Materials Literature
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This work reports the first example to synthesize squarely mesoporous and functional nanocomposites by self-directed assembly of porphyrin-bridged silsesquioxane. Due to the formation of robust silica networks around conjugated porphyrin moieties, the resultant mesoporous materials exhibit excellent optoelectronic pro…
There has been limited development in catalyst carriers for magnetic separations where superparamagnetic nanoparticles of a high saturation magnetization with no coercivity are required to isolate expensive catalyst reagent that are subjected to repeated magnetic cycles. By using simple stepwise layer-by-layer nanoche…
We develop a classical theory of electron confinement in conducting nanoparticles. The theory is used to compute the nonlinear optical response of the nanoparticle to a harmonic external field.
Well-defined arrays of titania nanoposts are generated by using high aspect-ratio cylindrical nanopore templates. The simple and controllable fabrication scheme of the nanoporous templates makes them very attractive for creating well-defined nanostructures out of a variety of functional materials. The arrays of titani…
Polarization-resolved hyper-Rayleigh scattering experiments are reported for mixed suspensions of a constant concentration of 4-(4-dihexadecylaminostyryl)- N -methylpyridinium iodide (DiA), a cationic amphiphilic compound with a strong quadratic hyperpolarizability, and varying concentrations of sodium dodecyl sulfate…
The hydrogen storage capacities of the recently synthesized tetraindenocoranulene C 44 H 18 and pentaindenocorannulene C 50 H 20 have been investigated and compared with those of corannulene and C 60 . The results for the physisorption of a single H 2 on the concave side indicate that the adsorption energies ( E ads )…
In this work we present the fabrication and characterization of immunosensors based on polystyrene (PS)-multiwalled carbon nanotube (MWCNT) composites. The electrochemical properties of the sensors have been investigated and show that the surface area is increased upon addition of the MWCNT-PS layer. Furthermore, a pl…
Oleic acid is removed from the surface of PbS nanocrystals, leading to the formation of densely packed nanorods. The nanorods are sculptured using focused electron-beam irradiation to control the shape, size, and tip morphology. This sculpturing technique has the potential for the production of tailored tips for scann…
Oxidation and reduction of Rh species on Rh/CeO 2 /SiO 2 catalyst were promoted by the presence of CeO 2 as indicated from the comparison of the profiles of the temperature-programmed oxidation (TPO) and reduction (TPR) of Rh/CeO 2 /SiO 2 and Rh/SiO 2 . In situ quick scanning X-ray absorption fine structure (QXAFS) du…
Abstract Polytetrafluoroethylene (PTFE) composites filled with Sr 2 Ce 2 Ti 5 O 16 ceramic were prepared by a powder processing technique. The structures and microstructures of the composites were investigated by X‐ray diffraction and scanning electron microscopy techniques. Differential scanning calorimetry showed th…
There is currently a great deal of interest in the invisibility cloaks recently proposed by Pendry et al that are based on the transformation approach. They obtained their results using first-order transformations. In recent papers, Hendi et al and Cai et al considered invisibility cloaks with high-order transformatio…
Abstract Surface‐enhanced Raman spectroscopy (SERS) has the potential to make a significant impact in biology research due to its ability to provide information orthogonal to that obtained by traditional techniques such as mass spectrometry (MS). While SERS has been well studied for its use in chemical applications, d…
Magnetic properties and magnetic entropy changes in spinels (Cd,M)Cr2S4 with M=Cu or Fe have been studied. The saturation moments per formula unit are about 4.77μB for Cd0.8Cu0.2Cr2S4 and 4.41μB for Cd0.7Fe0.3Cr2S4. Magnetic transition in Cu- and Fe-doped samples are of second order in nature, and their Curie temperat…
Abstract We present the first study and results on the preparation and characterization of montmorillonite clay filler based polymer blend nanocomposites of the miscible poly(phenylene oxide)/polystyrene blend. Intercalated nanocomposites, prepared by a melt‐processing method with 2–6 wt % commercially available organ…
The additions of trace amounts of small interstitial atoms (carbon, boron, and nitrogen) to Fe–Ga (Galfenol) alloys have a small but beneficial effect on the magnetostriction of Fe–Ga alloys especially at high Ga compositions. The saturated magnetostrictions [(3∕2)λ100’s] of both slow cooled and quenched single crysta…
The interaction of water vapor on clean diamond (100) has been studied using ultraviolet photoemission spectroscopy (UPS), X-ray photoemission spectroscopy (XPS), X-ray-absorption near-edge structure (XANES) spectroscopy, and high-resolution electron energy loss spectroscopy (HREELS). It is shown that water dissociate…
For molecular substances exhibiting harmonic and nonharmonic vibrations, we present a first-principles approach to predict enthalpy differences between phases at finite temperatures, including solid-solid and melting. We apply it to the complex hydride LiBH4. Using ab initio molecular dynamics, we predict a structure…
Abstract The mass transport rates to planar electrodes, in a series of electrochemical laboratory filter‐press reactors were measured to quantify the effects of the inlet and outlet design manifolds on the fluid flow. In small reactors, entrance/exit effects are especially important due to the localized generation of…
The structures of cationic rhodium carbonyl cluster compounds containing one to six Rh atoms are established by infrared multiple photon dissociation spectroscopy. Comparison with their well-known neutral analogues reveals that ionization of the neutral compounds destabilizes bridge bound CO ligands in Rh 2 (CO) 8 and…
Abstract In this article, a series of hybrid materials consisted of epoxy resin matrix and well‐dispersed amino‐modified silica (denoted by AMS) nanoparticles were successfully prepared. First of all, the AMS nanoparticles were synthesized by performing the conventional acid‐catalyzed sol–gel reactions of tetraethyl o…