Materials Literature
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Natural amino donation: A PLP-dependent aminotransferase PctV, encoded in the pactamycin biosynthetic gene cluster, was found to catalyze the formation of 3-aminobenzoate from 3-dehydroshikimate with L-glutamate as the amino donor. The PctV reaction comprises a transamination and two dehydration reactions. This is the…
The macroporous materials were prepared from the transformation of cuttlebone as biotemplates under hydrothermal reactions and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric/differential thermal analyses (TG-DTA), and scanning electron microscopy (SEM). Cell…
ABSTRACT A series of highly sulfonated, ether‐containing polybenzimidazoles (SOPBI) with controlled sulfonation degrees were synthesized from various stoichiometric ratio mixtures of sodium 6,6'‐oxybis(3‐carboxybenzenesulfonate) (SODBA), 4,4'‐oxydibenzoic acid (ODBA), and 3,3'‐diaminobenzidine (DAB) by solution copoly…
In this paper the bending behavior of a uniform distribution (UD) and a functionally graded carbon-nanotube-reinforced composite (FG-CNTRC) cylindrical panel embedded in piezoelectric layers is investigated. The hybrid cylindrical panel has simply supported boundary conditions and is subjected to mechanical load and e…
The synthesis, NMR properties and preliminary polarization tests on protonated and perdeuterated forms of α-trimethylglutamine (NMe3Gln), α-trimethylglutamate (NMe3Glu) and ε-trimethyllysine (NMe3Lys) are reported. The (15)N-permethylated, perdeuterated amino acids display very long (15)N-T1 values, ranging between 19…
Crossing the line: A pH-induced "crossover" in 3D shapes of supramolecular constructs derived from trans(NH3)2Pt(II), [Pd(II)(en)], and the purine model nucleobase 9-methylhypoxanthine (see figure) is reported in which [Pd(en)(H2O)](2+) and [Pd(en)(OH)](+) are the decisive players (en = ethylenediamine).
Combinations of tetramercaptotetrathiacalix[4]arene pyridyl-appended positional isomers with HgCl2 lead to the formation of neutral coordination networks with their dimensionality imposed by the position of the N atom on the pyridyl group.
The synthesis, characterization, and photophysical and photovoltaic properties of two anthracene-containing wide-band-gap donor and acceptor (D-A) alternating conjugated polymers (P1 and P2) are described. These two polymers absorb in the range of 300-600 nm with a band gap of about 2.12 eV. Polymer solar cells with P…
Organosulfur compounds are known to poison metallic nanoparticle catalysts. Herein NaBH 4 is shown to desorb and desulfurize 2-mercaptobenzimidazole (2-MBI) and 6-thioguanine (6-TG) adsorbed on 10, 15, and 50 nm diameter gold nanoparticles (AuNPs). The desulfurization rates decrease significantly with increasing AuNP…
Organic Solar CellsAt the Interface O rganic photovoltaics (OPVs), whose active layers are polymers, small molecules, and hybrids of these material sets, have recently shown the greatest rate of improvement in power conversion efficiency relative to all other PV platforms, at least at the research cell level.Their in…
Using Brownian dynamics simulation, we determine chain dimensions in an entangled polymer melt undergoing startup shear at a rate lower than the reciprocal of the Rouse time yet higher than the reciprocal reptation time. Here the tube model expects negligible chain stretching. In contrast, our simulation shows the def…
Dielectric functions and anisotropic thin film properties such as electronic conductivity or molecular orientations are of high technological importance for engineering efficient optical, electronic, and sensing devices. This work demonstrates for the first time how full-scale polarization-dependent Fourier-transform…
Abstract Synthetic polymers containing metals and metal centers have experienced rapid growth in the last two decades. Metal‐containing polymers have an unprecedented role to play in modern high‐tech applications including nanomanufacturing, sensing, separation and catalysis. Advancement in synthetic strategies for ma…
Metallische Verunreinigungen: Graphenoxidnanobänder (GONRs) werden üblicherweise ausgehend von Kohlenstoffnanoröhren (CNTs) synthetisiert (siehe Bild). CNTs enthalten jedoch auch nach Reinigung signifikante Mengen metallischer Verunreinigungen, die nach dem oxidativen Aufrollen zur Bildung der GONRs bestehen bleiben u…
We have tested modified hydrolysis method for the preparation of α-Fe 2 O 3 nanoparticles. The particles after synthesis were applied for a series of physicochemical techniques. Iron chloride was used as a precursor material. The particle size distribution was determined using zeta sizer and scanning electron microsco…
Three-dimensional inorganic nanostructured thin films with slanted columnar morphologies are functionalized with organic polymer brushes to fabricate a nanohybrid functional material. Nanostructured thin films are fabricated by glancing angle deposition of silicon onto silicon or gold to produce slanted columnar thin…
A class of uranyl peroxide clusters was discovered before as nanometer-sized ions that form spontaneously in aqueous solutions. The uranyl(VI) cluster investigated here is approximately 2 nm in diameter, contains 24 uranyl moieties, and 12 pyrophosphate units. NMR spectroscopy shows that the ion has two distinct forms…
In the perspective of a sustainable energy economy, CO 2 reduction is attracting increasing attention as a key step toward the synthesis of fuels and valuable chemicals. A possible strategy to develop novel conversion catalysts consists in mimicking reaction centers available in nature, such as those in enzymes in whi…
Abstract This study reports a reversible oxygen reduction–oxygen evolution reaction (ORR–OER) that uses a solvate ionic liquid, [Li(triglyme)1][NTf2], as an electrolyte for a rechargeable Li–air (O2) battery. Significantly, it was found that the reversibility and capacity retention for ORR–OER in the solvate ionic liq…
We investigate properties of exotic pairing states in a three-dimensional Fermi gas with three-dimensional spin-orbit coupling and an effective Zeeman field. The interplay of spin-orbit coupling, effective Zeeman field, and pairing can lead to first-order phase transitions between different phases, and to interesting…