silicon and naphthalene

A theoretical investigation of stabilities and electronic properties of novel transition bimetallic atoms (BTMAs) encapsulated naphthalene-like Si(20) prismatic cage is being reported for the first time. The symmetry and electronic state of naphthalene-like TMA(2)@Si(20) is significantly affected by the type of encapsulated TMA from 3d, 4d to 5d series. Because of high binding energies, relative high HOMO-LUMO gaps, large charge-reverse transferring from naphthalene-like Si(20) cage to BTMAs at the centre of the 5d series, the most stable species of TMA(2)@Si(20) cage is favorable to form new 1D-TMA(n)@Si(m) nanotube, which is based on array of the novel naphthalene-like structure.

Topics: Computer Simulation; Models, Chemical; Naphthalenes; Silicon; Transition Elements

CoSi particles on a silica support, synthesized by metal organic chemical vapor deposition (MOCVD) of Co(SiCl(3))(CO)(4) as a precursor at atmospheric pressure and moderate temperature in a fluidized bed reactor, show high catalytic activity and selectivity in naphthalene hydrogenation.

Topics: Catalysis; Cobalt; Hydrogenation; Microscopy, Electron, Transmission; Naphthalenes; Porosity; Silicon; Silicon Dioxide; Surface Properties; X-Ray Diffraction

We demonstrate here a novel method for self-assembling in dimensional alignment the alkoxy-capped silicon nanoparticles synthesized through a room-temperature chemical route. The alkoxy-capped silicon nanoparticles were prepared via a reduction of silicon tetrachloride with sodium-naphthalide and subsequent surface capsulation with 1-octanol monolayers. In the present method, a sublimation process, which was employed as a final purification process for removing the residual naphthalene, influenced significantly on the final morphology of the resultant nanoparticles. Scanning transmission electron microscope (STEM) confirmed the spherical nanoparticles on a holey carbon grid after sublimation process, while only the fibril-like morphology just before sublimation process. In the former sample, the resultant particle size was measured by STEM to be about 9.5 nm +/- 3.4 nm. On the other hand, in the latter sample, the fibril-like structures were shaped by self-assembled silicon nanoparticles in dimensional alignment. The diameters and lengths of the fibril-like assemblies were approximately measured to be 10 to 20 nm and over 5 microm, respectively.

Topics: 1-Octanol; Microscopy, Electron, Scanning Transmission; Nanostructures; Nanotechnology; Naphthalenes; Particle Size; Silicon

Topics: Animals; Cell Culture Techniques; Drug Evaluation, Preclinical; Hepatocytes; Humans; Lab-On-A-Chip Devices; Microchip Analytical Procedures; Microfluidic Analytical Techniques; Models, Animal; Naphthalenes; Rats; Silicon; Tegafur; Tissue Engineering; Toxicology

A novel silica-bonded stationary phase containing a functionalized resorcinarene selector was prepared by a straightforward synthesis. The complete modification of all resorcinic hydroxyl groups was achieved by reaction with isopropyl isocyanate. The derivatized resorcinarene selector was subsequently immobilized via the four alkenyl chains containing a terminal double bond by a free radical-induced reaction on mercaptopropyl-functionalized silica. A comprehensive characterization of the resulting bonded stationary phase was carried out by solid state NMR, IR and elemental analysis. The resulting selector is defined as a "polar headed" reversed phase since the highly ordered polar carbamate groups of the new stationary phase are located, compared to conventional polar embedded stationary phases, at a greater distance from the silica surface. Thus a new concept is introduced in the field of polar modified reversed-phase HPLC. The properties of the novel stationary phase are demonstrated by comparison with commercially available reversed phases.

Topics: Anthracenes; Calixarenes; Chromatography, High Pressure Liquid; Isotopes; Naphthalenes; Nuclear Magnetic Resonance, Biomolecular; Phenol; Phenylalanine; Silicon; Silicon Dioxide; Spectrophotometry, Infrared; Spectroscopy, Fourier Transform Infrared