Materials Literature
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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…
The aggregation process of the tetraanionic H2TPPS and the tetracationic CuT4 porphyrins leads, in aqueous solution and in the presence of a suitable chiral template, to the formation of remarkably stable and kinetically inert chiral porphyrin heteroassemblies. These properties enable the aggregates to survive templat…
Gold nanoparticles can be encapsulated by various resorcinarene derivatives and assembled into monolayer films at solvent interfaces. Surface charge plays a critical role in both nanoparticle extraction and self-assembly: the degree of monolayer formation and local two-dimensional (2D) order within the nanoparticle ar…
Abstract Summary: Surface modification induced on poly(ethylene terephthalate) (PET) fibers by cold SF 6 plasma treatment has been investigated systematically as a function of plasma device parameters. The observed wettability modifications of fibers plasma‐treated under different operating conditions were correlated…
Mean-field theory is used to model polyelectrolyte adsorption and the possibility of overcompensation of charged surfaces. For charged surfaces that are also chemically attractive, the overcharging is large in high salt conditions, amounting to 20-40 % of the bare surface charge. However, full charge inversion is not…
Abstract Summary: Poly(arylene ether amine)s were synthesized by a nucleophilic aromatic substitution polycondensation of bis[4‐fluoro‐3‐(trifluoromethyl)phenyl]amine with several bisphenols. Even though the monomer has an electron‐donating diphenylamine moiety, which normally deactivates a nucleophilic aromatic subst…
Grenmarite, a new mineral of the gö tzenite-seidozerite-rosenbuschite group, was found in a syenite pegmatite at the eastern side of the island Vesle Arøya in the Langesundsfjord district, Norway. Grenmarite, ideally (Zr,Mn) 2(Zr,Ti)(Mn,Na) (Na,Ca)4(Si2O 7)2(O,F)4, is the Zr-analogue of seidozerite. It is monoclinic…
This article provides an overview of our recent studies on developing functionalized lipid bilayer membranes, on which enzymatic activity was controlled by a molecular switch through connection of molecular recognition. A water-soluble enzyme, such as lactate dehydrogenase, was immobilized noncovalently on the lipid v…
We study the lattice dynamics of an amorphous∕crystalline∕silicon sandwich model using the environment-dependent interatomic potential (EDIP). We establish a base line by computing the vibrational properties of the component bulk crystal and bulk amorphous structures, which show reasonable agreement with experiment an…