Materials Literature
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Measurements of lattice parameters and structural refinement were made for a ${\mathrm{LaGaO}}_{3},$ ${\mathrm{PrGaO}}_{3},$ ${\mathrm{NdGaO}}_{3},$ ${\mathrm{La}}_{0.34}{\mathrm{Pr}}_{0.33}{\mathrm{Nd}}_{0.33}{\mathrm{GaO}}_{3},$ and ${\mathrm{La}}_{0.63}{\mathrm{Nd}}_{0.37}{\mathrm{GaO}}_{3}$ samples by powder-diffr…
Although boron-doped diamond (BDD) is itself quite stable and chemically inert, some electrochemical applications could require further improvement, and fluorination could be one of the most promising methods. In the present paper, a characterization of diamond film electrodes surface-modified by fluorine insertion, t…
Thin-film transistors based on aligned carbon nanotubes (CNTs) were fabricated by directly growing highly ordered CNTs on silicon dioxide surface. The transistor shows a pronounced field effect. Electric transport through the aligned carbon nanotubes is dominated by the holes at room temperature. A hole mobility (μp)…
Heat capacity measurements were made on aqueous solutions of a triple-helical polysaccharide schizophyllan by precision adiabatic calorimetry over a wide range of concentrations 30.45-90.93 wt % at temperatures between 5 and 315 K. The heat capacity curves obtained were divided into four groups depending on the weight…
We report the results for laser site selective excitation spectroscopy of ${\mathrm{Eu}}^{3+}$-doped yttrium aluminum garnet. We identified four primary luminescent centers (A--D) from the ${}^{7}{\stackrel{\ensuremath{\rightarrow}}{{F}_{0}}}^{5}{D}_{0}$ excitation spectra and, from the ${}^{5}{\stackrel{\ensuremath{\…
In this work we correlate between O− electron stimulated desorption (ESD) from hydrogenated and bare polycrystalline diamond films exposed to thermally activated oxygen for incident electron energies in the 4–23 eV range and vibrational electron energy losses. By utilizing the previously established mechanism of low e…
Conjugated polymers and oligomers can serve as highly responsive fluorescent reporters for biosensor applications. However, their optical properties in aqueous media are highly dependent upon environmental conditions. The structure of the paracyclophane framework provides a platform for designing optical reporters tha…
We present a random walk based investigation of the pore size probability distribution and its moments, the survival probability and mean survival time, and the principal relaxation time, for random and ordered arrays of cylindrical fibers of various orientation distributions. The dimensionless mean survival time, pri…
Nanostructured gold/monolithic mesoporous silica assembly was synthesized by a sonochemical method. The optical absorption maximum of the as-prepared nanocomposite varies from the visible to near-infrared region, depending on the reduction rate of AuCl4− ions in solution. There exists a critical reduction rate of AuCl…
When a bubble rising in distilled water or in an aqueous pentanol-1 solution approached the air/water interface, rapid pulsations of its shape with a frequency of more than 1000 Hz were observed. In addition, the bubble bounced from the free surface, prior to its rupture or to the formation of a foam film. It is rathe…
We have used molecular dynamics methods to investigate the effects of cyclic chain architecture on the properties of dilute solutions. In order to include solvent effects in estimating these properties, we use a van der Waals scaling factor determined for each solvent by matching to the theta condition. We predict tha…
Methane is the simplest organic molecule, and like many supposedly simple molecular materials it has a rich phase diagram. While crystal structures could be determined for two of the solid phases, that of the low temperature phase III remained unsolved. Using high-resolution neutron powder diffraction and a direct-spa…
In this work we present an efficient procedure to evaluate effective pair potentials compatible with "experimental" distribution functions using a Monte Carlo simulation scheme. Using computer simulation results for the pair distribution functions, we have applied the method to a Lennard-Jones fluid and to a model of…
Field emission characteristics from multiwall carbon nanotubes were studied under various gas environments. The experiments on field emission revealed several surface reactions under high-vacuum operating conditions. The Fowler–Nordheim (F–N) analysis showed a field emission regime dominated by the surface adsorbents,…
The cristobalitelike forms of the ternary silica analogues BPO4 and BAsO4 were investigated at high pressure by x-ray diffraction and theoretical methods. The behavior of these compounds represents an extreme case in which the tilt angle of the constituent tetrahedra increases in a spectacular way at high pressure res…
The values of uniaxial anisotropy Hk in thin polycrystalline Permalloy™ films measured by static and dynamic methods differ by as much as a factor of 1.5. The anisotropy obtained with a pulsed inductive microwave magnetometer in 2.5 to 100 nm thick Permalloy films exhibits an additional isotropic component of 120 to 2…
Charge transport in conducting polymers (polyaniline and polypyrrole) bridged between two gold nanoelectrodes separated with a nanoscale gap (varying from \ensuremath{\sim}1 nm to a few tens of nm was studied by controlling the polymer redox states electrochemically. In sharp contrast to the macroscopic samples, the c…
Colloidally prepared CdSe and CdSe/ZnS core-shell nanocrystals passivated with trioctylphosphine/trioctylphosphine oxide and hexadecylamine have been studied by photoelectron spectroscopy with tuneable synchrotron radiation. High-resolution spectra of the Se 3d level in CdSe nanocrystals indicate the bonding of organi…
Combinatorial laser molecular-beam epitaxy method was employed to fabricate epitaxial Zn1−xMnxO thin films in a high throughput fashion. Local structures around Mn were investigated for these c-axis-oriented epitaxial films by fluorescence x-ray absorption fine structure measurements. It was shown that Mn substitution…
Photo-oxidation of densely packed monolayer of CdSe quantum dots (QDs) was studied by time-resolved photoluminescence (PL) spectroscopy. Electrons yielded in QDs by the strong laser-pulse irradiation can assist the oxidation of CdSe QDs. Such rapid photo-oxidation does not introduce more nonradiative defects, instead,…