Materials Literature
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Resistive oxygen sensors based on gallium oxide were fabricated in order to analyze their sensing performances (as sensitivity, response, and recovery time) in an oxygen atmosphere at 1000°C. We prepared three types of sensors using a β‐Ga 2 O 3 single crystal in a sandwich structure with Pt pad electrodes and β‐Ga 2…
Ordered mesoporous nanocrystalline titanium-carbide/carbon composites are synthesized by using a solvent-evaporation-induced self-assembly process combined with in situ carbothermal reduction (see figure). The composites comprise crystalline titanium carbides confined in a matrix of amorphous carbon pore walls. The na…
The dynamic behavior of nanoscale mesoporous oxide materials exposed to aqueous solutions under biologically relevant conditions is shown to be highly dependent on composition, porosity, and calcination temperature. Dynamic processes were followed as a function of exposure on thin oxide films amenable to environmental…
Ideal models of complex materials must satisfy all available information about the system. Generally, this information consists of experimental data, information implicit to sophisticated interatomic interactions and potentially other {\it a priori} information. By jointly imposing first-principles or tight-binding in…
Waves propagating inwardly to the wave source are called antiwaves which have negative phase velocity. In this paper the phenomenon of negative phase velocity in oscillatory systems is studied on the basis of periodically paced complex Ginzbug-Laundau equation (CGLE). We figure out a clear physical picture on the nega…
There are many materials whose dielectric properties are described by a stretched exponential, the so-called Kohlrausch-Williams-Watts (KWW) relaxation function. Its physical origin and statistical-mechanical foundation have been a matter of debate in the literature. In this paper we suggest a model of dielectric rela…
We report the magnetic and thermal properties of Dy2Sn2-xSbxO7+x/2, x = 0, 0.25, and 0.5, and Dy2NbScO7. We find evidence for Ising-like single ion ground states in the Dy2Sn2-xSbxO7+x/2 materials. These materials possess nearly the same zero point entropy as the canonical spin ices Ho2Ti2O7 and Dy2Ti2O7, strongly sug…
We study the two-impurity Anderson model for a semiconductor host using the quantum Monte Carlo technique. We find that the impurity spins exhibit ferromagnetic correlations with a range which can be much more enhanced than in a half-filled metallic band. In particular, the range is longest when the Fermi level is loc…
A two-channel switchable nanoscopic hybrid system, able to modulate mass transport by photoresponsive appended organic groups and the presence of G1.5 PAMAM dendrimers as molecular caps, is reported. This new functional gatelike ensemble is chemically (by pH changes) and photochemically (using visible light) controlle…
Two new enantiomerically chiral 3D architectures, l -(Zn(H 2 O) 3 ) 3 [MnMo 9 O 32 ]·4H 2 O and d -(Zn(H 2 O) 3 ) 3 [MnMo 9 O 32 ]·4H 2 O, have been produced from a new way. The compounds were composed of the discrete chiral [MnMo 9 O 32 ] 6- polyoxoanions linked by zinc(II) atoms to a 3D framework with a 2-fold inter…
Ceramic rods consisting of bundles of well-oriented, single-crystal whiskers of Al2O3, Y3Al5O12, and ZrO2 (20 mol % Y2O3) are grown by directional solidification from the melt at high growth rates in an inert atmosphere by using the laser-heated floating zone method. The nanofibrillar eutectic exhibits an outstanding…
Nanocrystalline (Th1-xFex)O2-d particles with different Fe concentrations (x = 0.0, 0.05, 0.10, 0.15, 0.20 and 0.25) have been prepared by a gel combustion method. Rietveld refinement analyses of X-ray diffraction data revealed the formation of an impurity free cubic type Th1-xFexO2-d structure up to x = 0.20. This ob…
The relation between force and stretch in the worm-like chain model of entropic elasticity is examined. Although no closed-form expression is valid for all values of forcing, solutions in the form of asymptotic series can be obtained under conditions of small and large applied force. The small and large stretch limits…
Growing well-diffracting crystals constitutes a serious bottleneck in structural biology. A recently proposed crystallization methodology for "stubborn crystallizers" is to engineer surface sequence variants designed to form intermolecular contacts that could support a crystal lattice. This approach relies on the conc…
Sol-gel processes for fabricating oxides or metalloxane polymers with controlled porous structures have been reviewed. Gel materials having controlled macropores are synthesized by polymerization-induced phase separation and concurrent sol-gel transition in a variety of chemical compositions. Several variations of tai…
We have clearly discriminated the single-, bilayer-, and multiple-layer graphene (<10 layers) on Si substrate with a 285 nm SiO2 capping layer by using contrast spectra, which were generated from the reflection light of a white light source. Calculations based on Fresnel's law are in excellent agreement with the exper…
We report an x-ray photoemission spectroscopy study of spin-crossover complex [Fe(ptz) 6 ](BF 4 ) 2 (ptz = 1-propyltetrazole) to identify the electronic changes due to temperature-induced and photoinduced spin transitions. The energy difference between the Fe 2 p and F 1 s peaks is found to correlate with the low-spin…
We present a non-lithographic technique that produces organized nanoscale nickel catalyst for carbon nanofiber growth on a silicon substrate. This technique involves three consecutive steps: first, the substrate is laser-irradiated to produce a periodic nanorippled structure; second, a thin film of nickel is deposited…
Gut verteilt: Ein hierarchisch geordnetes Material, in dem Goldnanopartikel entlang Kohlenstoffnanoröhren im Abstand von 2.6 nm positioniert sind (unten im Bild; oben: zugehörige TEM-Aufnahme), wird durch Selbstorganisation erhalten, wobei die Funktionalität des oberflächenaktiven Proteins HFBI (ein Hydrophobin) genut…
Nanotube alignment has been found to be one of the key parameters to explain the mechanical properties of carbon nanotube fibres. However, the question of the homogeneity of the alignment across the fibre diameter is still open. This letter reports on the first microdiffraction study of the alignment of nanotubes acro…