Materials Literature
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The magnetism and its dynamical behavior is investigated in relation to electron-localization effect for the edge-state spins of three-dimensional randomly networked nanographene sheets which interact weakly with each other. The electron transport is governed by Coulomb-gap variable-range hopping between nanographene…
Compositional modification of ferroelectric BiScO 3 –PbTiO 3 (BS–PT) ceramics was investigated by Zr Sc • doping as a function of temperature and electric field. Zr doping decreased the Curie temperature; yet depoling temperature was higher as determined from the weak field measurements. Weight change measurements exp…
Polyisoprenes (PI) covering a wide range of molecular weights ( M in g/mol) from 652 ≤ M ≤ 4.36 × 10 5 are investigated by dielectric spectroscopy. Normal mode (τ n ) and segmental (or α-) relaxation (τ α ) are considered. The normal mode spectra are singled out by subtracting the spectra of the segmental relaxation.…
Conducting polymer-metal nanoparticle hybrids, fabricated by assembling metal nanoparticles on top of functionalized conducting polymer film surfaces using conjugated linker molecules, enable the selective sensing of volatile organic compounds (VOCs). In these conducting polymer-metal nanoparticle hybrids, selectivity…
Superoleophobic surfaces display contact angles >150 degrees with liquids that have lower surface energies than does water. The design of superoleophobic surfaces requires an understanding of the effect of the geometrical shape of etched silicon surfaces on the contact angle and hysteresis observed when different liqu…
Abstract A systematic study on the composition and bonding structure of plasma‐assisted ALD Al2O3 films deposited at substrate temperatures between 25 and 400 °C is presented. The composition of the films is determined with Rutherford back scattering (RBS) and elastic recoil detection (ERD). The O/Al atom ratio in the…
Oxide‐based phosphors MgY 4 Si 3 O 13 codoped with Ce 3+ and Tb 3+ were prepared in this study. Broad Ce 3+ excitation spectra with the highest intensity at 330 nm were found for MgY 4 Si 3 O 13 :Ce 3+ , Tb 3+ phosphors. Emission lines ranging from 450 to 650 nm originated from the 5 D 4 → 7 F J ( J =6, 5, 4, 3) trans…
The thermal conductivity in a set of mass-graded nanosized model systems has been studied by nonequilibrium molecular dynamics (MD) simulations in order to understand the phenomenon of thermal rectification that has been detected in externally mass-loaded nanotubes. We have found that the preferred direction of the he…
We present a review of the emerging class of hybrid solar cells based on organic-semiconductor (Group IV, III-V), nanocomposites, which states separately from dye synthesized, polymer-metal oxides and organic-inorganic (Group II-VI) nanocomposite photovoltaics. The structure of such hybrid cell comprises of an organic…
Highly transparent ceramics of La‐doped 0.75Pb(Mg 1/3 Nb 2/3 )O 3 –0.25PbTiO 3 were fabricated by a two‐stage sintering method from conventional raw materials. The ceramics exhibited a transparency as high as 65% for the infrared wavelength. Large quadratic electro‐optic coefficient of 66 × 10 −16 (m/v) 2 was obtained…
A new approach for imposing long-range, defect-free confinement was used to study the crystallization kinetics of ultrathin polymer layers. Layer multiplying coextrusion was utilized to create films in which hundreds or thousands of continuous microlayers or nanolayers of a crystallizable polymer were separated by lay…
Recent reports [Smith and Korgel Langmuir 2008, 24, 644-649 and Smith et al. Langmuir 2009, 25, 9518-9524] have implicated certain hexadecyltrimethylammonium bromide (CTAB) products with iodide impurities, in the failure of a seed-mediated, silver and surfactant-assisted growth protocol, to produce gold nanorods. We u…
We demonstrate a simple and versatile way to achieve high yield synthesis of shape- and size-controlled multi-branched gold nanoparticles (MBNPs). Control over the shape of the MBNPs was achieved by varying the ratio of gold to the mild reducing agent ascorbic acid, using a seed-mediated growth approach. Higher ascorb…
Chemically induced grain‐boundary structural transitions are well documented in a number of ceramic systems. It has been hypothesized that transitions between distinct structural states, referred to as complexions, are driven by a reduction in the free energy of the grain boundaries. The current work tests this hypoth…
The osmotic character of long-range interlamellar swelling in smectite clays is widely accepted and has been evidenced in the interlayer space by X-ray diffraction. Such a behavior in mesopores was not experimentally confirmed until the determination of the mesopore size distribution in Na-montmorillonite prepared fro…
Thermally stimulated depolarization current (TSDC) of acceptor (Mg)‐doped BaTiO 3 ceramics was analyzed for submicrometer fine grain specimens. For a fixed condition of polarization field ( E P ) and polarization time ( t P ), the TSDC associated with an oxygen vacancy relaxation showed two peaks with relaxation tempe…
A detailed analysis of the IR spectrum of melt-quenched PLLA−PEG−PLLA sample and its change with temperature is presented. It was found that, in the initial state of the melt-quenched PLLA−PEG−PLLA sample, the PLLA constituent does not exist as a normal amorphous or crystalline phase but as a kind of mesophase, which…
Purpose Zirconia ceramics exhibit high strength and fracture toughness. The purpose of this paper is to research a possibility of crack healing in zirconia ceramics. Design/methodology/approach ZrO2/SiC composite ceramics are sintered and subjected to three‐point bending. A surface crack of 100 μm in diameter is forme…
A crystallographic and magnetic phase diagram of SmFeAsO 1− x F x is determined as a function of x in terms of temperature based on electrical transport and magnetization, synchrotron powder x-ray diffraction, 57 Fe Mössbauer spectra (MS), and 149 Sm nuclear resonant forward scattering (NRFS) measurements. MS revealed…
Trinitrotoluene, usually known as TNT, is a kind of chemical explosive with hazardous and toxic effects on the environment and human health. National and societal security concerns have dictated an increasing need for the analytical detection of TNT with rapidity, high sensitivity and low cost. This work demonstrates…