Materials Literature
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Gold nanoparticles of 20-100 nm diameter were synthesized within HEK-293 (human embryonic kidney), HeLa (human cervical cancer), SiHa (human cervical cancer), and SKNSH (human neuroblastoma) cells. Incubation of 1 mM tetrachloroaurate solution, prepared in phosphate buffered saline (PBS), pH 7.4, with human cells grow…
A combined experimental and theoretical investigation of the nature of the active form of gold in oxide-supported gold catalysts for the water gas shift reaction has been performed. In situ extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) experiments have shown that in…
Based on the Ehrenfest theorem, an equation of motion that takes relaxation into account has been presented in wave-function theory, and the resulting response functions are nondivergent in the off-resonant as well as the resonant regions of optical frequencies. The derivation includes single- and multideterminant ref…
The overlap of the principal luminescence band of the erbium ion with the low-loss optical transmission window of silica optical fibres, along with the drive for integration of photonics and silicon technology, has generated intense interest in doping silicon with erbium to produce a silicon-based optical source. Sili…
A new methodology for the preparation of well-defined core-shell nanoparticles was developed, based upon the employment of a multifunctional crosslinker to coincidently stabilize supramolecular polymer assemblies and imbed into the shell unique chemical functionalities. Amphiphilic diblock copolymers of poly(acrylic a…
We describe the use of single-wall carbon nanotube (SWNT) thin films as transparent and conducting electrodes for hole collection in poly(hexyl)thiophene-[6-6]phenyl-C61-butyric acid methyl ester (P3HT-PCBM) organic photovoltaics. We report a power conversion efficiency of 1%, with a fill factor of 0.3 and a short-cir…
The title ligand ('L') in crystalline [CuBrL(2)]Br.CH(3)OH and [Cu(OH(2))L(2)]SO(4).H(2)O.CH(3)OH chelates to both the copper(II) cations and the charge-balancing anions.
The synthesis of samples by the sol-gel method with aluminum tri-sec-butoxide as cation precursor, 2-propanol as solvent, and sulfuric acid as hydrolysis catalyst gave rise to nanocapsules with an average diameter of 20 nm and a shell thickness of 3.5 nm. The analysis of the X-ray diffraction patterns and the 27Al MAS…
The interfacial potential and photoelectronic properties of a heterojunction composed of La0.7Ce0.3MnO3 and SrTiO3:Nb have been experimentally studied. A two-dimensional spatial distribution of the electrostatic potential across the La0.7Ce0.3MnO3∕SrTiO3:Nb interface is obtained by the holography technique of the tran…
A plethora of applications are grounded on the physics of electromagnetic interaction with a periodic arrangement of nanostructures. These range from metamaterials and negative index materials to photonic band-gap structures to surface plasmon polariton optics to nanofrequency selective surfaces. There is therefore a…
We studied the structural and optical properties of pseudobinary ${\mathrm{CdS}}_{x}{\mathrm{Se}}_{1\ensuremath{-}x}$ alloy nanowires synthesized by pulsed laser deposition. Experimentally, the lowest direct optical band gap of these single-crystalline and straightly grown alloy nanowires was found to scale linearly w…
Abstract Vanadium cation-exchanged montmorillonite can efficiently catalyze the selective epoxidation of various alkenes and the oxygenation of adamantane using molecular oxygen as a sole oxidant.
Abstract An indolinospiropyran possessing one long alkyl chain on the nitrogen atom of the indoline moiety and two nitro groups on the benzopyran ring, exhibiting negative photochromism in various organic solvents, showed negative photochromism in a Langmuir–Blodgett film. The change in the surface appearance was obse…
Auger electron spectroscopy (AES), thermal-desorption spectroscopy (TDS), and, in particular, molecular-beam scattering techniques have been combined to address particle size effects in the adsorption of CO on Cu-on-ZnO(0001). AES and TDS lead to a Cu coverage, theta(Cu), calibration. The TDS curves, as a function of…
The reaction of [Cr(CN)6]3- with a mixture of trans-[Cr(cyclam)(OH)2]Cl, [Cr(cyclam)(OH)Cl]Cl and [Cr(cyclam)Cl2]Cl affords the cyanide bridged dimer, trans-[HO-Cr(cyclam)-NC-Cr(CN)5]-. The tetraphenylphosphonium salt of the anion crystallizes in space group P2(1)/n and shows a bent arrangement of the Cr1-CN-Cr2 unit…
The binary phase diagram of sodium nitrite and sodium nitrate is currently not well-understood because four earlier determinations of this binary system resulted in considerably different conclusions. Two works classify the system as eutectic and two as a continuous solid solution type, together with different sub-sol…
Abstract The first ab initio calculations were carried out for the electronic, structural and thermodynamic properties of BN x Sb 1– x , BP x Sb 1– x and BAs x Sb 1– x boron ternary alloys. The full potential linearized augmented plane wave (FP‐LAPW) method was employed within density functional theory (DFT). The loca…
(Arylethyl)iridium(III) porphyrins were oxidized selectively with excess 2,2,6,6-tetramethylpiperidinoxy (TEMPO) at the benzylic positions to yield (2-aryl-2-oxoethyl)iridium porphyrins. Other alkyl- and PhCH 2 CH 2 CH 2 -substituted iridium porphyrins did not react or gave complex mixtures and low yields of iridium m…
Charge ordering and Na-vacancy ordering in ${\mathrm{Na}}_{0.75}\mathrm{Co}{\mathrm{O}}_{2}$ are investigated using first-principles electronic structure methods within the generalized gradient approximation (GGA) and $\mathrm{GGA}+U$ approximations. We find that Na ordering is determined not only by a competition bet…
X-ray crystallography and NMR spectroscopy provide the only sources of experimental data from which protein structures can be analyzed at high or even atomic resolution. The degree to which these methods complement each other as sources of structural knowledge is a matter of debate; it is often proposed that small pro…