Materials Literature
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Cu deposition on the surface of spherical SiO2 nanoparticles was studied to achieve the hybrid structure of Cu-SiO2 nanocomposite. SiO2 nanoparticles served as seeds for continuous Cu metal deposition. The chemical structure and morphology were studied with X-ray photoelectron spectroscopy (XPS), scanning electron mic…
We use optical tweezers to move single silver nanoparticles into near-field contact with immobilized particles, forming isolated surface-enhanced Raman spectroscopy (SERS) active Ag particle dimers. The surface-averaged SERS intensity increases by a factor approximately 20 upon dimerization. Electrodynamics calculatio…
Superhydrophobic bionic surfaces with hierarchical micro/nano structures were synthesized by decorating single-walled or multiwalled carbon nanotubes (CNTs) on monolayer polystyrene colloidal crystals using a wet chemical self-assembly technique and subsequent surface treatment with a low surface-energy material of fl…
A method based on the deconvolution of TPD spectra is proposed for the characterization of surface oxygen groups, which can act as the active sites on carbon catalysts. The method, which was previously used to characterize activated carbons oxidized in the gas phase, has been extended and applied to other materials, c…
We demonstrated nanoscale solid-state thermal rectification. High-thermal-conductivity carbon and boron nitride nanotubes were mass-loaded externally and inhomogeneously with heavy molecules. The resulting nanoscale system yields asymmetric axial thermal conductance with greater heat flow in the direction of decreasin…
Abstract The design of advanced, nanostructured materials at the molecular level is of tremendous interest for the scientific and engineering communities because of the broad application of these materials in the biomedical field. Among the available techniques, the layer‐by‐layer assembly method introduced by Decher…
Results of room-temperature Raman scattering studies of ultrathin graphitic films supported on Si (100)/SiO2 substrates are reported. The results are significantly different from those known for graphite. Spectra were collected using 514.5 nm radiation on films containing from n = 1 to 20 graphene layers, as determine…
The mixing of polymers and nanoparticles is opening pathways for engineering flexible composites that exhibit advantageous electrical, optical, or mechanical properties. Recent advances reveal routes to exploit both enthalpic and entropic interactions so as to direct the spatial distribution of nanoparticles and there…
The title complex, [Pt(C7F7S)2(C8H12)], has twofold rotation symmetry, with the PtII ion in an approximately square-planar coordination geometry.
Abstract A comparative study of the phase diagrams and morphology of blends of poly(2‐ethylhexylacrylate) and low molecular weight liquid crystals (LCs) prepared under different conditions is presented. Two LCs are used; one is the 4‐cyano‐4′‐ n ‐pentyl‐biphenyl and the other is the eutectic mixture of cyanoparaphenyl…
Magnesioferrite (MgFe2O4) powder was prepared through the ceramic route by calcination of a stoichiometric mixture of magnesium oxide and iron oxide. The produced powders of MgFe2O4 were isothermally reduced in pure hydrogen at 800–1000°C. Based on thermogravimetric analysis, the reduction behaviour of magnesioferrite…
To elucidate the nature of transport mechanism below Curie temperature TC, we have analyzed the temperature dependence of resistivity (ρ) and thermopower (S) of metallic La1−xSrxCoO3 (0.30≤x≤0.50). At low temperature well below TC both ρ and S exhibit T2 behavior whereas over a temperature interval just below TC, they…
The Cu3N films were synthesized at room temperature by radio frequency magnetron sputtering in various H2+N2 mixture atmosphere on a glass substrate. The introduction of hydrogen promoted the crystallization of Cu3N distinctly, and the optimized growth of (100) plane was strong. Compared to the films with no hydrogen…
We study theoretically the quantum size effects in a one-dimensional semimetal by a Boltzmann transport equation. We derive analytic expressions for the electrical conductivity, Hall coefficient, magnetoresistance, and the thermoelectric power in a nanowire. The transport coefficients of semimetal oscillate as the siz…
[RhCl(PR3)3] (R = Ph, Et) reacts with the potassium salt of 4-mercaptobenzoic acid to give a mixture of the monomeric and dimeric complexes, [Rh(SC6H4COOH)(PR3)3] and [{Rh(-SC6H4COOH)(PR3)2}2], respectively. With the labile PPh3 coligand, the dimer is the major product, while for the electron-richer coligand PEt3, the…
Mesoporous Ni−MCM-41 molecular sieves with various Si/Ni ratios 25, 50, 75, and 100 were synthesized hydrothermally, and their mesoporous structure was confirmed by various physicochemical techniques such as X-ray diffraction (XRD), N 2 adsorption studies, scanning electron microscopy (SEM), and transmission electron…
An electro-optical activity has been recently reported for hybrid nanocomposite thin films where inorganic silicon carbide nanocrystals $(\mathrm{ncSiC})$ are incorporated into polymer matrices. The role of the interface $\mathrm{SiC}$ polymer is suggested as the origin of the observed second order nonlinear optical s…
A noncontact method to generate and measure torsional waves in rotating shafts by a set of magnetostrictive patches and a solenoid is proposed. The main issues in the present wave experiment are how to generate torsional waves having sufficient power and how not to interfere with shaft rotational motion. Magnetostrict…
Phonon thermal conductivities in both growth and in-plane directions of Si∕Ge superlattices (SLs) with perfect and rough interfaces are calculated by using a lattice dynamics model. In addition to the general trend, the results show that there exist fluctuations of thermal conductivity in both directions for SLs with…
Oxide films of BaTiO3 and MgO were deposited on SrTiO3 single crystal substrates by laser molecular beam epitaxy. Reflection high-energy electron diffraction was performed in situ to investigate the change of growth mode and the lattice relaxation. Due to the different mismatches between epitaxial oxide films and subs…