Materials Literature
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Different sizes of CdTe semiconductor nanoparticles were prepared in aqueous solution. These nanoparticles exhibit narrow fluorescence with full width at half-maximum (FWHM) of 35-45 nm that spans the visible spectrum, and they also have high PL quantum yield with high resistance to photodegradation. In addition, CdTe…
Diameter-controllable single-crystalline ZnO nanowires (NWs), with the [0001] growth direction in the plane, have been fabricated by using thermal evaporation method. The as-grown NWs with diameters of $\ensuremath{\sim}40\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ were implanted with various amounts of Co ions. These ${\…
Abstract The influence of the melt‐blending conditions on the structural, rheological, and interfacial properties of modified montmorillonite/Polyamide‐12 nanocomposites has been studied performing transmission electron microscopy observation combined with X‐Ray diffraction and rheological experiments. In the dilute r…
Abstract Simultaneous synthesis of H 2 and ZnO nanoparticles is investigated by steam‐hydrolysis of Zn vapor in a hot‐wall aerosol flow reactor with separated evaporation, cooling, and reaction zones. Superheated Zn vapor was carried by Ar into a tubular, quartz reactor where it was mixed and quenched by a superheated…
The precipitation of calcium carbonate was studied by adding the sodium carbonate solution to a mixed system such as Still effluent (i.e., CaCl 2 + NaCl solution) of the soda ash manufacturing (Solvay) process, and the effects of controlling factors on calcium carbonate polymorphs were investigated. The products were…
Montmorillonite clay was treated with quaternary ammonium surfactants with 1-3 long chains of 10-18 carbons to form organoclays which can be suspended in non-aqueous solvents. The effects of surfactant chain length, number of long chains, and the properties of the solvent on the colloidal behavior of the surfactant co…
Abstract Heterodiffusion of 65 Zn in Mg, Mg– x Al ( x = 1.77, 3.9 and 9 wt% Al) and the commercial AZ91 alloy was studied in the temperature interval 498–848 K by serial sectioning and residual activity methods. The concentration and temperature dependence of the Zn bulk diffusion coefficient D is described by the rel…
Abstract The influence of low molecular weight additives containing polar groups and modified polyolefin‐based compatibilizers on polypropylene (PP)‐clay nanocomposites (PPCN) has been studied, in terms of intercalation and degree of exfoliation achievable by melt‐state mixing processes. PPCN were prepared by melt mix…
Gold ist gar nicht so inert! Mit Röntgenabsorptionsspektroskopie wurde die Aktivierung von O2 und seine Reaktion mit CO an einem Au/Al2O3-Katalysator untersucht. Die katalytische Aktivität kleiner Goldpartikel bei der Oxidation von CO resultiert aus dem Transfer von Ladung auf Sauerstoff (siehe Bild).
Abstract Poly(butylene terephthalate) (PBT)/organo‐attapulgite (ATT) nanocomposites containing 2.5 and 5 wt % nanoparticles loadings were fabricated via a simple melt‐compounding approach. The crystal structure and isothermal crystallization behaviors of PBT composites were studied by wide‐angle X‐ray diffraction and…
AIMS: To characterize a methane-utilizing poly-beta-hydroxybutyrate (PHB)-producing microbial community. METHODS AND RESULTS: Three different approaches based on microbiology, analytical chemistry and molecular biology were used to determine the composition of the mixed culture. The dominant species, Methylocystis sp.…
Size-selective photoetching was applied to silica-coated cadmium selenide (SiO2/CdSe) nanoparticles to precisely control their photoluminescence properties. The absorption spectra of CdSe was blue-shifted by irradiation of monochromatic light, and finally, the absorption onset agreed with the wavelength of irradiation…
The influence of pulse voltage on the accuracy of charge density distribution in the pulsed electroacoustic technique (PEA) is discussed. It is shown that significant error can be introduced if a low dc voltage and high pulse voltage are used to calibrate charge density. However, our main focus in the present paper is…
Abstract The morphology and rheological and mechanical properties of nanoclay‐reinforced polypropylene nanocomposites were investigated with aid of transmission electron microscopy (TEM), thermo gravimetric analysis, rheometry, and mechanical tests. The organically modified silicate (montmorillonite) was used as a rei…
Abstract When insulator LaAlO 3 is grown by epitaxy onto a TiO 2 ‐terminated {100} surface of insulator SrTiO 3 , the system obtained has a metallic character. This phenomenon has been associated with an electrostatic frustration at the interface, as {100} surfaces of SrTiO 3 are neutral while those of LaAlO 3 are pol…
A simple and straightforward method for growing ultrathin, micropatterned polymer films on surfaces with precise thickness and spatial control is presented. A difunctional ene monomer and a difunctional thiol were photopolymerized on a surface terminated with thiol groups. The surface thiols participate in the polymer…
Abstract This study investigates the preparation, characterization, and mechanical properties of nanocomposites prepared from poly(lactic acid) (PLA), an organoclay, hereafter referred to as Clay, and poly(ε‐caprolactone) (PCL) by melt compounding in a co‐rotating type, twin screw extruder. The molecular weight of the…
The adsorption of a glycine molecule on a model silica surface terminated by an isolated hydroxyl group has been studied ab initio using a double-zeta polarized Gaussian basis set, the hybrid B3LYP functional, and a full periodic treatment of the silica surface/glycine system. The hydroxylated silica surface has been…
Intelligent design? Depending on the starting pH, ultralong nanofibers (see picture; left) or patterns of concentric circles (right) are produced in the polymer-controlled crystallization of BaCO3. The ring patterns are the first examples of nanoparticle self-organization that can be described by a Belousov–Zhabotinsk…
Round up: A fully conjugated cyclododeca-2,7-carbazole is prepared around a porphyrin template and the corresponding empty macrocycle then released. Single molecules could be visualized by STM (see image) and their arrangement by atomic force microscopy. The macrocycles self-assemble into a hexagonal array of columns.…