Materials Literature
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Porous carbon materials have been prepared from different precursors (anthracite and carbon fibers) by different activation methods (KOH and CO 2 ), obtaining a series of samples with very different porous texture and porous structure. Electrochemical impedance spectroscopy has been used to analyze the kinetics of the…
Abstract A detailed study on the structural deformation of trititanate nanofibers after the adsorption of divalent strontium (Sr) and barium (Ba) cations was conducted by using Raman spectroscopy, X‐ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the Raman bands at 309 cm −1 corresp…
${\text{Ca}}_{3}{\text{Co}}_{2\ensuremath{-}x}{\text{Mn}}_{x}{\text{O}}_{6}$ $(x\ensuremath{\sim}0.96)$ is a multiferroic with spin-chains of alternating ${\text{Co}}^{2+}$ and ${\text{Mn}}^{4+}$ ions. The spin state of ${\text{Co}}^{2+}$ remains unresolved due to a discrepancy between high-temperature x-ray absorptio…
Abstract Poly(3,4‐ethylenedioxythiophene) (PEDOT) solid and hollow microspheres were successfully synthesized by simply adjusting the concentration of 3,4‐ethylenedioxythiophene (EDOT) and the molar ratio of EDOT to ammonium persulfate (APS) (represented by (EDOT)/(APS)), respectively. Microwave absorbing properties o…
Abstract A diphenylamine‐linked bis(oxazoline) ligand with trans ‐diphenyl substitution on the oxazoline rings has been immobilized onto one‐ to three‐generation Fréchet‐type dendrimers and a C 3 ‐symmetric core structure. The catalytic activities and enantioselectivities of these new ligands were tested in the asymme…
Fe 3 Al/Al 2 O 3 composites were prepared by mechanochemical synthesis using a mixture of Fe 2 O 3 , Al and Fe as the starting material. Microwave characteristics were measured in the range 0.1–18 GHz. A reflection loss (RL) exceeding −20 dB in the frequency range 7.2–17.4 GHz was achieved for an absorber of 1.5–2.5 m…
In the previous paper [A. V. Nenashev, F. Jansson, S. D. Baranovskii, R. \"Osterbacka, A. V. Dvurechenskii, and F. Gebhard, Phys Rev. B 81, 115203 (2010)] an analytical theory confirmed by numerical simulations has been developed for the field-dependent hopping diffusion coefficient $D(F)$ in one-dimensional systems w…
We have demonstrated that a thin planar coating with randomly distributed index gradients can create diffuse reflections in front of a planar conducting sheet. This scheme is verified by two-dimensional near-field scanning measurement, in which the randomly gradient index coating is implemented by periodic crossed-I-s…
Abstract NADH electrocatalysts have been an area of study for over 3 decades. Polyazines have been popular electrocatalysts of choice for NADH oxidation for both sensors and biofuel cell applications. However, little is known about the structure and function relationship between these polyazines and their ability for…
Abstract Surface‐induced crystallization of high‐density polyethylene in vertically aligned multiwalled carbon nanotube arrays has been investigated by means of scanning electron microscopy (SEM), wide‐angle X‐ray diffraction (WAXD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). 1‐mm lo…
Plasma enhanced techniques are widely used for synthesis of carbon nanostructures. The primary focus of this paper is to summarize recent experimental and theoretical advances in understanding of single-wall carbon nanotube (SWNT) synthesis mechanism in arcs, and to describe methods of controlling arc plasma parameter…
We report the characteristics of Al-doped zinc oxide (AZO) films prepared by a highly efficient cylindrical rotating magnetron sputtering (CRMS) system for use as a transparent conducting electrode in cost-efficient bulk hetero-junction organic solar cells (OSCs). Using a rotating cylindrical type cathode with an AZO…
Electron relaxation dynamics in CdS−Ag 2 S nanorods have been measured as a function of the relative fraction of the two semiconductors, which can be tuned via cation exchange between Cd 2+ and Ag + . The transient bleach of the first excitonic state of the CdS nanorods is characterized by a biexponential decay corres…
In situ energy-dispersive X-ray diffraction has been used to investigate the synthesis of the recently reported lanthanide hydroxynitrate phases, Ln 2 (OH) 5 NO 3 ·1.5H 2 O (Ln = Y, Er, Yb). Through control of the reaction temperature, three distinct layered phases with differing degrees of hydration ( x = 1 ( 1 ), 1.…
An optical gate switch using Ge2Sb2Te5 phase-change material integrated with a silicon waveguide is reported. The switch is very small (∼2 µm) owing to the large difference in absorption coefficient between the crystalline state and the amorphous state. The prototype switch has been fabricated and successfully switche…
The thermal conductivity of single-walled carbon nanotubes (SWCNTs) under axial stress is studied by nonequilibrium molecular dynamics simulation. The thermal conductivity is found to increase and then decrease with the tube elongation changing from an axially compressed state to a stretched state. The phonon density…
A silica-supported cobalt catalyst has been developed via incipient wetness impregnation for high-yield synthesis of single-walled carbon nanotubes (SWNTs). Co/SiO2-impregnated catalysts have not been observed to be efficient for SWNT synthesis. Using an appropriately chosen precursor, we show that effective catalysts…
Homogeneous Au−Ag alloy nanoparticles have been synthesized in the cavity of horse spleen apoferritin (HSAF) by a diffusion technique. The Au−Ag nanoparticle cores are 5.6−6.3 nm in diameter with narrow size distribution (≤1.0 nm), and their average diameter was gradually increased with an increase in the Ag content.…
In this report, we present a description of the optical and electronic properties of as-deposited, annealed, and chemically treated single-walled carbon nanotube (SWNT) films showing metallic or semiconducting behavior. As-deposited and annealed semiconducting SWNT films were significantly less conductive than metalli…
Organically capped metal nanoparticles are an attractive alternative to more conventional oxide-passivated materials, due to the lower reaction temperatures and the possibility of tuning the organic coating. Sonochemical methods have been used to produce small (∼5 nm average size) air-stable aluminum nanoparticles cap…