Materials Literature
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Most polymers solidify into a glassy amorphous state, accompanied by a rapid increase in the viscosity when cooled below the glass transition temperature (T(g)). There is an ongoing debate on whether the T(g) changes with decreasing polymer film thickness and on the origin of the changes. We measured the viscosity of…
publCIF is an application designed for creating, editing and validating crystallographic information files (CIFs) that are used in journal publication. It validates syntax and dictionary-defined data attributes through internal routines, and also provides a web interface to the checkCIF service of the International Un…
Pertsevite-(OH), end-member formula Mg 2 (BO 3 )(OH), is a new mineral found in a ludwigite-kotoite magnesian skarn from the Snezhnoye deposit in Sakha-Yakutia Republic, Russia. The Commission on New Minerals, Nomenclature and Classification, IMA (IMA 2008-060) has approved the mineral and the mineral name. Moreover,…
The Thermoanaerobacter ethanolicus secondary alcohol dehydrogenase I86A mutant is stereospecific for (R)-alcohols instead of (S)-alcohols. Pyramidal crystals grown in the presence of (R)-phenylethanol via the hanging-drop vapour-diffusion method diffracted to 3.2 A resolution at the Canadian Light Source. The crystal…
One-dimensional silver nanorods and nanodisks have been successfully synthesised through a facile method of the polymer template-assisted synthesis. The sample was characterised by a variety of techniques, such as transmission electron microscopy (TEM), scan electron microscopy (SEM) and a UV–vis spectrometer. The as-…
The low-temperature behavior of a natural kalsilite (ideal formula KAlSiO 4 ) with P31c symmetry has been investigated by in situ single-crystal diffraction. A series of intensity data collections and structural refinements have been performed at 298, 250, 200, 150, and 100 K on decreasing temperature, and 175, 225, a…
L-Azetidine-2-carboxylate hydrolase from Pseudomonas sp. strain A2C catalyzes a ring-opening reaction that detoxifies L-azetidine-2-carboxylate, an analogue of L-proline. Recombinant L-azetidine-2-carboxylate hydrolase was overexpressed, purified and crystallized using polyethylene glycol and magnesium acetate as prec…
Gre2p [Genes de respuesta a estres (stress-response gene)] from Saccharomyces cerevisiae is a monomeric enzyme of 342 amino acids with a molecular weight of 38.1 kDa. The enzyme catalyses both the stereospecific reduction of keto compounds and the oxidation of various hydroxy compounds and alcohols by the simultaneous…
ZnO-based transistors were solution-processed using ∼3.6 nm sized ZnO quantum dots (QDs). Spin-deposited ZnO QD layer was annealed to remove QD capping organic molecules and to increase the connectivity of adjacent QDs. The resulting QD layer was highly transparent and crack free without any noticeable pores. 600 °C a…
Cores célèbre: The synthesis of metal nanoparticle-loaded mesoporous silica and their application to enantioselective reactions are described. Dendritic core–multishell polymers are used as stabilizers for Pt nanoparticles and as templates for the synthesis of mesoporous silica. The catalysts can be recycled for at le…
A polyelectrolyte-assisted reprecipitation method is developed to fabricate nanoparticles of highly soluble molecules. The approach is demonstrated by using a zwitterionic diaminodicyanoquinodimethane molecule bearing remote ammonium functionalities with high solubility in water as well as organic solvents. Nanopartic…
Abstract Rare‐earth(III) complexes of the general formula [RE{(Hsal) 3 tren} 2 ](CF 3 SO 3 ) 3 · n CH 3 CN, where RE is Eu ( 1 ), Gd ( 2 ), and Tb ( 3 ), and (Hsal) 3 tren is tris[2‐(salicylideneimino)ethyl]amine, have been synthesized and structurally characterized. X‐ray crystallographic studies show that the rare‐e…
We recorded angle-dependent XANES (AXANES) spectra at the potassium K-edge for three compositionally intermediate polylithionite-siderophyllite trioctahedral 1M-micas using polarized synchrotron radiation. We evaluated the experimental spectra for both their in-plane and out-of-plane component fractions of the electri…
We apply density functional theory with empirical Hubbard U parameter (DFT+U) to study Mn-based molecular magnets. Unlike most previous DFT+U studies, we calibrate U parameters for both metal and ligand atoms using five binuclear manganese complexes as the benchmarks. We note delocalization of the spin density onto ac…
Polarization and electromagnetic properties in artificial multiple helix structures are investigated. It was found that on increasing the numbers of helical backbones, resulting in higher values of chirality index, a unique beam splitting behavior is observed. These split left and right circularly polarized waves prov…
Chabazite-Mg, (Mg 0.67 K 0.52 Ca 0.48 Na 0.08 Sr 0.03 ) Σ1.78 [(Al 3.16 Si 8.89 ) Σ12.05 O 24 ]·9.68H 2 O, is a new zeolite species of the chabazite series, occurring in basalts of the Karikás-tető area of Prága Hill, Veszprém County, Balaton Highland, Transdanubia, West Hungary. It crystallizes as single, colorless r…
The connection between photoluminescence (PL) intermittency and excited-state kinetics is explored for 2',7'-dichlorofluorescein (DCF) isolated in crystals of potassium acid phthalate (KAP) using time-tagged, time-resolved, time-correlated single-photon counting (T3R-TCSPC). In this technique, PL intermittency or "bli…
Fünffach verzwillingte, Seestern-förmige Rh-Nanokristalle mit fünf Armen (siehe TEM-Bild) wurden in hohen Ausbeuten ausgehend von [{Rh(CF3COO)2}2] synthetisiert. Die Synthese vermeidet oxidative Ätzvorgänge, und die frisch hergestellten Rh-Nanokristalle eignen sich sehr gut als SERS-Substrate.
Abstract: The present work reports about an experimental study investigatingthe influence of air convection and of ambient temperature around a half-floatingzone on the transition behavior from steady to oscillatory flow, i.e. the influenceon the critical Marangoni number (Ma cr ). Increase of heat loss from the free sur-…
In a recent Letter [J. K. Dong et al., Phys. Rev. Lett. 104, 087005 (2010)], Dong \textit{et al}. have observed a $T^{1.5}$ dependence of resistivity $\rho$ in KFe$_2$As$_2$ at the upper critical field $B_{c2}$ = 5 T parallel to the c axis and have suggested the existence of a field-induced quantum critical point (QCP…