Materials Literature
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A detailed study of CdSe aerogels prepared by oxidative aggregation of primary nanoparticles (prepared at room temperature and high temperature conditions, >250 degrees C), followed by CO2 supercritical drying, is described. The resultant materials are mesoporous, with an interconnected network of colloidal nanopartic…
We investigate electrically-induced spin currents generated by the spin Hall effect in GaAs structures that distinguish edge effects from spin transport. Using Kerr rotation microscopy to image the spin polarization, we demonstrate that the observed spin accumulation is due to a transverse bulk electron spin current,…
Wurtzite CdS and CdSe nanostructures with complex morphologies such as urchin-like CdS nanoflowers, branched nanowires, and fractal nanotrees can be produced via a facile solvothermal approach in a mixed solution made of diethylenetriamine (DETA) and deionized water (DIW). The morphologies of CdS and CdSe nanocrystals…
The first family of rare-earth-based single chain magnets is presented. Compounds of general formula [M(hfac)3(NITPhOPh)], where M = Eu, Gd, Tb, Dy, Ho, Er, or Yb, and PhOPh is the nitronyl-nitroxide radical (2,4'-benzoxo-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), have been structurally characterized and found to…
Atomic simulation is performed on La1−xSrxMnO3 (x = 1/18,1/9,1/6,2/9 and 1/4) to study the Sr ion distribution and local structure. Our calculation reveals a tendency for Sr clustering rather than a random Sr distribution. It is found that local structures in the vicinity of the La and Sr clusters are different. The e…
The interaction of cytochrome c (cyt c) with poly(isobutylene-alt-maleic acid) (PIMA) and poly(1-tetradecene-alt-maleic acid) (PTMA) was studied using circular dichroism, absorption spectroscopy, and atomic force microscopy to investigate the electrostatic and hydrophobic influence of the copolymers on the structure o…
The first precise measurements of specific heat changes have been performed for a C3N2H5ClO4 crystal using an ac calorimeter. Phase transitions at about 373 and 219 K were revealed. The continuous second-order phase transition at 373 K to the ferroelectric phase is described by the Landau model using specific heat and…
A novel integrated pressure and temperature sensor based on nanocrystalline porous silicon is reported here with a view to develop a smart pressure sensor. A twin MEMS porous silicon/silicon heterojunction structure is designed, fabricated and tested for the integrated pressure and temperature sensor. Pressure and tem…
Recent experiments have indicated that 3-mercapto-1-propanol ligands display a size-dependent binding energy of attachment to the surface of II-VI semiconductor nanocrystals. Using semiempirical calculations, we exhaustively calculate the energy of this bond at each surface site, for CdSe and CdSe/CdS core/shell nanoc…
Inelastic neutron scattering (INS) spectra are presented for chromium(II) Tutton salts, as a function of the temperature and pressure. Transitions are observed between the levels of the 5Ag (Ci) ground term and the data modeled with a conventional S = 2 spin Hamiltonian. At 10 K and ambient pressure, the zero-field-sp…
A classical molecular-dynamics potential for analyzing mechanical deformation in the $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}+\mathrm{fcc}\text{\ensuremath{-}}\mathrm{Al}$ material system is developed. The potential includes an embedded atom method cluster functional, a Morse-type pai…
We present a numerical study of the statistical properties of the potential energy landscape of a simple model for strong network-forming liquids. The model is a system of spherical particles interacting through a square-well potential, with an additional constraint that limits the maximum number of bonds Nmax per par…
We report our observation of solution photochemical reactions catalyzed by carbon nanotubes. Addition of sub-millimolar Ag+ ions into a solution of DNA-wrapped carbon nanotubes (DNA-CNT) leads to a strong charge-transfer band in the UV region of the optical absorption spectrum. Light irradiation of the Ag+/DNA-CNT mix…
The values of the unit cell (UC) parameter were measured and elements of the internal structure were determined in polycrystalline diamond films (PDFs) using x-ray diffraction. It was established that the values of the UC parameter were connected with the dislocation densities in mosaic PDF crystallites. The dislocati…
In the current work, we reported a potential approach to obtain thick ceramic films with controllable grain orientation based on magnetic alignment and polymerization techniques. The slurry containing 40 vol% Bi 4 Ti 2.96 Nb 0.04 O 12 (BINT) ceramic powder, monomer, initiator, and catalyst was drop coated on a Pt subs…
A sodium chloride (NaCl) catalyst (0.1 w/w %) lowers the oxidation temperature of graphitized multiwalled carbon nanotubes: MWCNT-20 (diameter: 20-70 nm) and MWCNT-80 (diameter: 80-150 nm). The analysis of the reaction kinetics indicates that the oxidation of MWCNT-20 and MWCNT-80 mixed with no NaCl exhibits single re…
Abstract The aim of this study was to explore the potential use of silk fibroin (SF) as a catalyst support material for phenol hydroxylation reactions. Iron‐substituted silk fibroin fibers were prepared using formic acid at room temperature and characterized using inductively coupled plasma atomic‐emission spectrometr…
Mn-doped YAlO 3 crystals have been characterized by means of optical absorption, photoluminescence, x-ray luminescence and thermoluminescence measurements. The influence of after-growth high-temperature thermal treatments of the crystals in oxidizing and reducing atmosphere as well as the effect of co-doping with Si 4…
The evolution of surface plasmon resonance (SPR) with alternate air and H 2 treatment was investigated for silver nanoparticles on different SiO 2 -based substrates (soda-lime glass, quartz glass and mesoporous SiO 2 ). It has been shown that evolution behaviours on the three substrates are very different. For silver…
Theoretical description of the field emission of electrons from nanoscale objects weakly coupled to the cathode is presented. It is shown that the field-emission current increases in a steplike fashion due to single-electron charging which leads to abrupt changes of the effective electric field responsible for the fie…