Materials Literature
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Synthesis of gold nanoparticles on surfaces has been accomplished by the incubation of poly(dimethylsiloxane) (PDMS) films in tetrachloroauric(III) acid and chitosan solution at room temperature and 4 degrees C. One important point in the present study is that the synthesis selectively occurred on the PDMS surface. Th…
A photoresponsive hydrogel was prepared by radical copolymerization of N-isopropylacrylamide, a vinyl monomer having a spirobenzopyran residue and cross-linker. By the observation of photoresponsive shrinking and the conductance change, it was confirmed that the hydrogel in an acidic condition exhibited drastic and ra…
We report on a study of the translational sliding motion and dynamic friction in systems of double-walled carbon nanotubes using molecular dynamics simulations combined with theoretical analysis. The sliding motion is described by a one-dimensional analytical model which includes the van der Waals force between the na…
We investigate the structure and magneto-transport properties of thin films of the Co_2Cr_xFe_(1-x)Al full-Heusler compound, which is predicted to be a half-metal by first-principles theoretical calculations. Thin films are deposited by magnetron sputtering at room temperature on various substrates in order to tune th…
The relative importance of electron-lattice ($e\mathrm{\text{\ensuremath{-}}}l$) and electron-electron ($e\mathrm{\text{\ensuremath{-}}}e$) interactions in ordering orbitals in ${\mathrm{LaMnO}}_{3}$ is systematically examined within the local-density $\mathrm{\text{approximation}}+\mathrm{\text{Hubbard}}U$ approximat…
The study of ferroelectric nanodomain tailoring attracts a growing interest not only owing to its possible applications in many fields of nanotechnology, such as various nanostructures engineering and high-density memories, but also it can clarify the physical nature of size, surface and interface effects appearing un…
Porous materials, developed by grafting functional groups through chemical surface modification with a surfactant, represent an innovative concept in energy storage. This work reports, in detail, the first practical realization of a novel carbon electrode based on grafting of vinyltrimethoxysilane (vtmos) functional g…
We investigate modulation instability (MI) in negative-index material (NIM) with a Kerr nonlinear polarization based on a derived (3+1)-dimensional nonlinear Schrödinger equation for ultrashort pulse propagation. By a standard linear stability analysis, we obtain the expression for instability gain, which unifies the…
Using extensive first-principles molecular dynamics calculations, we characterize the superionic phase transition and the lattice and electronic structures of the archetypal Type-I superionic conductor alpha-AgI. We find that superionicity is signalled by a phase transition of the silver ions alone. In the superionic…
Nanofabrication methods and a device architecture are combined to allow for four-point electric, thermoelectric, and electric field-effect measurements on individual Bi nanowires. The figure shows a false-color SEM image of a typical device used in this study, with the 11 Bi nanowires shown as a red → white gradient.…
The structural and magnetic properties of the ferromagnetic Heusler alloy Ni50Mn36Sn14 were studied by magnetization and x-ray powder diffraction measurements in fields up to 5T. The alloy undergoes the martensitic transformation from the L21-type cubic structure with the lattice parameter ac=0.5988nm into an orthorho…
We report results of microwave second-harmonic generation in ceramic samples of MgB2, prepared by different methods. The SH signal has been investigated as a function of the temperature and the static magnetic field. The results are discussed in the framework of models reported in the literature. We show that the pecu…
We report on current-induced magnetization switching (CIMS) in single- crystalline nanopillars. Fe(14 nm)/Cr(0.9 nm)/Fe(10 nm)/Ag(6 nm)/Fe(2 nm) multilayers are deposited by molecular-beam epitaxy. The central Fe layer is coupled to the thick one by interlayer exchange coupling over Cr. The topmost Fe layer is decoupl…
We discuss the influence of disorder on domain structure formation in ferromagnetic phase of diluted magnetic semiconductors (DMS) of p-type. Using analytical arguments we show the existence of critical ratio $ν_{\rm {cr}}$ of concentration of charge carriers and magnetic ions such that sample critical thickness $L_{\…
Optical 3D alignment of nanocylinders has been successfully attained for thin films of a block copolymer (see figure) comprising azobenzene-containing liquid-crystalline polymers and poly(ethylene oxide) via photoinduced massive migration. The out-of-plane and in-plane alignments are achieved by controlling the film t…
Multiferroic Cr-doped BiFeO3 (BFO) thin films were prepared on Pt∕TiO2∕SiO2∕Si(100) substrates by a chemical solution deposition method. From the x-ray photoelectron spectroscopy measurements, it was observed that the valence number of Fe ion in undoped and Cr-doped BFO thin films was found to be almost 3+. It was fou…
The change of ferroelectric, dielectric, and piezoelectric properties with time, the ferroelectric aging phenomena, has been observed in most ferroelectrics. Phenomenologically, aging can be attributed to the gradual stabilization of ferroelectric domains by defects, but the microscopic origin of the domain stabilizat…
Abstract: Facile complexation of the acetylenic triple bonds in the hyperbranched polyynes ( hb -PYs) with cobalt carbonyls readily furnishes cobalt-containing organometallic polymers at room temperature. The cobalt-polyyne complexes are highly resistant to thermolysis. Pyrolyses of the polyyne complexes under nitroge…
The temperature dependences of resistivity, magnetoresistance (MR), and current-voltage $(I\text{\ensuremath{-}}V)$ characteristics of grain boundaries (GB) in ${\mathrm{La}}_{0.6}{\mathrm{Pb}}_{0.4}{\mathrm{MnO}}_{3}$ thin films prepared using bicrystal ${\mathrm{SrTiO}}_{3}$ substrates have been studied. Comparison…
Hyper-Rayleigh scattering (HRS) spectra were measured for liquid solutions of C6H5NO2 and CH3NO2 at T=300 K. The depolarized HRS spectra at small frequency shift are dominated by two components due to reorientation of the nitrobenzene molecules. One is a Lorentzian with spectral width nu1=0.16-0.45 cm(-1) and correspo…