Materials Literature
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A long-standing limitation in tissue engineering has been the dogmatic reliance on synthetic scaffolds for building tissues with significant mechanical functions despite their deleterious effects (inflammation, scarring, infection, etc.). Tissue engineering by self-assembly (TESA) is a novel approach that relies on th…
Various single-crystalline Ag nanostructures including dendrites, dendritic flowers, and cactus-like rods have been successfully synthesized in high yield through a simple, facile, cost-effective method based on the galvanic replacement reaction. The products were characterized by X-ray powder diffraction (XRD), scann…
Abstract Corrosion behavior and the hygroscopic properties of solid ammonium chloride (NH4Cl) salt were investigated. This study was conducted to determine the root cause of significant corrosion caused by NH4Cl salt deposition in reactor-effluent streams in hydroprocessing units. Corrosion and water absorption tests…
We derive formal expressions of time-dependent energy and heat currents through a nanoscopic device using the Keldysh nonequilibrium Green function technique. Numerical results are reported for a metal-dot-metal junction where the dot level energy is abruptly changed by a step-shaped voltage pulse. Analytical linear r…
The reduction-oxidation cycling of the nickel-based oxides in composite solid oxide fuel cells and battery electrodes is directly related to cell performance. A greater understanding of nickel redox mechanisms at the microstructural level can be achieved in part using transmission x-ray microscopy (TXM) to explore mat…
A new shape-memory nanocomposite that exhibits rapid electrical actuation capabilities is fabricated by incorporating self-assembly multiwalled carbon nanotube (MWCNT) nanopaper and magnetic CNTs into a styrene-based shape-memory polymer (SMP). The MWCNT nanopaper was coated on the surface to give high electrical cond…
The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of $Bi_{0.5}(Na_{0.82}K_{0.18})_{0.5}Ti_{1-x}Ta_xO_3$ ceramics has been investigated. The Ta doping resulted in a transition from coexistence of ferroelectric tetragonal and rhombohedral phases to an electrostrictive ps…
The electronic and structural properties of the oxygen vacancy (VO) in cubic BaTiO3 are studied using first-principles calculations based on a hybrid Hartree–Fock density functional approach. Our calculations identify the double shallow donor behavior of VO, indicating its contribution to the n-type conductivity. In a…
We analyze the inelastic electron-electron scattering in undoped graphene within the Keldysh diagrammatic approach. We demonstrate that finite temperature strongly affects the screening properties of graphene, which, in turn, influences the inelastic-scattering rates as compared to the zero-temperature case. Focusing…
Monodispersed palladium nanoparticle catalysts were synthesized by atomic layer deposition (ALD) using alternating exposures of Pd hexafluoroacetylacetonate (Pd(hfac) 2 ) and formalin on an alumina support. The size of the ALD Pd particles could be tuned by adjusting the preparation conditions. Conventional ALD condit…
Using the ab initio approaches, the comparative stability, structural, elastic, and electronic properties of three polymorphs of the superconducting disilicide YIr2Si2, which differ in the atomic configurations of [Ir2Si2] (or [Si2Ir2]) blocks, were examined. For these YIr2Si2 polymorphs, the optimized structural data…
We report a systematic investigation on the high-temperature thermoelectric response in a typical filling-control Mott transition system La${}_{1\ensuremath{-}x}$Sr${}_{x}$VO${}_{3}$. In the vicinity of the Mott transition, incoherent charge transport appears with increasing temperature and the thermopower undergoes t…
BiFeO 3 / Nb – SrTiO 3 heterojunctions with room-temperature resistance switching (RS) and white-light photovoltaic (PV) effects were fabricated by pulsed laser deposition. The current-voltage characteristics of these heterojunctions show a good rectifying property with a large rectifying ratio of 104. Nonvolatile bip…
We report on the electronic properties of superlattices composed of three different antiferromagnetic insulators, NdMnO3/SrMnO3/LaMnO3 grown on SrTiO3 substrates. Photoemission spectra obtained by tuning the x-ray energy at the Mn 2p→3d edge show a Fermi cut-off, indicating metallic behavior mainly originating from Mn…
Freestanding two-dimensional (2D) few-layer graphene was formed through laser exfoliation of highly ordered pyrolytic graphite, using a pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG) laser. Graphene sheets of several nanometers in thickness and micrometers in size were obtained. The laser exfoliation process…
Silver nanoparticles (AgNPs) are widely used which may result in environmental impacts, notably within aquatic ecosystems. As estuarine sediments are sinks for numerous pollutants, but also habitat and food for deposit feeders such as Nereis diversicolor, ingested sediments must be investigated as an important route o…
We have probed the low-temperature magnetic behavior of the ordered spin-ice material Tb${}_{2}$Sn${}_{2}$O${}_{7}$ through ac magnetic susceptibility measurements of both the pure material and samples with small percentages of Ti substituted on the Sn sublattice. We observe a clear signature for the previously report…
We investigate the properties of doping-induced metal-insulator transition in GaN:Si by means of electron spin resonance and the Hall effect. While increasing the doping concentration, Si-related bands are formed below the bottom of the GaN conduction band. The ${D}^{0}$ band of single-occupied Si donor sites is cente…
With single-crystal x-ray diffraction studies, we compare the structures of three samples showing optimal superconductivity: ${\mathrm{K}}_{0.775(4)}{\mathrm{Fe}}_{1.613(1)}{\mathrm{Se}}_{2}$, ${\mathrm{K}}_{0.737(6)}{\mathrm{Fe}}_{1.631(3)}{\mathrm{Se}}_{2}$, and ${\mathrm{Cs}}_{0.748(2)}{\mathrm{Fe}}_{1.626(1)}{\mat…
We study the singlet-triplet relaxation due to the spin-orbit coupling assisted by the electron-phonon scattering in two-electron SiGe/Si/SiGe double quantum dots in the presence of an external magnetic field in either Faraday or Voigt configuration. By explicitly including the electron-electron Coulomb interaction an…