Materials Literature
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Photo finish: A polymeric micelle system is formed in aqueous media by electrostatic assembly of an anionic dendrimeric porphyrin and a poly(ethylene glycol)–poly(L-lysine) block copolymer (see picture). The micelles exhibit high photocytotoxicity and stability. The hydrodynamic size (ca. 60 nm) makes this polymeric m…
We evaluate the phase diagram of the "BKS" potential [Phys. Rev. Lett. 64, 1955 (1990)]], a model of silica widely used in molecular dynamics (MD) simulations. We conduct MD simulations of the liquid, and three crystals ( beta -quartz, coesite, and stishovite) over wide ranges of temperature and density, and evaluate…
High-throughput electrochemical methods have been developed for the investigation of Zn1-xCo(x)O films for photoelectrochemical hydrogen production from water. A library of 120 samples containing 27 different compositions (0 <or= x <or= 0.068) was synthesized by automated serial electrochemical deposition. High-throug…
Our research is concerned with the optical properties of covalently bound branched multichromophore systems. The presence of strong intramolecular interactions in dendrimers and other branched macromolecules has stimulated new approaches toward improved energy transfer and light-emitting and enhanced nonlinear optical…
Getting the right mix: Controlling the extent of the charge on the surfaces of carboxy-coated latex nanoparticles enables ultrastable oil-in-water and water-in-oil emulsions to be prepared. Emulsion inversion is simply achieved by changing the pH value (see picture) or salt concentration.
Pichia stipitis NAD(+)-dependent xylitol dehydrogenase (XDH), a medium-chain dehydrogenase/reductase, is one of the key enzymes in ethanol fermentation from xylose. For the construction of an efficient biomass-ethanol conversion system, we focused on the two areas of XDH, 1) change of coenzyme specificity from NAD(+)…
We present an accurate determination of the magic angle conditions at which the sample-orientation induced fine structure variation is eliminated in the core-level electron energy loss spectroscopy of anisotropic systems. Our result paves the way for the application of magic angle electron energy loss spectroscopy (MA…
The synthesis of nanocrystalline powders of zirconia often produces the tetragonal phase, which for coarse‐grained powders is stable only at high temperatures and transforms into the monoclinic form on cooling. This stability reversal has been suggested to be due to differences in the surface energies of the monoclini…
Plated gold: Self-assembly of core/shell nanostructures occurs spontaneously when gold nanoparticles are combined with amphiphilic block copolymers. Polymer cross-linking then topologically fixes the composite nanostructure (see picture). The thickness of the polymer shell, as well as the optical and chemical properti…
Visible-near-IR luminescence spectra of gold MPCs that are similar, irrespective of the number of core atoms (all <2 nm diameter) and different monolayers, are reported. The luminescence can be quantitatively invoked by introducing polar ligands into nonpolar MPC monolayers and by galvanic exchange of metal atoms on t…
Collective dynamic properties in Lennard-Jones crystals are investigated by molecular dynamics simulation. The study is focused on properties such as the dynamic structure factors, the longitudinal and transverse currents and the density of states. The influence on these properties of the structural disorder is analyz…
Algal flora as well as the physicochemical characteristics of rice fields at El-Kharga Oasis was investigated. A total of 99 taxa were identified of which, 23 were Cyanophytes that belong to 11 genera; 19 Chlorophytes belonging to four genera; 52 Bacillariophytes belonging to 15 genera and five Euglenophytes belonging…
The volatile organic compounds (VOCS) produced by 12 algal species belonging to different algal groups were identified. The studied species were grown for two weeks and included: Oscillatoria agardhii (two isolates), Oscillatoria limnetica, Oscillatoria limosa, Microcystis aeruginosa, Chroococcus limneticus, Spirulina…
Abstract Summary: Rigid‐flexible polyethers consisting of terphenyl and aliphatic segments of various lengths along their main chains and disubstituted by dendritic wedges of various generations (G 0 , G 1 , and G 2 ) are examined in their bulk states. Characterization of phase transitions has been performed by means…
It has been found that aspidolite, the Na analogue of phlogopite, has an unusual interlayer structure for micas. The aspidolite investigated is interleaved with phlogopite in a thermally metamorphosed rock. Electron microprobe chemical analyses showed similar compositions for aspidolite and phlogopite except interlaye…
Cuspidine and götzenite were found as accessories in the pegmatitoid facies of venanzite from the Pleistocene lava flow of Pian di Celle. The modal compositions of venanzite and its pegmatitoid facies have been defined through combined XRF and Rietveld quantitative analyses. Cuspidine and götzenite were unambiguousl…
Conjugate polymers assemble into novel superstructures when they are prepared by chemical or electrochemical oxidation of ethylenedioxythiophene, pyrrole or aniline in the presence of ‘anionic’ templates. The ‘anionic’ templates used are the [60]fullerene/anionic calix[8]arene complex, anionic porphyrin J-aggregate, a…
A double minimum six-dimensional potential energy surface (PES) is determined in symmetry coordinates for the most stable rhombic (D2h) B4 isomer in its 1Ag electronic ground state by fitting to energies calculated ab initio. The PES exhibits a barrier to the D4h square structure of 255 cm(-1). The vibrational levels…
We propose to use photodesorption as a noninvasive tool to clean carbon nanotubes from oxygen, offering a clear advantage over thermal and chemical treatments. The detachment of chemisorbed oxygen from atomic vacancies is triggered by a resonant Auger process, initiated by an $\mathrm{O}\phantom{\rule{0.3em}{0ex}}1s\e…
Supramolecular approaches to visual detection, storage, conversion and use of NO X gases are described that deploy calixarenes and their derivatives, such as hemicarcerands and synthetic nanotubes. Polymer-supported calixarene materials for NO X are also introduced. Chemical fixation of NO2/N2O4 is demonstrated throug…