Materials Literature
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The anisotropy of the nuclear spin-lattice relaxation rate $1/{T}_{1}$ of $^{75}\text{A}\text{s}$ was investigated in the iron pnictide $\text{LaFeAs}({\text{O}}_{1\ensuremath{-}x}{\text{F}}_{x})$ ($x=0.07$, 0.11, and 0.14) as well as LaFeAsO. While the temperature dependence of the normal-state $1/{T}_{1}T$ in the su…
We investigate the quasiparticle (QP) relaxation and low-energy electronic structure in undoped SmFeAsO and near-optimally doped ${\text{SmFeAsO}}_{0.8}{\text{F}}_{0.2}$ single crystals--exhibiting spin-density wave (SDW) ordering and superconductivity, respectively--using pump-probe femtosecond spectroscopy. In the u…
The “Four Twin Laws of Calcite”, expressed by their twin planes (10.4, 01.8, 01.2 and 0.01, hexagonal frame) have been investigated in order to assess the structure of the interfaces between twinned individuals. Athermal twinning and adhesion energies were evaluated by calculations using empirical potential functions:…
Abstract High transparent and UV‐shielding poly (styrene)‐co‐poly(methyl methacrylate) (PS‐PMMA)/zinc oxide (ZnO) optical nanocomposite films were prepared by solution mixing using methyl ethyl ketone (MEK) as a cosolvent. The films were characterized by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy…
We have studied the change in the magnetic properties produced on highly oriented pyrolytic graphite samples by irradiation of H, C, and N ions in the mega-electron-volt energy range. The use of specially made sample holders for the magnetic measurements provided high reproducibility allowing us to obtain directly the…
Spin-polarized density functional theory with the inclusion of on-site Coulomb correction (DFT+U) calculation is carried out to study the oxygen vacancy and migration of Ce(1-x)Zr(x)O(2) in a series of Ce/Zr ratios. Substitution of Zr(4+) ion in CeO(2) creates activated oxygen in Ce(1-x)Zr(x)O(2), leading to higher ox…
First principles calculations on an Al, Ti, Mn, and Ni doped MgH 2 (110) surface were carried out to study the influence of dopants on the dehydrogenation properties of MgH 2 . It was shown that Al prefers to substitute for an Mg atom, whereas Ti, Mn, and Ni prefer to occupy interstitial sites. The dopants used differ…
We study the solubility and dispersibility of as-produced and purified HiPco single-walled carbon nanotubes (SWNTs). Variation in specific operating conditions of the HiPco process are found to lead to significant differences in the respective SWNT solubilities in oleum and surfactant suspensions. The diameter distrib…
We present room temperature scanning tunneling microscopy and photoemission spectroscopy studies of water adsorption on the Zn-terminated ZnO(0001) surface. Data indicates that the initial adsorption is dissociative leaving hydroxyl groups on the surface. At low water coverage, the adsorption occurs next to the oxygen…
Transition metals, including Co, Cr, Ni and Mn, were doped into multiferroic Bi 0.8 La 0.2 Nb 0.01 Fe 0.99 O 3 samples that were fabricated by a solid state reaction. X-ray diffraction results show that only the Mn-doped sample did not contain any impurity phases, while the other transition metal dopants destroyed the…
Abstract Poly(vinyl acetate) (PVAc) loaded bismuth oxide (Bi 2 O 3 ) nanowires was successfully prepared at low temperature and ambient pressure. X‐ray diffraction and transmission electron microscopy were used to characterize the final product. It was found that Bi 2 O 3 nanowires were formed and the diameter of the…
Abstract Polymers containing metal oxides of nanoscale dimensions have attracted attention because of their unique properties and new findings concerning technological applications. Polymers containing vanadium pentoxide (V 2 O 5 ) have attracted our interest in respect of their potential applications in memory and sw…
Abstract We suggest a new reinforcing mechanism for carbon nanotube (CNT)/rubber compounds, based on a comparison of CNT reinforcement of natural rubber (NR) with that by carbon black (CB). The mechanical properties of the NR/CNT compounds were significantly higher, but the amount of bound rubber, an indication of the…
Solvent mixtures can be used to thermodynamically suppress solvate formation as a competing reaction in solution-based cocrystallization experiments. This has been demonstrated successfully for the cocrystallization of carbamazepine and saccharin in the presence of up to nine different solvate-forming solvents and was…
Single-molecule spectroscopy has opened exciting new realms of research, allowing the exploration of molecular dynamics within heterogeneous media, from live cells to chemical catalysts. Raman spectroscopy of individual molecules is particularly useful because it may provide more detailed information than is available…
Based on measurements of angle resolved photoemission, we report that in the Pb/Ge(111)- \sqrt{3}x\sqrt{3} R30^\circ structure, in addition to three bands resembling Ge heavy hole (HH), light hole (LH), and split off (SO) bulk band edges, a fourth dispersive band resembling the non split off (NSO) band is found near t…
We performed all-atom molecular dynamics simulations studying the partition of ions and the ionic current through the bacterial porin OmpF and two selected mutants. The study is motivated by new interesting experimental findings concerning their selectivity and conductance behaviour at neutral pH. The mutations consid…
Nearly monodispersed FeNi 3 submicrometre spheres with an average diameter of 220 nm were synthesized by a simple low temperature reduction method. SiO 2 @FeNi 3 core–shell structured submicrometre spheres with 25 nm thick SiO 2 shell were then fabricated by a sol–gel process. A significant enhancement of electromagne…
Using a metal-semiconductor-metal back-to-back Schottky contacted ZnO microwire device, we have demonstrated the piezoelectric effect on the output of a photocell. An externally applied strain produces a piezopotential in the microwire, which tunes the effective height of the Schottky barrier (SB) at the local contact…
We revisit the question of quantum dynamics of electrons on the off-diagonal Fibonacci tight-binding model. We find that typical dynamical quantities, such as the probability of an electron to remain in its original position as a function of time, display log-periodic oscillations on top of the leading-order power-law…