Materials Literature
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A new type of 4,4'-bis(styryl)-2,2'-bipyridine functionalized by a dialkylamino-azobenzene group has been prepared. This ligand has allowed the preparation of photoisomerizable octupolar tris(bipyridyl)zinc(II) complexes and the corresponding star-shaped polymer by atom transfer radical polymerization (ATRP) of methyl…
The accuracy of the molecular weights Mn and polydispersities of polymer brushes, determined by stretching the grafted chains using atomic force microscopy (AFM) and measuring the contour length distribution, was evaluated as a function of grafting density sigma. Poly(N,N-dimethylacrylamide) brushes were prepared by s…
By using metalorganic chemical vapor deposition, ZnO nanorods, nanotubes, and nanowalls can be selectively obtained by adjusting the growth pressure from 10 to 0.06 Torr. The appearance of different nanostructures is due to different growth modes. The variation of nanostructure shape with change in pressure is explain…
The shear-induced crystallization behavior of poly(butylene terephthalate) (PBT) has been investigated by in-situ small-angle X-ray scattering at temperatures of 198, 203, and 208 °C as well as by ex-situ atomic force microscopy. Increasing the shear rate and/or the shear strain enhances the crystallization kinetics.…
A surface sol-gel process has been demonstrated to be an effective method for the surface modification of silver island films as unique SERS substrates for monitoring molecular adsorption on a dielectric titania surface. This layer-by-layer approach allows control of the thickness of the dielectric surface with a mono…
The synthesis of the perovskite Li 0.3 La 0.566 TiO 3 by a Pechini-type polymerizable precursor method is described. TGA−DTA analysis was carried out on the precursors, and powder XRD analysis was performed on the final products obtained by heating the precursors over a temperature range from 600 to 900 °C during 2 h.…
A series of low-melting, thermally stable cadmium metal-organic chemical vapor deposition (MOCVD) precursors have been synthesized, structurally and spectroscopically characterized, and implemented in growth of highly conductive and transparent CdO thin films. One member of the series, bis(1,1,1,5,5,5-hexafluoro-2,4-p…
A new cholesterol organogelator 4 was synthesized and its gelation property was evaluated. It was confirmed that 4 was an effective gelator for various organic solvents and could self-assemble into network fibers with a bilayer of folded conformation in some organic solvents. Moreover, organogelator 4 could act as a t…
Amphiphilic 2,17-bis-sulfonato-5,10,15(trispentafluorophenyl)corrole (2) and its Ga and Mn complexes (2-Ga and 2-Mn) form tightly bound noncovalent conjugates with human serum albumin (HSA). Protein-induced changes in the electronic absorption, emission, and circular dichroism spectra of these corroles, as well as res…
A method for the removal of the triblock copolymer template from mesoporous silica SBA-15 in two stages has been developed. The mesopores of SBA-15 are first vacated by treatment with sulfuric acid that decomposes accessible portions of the template via ether cleavage. The concentration of the acid was found to be cru…
TiO 2 -supported transition metal oxides (Mn, Cr, and Cu) for the SCR of NO with NH 3 have been synthesized by wet impregnation. The adsorption and coadsorption of NH 3, NO, and O 2, in conjunction with in situ FT-IR spectroscopy, was used to elucidate the reaction mechanism as the samples were heated from 323 to 673…
Possible variations in the dynamical behaviour of LiYF$_{4}$ due to its structural changes following several pressure-induced phase transitions are examined by making use of the complementary techniques of quasi-harmonic lattice dynamics and molecular dynamics simulation. The phonon spectra in the entire Brillouin zon…
The growth of ordered nanorods of mesoporous SBA-15 inside a porous alumina membrane has been achieved for the first time by a simple sol-gel method. The obtained SBA-15 nanorods themselves have ordered hexagonal mesochannels with a size of about 6 nm and have been arranged to form hexagonal arrays by the limitation o…
Short gold nanorods of average lengths ranging between 20 and 100 nm (with corresponding aspect ratios of 2 and 4) were synthesized in excellent yield (approximately 97%). These nanorods were characterized by dark-field microscopy, UV-visible spectrophotometry, and transmission electron microscopy. Temporal evolution…
Crystalline silicon being ubiquitous throughout the microelectronics industry has an indirect bandgap, and therefore is incapable of light emission. However, strong room temperature visible and near-IR luminescence from non-crystalline silicon, e.g., amorphous silicon, porous silicon, and black silicon, has been obser…
Ca films deposited on the surface of Pd(111) were studied by temperature-programmed desorption, X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy, and low-energy electron diffraction (LEED). Multilayer Ca films desorb at 1180 K, which is much higher than that value for any of the alkali metals. Ca ad…
Abstract Summary: Polyaniline doped with camphorsulfonic acid (PANI‐CSA) and ethylcellulose (EC), constitutes the basis of the investigated binary PANI(CSA) 0.5 / m ‐cresol and ternary PANI(CSA) 0.5 /EC/ m ‐cresol solutions. Ternary solutions give rise to gels with a lower elastic modulus and electrical conductivity t…
The thermal dehydration of Mn2P2O7·2H2O was studied, in the range 25–600°C by thermogravimetric analysis (TG-DTG and DSC), x-ray diffraction, and infrared spectroscopy. According to the (TG-DTG and DSC) curves, the dehydration of this salt takes place in two stages. The results of thermal analysis, x-ray patterns, and…
Different vanadium loadings, viz., 3, 4, 6, and 8 wt %, have been supported on mesoporous carbon-coated monoliths. These catalysts have been tested in the SCR of NO at low temperature. Experiments with different monolith configurations and area velocities have been performed. The conversions of the monoliths placed in…
We present a new time-of-flight spectrometer for energy and angle-resolved measurements of electrons emitted in coincidence from a surface. By using a projection method, we can cover nearly 2π of the solid angle above the sample resulting in a very high coincidence efficiency. The use of this new spectrometer for the…