Materials Literature
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Double perovskites are of interest due to their diverse properties that are of potential use in technological applications. In order to determine the effect of Co(II) in the double perovskite structure in the absence of other paramagnetic species, mixed valency or mis-site disorder, we have studied the ordered perovsk…
Nanocrystalline lead zirconate titanate (PZT) powder with an average particle size between 70 and 110 nm was synthesized using the citrate nitrate (C/N) autocombustion method. Phase-pure perovskite PZT nanoparticles were characterized by XRD, BET surface area, DSC/TGA, and TEM analysis. The crystallite size of the PZT…
A gallium phthalocyanine dimer with a direct gallium–gallium bond, [tBu4PcGa]2·2dioxane (2), has been synthesized and characterized by Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, UV/Vis, IR, NMR and MALDI-MS. By EXAFS the gallium–gallium distance in 2 was found to be 2.46 Å. Dimer 2 exhibits reverse…
We report a cumulative study of lithium oxide in its normal as well as superionic phase using both lattice dynamical and molecular dynamical calculations. Molecular dynamics simulations have been carried out to study the fast ion phase and the diffusion behavior of lithium and oxygen ions. The results obtained for the…
Polypropylene nonwoven fabric was surface-activated by high-density oxygen microwave plasma, followed by graft copolymerization with acrylic acid (AAc) and then coupling with chitosan molecules. The pAAc-grafted surface containing C=O in carboxylic acid exhibited a hydrophilic character capable of promoting water abso…
Mit bloßem Auge lässt sich die Farbänderung erkennen, die in einer Polymermatrix auftritt, wenn das gezeigte bistabile Rotaxan zwischen den für den Grundzustand (grün) und den metastabilen Zustand (rot) stehenden Cokonformeren wechselt. Damit ist nicht nur eine elektrochrome Baueinheit in Reichweite, sondern es schein…
Abstract Coalescence of droplets in flow through capillary dies and in the filling of strip molds was investigated using experiments and time‐scale analysis. The time scales of droplet approach, droplet‐droplet interactions, and fluid drainage were compared with the time scales of flow in order to predict the extent o…
Abstract In this study, hydrogenated acrylonitrile butadiene rubber (HNBR, ZETPOL‐2010L) and nitrile butadiene rubber (NBR, NIPOL‐DN4555) were blended at different ratios in a Haake melt blender at 130°C. The HNBR and the NBR were of very similar acrylonitrile content and Mooney viscosity. The melt miscibility and sol…
Ordered homogeneous arrays of copper (II) oxide nanotubes have been fabricated through an MOCVD template route. SEM images of the CuO nanotubes, after removing the template, indicate the formation of well-ordered nanotube arrays. There is evidence that nanotubes are opened on both sides.
The Michael-type addition of aliphatic (co)polyesters onto gamma-acryloyloxy epsilon-caprolactone units is a very straightforward technique of functionalization and grafting, which is tolerant to a variety of functional groups and does not require intermediate protection/deprotection steps.
The synthesis of a new class of sulfuric acid-functionalized ethane-bridged, mesoporous hybrid organosilicas is reported where the propylsulfonic groups attached with ethane-bridged silica exhibited reasonable catalytic activity in esterification of acetic acid with ethanol as well as the hydrolysis of cyclohexylaceta…
Spontaneous deposition of Pd onto catalytic grade Pt nanoparticles has been shown to yield Pt/Pd catalysts having enhanced catalytic activity toward formic acid oxidation, when compared to pure Pt- and Pd-black. Here, we report the results of electrochemical nuclear magnetic resonance (EC NMR) and electrochemical meas…
The adsorption of oxalate on a model aluminum oxide, corundum (alpha-Al2O3), has been examined over a broad range of oxalate concentrations (0.125-25.0 mM) and pH conditions (2-10). In situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) measurements indicate that at low to intermediate concentratio…
The homogeneous, gas-phase oxidative thermal degradation of 2-chlorophenol was studied in a 1 cm i.d., fused silica flow reactor at a concentration of 88 ppm, reaction time of 2.0 s, over a temperature range of 300 to 1000 °C. Observed products in order of yield were as follows: 4,6-dichlorodibenzofuran (4,6-DCDF) > d…
We report the observation of the homogenous nucleation of crystals in a dense layer of steel spheres confined between two horizontal plates vibrated vertically. Above a critical vibration amplitude, two-layer crystals with square symmetry were found to coexist in steady state with a surrounding granular liquid. By ana…
Metallocalixarenes were grafted onto silica using a surface organometallic approach and shown to be active and selective catalysts for epoxidation of alkenes using organic hydroperoxides. Calixarene-Ti(IV) precursors were anchored at surface densities from 0.1 to near-monolayer coverages (0.025-0.25 calixarene nm(-2))…
Mass production of CdS nanobelts is successfully achieved by a simple thermal evaporation of CdS powders under controlled conditions in the presence of Au catalysts. The as-synthesized CdS nanobelts are single-crystalline with wurtzite structure, usually several hundred nanometers in width, tens of micrometers in leng…
The temperature-dependent self-assembly of the single-chain bolaamphiphile dotriacontan-1,1'-diyl-bis[2-(trimethylammonio)ethyl phosphate] (PC-C32-PC) was investigated by transmission electron microscopy (TEM), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), X-ray scattering,…
We develop realistic models of Si nanocrystals embedded in a-SiO2 using a Monte Carlo approach. The interface structure and its energetics are studied as a function of the nanocrystal size. We find that the low-energy geometries at the interface are Si-O-Si bridge bonds. Remarkably, their fraction strongly declines as…
Oxygen vacancies in metal oxides are known to determine their chemistry and physics. The properties of neutral oxygen vacancies in metal oxides of increasing complexity (MgO, CaO, alpha-Al2O3, and ZnO) have been studied using density functional theory. Vacancy formation energies, vacancy-vacancy interaction, and the b…