Materials Literature
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The mobility matrix of a spherical particle moving in a spherical cavity, filled with a viscous incompressible fluid, and with no-slip boundary condition at the wall of the cavity, is evaluated from the Oseen tensor for the cavity by the method used by Lorentz for a particle near a planar wall. For the case that the p…
A two-step floating-ferrocene chemical vapor deposition method has been devised for the preparation of single-layered aligned carbon nanotube (CNT) arrays. In the first step, uniform Fe catalysts are in situ produced and coated on a Si substrate from ferrocene; single-layered CNT arrays are prepared on these catalysts…
We systematically investigate the structural, electronic, and magnetic properties of one-dimensional bimetallic naphethalene sandwich nanowires, [Np 2 V 2 TM 2 ] ∞ (TM = Ti, Cr, Mn, Fe, Np = C 10 H 8, naphethalene) by employing ab initio calculations. Three structures with different alignments of TM atoms (isomer-I, -…
On the basis of density functional calculations, we show that a Ti 4 cluster adsorbed at the (101) surface of NaAlH 4 is able to catalyze both the release of H 2 and the formation of AlH 5 2– groups which have been previously proposed to be the mobile species leading to the formation of the Na 3 AlH 6 product during t…
A redox between hydrofluoric acid and ammonium fluoride-treated silicon nanowires and potassium permanganate solution was investigated. The results showed that MnO2 nanoparticles might grow on the surface of silicon nanowires, which was confirmed with the transmission electron microscope. These MnO2 modified silicon n…
For the fabrication of protrusions in multi-domain vertical alignment liquid crystal displays (MVA-LCDs), a series of complicated and expensive photolithographic processes has to be gone through for the wide viewing angles. In this research, we proposed and demonstrated a new manufacturing approach of the protrusion u…
Micro- and macrostructural behaviors of three different lyotropic liquid crystals (LLCs) loaded with a dendrimer, namely second generation poly(propylene imine) (PPI-G2), were studied by means of rheology and electron paramagnetic resonance (EPR). The three mesophases were L(α), Q(224), and H(II) composed of glycerol…
The piezoelectricity of a multiferroic BiFeO3 thin film deviates from its low-field linear response in electric fields higher than 150 MV/m. Time-resolved synchrotron x-ray microdiffraction reveals a low-field piezoelectric coefficient of 55 pm/V and a steeper increase in strain at higher fields, with an effective pie…
We have explored the low-energy excitations in epitaxial thin films of Eu1-xSrxMnO3 [x = 0.50: spin-glass with short range charge-order and x = 0.58: long range charge-order] using terahertz time-domain spectroscopy. A finite frequency peak structure in optical conductivity is observed at ∼3.5 meV for both the films.…
The dynamic hysteresis of ferroelectric lattice with 90°-domain structure in response to time-varying electric field of frequency ω and amplitude E0 is investigated using Monte Carlo simulation based on the Ginzburg-Landau phenomenological theory. A resonance mode of the polarization switching at low frequency range,…
Using the model of oscillating dipoles, we simulated the photoluminescence intensity of a triple-layered structure where the silicon nanocrystals layer was enclosed by buffer and capping silicon dioxide layers. It was found that a structure with an optimized buffer layer thickness exhibited photoluminescence which was…
A FTIR study of the CO adsorption on a Zn-modified ceria is presented. The results indicate that at lower activation temperatures only Ce 4+ carbonyls were detected, which were reduced with the increase of the activation temperature. At higher activation temperatures, up to three Zn 2+ carbonyls were also identified a…
Here, we report that small but well-defined negative differential resistance (NDR) steps can be observed at critical voltages in unpatterned millimeter-scale manganite films of Pr0.65(Ca0.75Sr0.25)0.35MnO3. We systematically investigate the magneto-transport properties of strained thin films grown on LaAlO3 and SrTiO3…
In the first part of this series, a 3D straight line model was presented for the geometry of two-guide-bar warp-knitted fabrics. In this part, first, the variation of unit cell geometry under uniaxial tension in the range of elastic deformation is investigated. In the present study, the energy method and Castiglianos'…
The as-grown single crystal Fe${}_{1.08}$Te${}_{0.55}$Se${}_{0.45}$ with the tetragonal PbO-type structure is nonsuperconducting owing to the excess Fe. Superconductivity is induced after oxygen annealing with an onset and zero resistance transition temperature around 14.5 K and 11.5 K, respectively. The oxygen doping…
Nano-Rost: Fe2O3-Nanomaterialien mit kontrollierter Kristallphase und Morphologie wurden hergestellt. γ-Fe2O3-Nanostäbchen, die durch die {110}- und die {100}-Facetten begrenzt sind, sind sehr aktive und stabile Katalysatoren für die selektive katalytische Reduktion von NO mit NH3. Das Bild zeigt die Form und Oberfläc…
A double sandwich polyoxometalate and its Fe(III) substituted derivative, [As(2)Fe(5)Mo(21)O(82)](17-) (1) and [As(2)Fe(6)Mo(20)O(80)(H(2)O)(2)](16-) (2), were synthesized and characterized by single-crystal X-ray diffraction, infrared spectroscopy, fluorescent spectroscopy, UV spectra, thermogravimetry-differential s…
Individual air-suspended single-walled carbon nanotubes are imaged both spatially and spectrally in photoluminescence. At low excitation power, photoluminescence is bright and stable with high quantum efficiency; however, higher power initially causes a gradual red shift and then more severe changes. Blinking, the los…
We verified the intimate relation between magnetism and volume in Mn3ZnN. The sample sintered at 900 °C is characterized by the Γ5g triangular antiferromagnetic (AF) state with larger volume below 170 K. However, for the sample sintered at 700 °C, the re-entrant phase transition appears at 80 K and the ground state is…
Materials and processing conditions have been developed allowing co‐firing of fluxed PZT ‐ SKN materials with commercial low temperature co‐fired ceramic ( LTCC ) tapes. Previously, Pb ( Zr 0.53 , Ti 0.47 ) O 3 – Sr (K 0.25 , Nb 0.75 ) O 3 ( PZT ‐ SKN ) ceramics fluxed with 1 wt% LiBiO 2 and 1 wt% CuO addition were sh…