Materials Literature
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Samples of carboxy methyl cellulose, subjected to ion exchange with different metal ions (Cu, Ni, Co, Fe, and Ca), were pyrolyzed in the temperature range of 300−1000 °C to obtain chars that were doped with metal species. X-ray diffraction (XRD) profiles of these chars showed that the metal species in the char existed…
We demonstrate that in random-stacking hard-sphere colloidal crystals the stacking disorder not only exists in the direction perpendicular to the close-packed layers, but also extends in the lateral direction. The existence of such in-plane stacking disorder is suggested by a recent observation of lateral broadening o…
The preparation of binary materials based on Ta 2 O 5 −ZrO 2 by a sol−gel method and with a wide range of compositions is reported (Ta 2 O 5 nominal content from 4 to 74% w/w). Materials were characterized by X-ray diffraction, and infrared and Raman spectroscopy. Their acidic characteristics were evaluated from the m…
The electronic structure characteristics of P (4 × 4) or Ag 12 O 6 /Ag(111) overlayer structure and its catalysis for ethylene epoxidation are determined using Density Functional Theory (DFT). The adsorption characteristic of ethylene is obtained according to the partial density of state (PDOS) of Ag 12 O 6 /Ag(111) o…
Despite sufficient spatial resolution and routine operation, traditional electron microscopy (SEM and TEM) of polymer blend morphologies is limited to two dimensions (2D) and often requires tedious sample preparation. We have used a powerful X-ray imaging technique to visualize the morphology of polymer blends in thre…
The VUV $4{f\phantom{\rule{0.2em}{0ex}}}^{n\ensuremath{-}1}5d\text{\ensuremath{-}}4{f\phantom{\rule{0.2em}{0ex}}}^{n}$ luminescence and luminescence excitation spectra of ${\mathrm{Gd}}^{3+}$ $(n=7)$ in ${\mathrm{LiGdF}}_{4}$, ${\mathrm{GdF}}_{3}$, ${\mathrm{LiYF}}_{4}:{\mathrm{Gd}}^{3+}$, and ${\mathrm{YF}}_{3}:{\mat…
Abstract The electrospinning method has been employed to fabricate ultrafine nanofibers of ultrahigh‐molecular‐weight polyethylene for the first time with a mixture of solvents of different dielectric constants and conductivities. The possibility of producing highly oriented nanofibers from ultrahigh‐molecular‐weight…
OBJECTIVE: Convection-enhanced delivery is a promising approach to intracerebral drug delivery in which a fluid pressure gradient is used to infuse therapeutic macromolecules through an indwelling catheter into the interstitial spaces of the brain. Our purpose was to test the hypothesis that hyperintense signal change…
In this work, the effects of chemical treatment of polyimide films were studied by FT-IR, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and contact angles. The adhesion characteristics of the films were also investigated in the peel strengths of polyimide/aluminum films. The increases of surfac…
An optical syringe for targeted delivery of a substrate in vivo has been developed on the basis of the 3,5-dibromo-2,4-dihydroxycinnamic caging group. Two-photon excitation of the caged compound uncages the substrate (ethanol in the scheme) and forms a coumarin whose fluorescence allows the concentration of released s…
Polyacrylamide−metal sulfide (Ag 2 S, Cu 2 S, HgS) nanocomposites with metal sulfide nanoparticles homogeneously dispersed in the polyacrylamide (PAM) matrix have been successfully synthesized using corresponding metal salt, sulfur powder, and acrylamide monomer (AM) in ethylene glycol (EG) by microwave heating. This…
Since many potential drugs are poorly water soluble, there is a high demand for solubilization agents. Here, we describe the synthesis of dendritic core-shell-type architectures based on hyperbranched polyglycerol for the solubilization of hydrophobic drugs. Amphiphilic macromolecules containing hydrophobic biphenyl g…
The frequency degenerate and nondegenerate two-photon absorption (2PA) spectra of direct band gap semiconductor quantum dots are studied. Measuring the spectra for both cases in samples of CdSe and CdTe with different quantum dot sizes and size distributions, we observe that the 2PA spectra and the 2PA coefficient are…
We have studied the statistics of plastic rearrangement events in a simulated amorphous solid at T=0. Events are characterized by the energy release and the ``slip volume'', the product of plastic strain and system volume. Their distributions for a given system size $L$ appear to be exponential, but a characteristic e…
The electromigration-induced shape evolution of two-dimensional vacancy islands on a crystal surface is studied using a continuum approach. We consider the regime where mass transport is restricted to terrace diffusion in the interior of the island. In the limit of fast attachment/detachment kinetics a circle translat…
We study the anomalous Hall conductivity in spin-polarized, asymmetrically confined two-dimensional electron and hole systems, focusing on skew-scattering contributions to the transport. We find that the skew scattering, principally responsible for the extrinsic contribution to the anomalous Hall effect, vanishes for…
We report on organic field-effect transistors with unprecedented resistance against gate bias stress. The single crystal and thin-film transistors employ the organic gate dielectric Cytop(TM). This fluoropolymer is highly water repellent and shows a remarkable electrical breakdown strength. The single crystal transist…
The dynamic behavior of the slip length in a fluid flow confined between atomically smooth surfaces is investigated using molecular dynamics simulations. At weak wall-fluid interactions, the slip length increases nonlinearly with the shear rate provided that the liquid/solid interface forms incommensurable structures.…
We report on how different cluster deposition regimes can be obtained and observed by in situ Scanning Tunneling Microscopy (STM) by exploiting deposition parameters in a pulsed laser deposition (PLD) process. Tungsten clusters were produced by nanosecond Pulsed Laser Ablation in Ar atmosphere at different pressures a…
The spin diffusion/transport in $n$-type (001) GaAs quantum well at high temperatures ($\ge120$ K) is studied by setting up and numerically solving the kinetic spin Bloch equations together with the Poisson equation self-consistently. All the scattering, especially the electron-electron Coulomb scattering, is explicit…