Materials Literature
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doi:10.1088/0022-3727/37/19/005 We report on the magnetic and martensitic transformation properties of Co39Ni33Al28 ferromagnetic shape memory alloy ribbons. We found that the phase formation of Co39Ni33Al28 is strongly dependent on the method of preparation. The conventional as-cast ingot sample contains a large amou…
Surface-enhanced Raman scattering (SERS) of 4-nitrothioanisole (4-NTA) is investigated in Ag sol. The molecule is found to adsorb on Ag as 4-NTA via the sulfur atom. Upon irradiation by an argon ion laser at 514.5 nm, the molecule is, however, subjected to two consecutive surface-induced photoreactions, namely C−S bon…
MTT (Tetrazolium)-assay suggests that diamond-like carbon (DLC) and silicon-doped DLC (Si-DLC) films obtained under appropriate deposition parameters are not toxic to bovine retinal pericytes, and human microvascular endothelial cells (HMEC). The observed frequency distributions of the optical density (OD) values indi…
Divalent europium doped strontium di-aluminate (SrAl 4 O 7 : Eu 2+ ) nanocrystals have been synthesized using a facile sol–gel polymer thermolysis method. The photoluminescence characteristics of smaller particles (ϕ ∼ 15 nm) show a significant difference with respect to their bulk counterpart. In this nanocrystalline…
Abstract Although recent years have witnessed an impressive confluence of experiments and kinetic and statistical theories, presently there is no comprehensive understanding of the interrelation between chemical sequences in synthetic copolymers and the conditions of synthesis. For this problem, numerical simulations…
In this article, we demonstrate how a combination of engineering and biological techniques could lead to the realization of branched microstructures that can be used for the repair of damaged vascularized tissue. Recursive "treelike" networks were first generated by using fractal algorithms based on Murray's equation…
Multi-wall nanotubes (MWNTs) of carbon were produced by pulsed arc discharges between a room temperature sample and a counter-electrode, with peak currents of 7–100 A, and pulse lengths of 0.2–26 µs, in open air at selected locations on the sample. The samples were 10 × 10 mm 2 graphite plates, carbon-coated 200 mesh…
Poly(2-hydroxyethyl methacrylate) (PHEMA) films were grown onto gold via water-accelerated, surface-initiated atom transfer radical polymerization (ATRP), and the resulting side chains were modified by reaction with alkanoyl chlorides (C m H 2m+1 COCl; m = 1, 7, 11, 13, 15, and 17) to incorporate hydrocarbon side grou…
A protocol for cluster size distribution analysis was developed in order to parametrize local two-dimensional (2D) order in a quantitative manner, using mean cluster sizes and fractional hcp cluster formation (fhcp). Cluster size analysis was performed on 2D arrays of Au nanoparticles encapsulated in resorcinarene tet…
Recent experiments suggest that the high hydrogen storage capacity in graphite nanostructures might be associated with adsorption on the edges. First-principles calculations are used to study the structure and energetics of H chemisorption on graphite zigzag edges. The properties of both singly and doubly hydrogenated…
Vitreous silica is known to have several anomalous variations in its physical properties including a temperature dependent density maximum. We report the results of high-resolution density relaxation experiments that conclusively show for the first time the existence of a density minimum for silica below its glass-tra…
A constant voltage electrochemical doping method, is used in order to successfully introduce elemental erbium, Er and ytterbium, Yb into the pores of porous silicon. Er/Yb doped porous silicon emits efficiently from the UV to near-IR when excited with a 980 nm line laser (see Figure).
The dynamical interaction between columnar interface microstructure and self-stress, resulting in unforeseen mechanical deformation phenomena, is brought to light by means of in situ and real-time synchrotron x-ray topography during directional solidification of dilute aluminum alloys. Beyond long-known local mechanic…
Abstract A new class of efficient low molecular weight gelator molecules has been designed by combining 11‐aminoundecanoic acid (AUDA), lauric acid and aromatic and aliphatic amino acid units in the same molecule. This yields a special class of fatty acid amphiphiles with core chiral centres and hydrogen bonding sites…
Pesticide adsorption by soil clays can be dramatically influenced by the exchangeable cations present. Among the common exchangeable base cations in soils (Ca2+, Mg2+, K+, and Na+), K+-saturated clays frequently demonstrate the strongest affinity for pesticides. In the presence of multiple exchangeable cations in the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron Spin Resonance: A Major Probe for Molecular ConductorsClaude Coulon and Rodolphe CléracView Author Information Centre de Recherche Paul Pascal, CNRS UPR 8641, Université Bordeaux 1, 115 Avenue Dr. A. Schweitzer, 33600 Pessac, France Cite this: Chem. Rev. 2004, 104,…
Two cyanide-bridged molecular cubes of general formula [{MCl}4{ReII(triphos)(CN)3}4], M=Fe, Co (depicted), triphos=1,1,1-tris(diphenylphosphanylmethyl)ethane, and their magnetic properties are reported. The cubes are prepared in good yields from the reaction of the ReII complex [Et4N][ReII(triphos)(CN)3] with the appr…
Electrogenerated chemiluminescence (ECL) was used to image the spatial variations in electrochemical activity at the heavily doped polycrystalline diamond surface. ECL was generated by the reaction of [Ru(bpy) 3 ] 2+ and tripropylamine. Images of the chemiluminescence patterns at the polycrystalline diamond surface we…
The dielectric environment surrounding poly(N-isopropylacrylamide) in aqueous solution was investigated by probing with spirobenzopyran covalently attached as a side chain to the polymer main chain. Inherent characteristics of the spirobenzopyran chromophore were analyzed, and the chromophore was confirmed to be suita…
Abstract Das Design, die Synthese und die Selbstorganisation einer neuen Klasse vollständig substituierter Arene, die kolumnare Überstrukturen bilden, werden in diesem Kurzaufsatz detailliert beschrieben. Die Selbstorganisation dieser Moleküle führt zur Bildung von helicalen und polaren Säulen, deren Anordnung mit ele…