Materials Literature
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Abstract Growth of bulk nonlinear optical (NLO) single crystals gained new significance with the advent of solid‐state laser sources for opto‐electronic applications. An optically transparent crystal of potassium dihydrogen phosphate (KDP) has been grown from aqueous solution along (001) plane with the aid of modified…
The phosphonated ruthenium complex, [Ru(tpy-PO(3)H(2))(OH(2))(3)](2+) (1) (tpy-PO(3)H(2) = 4'-phosphonato-2,2':6',2' '-terpyridine), was synthesized and attached to glass|ITO or glass|ITO|TiO(2) electrodes. After attachment to the metal oxide surface through the phosphonate linkage, 1 can be oxidized (either chemicall…
Abstract Organic‐inorganic hybrid gels have been synthesized by means of co‐gelation of multi‐functional cyclic siloxane, 1,3,5,7‐tetramethylcyclotetrasiloxane (TMCTS), or cubic silsesquioxane, 1,3,5,7,9,11,13,15‐octakis(dimethylsilyloxy)pentacyclo‐[9,5,1,1,1,1]octasilsesquioxane (POSS), as crosslinking reagents with…
This work examines the precipitation of PCC – pulp composite fillers with varying crystal habits and their effects on the papermaking properties of printing and writing paper. Colloidal (c-PCC), rhombohedral (r-PCC), and scalenohedral types (s-PCC) of composite PCCs were produced and compared with commercial reference…
Complexation of Keggin-type polyoxometalates (POMs), [α-PW 12 O 40 ] 3- (PW), [α-SiW 12 O 40 ] 4- (SiW), and [γ-SiV 2 W 10 O 38 (OH) 2 ] 4- (SiVWH) with cationic transition-metal complexes having a triazacyclononane ligand, [M(tacn) 2 ] n + (M−tacn; M = Co III and Ni II; tacn = 1,4,7-triazacyclononane), yields fine pa…
We present a technique for in situ Raman measurements of suspended individual single-walled carbon nanotubes (SWNTs) under strain. We observe a strong change in the radial breathing mode intensity with increasing strain as the nanotube moves out of (or into) resonance, and for strain greater than approximately 2%, the…
Abstract The rising interest in low temperature heat energy conversion encourages the application of thermoelectric devices. However, conventional thermoelectric devices used in the Seebeck mode as thermoelectric generators have several shortcomings and thus are inefficient when used as a generator. Additionally, the…
Ein Molekülpaar aus Emitter und Sensibilisator (siehe Bild; rot/grün C, weiß H, blau N, hellblau O, grau Pd) wurde speziell für den Prozess der nichtkohärenten Aufkonversion hergestellt. Zwischen der Energie der zur Anregung genutzten Photonen und der des emittierten Lichtes tritt eine hypsochrome Verschiebung von ca.…
The functionalization of nanoparticles is conditio sine qua non in studies of specific interaction with a biological target. Often, their biological functionality is achieved by covalent binding of bioactive molecules on a preexisting single surface coating. The yield and quality of the resulting coated and functional…
Eight hetero- and homometal complexes 1-6, containing the metal centers Ni(II)Fe(III)Ni(II) (1), Mn(III)Ni(II) (2), Ni(II)Ni(II) (3a-c and 4), Zn(II)Ni(II) (5), and Zn(II)Zn(II) (6), are described. The tridentate ligation property of the metal complexes tris(pyridine-2-aldoximato)nickel(II) and tris(1-methylimidazole-…
Photochemical synthesis of gold nanorods (NRs) in a micellar solution of hexadecyltrimethylammonium bromide (CTAB) was triggered by photoreactions of ketones. Photoexcitation of gold ions and silver bromide clusters ((AgBr)n) in the absence of ketones did not produce NRs. The initial products of the photoirradiation w…
Nanobouquets: Shuttle-like fusiform bundles of L-cysteine–Pb nanowires split and open out to form dandelion-like flowers with well-aligned architectures (see image). The synthetic procedure provides an efficient route to the controllable preparation of well-arranged nanowires and, in a further step, to the formation o…
Variations on thermal stabilities were studied when the ligands of coordination compounds of manganese (II) acetylacetonate (Mn(acac) 2 ) and iron (III) acetylacetonate (Fe(acac) 3 ) were substituted with benzoylacetonate (bzac). By replacing the acetylacetonate ligand with the benzoylacetonate ligand, the difference…
Nature has evolved proteins and enzymes to carry out a wide range of sophisticated tasks. Proteins modified with functional polymers possess many desirable physical and chemical properties and have applications in nanobiotechnology. Here we describe multivalent Newkome-type polyamine dendrons that function as syntheti…
In this study, we demonstrate the unique application of X-ray absorption spectroscopy (XAS) as a fundamental characterization tool to help in designing and controlling the architecture of Pd-Au bimetallic nanoparticles within a water-in-oil microemulsion system of water/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/n-h…
Poly(3-hydroxybutyrate) (PHB) granules isolated in native form (nPHB granules) from Ralstonia eutropha catalyzed formation of PHB from (14)C-labeled acetyl coenzyme A (CoA) in the presence of NADPH and concomitantly released CoA, revealing that PHB biosynthetic proteins (acetoacetyl-CoA thiolase, acetoacetyl-CoA reduc…
We demonstrate that confinement of a concentrated triconstituent precursor solution (a soluble phenol-formaldehyde prepolymer, tetraethylorthosilicate, and the nonionic triblock copolymer F127) in a poly(methyl methacrylate) (PMMA) colloidal crystal template permits control over the external morphology of mesostructur…
GaAs:Mn nanowires were obtained on GaAs(001) and GaAs(111)B substrates by molecular beam epitaxial growth of (Ga,Mn)As at conditions leading to MnAs phase separation. Their density is proportional to the density of catalyzing MnAs nanoislands, which can be controlled by the Mn flux and/or the substrate temperature. Af…
A new type of excitations by highly focused electron beams in scanning transmission electron microscopes is predicted for nanoparticles. The calculated electron energy loss spectra of metallic (silver) and insulating (SiO(sub2)) nanoplatelets reveal dramatic enhancement of radiative electromagnetic modes within the li…
We propose a mean-field analytical model to account for the observed asymmetry in the ability to form long-range attraction by the negatively charged colloidal particles and not their equivalently charged positive counterpart. We conjecture that this asymmetry is due to solvation effects, and we phenomenologically cap…