Materials Literature
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The industrial use of black tourmaline is based on the pyroelectricity, emission of far infrared radiation, adsorption of ions, release of negative air ions, and influence on biologic activity. The crystal structure of schorl was analyzed through a virtual three dimensional hard ball model and related to these propert…
The surface-enhanced Raman scattering (SERS) of p -benzoquinone (Q) adsorbed on silver nanoclusters (Ag n ) reported by Tripathi ( J. Am. Chem. Soc. 2003, 125, 1179) is analyzed by means of high-level ab initio calculations. CASPT2 energies of the Ag 2 −Q model confirm the charge transfer character of the adsorption (…
Probing the piezoelectricity and ferroelectricity of thin film devices and nanostructures quantitatively has proven to be challenging because the appropriate experimental tools have had a limited range of usefulness. We show here that the piezoelectric and ferroelectric properties of epitaxial thin films can be measur…
The electronic density of states and magnetic properties were investigated by tunneling spectroscopy and SQUID, respectively, for a series of 3d transition-metal (Mn, Fe, Co)-doped ZnO. By tunneling spectroscopy an additional density of states was observed in Mn- and Co-doped ZnO adjacent to the top of the valence ban…
The rich phase behavior of surfactants can be exploited to design materials with a given desired structure and properties. One example includes amino functionalized mesoporous silicas, which can be used in different environmental applications, including removal of heavy metals from water and CO2 separation and purific…
Abstract Soap‐free emulsion polymerization of methyl methacrylate (MMA) in the aqueous suspension of montmorillonite (MMT) was able to fabricate the exfoliated MMT/PMMA nanocomposite latex. Because neither MMA nor substantial quantity of potassium persulfide (KPS) initiator could be individually absorbed into the inte…
The stability, processability and electrical and optical properties of polyaniline (PANI) have led to its being investigated for use in a wide variety of applications. Much of the initial work centered on the wide range of conductivity that can be achieved, covering some 20 orders of magnitude. Although (PANI) can ind…
Abstract Polyamide 12/Trisilanolphenyl‐POSS (PA 12/POSS) composites were prepared via melt‐compounding. The effect of polyhedral oligomeric silsesquioxane (POSS) on crystalline structure and crystalline transition of PA 12 was investigated by wide‐angle X‐ray diffraction (WAXD) and real time fourier transform infrared…
Exact expressions for the polarization profiles induced by an external electric field and the dielectric susceptibilities in the paraelectric phase were obtained for a one-dimensional ferroelectric superlattice on the basis of the Ginzburg-Landau theory. The superlattice is composed of a ferroelectric of thickness L 1…
Abstract The new fluctuation‐assisted mechanism for nucleation and crystallization in the isotactic polypropylene/poly(ethylene‐ co ‐octene) alloy has been studied. We found that the liquid–liquid phase separation (LLPS) had a dominant influence on the crystallization kinetics through the nucleation process. After LLP…
Hydroxyl (OH) is identified and characterized on the Ni(111) surface by high-resolution electron energy loss spectroscopy. We find clear evidence of stretching, bending, and translational modes that differ significantly from modes observed for H(2)O and O on Ni(111). Hydroxyl may be produced from water by two differen…
The mechanisms and dynamics of quenching of a photoexcited free base porphyrin (Fb*) covalently linked to a nearby oxidized zinc porphyrin (Zn(+)) have been investigated in a set of five dyads using time-resolved absorption spectroscopy. The dyads include porphyrins joined at the meso-positions by a diphenylethyne lin…
Abstract 2,3,4,5,6‐Pentafluorostyrene (PFS) was copolymerized with 1‐vinylnaphathalene (1VN) in bulk by radical copolymerization at 25 °C (r 1VN r PFS = 0.070) using t ‐butylperoxy pivalate as the inititator, at 70 °C ( r 1VN r PFS = 0.11) using benzyol peroxide as the initiator, and at 120 °C ( r 1VN r PFS = 0.28) us…
The production of multi-walled carbon nanotubes (MWNTs) by the catalytic chemical vapour deposition (CCVD) method was examined over a series of Ni–Co/La 2 O 3 catalysts with methane as the carbon source. The catalyst composition and the reaction conditions were optimized by analyzing the effluent gas with gas chromato…
A simple strategy was developed for preparing stable Ag nanoparticles supported on carbon by carbonizing Ag(+)/acrylic acid type ion-exchange resin complexes under N(2) atmosphere. The products were characterized by x-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (T…
We examine the application of an oscillating cell in combination with right-angle Raman scattered light collection geometry for quantitative Surface Enhanced (Resonance) Raman Scattering (SER(R)S) measurements from nano-colloidal noble metal solutions. This excitation/collection Raman configuration allows specific SER…
In this work structural, magnetic and electrical properties of R(0.7)Ca(0.3)Mn(0.95)Fe(0.05)O(3) (R = Pr and Nd) perovskite manganites are presented. Structural characterization of these compounds shows that both have orthorhombic (Pbnm) phase. The Mössbauer spectra show clear evidence of the local structural distorti…
YVO3 exhibits a well separated sequence of orbital and spin order transitions at 200 and 116 K, followed by a combined spin-orbital reorientation at 77 K. It is shown that the spin order can be destroyed by a sufficiently strong optical pulse within less than 4 ps. In contrast, the orbital reordering transition from C…
Abstract The binding energy of heavy hole excitons in a spherical GaAs–Ga 1– x Al x As quantum dot under isotropic hydrostatic pressure was calculated using the Hylleraas coordinate system and a variational approach within the approximation of the effective mass. The influences of hydrostatic pressure on the effective…
We studied the effects of thermal treatment on the expansive characteristics of a coil-within-coil Poly(L-lactic acid) (PLLA) fiber stent developed at our institution to improve its mechanical performance and reproducibility. Following fabrication, furled stents were thermally treated at 62 degrees C for 25 min. The m…