Materials Literature
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Abstract The luminescence properties of tris(2,2′-bipyridine) ruthenium complex (Ru(bpy)32+) incorporated into polymer Langmuir–Blodgett (LB) films (polymer nanosheets) excited by localized surface plasmon on metal nanoparticles are described. It was clearly demonstrated that the luminescence intensity of Ru(bpy)32+ w…
MCM-48 was surface modified via vapor-phase reactions with hexamethyldisilazane (CH(3)-MCM-48) and 3-aminopropyldimethylethoxysilane (NH(2)-MCM-48). (29)Si NMR confirmed that the resulting materials contained covalently attached trimethylsilane and 3-aminopropyldimethylsilane moieties, both important functionalities f…
We discuss the minimum size of ice nanoparticles in water-rich glycerol-water mixtures, as studied by broadband dielectric spectroscopy (BDS) in the frequency range from 1 Hz to 250 MHz and differential scanning calorimetry (DSC) at the temperature interval from 138 to 313 K. It is known that the extra water which is…
The design, synthesis, and electropolymerization of sterically hindered pyrrole derivatives are described. Endo and exo adducts of cyclopentadiene and N -phenylmaleimide were converted to give bicyclo[2.2.1]heptane-fused pyrrole monomers, in which a phenyl group is rigidly placed proximate the pyrrole fragment. Oxidat…
Abstract Ultrathin, single-crystalline gold nanosheets with thickness of ca. 10 nm are successfully obtained in water by photoreduction of Au(OH)4− ions at the surface of ionic liquid (IL) μ-droplets. The nanosheets produced at the interface are spontaneously extracted into the ionic liquid phase, which effectively pr…
We study the capillary forces arising from charged colloidal particles trapped at an oil-water interface. Since it is quadratic in the electric field, the electric stress acting on the interface cannot be written as the superposition of one-particle terms. Indeed, we find that the interfacial pressure is dominated by…
Segmental dynamics are measured in pure polyisobutylene (PIB), pure deuterium-labeled head-to-head poly(propylene) (hhPP), and a blend containing 70% PIB/30% hhPP by mass using 13 C spin−lattice relaxation, 2 H spin−lattice relaxation, and dielectric spectroscopy (DS). The NMR measurements are made between 313 K and 4…
A new type of chiral receptor (R,R)- or (S,S)-1b with C(2) symmetry was synthesized. An induced-fit type of binding behavior of 1b for diamines was revealed by CD spectroscopy. NMR studies demonstrated that 1b can function as a highly sensitive chiral shift reagent for the determination of the enantiomeric purity of c…
DFT and post Hartree-Fock calculations were carried out to characterize the electronic structure of the 10-electron-reduced [PMo8V4O40(VO)4](5)(-) polyoxometalate. This molecule may be viewed as a mixed-metal PMo8V4O40 Keggin structure capped with four VO units, in which the eight vanadiums form a ring. In mixed V/Mo…
Three mononuclear manganese (II) complexes with quinoline-2-carboxylate ion (quin-2-c), [Mn(quin-2-c) 2 (H 2 O) 2 ] 2 ·Hquin-2-c·2H 2 O ( 1 ), Mn(quin-2-c) 2 (EtOH) 2 ( 2 ), and HbimH[Mn(quin-2-c) 2 Cl] ( 3 ) (HbimH + = benzimidazolium ion), have been obtained by self-assembly and structurally characterized by X-ray d…
Abstract The Ni(dmit)2 salt with an Fe(III) spin-crossover cation, Fe(qsal)2, was prepared and showed a cooperative spin transition based on π–π interactions between π-ligands. The light-induced excited spin state trapping effect on this complex was also observed.
This paper reports the findings of a detailed study of the self-assembly of gold nanoparticles at the surface of carbon nanotubes (CNTs). The study included the development of a predictive model for the interactions (charge transfer, van der Waals, osmotic, elastic, nonelastic, and covalent) between tetraoctylammonium…
Molecular population genetic investigation of Drosophila male reproductive genes has focused primarily on melanogaster subgroup accessory gland protein genes (Acp's). Consistent with observations from male reproductive genes of numerous taxa, Acp's evolve more rapidly than nonreproductive genes. However, within the Dr…
Composite materials consisting of polyaniline/poly(4-styrene-sulfonate) (PAn/PSS) or polyaniline/Au nanoparticles capped with 2-mercaptoethane sulfonic acid (PAn/Au-NPs) are prepared in the form of thin films (thickness ca. 90 nm) on Au electrodes or in the form of microrods linked to a Au surface. The composite mater…
We have investigated the formation of tungsten oxide nanowires under different chemical vapor deposition (CVD) conditions. We find that exposure of oxidized tungsten films to hydrogen and methane at 900 degrees C leads to the formation of a dense array of typically 10 nm diameter nanowires. Structural and chemical ana…
We report the synthesis and characterization of hemicylindrical shell nanowires (HSNWs) composed of nanocrystalline cadmium sulfide (CdS). CdS HSNWs were synthesized by first electrodepositing microcrystalline cadmium (Cd) nanowires by electrochemical step-edge decoration on graphite electrode surfaces and then conver…
Single-crystal beta-MnO(2) nanotubes with diameters in the range 200-500 nm and lengths up to several micrometers were successfully prepared by a simple hydrothermal method through oxidizing MnSO(4) with NaClO(3) in the presence of poly(vinyl pyrrolidone) (PVP). It was found that the formation process of beta-MnO(2) n…
Two new anil molecules exhibiting photochromism in the crystalline state, N -(4-hydroxy)-salicylidene-amino-4-(methylbenzoate) ( 2 ) and N -(3,5-di- tert -butylsalicylidene)-4-aminopyridine ( 3 ), are obtained. Upon irradiation in the UV, the yellow crystals change color to red, owing to enol-keto intramolecular tauto…
A rationally designed peptide and a thioalkylated poly(ethylene glycol) are used to stabilize Ag nanoparticles in water. Particle aggregation and oxidation are prevented to such a degree that nanoparticle solutions are stable in the presence of high concentrations of NaCl and over a wide pH range. This opens the door…
Abstract Implosion of vaporous cavities is exothermal, thereby heating the cavitating liquid. In vibratory cavitation erosion (VCE) tests the erosion rate increases with test liquid temperature. In order to obtain the erosive properties of a given material at a given temperature, it is necessary to control the test li…