Materials Literature
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Abstract A novel biodegradable amphiphilic copolymer with hydrophobic poly(ε‐caprolactone) branches containing cholic acid moiety and a hydrophilic poly(ethylene glycol) chain was synthesized. The copolymer was characterized by FTIR, 1 H NMR, gel permeation chromatography (GPC), differential scanning calorimetry (DSC)…
Seeded batch crystallizations of monohydrate citric acid were performed under isothermal conditions (15 °C). Continuous monitoring of the overall solid concentration during the crystallization process was developed using in situ Raman spectroscopy. Quantitative estimation of the crystal size distribution (CSD) was mad…
We have studied the electronic and magnetic properties of Co2MnSi/GaAs(001) heterostructure within the framework of the density functional theory by using the plane wave pseudopotential approach, with the aim of identifying possible interface morphologies where the peculiar half-metallic character of the constituent H…
Polycrystalline sample of (Na0·5Bi0·5)TiO3 was prepared using a high temperature solid-state reaction synthesis at 1070°C and subsequent sintering at 1100°C in oxygen atmosphere. X-ray diffraction (XRD) analysis of (Na0·5Bi0·5)TiO3 powder indicated the formation of a single phase rhombohedral structure. Dielectric stu…
Ultrathin, perfectly ordered anodic aluminum oxide templates have been produced on supporting substrates by focused ion beam prepatterning. This fast, flexible approach produces pore arrays with both hexagonal and square geometries and allows control over the pore pitch and diameter. The orientation of ordering can be…
Interdiffusion and welding behaviors of a miscible pair of poly(methyl methacrylate)/poly(styrene- ran -acrylonitrile) (PMMA/SAN) laminates were investigated by energy-filtering transmission electron microscopy (EFTEM) and asymmetric double beam cantilever (ADBC) test. The composition variations across the interfaces…
A multilayer semiconducting BaTiO 3 ceramics having positive temperature coefficient of resistivity (PTCR) characteristics is investigated with the aim of lowering its resistance. The multilayer BaTiO 3 ceramics was fired in reducing atmosphere and reoxidized at 700 °C in air. The result reveals that the multilayer se…
High quality gallium doped ZnO (Ga:ZnO) thin films were grown on c-Al2O3(1000) by plasma-assisted molecular beam epitaxy, and Ga concentration NGa was controlled in the range of 1×1018–2.5×1020∕cm3 by adjusting∕changing the Ga cell temperature. From the low-temperature photoluminescence at 10K, the donor bound exciton…
This study aimed to produce polyhydroxyalkanoates (PHAs) from organic wastes by mixed bacterial cultures using anaerobic-aerobic fermentation systems. Palm oil mill effluent (POME) was used as an organic source, which was cultivated in a two-step-process of acidogenesis and acid polymerization. POME was operated in a…
The temperature dependence of the band gap of hydrogen-passivated Si nanocrystals of radius $R=0.7$ and $1.1\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ has been calculated from first principles using constant-temperature molecular-dynamics simulations. The band-gap change with temperature $\mathrm{\ensuremath{\Delta}}{E}_…
The Co-doped titanate nanotubes, synthesized via a hydrothermal reaction, are calcined at 300, 400, and 500°C for 2h in an argon atmosphere to yield Co-doped TiO2(B) nanotubes and anatase nanotubes with a dark gray color. It is shown that all calcined titania nanotubes have a stronger absorption in visible region, att…
Ab einer bestimmten Größe liegen Borcluster nicht mehr bevorzugt planar, sondern zylindrisch vor. Eine Kombination aus experimenteller Bestimmung von Stoßquerschnitten und Dichtefunktionalrechnungen ergab, dass der Übergang von planaren zu zylindrischen Strukturen für Borcluster-Kationen bei B16+ stattfindet. Das Bild…
Depending on the temperature, crystal polytype, and crystal position, two opposite schemes have been observed for the optical alignment of the populations of spin sublevels in the ground state of a Si vacancy in SiC upon irradiation with unpolarized light at frequencies of zero-phonon lines. A giant change by a factor…
Statistical mechanics predicts that the design of pure organized heteropolymetallic chains of metal ions bound to linear receptors depends on controlled deviations from the mixing rule DeltaE(MiMj) = 1/2 (DeltaE(MiMi) + DeltaE(MjMj)), whereby DeltaE(MiMj) is the intramolecular intermetallic interaction between neighbo…
Low temperature electrical transport properties of boron-doped zinc oxide thin films prepared by metal-organic chemical vapor deposition technique were investigated. The temperature coefficient of resistivities is negative at low temperatures and becomes positive at relatively high temperatures. The magnetic field dep…
Processing and Properties: Magnetron-Sputtered Hard and Yet Tough Nanocomposite Coatings with Case Studies Properties of Chemical Vapor Deposited Nanocrystalline Diamond and Nanodiamond/Amorphous Carbon Composite Films Synthesis, Characterization and Applications of Nanocrystalline Diamond Thin Films Properties of Har…
A estabilidade de complexos organo-minerais é uma característica importante quanto à química e física de solos tropicais e subtropicais. O objetivo deste estudo foi identificar variáveis relacionadas à estabilidade de complexos organo-minerais, avaliada pela energia de ultra-som necessária para a dispersão total do so…
The adsorption behavior of benzoate, citrate, tartrate and glutamate on calcite dispersed in water was studied. At r. t. and pH = 9, the molar amount of substrate adsorbed decreases with increasing number of carboxylic groups in the molecule. Thus, monofunctional benzoate adsorbs in significantly higher molar amounts…
This paper examines the effect of processing temperature on polystyrene (PS)/CO 2 and polycarbonate (PC)/CO 2 polymeric foaming systems. Using in situ visualization data from batch foaming experiments, plastic foam characteristics including cell density and average cell size at different processing temperatures were a…
A copper foil etched in a dilute solution of HNO 3 is free of carbon and oxygen, but the nanostructure formed thereby is highly active for surface-enhanced Raman scattering (SERS), especially when 632.8-nm radiation from a He/Ne laser is used as the excitation source. We found further that the copper foil thus prepare…