Materials Literature
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Laser-ablated Cu, Ag, and Au atoms react with CO and O2 mixture in solid argon to produce carbonyl metal oxides, (O2)Cu(CO)(n) (n = 1, 2), (eta(1)-OO)MCO (M = Ag, Au), OCAuO2CO, and OAuCO, as well as group 11 metal carbonyls and oxides. These carbonyl metal oxides are characterized using infrared spectroscopy on the b…
Water and liquid carbon dioxide are mixed by power ultrasound to promote the Diels−Alder cycloaddition between cyclopentadiene and methyl vinyl ketone. Performing the reaction in emulsions of water and carbon dioxide leads to the high endo/exo selectivity and conversion that are characteristic of water but specific pr…
Structural and thermodynamic properties of crystalline monoclinic calcium apatites, Ca10(PO4)6(X)2 (X=OH, Cl), were investigated for the first time using a molecular dynamics (MD) technique under a wide range of temperature and pressure conditions. The accuracy of the model at room temperature and atmospheric pressure…
The first bulk n = 3 brownmillerite structure Ca 2 MnAlO 5.5 has been synthesized by high-pressure oxidation of the n = 1 brownmillerite phase, Ca 2 MnAlO 5, such that alternate AlO 4 tetrahedral layers are oxidized to AlO 6 octahedra. Rietveld analysis of room-temperature neutron powder diffraction (NPD) data shows a…
Using self-consistent-field and density-functional theories, we first investigate colloidal self-assembly of colloid-polymer films confined between two soft surfaces grafted by polymers. With increasing colloidal concentrations, the film undergoes a series of transitions from disordered liquid --> sparse square --> he…
We investigated CdTe nanocrystal tetrapods of different sizes by resonant inelastic light scattering at room temperature and under cryogenic conditions. We observe a strongly resonant behavior of the phonon scattering with the excitonic structure of the tetrapods. Under resonant conditions we detect a set of phonon mo…
Nicotinamide dinucleotide binding to transhydrogenase purified from Escherichia coli was investigated by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. Detergent-free transhydrogenase was deposited as a thin film on an ATR prism, and spectra were recorded during perfusion with buffers…
In this work we present for the first time an X-ray structure of a coordinated S-nitrosothiol obtained by reaction of the extremely reactive K[IrCl5NO] with benzylmercaptan in acetonitrile. This surprisingly stable compound, trans-K[IrCl4(CH3CN)N(O)SCH2Ph], was isolated in high yield (80%) and fully characterized by F…
Laser-induced fluorescence and dispersed fluorescence spectra measured in supersonic jets for 9,10,19,20-tetra-n-methylporphycene and 9,10,19,20-tetra-n-propylporphycene reveal, for both compounds, the presence of two different species which are assigned to trans and cis tautomeric forms. Doublet splitting of lines is…
The synthesis and characterization of a new family of ionic liquid crystal dendrimers consisting of the ammonium salts of the commercially available poly(propylene imine) ( G = 1−5) dendrimers and 4-decyloxy-, 3,4-didecyloxy-, and 3,4,5-tridecyloxybenzoic acids are reported. The liquid crystalline behavior was investi…
A new thermally stable second-order nonlinear optical (NLO) inorganic-organic hybrid film was successfully prepared by using a sol-gel process of alkoxysilane dye containing a benzothiazole unit. The dye-bonded precursor was synthesized from 3-isocyanatopropyltriethoxysilane and the heterocycle azo dye 2-[4'-(N-ethyl-…
We have evaluated the thermal stability of BaAl 2 Si 2 O 8:Eu 2+ (BAS:Eu 2+ ) phosphor using its polymorph property and hexagonal and monoclinic crystal structure, depending upon firing temperature for plasma display panel application. When BAS:Eu 2+ samples having each characteristic crystal structure were baked at 5…
Interesting multilayered nanostructures of molecular-scale alternating titania nanosheet and silver metal have been successfully fabricated by combined use of a layer-by-layer route and an in situ room-temperature ultraviolet irradiation technique with a titania nanosheet and a polyethylenimine−Ag + (PEI−Ag + ) comple…
Octylamine capped ZnO nanoparticles with mean diameters in the range of 4-14 nm were obtained by thermolysis of single source metal-organic precursors. The nanocrystals were characterized by X-ray diffraction, transmission electron microscopy, and UV-visible, luminescence, and excitation spectroscopies. The nanocrysta…
Helical mesoporous silica, methylene−silica, ethane−silica, ethene−silica, octane−silica, and phenylene−silica nanofibers were successfully prepared by sol−gel polymerization using a chiral cationic gelator under a shear flow. These helical nanofibers were constructed by bundles of ultrafine nanofibers that were forme…
Pyrophyllite, Al2[Si4O10](OH)2, is the simplest structural prototype for 2:1 dioctahedral phyllosilicates. Since it does not possess permanent structural charge as other clay minerals do, it is used to investigate sorption properties of the clay surfaces not related to the permanent structural charge. The bulk structu…
A series of nitronyl nitroxide (NN) diradicals with linear conjugated couplers and another series with aromatic couplers have been investigated by the broken-symmetry (BS) DFT approach. The overlap integral between the magnetically active orbitals in the BS state has been explicitly computed and used for the evaluatio…
We demonstrate a technique that enables ferromagnetic resonance (FMR) measurements of the normal modes for magnetic excitations in individual nanoscale ferromagnets, smaller in volume by a factor of 1000 than can be probed by other methods. The measured peak shapes indicate two regimes of response: simple FMR and phas…
We show that the accumulation of spin-polarized electrons at a forward-biased Schottky tunnel barrier between Fe and n-GaAs can be detected electrically. The spin accumulation leads to an additional voltage drop across the barrier that is suppressed by a small transverse magnetic field, which depolarizes the spins in…
Optically-detected magnetic resonance (ODMR) and positron annihilation spectroscopy (PAS) experiments have been employed to study magnesium-doped GaN layers grown by metal-organic vapor phase epitaxy. As the Mg doping level is changed, the combined experiments reveal a strong correlation between the vacancy concentrat…