Materials Literature
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CoFe/FeMn, FeMn/CoFe bilayers and CoFe/FeMn/CoFe trilayers were grown in magnetic field and at room temperature. The exchange bias field $H_{eb}$ depends strongly on the order of depositions and is much higher at CoFe/FeMn than at FeMn/CoFe interfaces. By combining the two bilayer structures into symmetric CoFe/FeMn($…
Si(001)-(2$\times$1) surface is one of the many two-dimensional systems of scientific and applied interest. It has two surface state bands (1) anti-bonding pi* band, which has acceptor states and (2) bonding pi band, which has donor states. Due to its asymmetric dimer reconstruction, transport through this surface can…
The first-principles full-potential linearized augmented plane-wave method based on density functional theory is used to investigate electronic structure and magnetic properties of hypothetical binary compounds of I$^{A}$ subgroup elements with nitrogen (LiN, NaN, KN and RbN) in assumed three types of cristalline stru…
Site-selective and narrowed luminescence and excitation spectra in the region of the (2)E <-- (4)A 2 transitions are reported for single crystals of Al(acac) 3/Cr(III) and Al(3-Br-acac) 3/Cr(III) (where acac is acetylacetonate). The R 2 line is pronounced in the brominated system and displays a comparable oscillator s…
The interaction between the water-soluble anionic fluorescence conjugated polyelectrolytes PPESO 3 (poly[2,5-bis(3-sulfonatopropoxy)-1,4-phenylethynylene-alt- 1,4-poly(phenylene ethynylene)]) and various surfactants has been studied in aqueous solution by UV-vis absorption spectra and fluorescence spectra. With the ad…
Films of nickel tetrasulfophthalocyanine and - p-phenylporphyrin (NiTSPc and NiTSPP, respectively) were obtained by repetitive cyclic voltammetry (RCV) of the 1 mM complex in aqueous solution, while films of the water-insoluble nickel tetraaminophthalocyanine and - p-phenylporphyrin (NiTAPc and NiTAPP, respectively) h…
Interaction of water soluble Fe(III) tetrakis(4- N-methylpyridinium)porphyrin (Fe(III)TMPyP) with sodium dodecyl sulfate (SDS) in submicellar concentrations has been studied by surface tension, optical absorption, resonance light scattering (RLS), zeta-potential, and energy dispersive X-ray spectroscopy (EDS) measurem…
A new oxygen-deficient Ruddlesden−Popper (RP) cobaltite Sm 2 BaCo 2 O 7−δ (δ ≈ 1.0) has been synthesized and the crystal structure elucidated by Rietveld analysis of X-ray powder diffraction (XRD) data and transmission electron microscopy (TEM). The phase crystallizes in a primitive orthorhombic unit cell, with lattic…
Carbon nanohorns (CNHs) covalently functionalized at the conical tips with porphyrin (H 2 P) moieties were used to construct photoelectrochemical solar cells. Electrophoretic deposition was applied to fabricate films of the modified CNHs onto optically transparent electrodes (OTE) while nanostructured SnO 2 films were…
The formation of NiFe 2 O 4 nanoparticles dispersed in an aerogel silica matrix was investigated as a function of calcination temperature by X-ray absorption fine structure and X-ray absorption near edge structure at both the Fe and Ni K-edges. In particular, nanocomposite aerogels containing a relative NiFe 2 O 4 amo…
9,10-Dichlorooctafluoroanthracene (1) reacts with aryl boronic acids and terminal alkynes under palladium-catalyzed cross-coupling conditions to afford 9,10-diaryloctafluoroanthracenes (2a-e) and 9,10-dialkynyloctafluoroanthracenes (6a,b), respectively. Optical spectroscopy and cyclic voltammetry indicate that octaflu…
Transparent electrodes, formed by 50 nm bundles of rutile nanowires (NW), 2 nm in diameter, have been prepared directly by chemical bath deposition at low temperature on conducting glass. The photoelectrocatalytic behavior of such NW electrodes has been studied in acidic solutions in the presence of model organic mole…
The acid-catalyzed condensation of the bispyrrolylbenzene derivative and benzaldehyde yielded macrocycles 1 and 2 bearing three and four dipyrrin units which are connected by 2,3-dimethoxy-1,4-phenylene rings. The cationic guest recognition ability of 1 was investigated by UV-vis absorption, (1)H NMR spectroscopic tec…
The crystalline morphology in thin and ultrathin films of linear low-density polyethylene is reported here. Films with thickness ranging from 20 to 800 nm were isothermally crystallized at temperatures ranging from 90 to 119 °C, and the supermolecular and lamellar morphologies were observed by contact and tapping mode…
We have demonstrated through quantum chemical calculations that the reactivity of the carbon nanomaterials can be enhanced remarkably by introducing different types of curvature into the carbon nanosurface. This effect is observed to be more pronounced for a concave surface than for a convex one. The concept of curvat…
Understanding protein solubility is important for a rational design of the conditions of protein crystallization. We report measurements of lysozyme solubility in aqueous solutions as a function of NaCl, KCl, and NH4Cl concentrations at 25 degrees C and pH 4.5. Our solubility results are directly compared to preferent…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTElastic Modulus of Microfibrillar Cellulose GelsReghan J. HillView Author Information Department of Chemical Engineering and McGill Institute for Advanced Materials, McGill University, Montreal, Quebec H3A 2B2, CanadaCite this: Biomacromolecules 2008, 9, 10, 2963–2966Publicatio…
Photolithography can be used to form monodisperse colloids of well-defined, nonspherical shape in a negative photoresist, SU-8. In aqueous suspension, in the presence of dextran as a depletant, we showed previously that the aggregation of these particles was highly selective for the end-to-end configuration: cylinders…
The influence of excitation wavelength and embedding media on fluorescence blinking statistics of 4 nm x 20 nm cadmium selenide (CdSe) nanorods is investigated. Photon antibunching (PAB) experiments confirm nonclassical emission from single CdSe nanorods that exhibit a radiative lifetime of 26 +/- 13 ns. The blinking…
High quantum yield (47%) InP nanocrystals can be prepared without the need for post HF treatment by combining microwave methodologies with the presence of a fluorinated ionic liquid. Growing the InP nanocrystals in the presence of the ionic liquid 1-hexyl-3-methyl-imidazolium tetrafluoroborate (hmim BF4) allows in sit…