Materials Literature
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The chiral organocatalyst bisflavin 1 catalyzes the asymmetric Baeyer–Villiger reaction of cyclobutanones with H2O2 (see scheme). The corresponding lactones are obtained with up to 74 % ee.
A calculation of the inelastic scattering rate of Xe atoms on Cu(111) is presented. We focus in the regimes of low and intermediate velocities, where the energy loss is mainly associated to the excitation electron-hole pairs in the substrate. We consider trajectories parallel to the surface and restrict ourselves to t…
Highly ordered Prussian blue nanowire arrays with diameters of about 50 nm and lengths up to 4μm have been fabricated for the first time by an electrodepositing technology with two-step anodizing anodic aluminum oxide films. X-ray diffraction and transmission electron microscopy measurement results show that the Pruss…
A novel chemical functionalization method for multiwalled carbon nanotubes (MWNTs), through an oxidation and silanization process, is presented. The method allows us to have different organo-functional groups attached to the MWNTs, which improves their chemical compatibility with specific polymers for producing new na…
Two types of noncovalent bonding interactions are present in protein structures, specific and nonspecific. Nonspecific interactions are mostly hydrophobic and van der Waals. Specific interactions are largely electrostatic. While the hydrophobic effect is the major driving force in protein folding, electrostatic intera…
Controllable reactivity of Cd precursors in the growth of CdS nanocrystals was achieved by varying the concentration of stabilizing ligand with a noncoordinating solvent. Such tunable reactivity is critical for developing the synthesis of semiconductor nanocrystals to the level of that of CdSe nanocrystals. The high q…
The atomic structure of various 1/1– 1/1– 1/1 approximants has been extensively studied in the last decade to bridge the gap to that of the corresponding quasicrystal. Reliable information about electronic states in their valence bands has also been accumulated by using the atomic structure determined theoretically an…
The stereochemistry in solution of spirocyclophosphazenes 1–3 containing 2,2′-dioxybiphenyl groups, tris(2,2′-dioxybiphenyl)cyclotriphosphazene [N3P3(O2C12H8)3] (1) and the chloro derivatives [N3P3Cl2(O2C12H8)2] (2) and [N3P3Cl4(O2C12H8)] (3), was studied using high field 1H, 13C and 31P NMR spectroscopy (variable tem…
Single-crystal La0.5Sr0.5MnO3 nanowires were successfully synthesized by a hydrothermal method at 553 K. This reaction temperature is much lower than that of traditional methods. The nanowires have a cubic perovskite structure without any other secondary or impurity phase. Typical lengths of the nanowires are in the r…
A model is proposed to account for Kerr-like nonlinearity induced by femtosecond pulses via terahertz generation and electro-optical effect. This phenomenon, so far overlooked, is evidenced in a zinc blende single crystal with a heterodyne optical Kerr effect setup. The spectral evolution of this phenomenon as well as…
Abstract The electrochemical behaviour of three fluoro‐substituted aniline monomers, 2‐fluoroaniline (2FAN), 3‐fluoroaniline (3FAN) and 4‐fluoroaniline (4FAN), was investigated in aqueous acidic and organic media by means of cyclic voltammetry (CV) studies. Constant potential electrolysis (CPE) of the monomers in acet…
Abstract The use of recycled rubber including ground scrap vulcanizates in rubber compounds was studied. When ground rubber was incorporated into rubber compounds, the physical properties, especially the tensile strength, were deteriorated compared to the virgin rubber compound. Also, incorporating ground rubber cause…
By employment of a strategy of post-transfer modification, precursor Langmuir−Blodgett (LB) films of poly( tert -butyl methacrylate) (P t BMA) and poly( tert -butylacrylate) (P t BA) can be converted to poly(methacrylic acid) (PMAA) and poly(acrylic acid) (PAA) through acid-catalyzed hydrolysis in the gas phase. X-ray…
Star-shaped polymers bearing three, four, and six poly(L-lactide) (PLA) arms have been prepared starting from trimethylolpropane (3 OH), di(trimethylolpropane) (4 OH), and dipentaerithritol (6 OH) and L,L-dilactide (LA) monomers. Initiator/catalyst tin octoate was used (bulk polymerization, 120 °C). In liquid chromato…
We investigate a Maxwell model of inelastic granular mixture under the influence of a stochastic driving and obtain its steady-state properties in the context of classical kinetic theory. The model is studied analytically by computing the moments up to the eighth order and approximating the distributions by means of a…
Abstract In this paper, water‐dispersible polyurethanes based on isophorone diisocyanate and polytetramethylene glycol were synthesized, and their thermal degradation behavior under nitrogen and air was studied by thermogravimetric (TG) analysis. The influence of NCO/OH ratio and functional group concentration was dis…
H-ZSM-5 loaded with silver cations (Ag/H-ZSM-5) catalyzed conversion of CH4 to higher hydrocarbons such as C3H6 in the presence of C2H4. The effect of the reaction parameters, such as reaction temperature, were examined. The maximum conversion of methane was 13.2 mol% at 673 K. The reaction of C2H4 with 13C-labelled m…
The mesopores in SBA-15 are curved on a mesoscopic length scale and even more so in the case of modified SBA-15, which implies that using the particle size of these types of materials in diffusion studies may strongly underestimate the path length relevant for intraparticle diffusion.
Cholic acid was coupled to an alkyl tail via three different connecting groups, amide, urea, and ester group, and the gelation capabilities of these compounds in different solvents were compared. Both amide and urea derivatives form one-component gels. They give transparent and stable gels in aromatic solvents through…
The adsorptive removal of periodic spikes of the trace synthetic organic chemicals (SOCs) simazine and asulam from water containing natural organic matter (NOM) was studied in pilot-scale granular activated carbon (GAC) adsorbers over a period of nearly 3 years. The SOC removal percentage obtained at any preloading ti…