Materials Literature
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The air electrode, which reduces oxygen (O2), is a critical component in energy generation and storage applications such as fuel cells and metal/air batteries. The highest current densities are achieved with platinum (Pt), but in addition to its cost and scarcity, Pt particles in composite electrodes tend to be inacti…
CaFe2As2 has been found to be exceptionally sensitive to the application of hydrostatic pressure and can be tuned to reveal all the salient features associated with FeAs superconductivity without introducing any disorder. The ambient pressure, 170 K, structural/magnetic, first-order phase transition is suppressed to 1…
The catalytic properties of gold nanoparticles are determined by their electronic and geometric structures. We revealed the geometries of several small neutral gold clusters in the gas phase by using vibrational spectroscopy between 47 and 220 wavenumbers. A two-dimensional structure for neutral Au7 and a pyramidal st…
Nanotechnology is a rapidly growing science of producing and utilizing nano-sized particles that measure in nanometers. These nanomaterials are already having an impact on health care. Now-a-days we are using nanoproducts in various fields. Of these, silver nanoparticles are playing a major role in the field of nanote…
Because of their wide abundance, their renewable and environmentally benign nature, and their outstanding mechanical properties, a great deal of attention has been paid recently to cellulosic nanofibrillar structures as components in nanocomposites. A first major challenge has been to find efficient ways to liberate c…
The search for electrolyte materials with high oxygen conductivities is a key step toward reducing the operation temperature of fuel cells, which is currently above 700 degrees C. We report a high lateral ionic conductivity, showing up to eight orders of magnitude enhancement near room temperature, in yttria-stabilize…
International audience
Numerical results for the local field distributions of a family of Ising spin-glass models are presented. In particular, the Edwards–Anderson model in dimensions two, three and four is considered, as well as spin glasses with long-range power-law-modulated interactions that interpolate between a nearest-neighbour Edwa…
This study aimed to determine the relationship between cell adhesion and pyrite corrosion. In order to determine cell adhesion rates, a new in vivo imaging procedure was developed with CLSM. Total bacteria coverage rates remained low (< 14%). Adsorption isotherms pointed out two types of cell adhesion sites. Bacteria…
Abstract One property of the Hopfield neural networks is the monotone minimization of energy as time proceeds. In this article, this property is applied to minimize the energy functions obtained by finite difference techniques of the Helmholtz‐equation. The mathematical representation and correlation between finite di…
In this paper I will review the theoretical results that have been obtained for spin glasses, paying particular attention to finite-dimensional spin glasses. I will concentrate my attention on the formulation of the mean-field approach and on its numerical and experimental verifications. I will mainly consider equilib…
In this paper, we investigate in detail the electrohydrodynamic spraying of a nonbiodegradable nanocomposite polyhedral oligomeric silsesquioxane polymer developed in our laboratories and currently being explored for coating metallic stent materials. Different concentrations of the polymer have been dissolved to prepa…
Permeation of water vapor, oxygen, nitrogen, and carbon dioxide through polymer films is measured by the programed valving mass spectrometry (PVMS) method. The results are calibrated with a standard permeation rate for each gas to determine the detection sensitivity. The calibrated lower detection limits are 1.90×10−7…
Under conditions of nitrogen limitation, the general transcription factor TnrA in Bacillus subtilis activates the expression of genes involved in assimilation of various nitrogen sources. Previously, TnrA activity has been shown to be controlled by protein-protein interaction with glutamine synthetase, the key enzyme…
Nicotinamide adenine dinucleotide (NAD) derives from quinolinic acid which is synthesized in Escherichia coli from l-aspartate and dihydroxyacetone phosphate through the concerted action of l-aspartate oxidase and the [4Fe-4S] quinolinate synthase (NadA). Here, we addressed the question of the identity of the cluster…
Novel quaternary Si–B–C–N materials are becoming increasingly attractive because of their possible high-temperature and harsh-environment applications. In the present work, amorphous Si–B–C–N films were deposited on Si and SiC substrates by reactive dc magnetron cosputtering using a single C–Si–B or B4C–Si target in n…
The Sm 2 Si 2 O 7 ceramics were synthesized by solid‐state ceramic route. The calcination and sintering temperature of Sm 2 Si 2 O 7 were optimized for the best properties. The crystal structure and microstructure of the ceramic were studied by X‐ray diffraction and scanning electron microscopic methods. The low frequ…
Beta-octabromo- meso-tetra(4-carboxyl)phenyl porphyrin 6 and beta-octaphenyl- meso-tetra(4-carboxyl)phenyl porphyrin 8 were synthesized and fully characterized by (1)H NMR, UV, and HRMS. Their cytotoxicities to tumor cells were tested using MTT assays. One kind of tumor cell apoptosis induced by these anionic porphyri…
Maraging steels are a group of martensitic steels possessing ultra high strength along with good fracture toughness. Conventional 18 wt.% Ni maraging steels are very costly in part because of expensive alloying elements such as Ni and Co . Replacement of Ni by cheaper elements like Mn has been studied by many research…
Aluminum oxide (AlO x ) was deposited onto strong hydrophobic surfaces of alkanethiolate self-assembled monolayers (SAMs) by a two-stage atomic layer deposition (ALD) process; the first stage utilized n -propanol as the oxygen source, and the second stage proceeded with water. The resulting AlO x layers were character…