Materials Literature
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Abstract In the present work it is shown that low nanoparticle‐loaded polymer composites with improved mechanical performance can be prepared by a conventional melt blending technique in which the nanoparticles are chemically pregrafted by diglycidyl ether of bisphenol‐A (DGEBA). Two composites, each with 2.5 wt% fill…
Densely packed assemblies of single-walled carbon nanotubes (SWCNTs) were characterized by N 2 and CO 2 adsorption techniques. We presented a convenient method for forming densely packed assembly structures of SWCNTs. The SWCNTs were treated with mixtures of HNO 3 /H 2 SO 4 or H 2 O 2 /H 2 SO 4 before and after purifi…
We report a new molecular approach for in situ generation of micron scale, chemically and biochemically functionalized patterns inside three-dimensional, completely enclosed fluidic channels. The formation of chemical patterns is based upon a combination of lipid bilayer self-assembly and UV photopolymerization of pho…
Surface relief gratings have been generated in an azobenzene side chain liquid-crystal polymer using an intensity interference pattern from two coherent laser pulses (532nm and 4ns). We elucidate whether peaks or trenches correspond to the high intensity regions of the interference pattern. For low-energy pulses, peak…
Abstract During service exposure, composite structures may be subjected to local heating under which three‐dimensional temperature gradients may develop with temperature differences that can exceed 150°C. The different thermal expansion that is associated with such temperature gradients can generate a range of thermal…
We present the synthesis and characterization of novel homo- and copolymers containing mono- and dialkylated 3,4-propylenedioxythiophenes with the purpose of creating new π-conjugated polymers to be exploited in the field of polymer electronics and photonics. We show that the large seven-membered dioxepine ring attach…
Abstract Novel soluble copolyimides containing phenyl and hydroxyl pendant groups were synthesized from pyromellitic dianhydride (PMDA) and two diamines, 2,6‐diamino‐4‐phenylphenol (DAPP) and 4,4′‐oxydianiline (ODA), in various ratios via thermal imidization. The structures and physical properties of the copolyimides…
Different carbonyls are formed after CO adsorption at ambient temperature on a Pt-Na-mordenite (Pt-Na-MOR) sample. Pt(3+)(CO)(2) dicarbonyls (nu(s) at 2205 cm(-1) and nu(as) at 2167 cm(-1)) are decomposed without formation of monocarbonyls. The respective mixed-ligand species, Pt(3+)((12)CO)((13)CO), formed after (12)…
One-dimensional La(2)O(3):Eu(3+) nanowires (NWs) and sub-micrometer samples (SMs) were fabricated by a hydrothermal method. Their photoluminescent characteristics were studied and compared. The results indicated that the exciton band in NWs blue-shifted in contrast to SMs. In comparison with the charge transfer (CT) b…
A total-energy electronic-structure calculation is performed to explore energetics and electronic structures of nanotubes adsorbed on metal surfaces. We find that the charge transfer from metal surfaces to the nanotubes takes place depending on both the electronic structures of the adsorbed nanotubes and the work func…
The rapid and accurate determination of bacterial spores in sterile environments (i.e., food preparation areas and hospitals) is of great importance in the minimization of bacteria-driven illnesses. Surface- Enhanced-Raman-Scattering (SERS) is potentially a very sensitive spectroscopic technique for the detection of b…
Expressions for diffusion constants in molten salts have been obtained in terms of the inter-ionic pair potentials and the pair distribution functions. Numerical attempts for diffusion constants in molten alkali halides are carried out and results agreed fairly with those obtained by molecular-dynamics simulation and…
Photonic bandgap (PBG) structures have remarkable optical properties that can be exploited for biosensing applications. We describe the fabrication of 1-D PBG biosensors using porous silicon. The optical properties of porous silicon PBGs are sensitive to small changes of refractive index in the porous layers, which ma…
The eight different classes of single-wall positive-curvature graphitic nanocones are emphasized, characterized, and illustrated. Local transformations among different possible apex-region structures within a common class are investigated, it being noted that there is no short sequence of such transformations which co…
Low molecular mass organogels are nonconventional polymeric structures in which a minute amount of low molecular weight compound can reversibly gelify the whole solution without forming covalent bonds between the monomers. In this article, we demonstrate that certain electron acceptors (taking dinitrobenzoates as mode…
In the present work the electronic spectra of [PtCl(4)](2-), [PtBr(4)](2-), and [Pt(CN)(4)](2-) are studied with a recently proposed relativistic time-dependent density-functional theory (TDDFT) based on the two-component zeroth-order regular approximation and a noncollinear exchange-correlation (XC) functional. The c…
In this work, catalysts of 2 wt % Ni supported on samaria-doped ceria (SDC), gadolinia-doped ceria, and α-Al 2 O 3, as well as SDC-supported Ni−Cu catalysts with 0.5 wt % Ni or Cu and addition of 0.01−0.1 wt % Cu or Ni were prepared. Activity tests for steam reforming of methane over these catalysts were carried out a…
Strontium hydroxyapatite (SrHAp) nanowires with an aspect ratio of several hundreds were synthesized by controlling the growth conditions during a hydrothermal process. In the strontium phosphate system, it was found that the phase evolution changed with pH and that the aspect ratio of SrHAp was affected by the phases…
The optical emission from electronically excited C species in the ablation plume following the short (ns) and ultrashort (fs) UV pulsed laser ablation of graphite is studied. Wavelength, time and spatially resolved imaging of the plume, in background pressures of inert gases such as argon and helium, is performed. Ana…
A new approach is suggested to explain the Peltier effect. It assumes that the Peltier effect is not an isothermal effect. The approach is based on the occurrences of induced thermal fluxes in a structure which consists of two conducting media, through which a dc electric current flows. These induced thermal diffusion…