Materials Literature
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With series production of aluminium foams according to the Fraunhofer process a reality, further improvement of structural homogeneity has gained interest. Since this characteristic is strongly influenced by blowing agent decomposition, means to adapt the latter have been investigated: The paper concentrates on therma…
The existence of localized vibrations at low frequencies in glasses and the notion and the properties of quasilocalized vibrations (QLVs) in glasses have been debated in the recent literature. By clarifying the main features of the QLVs and of the low-frequency vibration in model systems (a defect lattice and a Lennar…
Solid-state 13 C NMR measurements were made for the B2 and B4 phases of the achiral banana-shaped molecule, P-14-O-PIMB, which exhibits a direct transformation from the B2 phase to the B4 phase. In both phases, an NMR resonance signal assigned to carbonyl carbons of the ester linkages appears as doublet peaks, showing…
Abstract The control of interfacial charge transfer is central to the design of photovoltaic devices. This charge transfer is strongly dependent upon the local chemical environment at each interface. In this paper we report a methodology for the fabrication of a novel nanostructured multicomponent film, employing a du…
Abstract The epoxidation of methyl linoleate was examined using transition metal complexes as catalysts. With a catalytic amount of methyltrioxorhenium (4 mol%) and pyridine, methyl linoleate was completely epoxidized by aqueous H 2 O 2 within 4 h. Longer reaction times (6 h) were needed with 1 mol% catalyst loading.…
Comprehensive 2-D GC provides high-performance separations in terms of selectivity, sensitivity, speed, and structure.
Abstract Transition metal catalysts such as Pd, Pt, Ru, and Rh supported on carbon, silica and alumina have been examined for the hydrogenation of nitrobenzene (NB) in supercritical carbon dioxide (scCO 2 ) and in ethanol. The order of hydrogenation activity is Pt>Pd>Ru, Rh in scCO 2 and in ethanol. The effectiv…
The atmospheric corrosion of copper has been investigated after deposition of sodium chloride (NaCl) particles and 10 days of subsequent exposure to clean, humidified air below, near, and above the point of deliquescence of NaCl (at around 75% relative humidity [RH]). Microgravimetry, Fourier transform infrared (FTIR)…
SiC foams were fabricated by gelcasting with a commercially available powder and agar as gelling agent. Ceramic foams processed by gel casting have dense struts and are therefore mechanically stronger than foams produced by the conventional poly‐urethane replica method. First, special attention was given to the prepar…
Unexpected failure of Nicalon/SiC composites is observed under low stresses at intermediate temperatures (600°–800°C) in air. This effect has been designated as a nuisance by a few authors. The lifetime of SiC (Nicalon) multifilament tows is investigated in static fatigue in air at temperatures in the range of 600°–70…
The thermal shock fatigue resistance of cordierite and SiC filters with a mullite filtration layer was evaluated under simulated reverse cleaning conditions. O‐ring specimens were thermally shocked by cyclically blowing cold air outward through them while they were exposed to high‐temperature flue gas. The calculated…
ZnO thin films have been deposited by chemical bath deposition (CBD-ZnO). The deposition conditions, i.e. the pH and the temperature of the bath, have been adjusted to achieve the deposition of porous, but adherent, thin films. After annealing in air half an hour at 300 °C ZnO films crystallized in the hexagonal struc…
A new method for transforming wood structures into ceramic by carbothermal reduction of silica and carbonized wood has been developed. Application of this technique allows the preservation of wood microstructures in the ceramic state and the conversion of wood components without constraints in component size. The chos…
Abstract Summary: The use of hyperbranched polymers (HBP) with hydroxy functionality as modifiers for poly( L ‐lactic acid) (PLLA)‐flax fiber composites is presented. HBP concentrations were varied from 0 to 50% v/v and the static and dynamic tensile properties were investigated along with interlaminar fracture toughn…
Abstract Summary: A phenolic group containing hyperbranched polyester (HBP) was synthesized and employed as chain transfer agent in cationic photopolymerization of a biscycloaliphatic epoxy monomer ( CE ). The epoxy group conversion increases by increasing the amount of HBP in the photocurable resin, due to a chain tr…
Nimbidin is a mixture of tetranortriterpenes and is the major active principle of the seed oil of Azadirachta indica A. Juss (Meliaceae) possessing potent antiinflammatory and antiarthritic activities. The present study revealed that nimbidin significantly inhibited some of the functions of macrophages and neutrophils…
The whole polyhydroxyalkanoate (PHA) synthesis gene locus of Pseudomonas stutzeri strain 1317 containing PHA synthase genes phaC1Ps, phaC2Ps and PHA depolymerase gene phaZPs was cloned using a PCR cloning strategy. The sequence analysis results of the phaC1Ps, phaC2Ps and phaZPs showed high homology to the correspondi…
Abstract Three different configurations of Au‐nanoparticle/CdS‐nanoparticle arrays are organized on Au/quartz electrodes for enhanced photocurrent generation. In one configuration, Au‐nanoparticles are covalently linked to the electrode and the CdS‐nanoparticles are covalently linked to the bare Au‐nanoparticle assemb…
This paper reports the development of a mathematical model of moisture and heat transfer coupled with phase change materials (PCM) in porous textiles. On the basis of a finite volume difference scheme, the thermal buffering effect of PCM is simulated. The distributions of temperature and moisture concentration in poro…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Hideki Yamane, Kosuke Sasai, Masayuki Takano, Masaoki Takahashi; Poly(D-lactic acid) as a rheolog…