Materials Literature
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We show that the conventional consideration of the electron-field emission from nanocarbons cannot explain the experimentally observed results. We suggest a mechanism of the field emission occurrence from nanocarbons that can solve the existing puzzles. This mechanism implies two successive processes: (1) Tunneling th…
Adsorption of 4-biphenylmethanethiolate (BPMT) has been studied for different-sized gold nanoparticles, with mean diameters of 6, 11, 15, 27, 35, 43, and 97 nm, using surface-enhanced Raman scattering (SERS). Transmission electron microscopy (TEM) images and UV−visible absorption spectra were obtained to examine the m…
The sulfonation of polyaniline (PANI) films by nucleophilic addition of sulfite ion has been controlled through the polymer oxidation state under electrochemical control. The process was monitored by in situ electrochemical quartz crystal microbalance (EQCM), and the polymer oxidation was accomplished by electrode pot…
Abstract Relying on a model allowing to predict mechanical properties and acoustic absorption of a regular f.c.c stacking of hollow spheres, and on a functional analysis of acoustic liners for airplane engines, a methodology for optimal design of a taylored multifunctional material is proposed.
The reactivity of the sterically hindered organofluorosilane 2,6-Mes 2 C 6 H 3 -SiF 3 ( 1 ) (Mes = 2,4,6-trimethylphenyl) under hydrolytic conditions differs substantially from that of the corresponding organo chlorosilane. During the hydrolysis of 1 the combination of thermodynamic (increased Si−F bond strengths comp…
Optical and dielectric anisotropy of the polyimide nanocomposite films prepared from soluble poly(amic‐diethyl ester) precursors has been studied using a prism coupling technique. The composite films showed nonlinear dependence of in‐plane and out‐of‐plane refractive indices (dielectric constants) on the composition.…
Well-aligned and highly porous carbon nanofiber (CNF) arrays were obtained by a template synthesis method, using epoxy-based solution as carbon precursor in the present study. The diameter and length of the nanofiber were accord with pore size of 100 nm and thickness of 50 μm of the anodic aluminum oxide membrane, res…
Abstract In this study, the heat‐shrinkage property in polymer was induced by first compounding low‐density polyethylene/poly(ethylene vinyl acetate) (LDPE/EVA) blends with various amounts of peroxide in a twin‐screw extruder at about 130°C. The resulting granules were molded to shape and chemically crosslinked by com…
We show from ab initio density-functional calculations and model studies that, in the electron-doped manganite ${\mathrm{L}\mathrm{a}}_{x}{\mathrm{C}\mathrm{a}}_{1\ensuremath{-}x}{\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ ($x\ensuremath{\ll}1$), unbound electrons are introduced into the conduction band, which then trap the…
Abstract The pharmaceutical industry is moving towards a profitability gap between increasing costs and decreasing prices. Finally, management has understood that mergers and acquisitions, high throughput screening, and biotechnology alone will not save the companies' earnings. Therefore, classical approaches like the…
Thin films of Ba(Zr0.15Ti0.85)O3 were crystallized in situ at several different oxygen background pressures and temperatures. The optimal temperature and pressure for obtaining films with smooth surface morphology and good electrical properties was found to be 675 °C and 300 mTorr, respectively. Films grown at this te…
We present an experimental study of the magnetic microstructure in the nanocrystalline hard magnet Tb. Field-dependent small-angle neutron scattering (SANS) data are analyzed quantitatively in terms of the correlation function of the spin misalignment. We find that up to applied fields of several tesla the magnetizati…
Polarized optical reflectance and photoreflectance spectra of an out-plane nonpolar (112̄0) ZnO epilayer grown by laser molecular-beam epitaxy exhibited anisotropic exciton resonance structures according to the polarization selection rules for anisotropically strained hexagonal material. Consistently, the electric fie…
peer reviewed
Complexation of tertiary amine containing silica nanoparticles (diameter ≈ 3.0 nm) and a weak acidic polyelectrolyte, poly(acrylic acid), which has a characteristic pH-responsive property, was investigated under various environments. The salt- and temperature-induced association/transformation/dissociation behavior wa…
We present the results of a neutron powder-diffraction study on ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}.$ We show that, contrary to previous reports, a first-order structural transition $R3\ifmmode\bar\else\textasciimacron\fi{}\stackrel{\ensuremath{\rightarrow}}{c}\mathrm{Pnma}$ occurs as…
The thermal decomposition and crystallisation behaviour of boron containing siliconoxycarbide (SiCO) ceramics were studied. The samples were prepared by pyrolysis of SiO 2 /B 2 O 3 filled poly(dimethylsiloxanes) at 1300°C and subsequent annealing at T > 1300°C. TEM and XRD investigations show the formation of β‐SiC…
A tunable metamaterial based on conducting coils loaded by an electronic circuit containing a varicap diode has been demonstrated. The agility exceeds one octave inside the 100–500 MHz range. Permeability levels are significantly increased when the loop is loaded by a proper magnetic material. A model gives a good des…
We report electrical transport measurements of individual carbon nanotubes grown catalytically in a nanoporous anodic aluminum oxide template by thermal chemical vapor deposition of acetylene. The four-terminal resistance at room temperature scales linearly with the nanotube length indicating diffusive nature of trans…
Material selection in real‐world problems normally entails considering several, usually conflicting, design criteria/objectives. Thus, a designer has to strike a balance between these objectives to find the best compromise solution for the particular application. A novel design support tool, the exchange constant char…