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The nanocomposites of SO3H-hollow-nanosphere and chiral amine for asymmetric aldol reaction
The nanocomposites formed by SO3H-hollow-nanospheres and chiral amines are highly efficient catalysts for the direct asymmetric aldol reaction of cyclohexanone and 4-nitrobenzaldehyde. The catalyst showed 91% yield with 96% ee under optimized reaction conditions. SO3H-hollow-nanospheres were synthesized by oxidation o…
SILICIFICATION OF HIGHER PLANTS IN GEOTHERMALLY INFLUENCED WETLANDS: YELLOWSTONE AS A LOWER DEVONIAN RHYNIE ANALOG
Abstract Silicification of higher plants associated with active, alkali-chloride hot springs in Yellowstone National Park, Wyoming, USA, occurs dominantly in areas of geothermally influenced wetlands. Plants grow in an environment with many of the characteristics of an oligosaline marsh and are subjected to brackish s…
Colloidal approach for tungsten oxide nanorod-based electrochromic systems with highly improved response times and color efficiencies
Tungsten oxide nanorod-based electrochromic systems have been developed via a colloidal approach and a highly improved response time and color efficiency have been achieved due to the nanosize effect.
Shear-induced fragmentation of laponite suspensions
Simultaneous rheological and velocity profile measurements are performed in a smooth Couette geometry on laponite suspensions seeded with glass microspheres and undergoing the shear-induced solid-to-fluid (or yielding) transition. Under these slippery boundary conditions, a rich temporal behaviour is uncovered, in whi…
The influence of crystal packing on the solid state fluorescence behavior of alkyloxy substituted phenyleneethynylenes
The study reports the solid state photophysical properties of a series of alkyloxy-substituted oligo(phenyleneethynylene)s, methoxy to hexyloxy, supported by a detailed analysis of molecular packing obtained from single crystal X-ray diffraction data. While the emission peaks are highly red shifted (by as much as 114…
Aggregation-induced emission of dendritic phosphole oxides
Dendritic phosphole oxides display intense emission in the aggregate and solid states, but no emission in solution, because the intramolecular rotational motions of the peripheral dendritic groups linked to the phosphole oxide core are restricted. This unique spectroscopic feature is ascribed to an aggregation-induced…
Reversible luminescence switching of NaYF4:Yb,Er nanoparticles with controlled assembly of gold nanoparticles
Upon the tunable surface plasmon band of the pH-induced reversible assembly of gold nanoparticles mediated by cysteine, the manipulation of green and red upconversion emission, and the switching of the red emission of the NaYF(4):Yb,Er nanoparticles have been achieved in a facile and reproducible way.
BSA-Modified Polyethersulfone Membrane: Preparation, Characterization and Biocompatibility
A polyethersulfone (PES) membrane was modified by blending with a co-polymer of acrylic acid (AA) and N-vinyl pyrrolidone (VP), followed by immobilization of bovine serum albumin (BSA) onto the surface. The scanning electron microscopy results showed that PES had good miscibility with the co-polymer. X-ray photoelectr…
Green catalysis for selective CO oxidation in hydrogen for fuel cell
Preferential oxidation of carbon monoxide in excess hydrogen (PROX) is one of the key processes for the production of clean hydrogen fuel for the polymer electrolyte membrane fuel cell (PEFC). Development of highly active and selective catalysts is among the most challenging works for decades. Platinum-based catalysts…
Activity Enhancement of Dense Strontium-Doped Lanthanum Manganite Thin Films under Cathodic Polarization: A Combined AES and XPS Study
La 1 − x Sr x Mn O 3 cathodes used in solid oxide fuel cells have exhibited enhanced catalytic activity after polarization; however, the origin of this enhancement is not understood. In this study, dense La 0.8 Sr 0.2 Mn O 3 thin-film microelectrodes fabricated by sputtering were cathodically or anodically polarized,…
Facile molecular design of hybrid functional assemblies with controllable transport properties: mesoporous films meet polyelectrolyte brushes
We showed for the first time how to tailor the permselectivity of mesoporous thin films by changing the electrostatic environment of the nanopores through the covalent functionalization with polyelectrolyte brushes.
Raman-Scattering Spectroscopy of Epitaxial Graphene Formed on SiC Film on Si Substrate
By conducting a 1200°C vacuum annealing of a 3C-SiC(111) ultrathin film preformed on a Si(110) surface, we have succeeded in forming a graphene layer on a Si substrate. Raman-scattering spectrum from this surface presents a distinct 2D band, whose deconvolution into four subcomponents indicates that the film mostly co…
Eu[sup 2+], Ce[sup 3+] Luminescence and Ce[sup 3+]→Eu[sup 2+] Energy-Transfer Studies on Sr[sub 2]LiSiO[sub 4]F: A White Light-Emitting Phosphor
luminescence is studied in , and the emission spectrum shows an intense and broad green emission band with two peak maxima (475 and 505 nm). The two emission bands are due to present in the two crystallographic distinct Sr sites in the host lattice. luminescence is studied in and shows a broad and bright blue emission…
Dielectric properties of Li2O-3B(2)O(3) glasses
The frequency and temperature dependences of the dielectric constant and the electrical conductivity of the transparent glasses in the composition Li2O–3B2O3 were investigated in the 100 Hz–10 MHz frequency range. The dielectric constant and the loss in the low frequency regime were electrode material dependent. Diele…
Luminescent Properties and Energy Transfer of Green-Emitting Ca[sub 3]Y[sub 2](Si[sub 3]O[sub 9])[sub 2]:Ce[sup 3+],Tb[sup 3+] Phosphor
Green-emitting phosphors of have been synthesized by solid-state reaction. The luminescence properties were characterized by photoluminescence (PL) and photoluminescence excitation spectra, reflection spectra, and a detection system using an integrating sphere equipped with a spectrofluorometer. With co-doping as a se…
Experimental Study of Energy-Minimizing Point Configurations on Spheres
In this paper we report on massive computer experiments aimed at finding spherical point configurations that minimize potential energy. We present experimental evidence for two new universal optima (consisting of 40 points in 10 dimensions and 64 points in 14 dimensions), as well as evidence that there are no others w…
Nuclear targets of photodynamic tridentate ruthenium complexes
Octahedral ruthenium complexes, capable of photodynamic singlet oxygen production at near 100% efficiency, were shown to cause light-dependent covalent crosslinking of p53 and PCNA subunits in mammalian cells and cell lysates. Azide, a singlet oxygen quencher, greatly reduced the p53 photocrosslinking, consistent with…
Purification of carbon nanotubes by dynamic oxidation in air
We describe a new approach to the purification of single-walled carbon nanotubes (SWCNTs), based on the selective oxidation of carbonaceous impurities by heating at a constantly increasing temperature (i.e. dynamic oxidation) in air. Using UV-VIS-NIR spectroscopy, Raman spectroscopy and transmission electron microscop…
Synthesis of various crystalline gold nanostructures in water: The polyoxometalate β-[H4PMo12O40]3− as the reducing and stabilizing agent
This paper reports a facile, one-pot, room-temperature synthesis, in water, of various Au nanostructures using, as reducing agent, the mixed-valence polyoxometalate β-H3[H4P(MoV)4(MoVI)8O40]3−. By modifying the initial concentrations of the polyoxometalate and chloroauric acid, the morphology of the synthesized Au nan…