Materials Literature
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We apply the ab initio spin density functional theory to study magnetism in all-carbon nanostructures. We find that particular systems, which are related to schwarzite and contain no undercoordinated carbon atoms, carry a net magnetic moment in the ground state. We postulate that, in this and other nonalternant aromat…
Analogous to the synthesis of CMK-3, ordered mesoporous carbons (OMC) containing nitrogen groups were synthesized using mesoporous silica SBA-15 as a template, polyacrylonitrile (PAN) as a carbon source, and 2,2‘-azobisisobutyronitrile as an initiator. Before carbonization, PAN/SBA-15 composites were treated in air at…
The elucidation of the long range distance dependence of the localized surface plasmon resonance (LSPR) of surface-confined noble metal nanoparticles is the aim of this work. It was suspected that the linear distance dependence found in CH 3 (CH 2 ) x SH self-assembled monolayer (SAM) formation was the thin shell limi…
We consider the effect of magnetically controlled anchoring of ferro-nematic suspensions. Together with co-authors we recently found that application of weak magnetic field to a cell filled with the ferro-suspension induced an axis of easy orientation of the director of liquid crystal on a polymer surface (Mol. Cryst.…
Young’s modulus (Y) of 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 has been investigated for polycrystals and single crystals oriented along 〈001〉, 〈110〉, and 〈111〉. The value of Y〈001〉 and Y〈110〉 for single crystals was dramatically lower than either Y〈111〉 or the polycrystalline averaged value. For ceramics, field dependent measu…
The composition, stability, and thermal evolution of nitric oxide on Rh(100) have been characterized by means of synchrotron radiation fast x-ray photoelectron spectroscopy and low-energy-electron diffraction. At 140 K, there is a single NO chemisorbed species (α2–NO) at saturation, forming a disordered phase which de…
A number of gaseous oxyacid salts have been identified by Knudsen effusion mass spectrometry, while vaporizing Cr(2)O(3) and mixtures of Cr(2)O(3)+Nb(2)O(5), Cr(2)O(3)+Ta(2)O(5), Cr(2)O(3)+BaO, and Cr(2)O(3)+Mg(2)P(2)O(7) from molybdenum and tungsten cells. The stabilities of the gaseous molecules CrMoO(3), CrMoO(4),…
There is a well-known correlation between the shape of the relaxation function (nonexponentiality) and the temperature-dependence of the relaxation times (e.g., fragility), with broader relaxations associated with steeper Tg-normalized temperature dependences. Herein, exceptions to this correlation are described. Five…
Silicon-rich silicon oxide films were deposited by plasma-enhanced chemical vapor deposition. Energy was released into the film by ion bombardment, with the aim of promoting formation of Si nanoclusters and reordering the oxide matrix. The effect of the initial stoichiometry, as well as the evolution of the oxide film…
Complex [(La0.7Sr0.3MnO3)m(SrTiO3)n] [(LSMO)m/(STO)8]15 superlattices with different layer thicknesses (m=5, 8, 12, 16, 32) have been prepared using pulsed liquid injection metalorganic chemical vapor deposition. Transmission electron microscopy and electron diffraction reveal a very clear and well-separated layer seq…
The effect of hydrogen, carbon, and oxygen impurity atoms on the structure of gas-phase and zeolite-supported Rh 6 clusters was studied computationally with a gradient-corrected density functional method. Measured metal−metal distances of Rh 6 clusters on zeolite support were 10−20 pm longer than the optimized distanc…
RAIRS experiments have been performed to investigate the adsorption of NO on Pt{211}. Results show that adsorption is complex and strongly temperature dependent. At 307 K, three bands are seen at saturation with frequencies of 1801, 1609, and 1576 cm -1 . However, at 120 K only two bands, at 1688 and 1620 cm -1, are o…
We have measured electrical and magnetic properties of single crystals of Sb2−xMnxTe3 with x=0–0.045 at temperatures of 2 K to 300 K. Hall effect measurements indicate that each manganese atom donates approximately one hole to the valence band. The magnetic susceptibility is paramagnetic down to 2 K, and both Curie–We…
Abstract For Abstract see ChemInform Abstract in Full Text.
Lanthanum calcium oxoborate is a nonlinear optical material that belongs to the calcium-rare-earth (R) oxoborate family, with general composition of Ca4RO(BO3)3 (R3+=La,Sm,Gd,Lu,Y). X-ray photoemission was used to study the valence band electronic structure and surface chemistry of this material. High resolution photo…
Field-effect transistors (FETs) based on an individual CNx/C nanotube (NT) were fabricated by focus ion-beam technology. The nanotube transistors exhibited n-type semiconductor characteristics, and the conductance of nanotube FETs can be modulated more than four orders of magnitude at room temperature. The electron mo…
We present the results of a systematic investigation of the thermal conductivity, Seebeck coefficient and electrical resistivity for selected members (x=0.3, 0.7, 0.8, and 1) of the LaNi1−xCoxO3 solid solution in the temperature range of 80⩽T⩽320 K. Substitution of Ni by Co drives the system from n-type metallic phase…
Fast relaxation processes in the structural glass and glassy crystal of ethanol as well as in the glassy crystal of cyano cyclohexane were studied by quasielastic light scattering (LS). Depolarized and polarized LS spectra together with the Brillouin line were measured applying a tandem Fabry–Perot interferometer at f…
Abstract The wettability of high‐density polyethylene grafted with methacrylic acid is strongly influenced by the nature of the grafting solvent. Here, the wettability is expressed by the water contact angle and absorbency. The initial (10‐s) contact angle of polyethylene (PE) grafted in acetone/water solution decreas…
Epitaxial SrTiO3 (STO) films were fabricated on CeO2/yttria-stabilized zirconia(YSZ)/Si(001) substrates by the insertion of a TiO2 atomic layer by pulsed-laser deposition. X-ray diffraction and reflection high-energy electron diffraction showed that epitaxial STO films with different out-of-plane orientations have bee…