Materials Literature
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We performed electrooptical measurements in the smectic-C α * (SmC α * ) phase of the antiferroelectric liquid crystal, 4-(1-methyl-heptyloxycarbonyl)phenyl 4-octylcarbonyloxybiphenyl-4-carboxylate (MHPOCBC), and showed that the frequency dispersion of the second-order electrooptic response strongly depends on the ang…
Accumulated poly-b-hydroxybutyrate (PHB) was determined in lactic acid bacteria belonging to the genera Lactobacillus, Lactococcus and Streptococcus. Lactobacilli were grown in MRS broth and the others were grown in Elliker broth medium. Cell biomass was obtained by centrifugation. The cell walls were lysed with sodiu…
The perovskite oxide SrFeO 3 has been investigated by high-pressure 57 Fe Mössbauer spectroscopy and X-ray powder diffraction (XRD) up to 62 GPa and 56 GPa, respectively. Magnetic ordering occurs below 134 K at 0.1 MPa and below 210 K at 15 GPa. Above 17 GPa, the magnetic ordering temperature increases markedly to abo…
The electrical and magnetic transport behaviour of composite samples of (1−x)La 0.67 Ca 0.33 MnO 3 + x Fe 3 O 4 with x = 0, 0.1%, 1% and 2% were studied in a temperature interval 10–300 K and for magnetic fields H = 0, 0.3, 0.5, 1 and 3 T. The temperature and magnetic field dependence of resistivity of composites show…
Electrical and crystallographic properties of Sn-doped In 2 O 3 (ITO) films prepared on polyethylene terephthalate (PET) webs as the roll-to-roll flexible substrates by DC magnetron sputtering were examined before and after the annealing under air. The ITO films were deposited at the substrate temperature of 100°C und…
An optimization method was developed for improving the designs of broadband linear polarization converters using a twisted nematic liquid crystal film and two uniaxial compensation films. As compared to the Poincaré Sphere approach, our optimization method takes the material dispersions into consideration and results…
The absorption spectra of the AB- and AA-stacked nanographite ribbons have several prominent peaks. They strongly depend on the edge structure, the ribbon width, the stacking sequence, and the polarization direction. The armchair ribbons quite differ from the zigzag ribbons. The frequency and the number of the absorpt…
The optical properties of quasi-one-dimensional metallic ${\mathrm{LaTiO}}_{3.41}$ are studied for the polarization along the a and b axes. With decreasing temperature modes appear along both directions suggestive for a phase transition. The broadness of these modes along the conducting axis might be due to the coupli…
We report an experimental study on the temperature dependence, from 6 K up to 300 K, of the 4.4 eV emission excited at 7.6 eV via the conversion between two different types of oxygen deficient centers in silica. The photoluminescence undergoes a thermal quenching above 50 K, its amplitude decreasing by a factor of 10,…
We report measurements of time-of-flight charge carrier mobility and thermal optical polarized microscopy on a new class of hexagonal columnar $({\ensuremath{\Phi}}_{h})$ liquid crystals (LC) self-organized from supramolecular cylinders self-assembled from acene functionalized dendrons. We discuss the temperature and…
Aluminum-doped zinc oxide (AZO) films were deposited on glass substrates at 300°C by reactive mid-frequency (mf, 50 kHz) magnetron sputtering using dual magnetron cathodes with aluminum–zinc alloy targets. In order to keep the very high deposition rate stable in the transition region of the reactive sputtering system,…
Epitaxial ZnO films have been grown on Si (111) substrates by molecular beam epitaxy using ozone as an oxygen source. An initial deposition of a Zn layer followed by its oxidation produces a superior template for the subsequent ZnO growth. The reflection high-energy electron diffraction measurement suggests that the i…
The measurements of sound velocity and neutron scattering in the liquid state, and DSC and XAFS measurements in the amorphous state were carried out for Ge 15 Te 85 and Ge 15 Te 85- X M X (M = Ag, Cu and In) to investigate the correlation between the glass forming ability and local structure in the liquid and amorphou…
We have adapted the Callaway-Holland model so that the dispersive effect and correction term ${\ensuremath{\kappa}}_{c}$ can be included in the theoretical analysis of the lattice thermal conductivity of LiF over the temperature range 1--300 K, for varying concentration of the isotopic content ${}^{7}\mathrm{Li}.$ Som…
We have investigated the thermoelectric power of millimeter-long aligned multiwall carbon nanotubes down to a temperature of $T=1.5\mathrm{K},$ and observed an accurate $T\mathrm{ln}T$ dependence at low temperatures. This behavior is possibly originated from the repulsive interaction between the electrons in a disorde…
Organic−inorganic polymer hybrids were synthesized utilizing the host−guest interaction. Cyclodextrins (CDs, α-, β-, γ-CD) could be dispersed in the silica gel matrix at a nanometer level because of the hydrogen-bonding interaction between hydroxyl moieties of CD and residual silanol groups of silica gel. It is known…
We report electro-optic experiments in liquid crystalline freestanding films of achiral hockey stick shaped mesogens with a straight aromatic core. The material forms two smectic mesophases. In the higher temperature phase, a spontaneous polarization exists in the smectic layer plane and the films show polar switching…
Silver–silica nanocomposite thin films were prepared by high pressure d.c. sputtering technique. Films deposited at lower substrate temperature showed a narrow distribution of nanoparticles with nearly spherical shape. Increase in substrate temperature resulted in films with a non-uniform size and shape due to the agg…
Nitrogen radicals were irradiated on the (0001) and (0001) surfaces of the ZnO single crystals, and the stability and the states of N ions on the surfaces were investigated by Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS). On the (0001) surface, many N ions replaced the O ions of ZnO dur…
The novel, functionalized heteropolymolybdate [(O(2)CCH(2)PO(3))(2)Mo(5)O(15)](6-) (1) has been synthesized and characterized by IR and (31)P NMR spectroscopy and elemental analysis. Single-crystal X-ray analysis was carried out on Rb(4)KNa[(O(2)CCH(2)PO(3))(2)Mo(5)O(15)].H(2)O, which crystallizes in the monoclinic sy…