Materials Literature
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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…
Thermodynamics provides a transparent definition of the free energy of density functional theory (DFT), and of its derivatives - the potentials, at finite temperatures T. By taking the T to 0 limit, it is shown here that both DFT and spin-dependent DFT (for ground states) suffer from precisely the same benign ambiguit…
We discuss pinning properties of MgB2 thin films grown by pulsed-laser deposition (PLD) and by electron-beam (EB) evaporation. Two mechanisms are identified that contribute most effectively to the pinning of vortices in randomly oriented films. The EB process produces low defected crystallites with small grain size pr…
We use Schwinger boson mean field theory to study the antiferromagnetic spin-1/2 Heisenberg model on an anisotropic triangular lattice in the presence of a uniform external magnetic field. We calculate the field dependence of the spin incommensurability in the ordered spin spiral phase, and compare the results to the…
The degree of circular polarization ($\wp$) of the non-linear emission in semiconductor microcavities is controlled by changing the exciton-cavity detuning. The polariton relaxation towards \textbf{K} $\sim 0$ cavity-like states is governed by final-state stimulated scattering. The helicity of the emission is selected…
Fundamentally new families of carbon single walled nanotubes are proposed. These nanotubes, called graphynes, result from the elongation of covalent interconnections of graphite-based nanotubes by the introduction of yne groups. Similarly to ordinary nanotubes, arm-chair, zig-zag, and chiral graphyne nanotubes are pos…
This paper presents a method that combines activity coefficient models with Hand's equation for tie lines. The proposed method calculates solute distribution in liquid-liquid ternary systems. The combination improves the calculated solute distributions using activity coefficient models while Hand's equation gives a go…
Several structural levels of plastic deformation (the superdefect zone, the quasidestructured region, the region with a high dislocation density, the peripheral zone and the region of elastic deformation) have been distinguished around microindentations of various crystal types. The real structure of the deformed zone…