Materials Literature
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Abstract Fluorene‐based polymers containing various fluorinated benzene (fluorobenzene, p ‐difluorobenzene, and tetrafluorobenzene) moieties were synthesized. In addition, perfluorooctylation of poly‐[(9,9‐dioctylfluorene‐2,7‐diyl)‐ co ‐(fluorene‐2,7‐diyl)] was carried out to afford fluorene‐based polymers with perflu…
A series of iron-containing zeolitic materials, prepared by different procedures, have been tested as heterogeneous catalysts for the oxidation of phenolic solutions with hydrogen peroxide under mild conditions. Fe-TS-1 catalysts were synthesized through hydrothermal crystallization of wetness-impregnated Fe 2 O 3 −Ti…
Abstract Triblock copolymers in midblock‐selective solvents can form physical gels. However, at low triblock contents (near the percolation threshold), the bridging of chains between micelles can lead to macrophase separation. Adding a styrene–isoprene diblock to a styrene–isoprene–styrene triblock copolymer in squala…
The study of a homologous series of precursors to bridged polysilsesquioxanes has uncovered striking discontinuities in gelation behavior. An investigation of the chemistry during the early stages of the polymerization has provided a molecular basis for these observations. Monomers containing from one to four bridging…
An electroless plating method was used to deposit Au nanotubules within the pores of track-etched polycarbonate template membranes. The effect of nanotubule inside diameter on rate and selectivity of protein transport was investigated for three proteins: lysozyme (Lys), bovine serum albumin (BSA), and β-lactoglobulin…
Clinically relevant relaxivity enhancement of a magnetic resonance imaging (MRI) contrast agent has been achieved by using prodrug Gd3+ complexes (see picture, DTPA=diethylenetriaminepentaaceto). Enzymatic cleavage of lysine residues from the prodrug exposes a group that has a high affinity to human serum albumin and…
The diboride materials MB2 (M = Mg, Be, Pb, etc.) are discussed on the basis of the 3D Josephson junction array (JJA) model due to Kawabata-Shenoy-Bishop, in terms of the B-B layers in the diborides analogous to the Cu-O ones in the cuprates. We propose a possibility of superconducting materials with the MgB2-type str…
Bis(LeuOH) (1a), bis-(ValOH) (2a) and bis(PhgOH) (5a) (Phg denotes (R)-phenylglycine) oxalyl amides are efficient low molecular weight organic gelators of various organic solvents and their mixtures as well as water, water/DMSO, and water/DMF mixtures. The organisational motifs in aqueous gels are dominated primarily…
The structures of molten MgCl 2 and ZnCl 2 have been modelled using the reverse Monte Carlo method, based on neutron and x-ray diffraction data. We show that, although the structures are similar in terms of two-body correlations (e.g. partial radial distribution functions, average coordination numbers), there are impo…
Relativistic calculations of the parameters β,γ and δ of the photoelectron angular distribution have been carried out using the quadrupole approximation for a number of atoms at photoelectron energies up to 10 000 eV. The calculations have been performed using the Dirac-Fock (DF) atomic model, the exchange interaction…
AIMS: The study investigated the physiology of Amaricoccus kaplicensis to determine whether it could outcompete polyphosphate accumulating bacteria in activated sludge systems removing phosphorus, by preferentially assimilating substrates in the anaerobic stages of these processes. METHODS AND RESULTS: The storage pro…
We analyse the possibilities of elastic matching and effective internal stress relief at the coexistence of polar phases in ferroelectric PbZr 1- x Ti x O 3 compositions close to the morphotropic phase boundary. The important role of the polydomain (twinned) monoclinic phase in this stress relief over wide concentrati…
Abstract A novel, fast, and simple synthetic procedure for polycarbamate/urea dendrimers, based on an AB–CD 2 coupling strategy, is presented. The reactivity difference of the two isocyanate functionalities of the AB building block allows the construction of these dendrimers without the necessity of activation or depr…
We propose that the behaviour of asymmetric binary fluid mixtures with a large class of attractive or repulsive interparticle interactions can be understood by mapping onto effective non-additive hard-sphere models. The latter are best analysed in terms of their underlying depletion potentials which can be exactly sca…
At least three phthalocyanine units can be incorporated into phosphonium salts to give compounds such as 1, following unprecedented exchange reactions between phthalocyanine moieties bound to a palladium center and phenyl groups bound to the coordinated phosphane. Preliminary second-order nonlinear optics studies of t…
Sol−gel-derived manganese oxide can readily be prepared as highly porous, nanostructured materials, including ambigel or aerogel monoliths and thin films supported on conductive, transparent glass. The electrochromic properties of manganese oxide, a mixed electron−cation conductor, provide an independent measure of th…
Complex permittivity and Young's modulus provide relevant information on the role of point defects in the dielectric and mechano-elastic properties of ferroelectric materials. Low-frequency measurements as a function of the temperature performed on Bi 4 Ti 3 O 12 (BIT) have shown that point and dipole defects are froz…
The diameters of HiPco single-wall carbon nanotubes were increased by heat treatments. The original diameters estimated from Raman spectra were in the range of 0.79 to 1.2 nm; they increased with the heat-treatment temperature, reaching about 1.47 nm after 1800 °C heat treatment. Thermogravimetric analyses showed that…
In the growth process of ultrathin films of vanadium oxides on Pd(111), a sequence of novel oxide phases with layer-dependent structures and oscillating oxidation states has been detected experimentally and understood theoretically. These phases are interface mediated and metastable with respect to further oxide growt…
This review focuses on the effect of flow fields on the orientation of block copolymer nanostructures in the melt and in solution. In particular, the alignment induced by strong shear fields or large extensional flows applied to model diblock and triblock copolymers is considered. The distinct orientation states of la…