Materials Literature
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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…
Complex permittivity, permeability and electromagnetic wave absorption of α-Fe/C(amorphous) and Fe2B/C(amorphous) nanocomposites, Jiu Rong Liu, Masahiro Itoh, Takashi Horikawa, Masaru Itakura, Noriyuki Kuwano, Ken-ichi Machida
Reflectance calculations for diamond-like carbon (DLC) antireflection thin-film coatings on porous silicon (PS) have been carried out using the optical matrix approach method. Comparison with the reflectance spectrum obtained for other antireflection coatings shows a much lower reflectance with a larger energy range i…
Several sequencing projects unexpectedly uncovered the presence of genes that encode ribulose 1,5-bisphosphate (RuBP) carboxylase/oxygenase (RubisCO) in anaerobic archaea. RubisCO is the key enzyme of the Calvin-Benson-Bassham (CBB) reductive pentose phosphate pathway, a scheme that does not appear to contribute great…
Dramatic enhancement of the $n$-type conductivity of nanocrystalline diamond films by introducing up to $0.2\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%$ of nitrogen into the film has been reported. Previously, there were some theoretical predictions about the change of electronic structure of t…
NAD-independent lactate dehydrogenases are commonly thought to be responsible for lactate utilization during the stationary phase of aerobic growth in Lactobacillus plantarum. To substantiate this view, we constructed single and double knockout mutants for the corresponding genes, loxD and loxL. Lactate-to-acetate con…
Magnetocaloric effect (MCE) in low-cost iron-based binary alloys R 2 Fe 17 (R = Y, Pr) has been investigated by measuring their magnetic properties. The Curie temperature of these alloys is found to be close to room temperature. The specific heat measurement of these materials indicates a second order ferromagnetic/pa…
A new technique for direct measurement and visualization of ion transport in electrochromic materials that will be instrumental in formulating and validating physics-based models of electrochemical reactions is presented (see Figure). Initial experimental and modeling results have been obtained by applying the method…
Suspended single-walled carbon nanotube devices comprised of high-quality electrical contacts and two electrostatic gates per device have been prepared. Compared to nanotubes pinned on substrates, the suspended devices exhibit little hysteresis related to environmental factors and act as cleaner Fabry-Perot interferom…
Mesoporous silica platelets with perpendicular nanochannels (see Figure) have been conveniently prepared by using a ternary cetyltrimethylammonium bromide–sodium dodecylsulfate–Pluronic123 surfactant system as a template and sodium silicate as the silica source. The diameter of the fabricated nanochannels is about 7.0…
A nonaqueous synthetic route for the preparation of a regular crystalline yttria mesostructure is presented. The reaction between yttrium alkoxides and benzyl alcohol results in the formation of a highly ordered lamellar nanocomposite consisting of yttria layers with a confined thickness of about 0.6 nm, separated fro…