyanoacrylate) nanoparticles coated with polysorbate 80 (Tween 80) enable the transport of a number of drugs across the blood-brain barrier (BBB) into the brain following intravenous injection. These drugs include the hexapeptide endorphin dalargin, the dipeptide kytorphin, loperamide, tubocurarine, doxorub…
The Escherichia coli fabG(Ec) gene and the Pseudomonas aeruginosa rhlG(Pa) gene, which encode 3-ketoacyl-acyl carrier protein reductase, were expressed in E. coli W3110 and its fadA mutant strain WA101 to examine their roles in medium-chain-length (MCL) polyhydroxyalkanoate (PHA) biosynthesis from fatty acids. When on…
The corrosion behavior of Al 2024-T3 (UNS A92024) exposed to artificial seawater (AS) and Luria Bertani (LB) medium has been studied using electrochemical impedance spectroscopy (EIS). Tests were performed in sterile media and in the presence of three different biofilm-forming bacteria: a Bacillus subtilis biofilm tha…
Porous-silicon (PS) based multilayer periodic structures with photonic bandgaps (PBGs) and PS single layers that have a strong in-plane birefringence are produced by the electrochemical nanostructuring of crystalline silicon wafers of different crystallographic orientations. Calculations and experiments demonstrate th…
The ability of portable electronic products like cellular phones and personal digital assistants to withstand accidental impacts and shock is a valuable attribute consumers expect and manufacturers desire. Usually, manufacturers conduct expensive experimental drop tests to determine the fragility of such products duri…
Summary The organic matter in soils may be stabilized by its interactions with minerals. We have studied such interactions in a Haplic Alisol under forest in which clay and organic matter have migrated from an eluvial A horizon to accumulate in an illuvial B horizon. We have tried to trace the fate of organic matter i…