Materials Literature
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The adsorption and reaction of methanol with iron molybdate catalysts of widely varying Mo/Fe ratio have been investigated using X-ray diffraction (XRD), Raman, temperature-programmed desorption (TPD), and pulsed flow reactor measurements. From these data, we can conclude that Mo is segregated to the surface of all ca…
Modification of sepiolite clay has been performed using triethoxy-3-(2-imidazolin-1-yl)propylsilane in the presence of toluene solution. The modified material was characterized by FTIR spectroscopy, XRD, and simultaneous DTA/TG analysis. It was found that the chemical bonding takes place between the hydroxyl groups an…
We investigate effects of two spin-coating parameters, relative humidity (5% < or = RH < or = 80%) in ambient atmosphere and water content (3 wt % < or = f(H2O) < or = 20 wt %) in solution (rich in tetrahydrofuran), on the structure of breath figures (BF) formed in spin-cast films of polar poly(methyl methacrylate) (P…
Control over nanoparticle shape, liquid crystal (LC) polymer architecture, and the related mesophase structure has made possible the creation of new polymer/CdSe semiconductor nanoparticle composite materials. Surface modification of semiconductor quantum dot nanoparticles by hydrogen-bonded LC polymers resulted in th…
New Keggin-type cobalt(II)/nickel(II)-centered heteropolymolybdates, (C3H5N2)6[Co(II)Mo12O40]10H2O (1) and (NH4)3(C4H5N2O2)3[Ni(II)Mo12O40] (2), were isolated and characterized by IR, UV-vis, single-crystal X-ray diffraction, thermogravimetric, magnetic, as well as electrochemical analyses. The polyanion in the two co…
Eight new diacid amides of dicholesteryl L(D)-alaninates were designed and prepared. The compounds with spacers containing three, four, five, or six carbon atoms and L-alanine residues are denoted as 1a, 2a, 3a, and 4a, respectively, and those containing D-alanine residues are denoted as 1b, 2b, 3b, and 4b, respective…
The synthesis and characterization of new two-dimensional (2D) cyanide-bridged iron(II)−gold(I) bimetallic coordination polymers formulated, {Fe(3-Xpy) 2 [Au(CN) 2 ] 2 } (py = pyridine; X = F ( 1 ), Cl ( 2 ), Br ( 3 ), and I ( 4 )) and the clathrate derivative {Fe(3-Ipy) 2 [Au(CN) 2 ] 2 }·1/2(3-Ipy) ( 5 ), are reporte…
The present study, focused on the sol−gel synthesis of rare-earth-doped zinc oxide, highlights the crucial points involved in the design and development of ZnO/Eu nanosystems with peculiar and easily tunable photophysical properties. ZnO nanopowders containing different europium amounts were prepared starting from zin…
Spider dragline silk proteins, spidroins, have a tripartite composition; a nonrepetitive N-terminal domain, a central repetitive region built up from many iterated poly-Ala and Gly rich blocks, and a C-terminal nonrepetitive domain. It is generally believed that the repetitive region forms intermolecular contacts in t…
The solubility of gallic acid in methanol, ethanol, water, and ethyl acetate was measured at a temperature range of (298.2 to 333.2) K. The gallic acid solubility in different solvents increases smoothly with temperature. The relative solubility of gallic acid in the solvents was found as: w methanol > w ethanol > w w…
Single crystalline gold nanorods (Au NRs) dominated by {110} side facets were employed as seeds to tailor the deposition of Ag. Apart from homogeneous coating, anisotropic coating of Ag was observed and resulted in an orange slice-like shape for the Au@Ag nanocrystal. Different growth rates for the {110} side facets w…
Different types of Binary Nanoparticle Superlattices (BNSLs) have been self-assembled from monodisperse 8.7 nm CdSe and 5.5 nm Au nanocrystals. Fluorescence spectroscopy studies of AlB 2 -type BNSL of CdSe and Au nanocrystals revealed considerably decreased fluorescence and a shortened fluorescence lifetime of the CdS…
An environmentally friendly method using a cell-free extract (CFE) of Rhodopseudomonas capsulata is proposed to synthesize gold nanowires with a network structure. This procedure offers control over the shapes of gold nanoparticles with the change of HAuCl4 concentration. The CFE solutions were added with different co…
Combinations of different aromatic polymers and organic solvents have been studied as dispersing agents for preparing single-walled carbon nanotubes solutions, using optical absorbance, photoluminescence-excitation mapping, computer modeling, and electron microscopic imaging to characterize the solutions. Both the pol…
We report that a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F - ions at the O 2- site. The transition temperature ( T c ) exhibits a trapezoid shape dependence on the F - content, with the highest T c of ∼26 K at ∼11 atom %.
Äußere und innere Oberflächen von mesoporösen Materialien lassen sich unabhängig voneinander modifizieren, indem man die Poren mit einer hydrophoben Monoschicht überzieht und dadurch deren Benetzungsverhalten verändert. In einem Beispiel wurden poröse photonische Siliciumkristalle mit Liganden belegt, die die Zelladhä…
Calculations within the density functional theory approach were performed to obtain structural parameters, electronic band structure, carrier effective masses and optical absorption spectra in orthorhombic CaPbO3. Both local density and generalized gradient approximations, LDA and GGA, respectively, were considered. A…
Abstract The influences of the preparation conditions on the properties of anodic aluminium oxide films were studied by electrochemical impedance spectroscopy. A two‐layer model of the film, consisting of barrier and porous layers was used to analyze the impedance data. The thickness of the barrier layer was calculate…
Abstract Neutron diffraction with isotopic substitution has been used to probe the local environment of silver in a melt‐quench derived bioresorbable phosphate glass. Samples enriched with 107 Ag and 109 Ag were prepared and neutron diffraction data collected. A first‐order difference was taken between the data sets t…
ZnO nanoparticles were successfully coated on the surface of carbon nanotubes (CNTs) during the final stage of the growth process of CNTs using radio-frequency plasma enhanced chemical vapour deposition. During the coating process, Zn or ZnO particles with oxygen vacancies can be selectively anchored to the oxygen ato…