Materials Literature
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Abstract The electrochemical characteristics of a series of heteroleptic tris(phthalocyaninato) complexes with identical rare earths or mixed rare earths (Pc)M(OOPc)M(OOPc) [M = Eu...Lu, Y; H 2 Pc = unsubstituted phthalocyanine, H 2 (OOPc) = 3,4,12,13,21,22,30,31‐octakis(octyloxy)phthalocyanine] and (Pc)Eu(OOPc)Er(OOP…
The interactions of electron beams (e− beam) with ferroelectric oxides based on lead zirconate titanate have been quantified. The beam energy and dose dependencies of surface charge have been manipulated to influence local polarization orientation. The mechanism of ferroelectric domain polarization of 100 nm grains in…
We present a theoretical investigation on the structural and electronic properties of isolated nickel impurities in diamond. The atomic structures, symmetries, formation and transition energies, and hyperfine parameters of isolated interstitial and substitutional Ni were computed using ab initio total energy methods.…
The morphology and optical properties of CdS nanoribbons were studied by transmission electron microscopy and photoluminescence spectroscopy. The wurtzite-structured nanoribbons have a uniform rectangular cross section and grow along the [120] crystallographic direction. They are enclosed by small indice surfaces and…
Dynamics of photoinduced magnetization rotation was studied in ferromagnetic p-(Ga,Mn)As by carefully comparing the temporal profile of the photoinduced polar Kerr rotation with that of the photoinduced reflectivity change. Rotation of ferromagnetically coupled Mn spins is induced by photogenerated hole spins within t…
Buried channel waveguides were fabricated in Er3+–Yb3+ codoped phosphate glasses using focused proton beam writing. Proton ion doses in the range of 1014–1015 ions/cm2 and 2.0 MeV energy were used. The waveguides were located 38 μm below the substrate surface and are in excellent agreement with the transport and range…
Undoped and Os-doped SnO2 thin films have been deposited by the sol–gel method. Their electrical properties have been investigated by resistivity and Hall effect measurements in order to understand the role of Os in the electrical transport mechanism. The measurements have been carried out in 100–500 K temperature ran…
The effects of lattice strain on the magnetic and the transport properties of La0.8Sr0.2MnO3 films grown on an (001) LaAlO3 substrate and on a La0.8Ca0.2MnO3 layer have been studied. It was observed that the metal-insulator and the ferromagnetic transitions turn out to be at higher temperatures for the film deposited…
Infrared-absorption measurements were used to characterize ${\mathrm{OH}}^{\ensuremath{-}}$ and ${\mathrm{OD}}^{\ensuremath{-}}$ stretching frequencies in ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ crystals both nominally pure and doped with either Ti, V, or Mg impurities. Impurities, cooling rates, and ultraviolet irradiati…
The structural stability and electronic structure of the potential hydrogen-storage material ${\mathrm{Li}}_{3}{\mathrm{AlH}}_{6}$ have been investigated up to 90 GPa using density-functional total-energy calculations. At ambient conditions ${\mathrm{Li}}_{3}{\mathrm{AlH}}_{6}$ stabilizes in space group $R3\ifmmode\ba…
We present a simple and general model that describes the ordered assembly of polymer strands on nanotube surfaces. Energetically favorable coiling angles are identified based on geometric constraints that limit the maximum coverage of polymers on the walls of the nanotubes. The coiling angles can be controlled by sele…
Abstract The molecular orientation and strain‐induced crystallization of synthetic rubbers—polyisoprene rubber, polybutadiene rubber, and butyl rubber [poly(isobutylene isoprene)]—during uniaxial deformation were studied with in situ synchrotron wide‐angle X‐ray diffraction. The high intensity of the synchrotron X‐ray…
Abstract We have found that s-SPG and curdlan are capable of wrapping SWNTs and the “periodical” helical structure is created, reflecting the helical nature of the SPG main-chain, on the SWNTs surface. The novel SWNTs/β-1,3-glucan composites were characterized by TEM and AFM, which consistently support the view that t…
A direct manifestation of electron energy quantization in metal nanoparticles is observed in two-photon excited luminescence. Experiments reveal the discrete spectra in broadband anti-Stokes photoluminescence from aggregates of silver colloid particles. A theory based on a spherical quantum-well model for metal nanopa…
It has been found by electron diffraction and high-resolution transmission electron microscopy that each commercial CrO2 particle is enclosed by an epitaxial Cr2O3 layer ∼2.5 nm thick. The epitaxial relationships of Cr2O3 layers on CrO2 particles have been identified. Magnetic hysteresis loops measured at different te…
Multilayered thin films of (Ba0.80Sr0.20)(Ti1−xZrx)O3 (BSTZ) with compositionally graded layer (CGL) have been fabricated by pulsed laser deposition on Pt/TiO2/SiO2/Si substrate. In each CGL, four individual layers of BSTZ with x=0.36, 0.18, 0.08 and 0 are grown in series with equal thickness. Three kinds of thin-film…
Pronase (type XXV serine protease from Streptomyces griseus) efficiently depolymerizes chitosan, a linear beta-->1,4-linked polysaccharide of 2-amino-deoxyglucose and 2-amino-2-N-acetylamino-D-glucose, to low-molecular weight chitosans (LMWC), chito-oligomers (degree of polymerization, 2-6) and monomer. The maximum de…
Electromagnetic waves in waveguides consisting of metamaterials with negative permittivity and permeability are analyzed. It is found that metamaterials can enhance the intensity of the evanescent waves in the cladding without altering the propagation constant of the waveguide for both TE and TM modes. This is a uniqu…
Two novel room-temperature phase transitions are observed, via synchrotron x-ray diffraction and Raman spectroscopy, in the ${\mathrm{PbZr}}_{0.52}{\mathrm{Ti}}_{0.48}{\mathrm{O}}_{3}$ alloy under hydrostatic pressures up to 16 GPa. A monoclinic $(M)$-to-rhombohedral ${(R}_{1})$ phase transition takes place around 2--…
Density functional theory calculations predict two orientations for ellipsoidal C70 fullerenes inside single-walled carbon nanotubes (SWNTs) of different sizes: transverse orientation for C70 in (11,11) nanotubes (d=14.9 Å) and longitudinal orientation for C70 in (10,10) nanotubes (d=13.6 Å). SWNTs with these diameter…