Materials Literature
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From the leaves of Stenochlaena palustris five new O-acylated flavonol glycosides, stenopalustrosides A-E (1-5), have been isolated along with five known compounds, kaempferol 3-O-(3' '-O-E-p-coumaroyl)-(6' '-O-E-feruloyl)-beta-D-glucopyranoside (6), kaempferol 3-O-(3' ',6' '-di-O-E-p-coumaroyl)-beta-D-glucopyranoside…
Calculations of the A_1 phonon frequency in photoexcited tellurium are presented. The phonon frequency as a function of photoexcited carrier density and phonon amplitude is determined. Recent pump probe experiments are interpreted in the light of these calculatons. It is proposed that, in conjunction with measurements…
The microstructure of Bombyx mori silk fibers before and after degumming was examined by transmission electron microscopy (TEM), selected area electron diffraction (SAED), wide-angle X-ray scattering (WAXS), and low-voltage high-resolution scanning electron microscopy (LVHRSEM). LVHRSEM micrographs of the neat cocoon…
A novel two-step silica-coating process, sol−gel followed by dense liquid coatings, is described. The maghemite surfaces coated with silica, using the two-step process, are characterized by X-ray photoelectron spectroscopy, electrokinetics, leaching test, and magnetization measurement. Compared with the single-step so…
The synthesis and characterization of palladium-grafted mesoporous MCM-41 material, designated Pd-TMS11, are described. The material is investigated for carbon−carbon coupling reactions (Heck catalysis) with activated and nonactivated aryl substrates. For the preparation of the new catalyst, a volatile organometallic…
Experimental measurements, interpreted with mean field theories, provide quantitative understanding of the stability of colloidal particles coated with a highly asymmetric diblock copolymer. Adsorption of poly((dimethylamino)ethyl methacrylate)/poly( n -butyl methacrylate) onto colloidal silica particles from 2-propan…
Fine-line electronic absorption and fluorescence spectra of porphycene and 2,7,12,17-tetra- n -propylporphycene have been measured in low-temperature nitrogen, argon, krypton, and xenon matrices. A well-resolved emission spectrum of porphycene was also obtained in an isotropic glassy matrix using the fluorescence line…
The synthesis and liquid-crystalline properties of tetracatenar covalent and H-bonded bis-ferrocene derivatives 1 and 2, respectively, are reported. Both compounds gave rise to enantiotropic columnar liquid-crystalline behavior with a hexagonal molecular organization. To explore the possibility to obtain also calamiti…
Two series of linearly conjugated hybrid materials, consisting of (E)-1,2-diethynylethene (DEE; hex-3-ene-1,5-diyne) and ZnII porphyrin components, were prepared by Pd0-catalyzed cross-coupling reactions. In one series, one or two DEE substituents were introduced into the meso-positions of the ZnII porphyrins, leading…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTC60 Mediated Aggregation of Gold NanoparticlesMathias Brust, Christopher J. Kiely, Donald Bethell, and David J. SchiffrinView Author Information Department of Chemistry The University of Liverpool Liverpool L69 7ZD, United Kingdom Department of Materials Science and En…
Liquid−liquid equilibria for the ternary systems water + acetic acid + ethyl acetate and water + acetic acid + isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) were measured over the temperature range (283 to 313) K. The results were used to estimate the interaction parameters between each of the three compounds of the…
N -(11-Trimethylammonioundecanoyl)- O, O ‘ -didodecyl tripeptide bromides and N -(11-trimethylammonioundecanyl)- O -dodecyl tripeptide bromides formed a parallel β-sheet structure when they aggregated in water and in CCl 4 . The parallel β-sheet was distinguished from the antiparallel counterpart by Fourier transform…
We have developed scanning near-field microwave microscopes which can image electrodynamic properties of superconducting materials on length scales down to about 2 $μ$m. The microscopes are capable of quantitative imaging of sheet resistance of thin films, and surface topography. We demonstrate the utility of the micr…
Using molecular dynamics (MD) with classical interaction potentials we present calculations of thermal conductivity and heat transport in crystals and glasses. Inducing shock waves and heat pulses into the systems we study the spreading of energy and temperature over the configurations. Phonon decay is investigated by…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
In this study, we utilized the substitution geometry of triethoxysilyl groups about an organic bridging group to control the outcome of the sol−gel polymerization process. The substitution geometry of two triethoxysilyl groups about a carbon−carbon double bond was determined to have a profound effect on sol−gel polyme…
The sonochemical irradiation of Fe(CO) 5 solution in Decalin has been carried out with and without an external magnetic field. Direct TEM measurements reveal that the sample obtained without a magnetic field consists of spongelike particles with a mean size of about 25 nm, whereas the sample synthesized in a 7 kG magn…
BACKGROUND: Graft thrombosis and intimal hyperplasia represent the major causes of graft failure. Heparin has been shown to have a beneficial effect on long-term patency and on prevention of intimal hyperplasia. Thus, the purpose of the present study was to evaluate the effect of heparin coating on patency rate and in…
Polyhydroxyalkanoate (PHA) is a family of polymers composed primarily of R-3-hydroxyalkanoic acids. These polymers have properties of biodegradable thermoplastics and elastomers. Medium-chain-length PHAs (MCL-PHAs) are synthesized in bacteria by using intermediates of the beta-oxidation of alkanoic acids. To assess th…
Mesoporous MCM-41 silica hierarchical structures consisting of a high yield (∼98%) of uniform-sized hollow spheres of diameter 5.0 ± 1.0 μm have been obtained. The nanochannels on the shell are in latitude direction and the inside of the micron spheres has intricate pillar structures producing structures of various to…