Materials Literature
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The Co3O4/CexZr1−xO2 is a potential catalyst for CO preferential oxidation (CO PROX) in excess hydrogen. This study is devoted to the optimization of the nano-particulate CeO2–ZrO2 supported cobalt oxide catalysts. The effects of Ce/(Ce + Zr) atomic ratio, Co3O4 loading, calcination temperature, as well as reaction co…
Results of the dual field nonlinear dielectric spectroscopy (NDS) studies in supercooled glass forming epoxy resin EPON 828 are presented. For the NDS, changes of dielectric permittivity induced by DC (rectangular) or AC (sine-wave) pulses of a strong electric field were probed by a weak radio frequency electric field…
Above room temperature electronic transport properties of SrxTiyO3−δ films with cation A/B = (La + Sr/Nb + Ti) ratios of 0.9 to 1.2 are compared to STO single crystals with combined Hall carrier densities of 3 × 1016 cm−3 ≤ nH ≤ 1022 cm−3. In contrast to Hall mobility which is single crystal-like (μH ≈ 6 cm2/Vs) only…
The nonlinear dependence of near-infrared photoluminescence (PL) emission on excitation intensity has been measured for individual nanotubes representing six different (n,m) species. Significant deviations from linearity are observed for intensities as low as ~100 W/cm(2), and an approximate inverse correlation is fou…
Raman characterizations show the G peak of an unintentional doped single crystal bilayer graphene (BLG) splits into two peaks: S and AS peaks. From the relative shift between S and AS peaks, the doping concentration is estimated to be from 8.8 × 1012 cm−2 to 2 × 1013 cm−2, as in the same order of that in monolayer gra…
The rare-earth metal(III) ortho-oxomolybdates with the formula Ln0.667[MoO4] (Ln = Ce, Pr, Nd, and Sm) and defect scheelite-type structure crystallize in the tetragonal space group I41/a (a = 533–525, c = 1183–1158 pm) with four formula units per unit cell. The Ln3+ cations at Wyckoff position 4b exhibit a coordinatio…
Silica coated Ag nanoparticles with defined surface plasmon resonances are used to selectively detect and analyze protein cofactors in solution and on interfaces via surface enhanced resonance Raman spectroscopy. The silica coating has a surprisingly small effect on optical amplification but minimizes unwanted interac…
Thin films of cylinder-forming polystyrene- b -poly(methyl methacrylate) block copolymer (PS- b -PMMA) were self-assembled on two sets of surfaces homogeneously covered with random copolymer brush composed of PS and PMMA (P(S- r -MMA)), having styrene fractions, F St, ranging from 0.57 to 1.0: one set that had been ex…
We report ambient piezoresponse force microscopy (PFM) studies of the multiferroic hexagonal manganite HoMnO3 performed on the cleaved (110) surface of a single-crystal specimen. By changing the sample orientation with respect to the cantilever, we observed an unexpected out-of-plane PFM signal at domain walls, which…
The gas-phase fragmentations of a series of Keggin polyoxometalate anions with molecular formula of TBA(n)[XM(12)O(40)] (X = P, Si; M = Mo, W) were studied by electrospray ionization tandem mass spectrometry. The bare polyoxoanions [XM(12)O(40)](n-) as well as the non-covalent complexes {TBA[XM(12)O(40)]}((n-1)-) and…
In this paper, a CO 2 laser was used for treating cotton fabric. By controlling the laser process parameters, resolution (40, 50 and 60 dpi) and pixel time (100, 110 and 120 µs), the fabric properties changed accordingly. Fabric weight and strength decreased with increase of resolution and pixel time. However, yellowi…
Variable energy positron annihilation lifetime spectroscopy of high-mobility La-doped SrTiO3 grown by molecular beam epitaxy found that the films contained sufficiently low concentrations of Sr vacancies and vacancy cluster defects to allow the observation of positron annihilation events from the perfect lattice. This…
Ultrafine-grained metals have impressive strength but lack the thermal stability necessary for most applications. Nano-scale, deformation twinned copper microstructures exhibit a rare combination of strength and stability. While storing less energy in their interfaces than other nanostructured metals, they also exhibi…
The effect of Joule heating on graphene electronic properties is investigated by self-consistent use of full-band Monte Carlo electron dynamics and three-dimensional heat transfer simulations. Several technologically important substrate materials are examined: SiO2, SiC, hexagonal BN, and diamond. Results illustrate t…
An accurate knowledge and optimization of dry-cured ham elaboration processes could help to reduce operating costs and maximize product quality. The development of nondestructive tools to characterize chemical parameters such as salt and water contents and a(w) during processing is of special interest. In this paper,…
L-Lysine functionalized tetrachloroperylene bisimide (Lys-4ClPBI-Lys) was synthesized, and its aqueous self-assembly behaviours were investigated at different pH values. The zwitterionic-type Lys-4ClPBI-Lys amphiphile spontaneously self-assembled into a uniform monolayer film in water at pH ranging from 9 to 1, wherea…
A series of well-defined polymer-drug conjugates were prepared in order to modify the physical properties of a known cytotoxic drug, 7-ethyl-10-hydroxycamptothecin (SN-38), the active metabolite of irinotecan (CPT-11). Reversible addition-fragmentation chain transfer (RAFT) polymerisation was used to covalently and si…
Flexible two-component polyurethane foam was synthesized under various extents of overpressure up to 2 bar. The influence of the pressure conditions on shrinkage and basic foam properties such as the relative density, microstructure, and ratio of open to closed pores as well as the elastic mechanical properties were i…
In order to study the optical switching of vanadium dioxide (VO2) and its thermal hysteresis behavior, we fabricated VO2 films on glass substrates at various oxygen pressures. Only the VO2 films made at 5–10 mTorr displayed x-ray diffraction peaks and metal-insulator transition. Upon heating and cooling, remarkably, t…
The interplay between quantum Hall states and Cooper pairs is usually hindered by the suppression of the superconducting state due to the strong magnetic fields needed to observe the quantum Hall effect. From this point of view, graphene is special since it allows the creation of strong pseudomagnetic fields due to st…