Materials Literature
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Abstract The recovery properties of dry and water saturated polyamide 6 (PA6) and its copolymer PA6/66 (ratio 4:1 by mol) were studied at elevated temperatures above the glass‐transition temperature in uniaxial tensile tests. The data yield critical points along the true stress–strain curves at which the differential…
Abstract We performed temperature‐dependent Raman scattering studies on K 0.2 Na 0.8 NbO 3 ceramics and compared the results with those for NaNbO 3 . The wavenumbers associated with NbO 6 vibrations suggest the existence of two phase transitions, as occurs with pure NaNbO 3 ceramics. Although the disorder on the Na/K…
Decarboxylation of orotidine 5'-monophosphate (Omp) to uridine 5'-monophosphate by orotidine 5'-monophosphate decarboxylase (ODCase) is currently the object of vivid debate. Here, we clarify its enzymatic activity with long time scale classical molecular dynamics and hybrid ab initio Car-Parrinello/molecular mechanics…
Elementary reaction steps and barriers for thiophene hydrodesulfurization (HDS) on a Ti 8 C 12 nanoparticle were investigated using density functional theory. It is found that despite its high carbon concentration Ti 8 C 12 displays a superior catalytic potential for hydrodesulfurization. Compared to the industrial ca…
Following the discovery of spinel structured silicon and germanium nitrides, we investigated the possibility of intermediate compositions or even solid solution in that new system. The multianvil syntheses were performed at 23 GPa and above 2000 °C. The synthesis products from a wide range of mixtures of low-pressure…
Self-healing is the spontaneous extinction of a local electrical arc due to the destruction of the electrodes during the process. It occurs in capacitors made of metallized films of plastics with a thin layer of metal. A theoretical model of the self-healing phenomenon has been elaborated from a previous investigation…
The high-pressure phase of magnetite, $h\text{\ensuremath{-}}{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$, has been studied by M\"ossbauer spectroscopy, and electrical conductivity to pressure of $140\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and in the $5--573\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ temperature range. M\"ossbauer…
Stable (c) and metastable (h) forms of Mg 2 Sn were prepared as crystallized phases by ball-milling of elemental powders. Through in situ X-ray diffraction measurements, we deduced the reactivity mechanisms of c-Mg 2 Sn toward lithium. It entails first a monophasic insertion of about one lithium per formula unit into…
We describe a simplified method for the synthesis of gold nanorods on surfaces. Gold colloid seeds were deposited by electrostatic attraction onto silicon wafers and grown in a HAuCl 4 solution by surfactant-assisted, seed-mediated synthesis. Microscopic analysis of the nanoparticle ensemble allowed direct observation…
Benzene- d 6 confined in a mesoscopically organized, controlled, porous-glass mesocellular foam (MCF), with a pore diameter of 30 nm, is studied by low-temperature solid-state 2 H nuclear magnetic resonance ( 2 H NMR) spectroscopy in the temperature range of 90−180 K. The resulting spectra are compared to bulk benzene…
Nanostructured Fe-ZSM-5: Structures and reactivities of an Fe-exchanged ZSM-5 zeolite (see picture, the blue and red spheres represent Fe and O atoms, respectively) for decomposition of nitrous oxide and oxidation of methane to methanol were investigated using density functional theory calculations and a two-layered O…
The multiple daily administration of venlafaxine, a novel third-generation antidepressant, was reduced based on polyamidoamine and polyethylene glycol (PEG)-containing semi-interpenetrating network (IPN), respectively. Venlafaxine was covalently linked to water-soluble G2.5 anionic polyamidoamine dendrimer via a hydro…
Periodic mesoporous organosilicas (PMOs) were prepared by polymerizing phenylene-bridged silsesquioxane precursors containing an incremental increase in methylene spacers [1,4-(CH 2 ) n C 6 H 4 ( n = 0−2)] in combination with polyoxyethylene(10) cetyl ether (Brij 56) oligomers as structure-directing species under acid…
High-temperature second-harmonic-generation, x-ray powder diffraction, dielectric, differential scanning calorimetry, and structural data are presented to show that ${\mathrm{Sr}}_{9}\mathrm{In}{(\mathrm{P}{\mathrm{O}}_{4})}_{7}$ exhibits an antiferroelectric (AFE) phase transition of the second order at $773\ifmmode\…
The modification and dispersion of nanosilica particles were investigated by Fourier transform infrared spectroscopy (FTIR), 29Si CP MAS NMR, thermal gravimetric analysis (TGA), Raman spectroscopy, particle size analysis, transmission electron microscopy (TEM), and dynamic mechanical analysis (DMA) using methacryloxyp…
Abstract The micro/nano structural evolution of two different types of ultra‐high‐performance polyamide (PA) 66 fibres, before and after tensile fatigue loading and failure, was studied using Raman spectroscopy. The nanostructure of these PA fibres consists of amorphous and crystalline domains. Two probes were conside…
This paper describes a new method for incorporating various amounts of ruthenium species (Ru) into hybrid periodic mesoporous organosilicas (HPMO). The effects that the Si : Ru ratio has on the Ru-containing HPMO materials (Ru-HPMO) were determined by powder X-ray diffraction (XRD), N2 sorption, transmission electron…
A new spiropyran (SP2) with the stable merocyanine form (MC2) both in solution and in the solid state at room temperature was designed and synthesized. The stability of MC2 is believed to be due to the electron-withdrawing effect of both the quinoline and the trifluoromethyl groups. (1)H NMR spectra indicate that the…
Intramolecular cross-linking of peptides by the light-sensitive compound diiodoacetamideazobenzene has been shown to permit reversible photocontrol of the helix-coil transition. Cross-linking between Cys residues spaced at i and i + 7 positions with the trans form of the linker was found to produce a decreased helix c…
One of the factors responsible for the high stability of water-in-bitumen or water-in-crude oil emulsions is the presence of a complex adsorbed layer of material at the water−oil interface. However, except for its role as a steric barrier, little is known about the nature and activity of this layer. Studying a macrosc…