Materials Literature
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Colloidal CdSe quantum dots were chemisorbed on a gold electrode using a variety of self-assembled monolayers (SAMs) consisting of dithiols and rigid disulfides. After absorption of a photon with an energy larger than the band gap, a long-lived excited state is formed in the quantum dot; this state can decay by electr…
ADVERTISEMENT RETURN TO ISSUEPREVNoteMesomorphic Form of Syndiotactic PolypropyleneVittoria, Liberata Guadagno, Angiolina Comotti, Roberto Simonutti, Finizia Auriemma, and Claudio De RosaView Author Information Dipartimento di Ingegneria Chimica e Alimentare, Università di Salerno, via Ponte Don Melillo, Fisciano (Sal…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanoparticle Assemblies: "Rectified" Quantized Charging in Aqueous MediaShaowei ChenView Author Information Department of Chemistry, Southern Illinois University Carbondale, Illinois 62901-4409 Cite this: J. Am. Chem. Soc. 2000, 122, 30, 7420–7421Publication Date (Web)…
Polyanion/polycation multilayers floating at the air/water interface were prepared by consecutive adsorption of polyelectrolyte layers onto a Langmuir monolayer from aqueous polyelectrolyte subphase solutions. With the positively charged Langmuir monolayer headgroups of the lipid dimethyldioctadecylammonium bromide, t…
We have explored new possible phases of 3D C60-based fullerites using semiempirical potentials and ab-initio density functional methods. We have found three closely related structures - two body centered orthorhombic and one body centered cubic - having 52, 56 and 60 tetracoordinated atoms per molecule. These 3D polym…
The energetics of transformation of a planar fragment of a graphite monolayer into a spherical cluster is studied. The path considered is that a flat cluster rolls up into a segment of a spherical shell. The energy landscape of the process is presented. A simple model, formerly invented for calculating the carbon nano…
Transition metal oxide nanoparticles have been synthesized sonochemically from metal acetates. The metal oxide nanoparticles are characterized using X-ray diffraction (XRD), diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM), and BET nitrogen adsorption. The results of DRS are analyzed in de…
peer reviewed
Biaxial composite materials can be synthesized through the homogenization of constituent mediums with material properties less complex than biaxial, provided the constituents collectively present two distinguished axes. We investigate homogenization in the context of dissipative anisotropic dielectric and dissipative…
We have studied energy transfer, fragmentation, and ionization in collisions between protons and ${\mathrm{C}}_{60}$ molecules. The collision energy is varied between 1 and 300 keV and we thus cover a velocity range from 0.2 to 3.5 atomic units. The distributions of intact and fragmented ${\mathrm{C}}_{60}$ ions have…
Fluorinated alcohols and fluorinated ethers adsorbed on carbon films have been studied in order to model the surface chemistry of Fomblin Zdol lubricants on the carbon-coated surfaces of magnetic data storage media. The model compounds used were 2,2,2-trifluoroethanol (CF 3 CH 2 OH), which is representative of the end…
Several in-situ chemical reduction methods were systematically evaluated in view of the formation of silver−latex composites, and in particular with respect to the task of coating colloidal latex spheres with uniform thin layers of silver. Such nanocomposite materials are of profound interest, due to their expected no…
We report here the results of $^1$H NMR spin-lattice relaxation time (T$_1$) studies in Glycine phosphite which is a ferroelectric below 224 K. The experiments have been carried out in the temperature range from 200 K to 419 K and at two Larmour frequencies of 11.40MHz and 23.56 MHz. We have noticed a Larmour frequenc…
We propose a physical model which explains the existence of finite thickness wetting layers in epitaxially strained films. The finite wetting layer is shown to be stable due to the variation of the non-linear elastic free energy with film thickness. We show that anisotropic surface tension gives rise to a metastable e…
Molecular dynamics simulations were performed for a polymer melt. In quiescent states, the inter-chain interaction energy supported by each particle takes relatively large values persistently for long times if the particle is close to an entanglement. Thus, if the interaction is averaged over appropriate time interval…
Uniaxial elongation and swelling of well-defined fully conjugated poly(3-octylthiophene) gels of various functionalities and cross-link concentrations are studied above the melting temperature. The gels exhibit rubber elasticity (elastic modulus E in the range 0.2 < E < 0.7 MPa) and swell in chloroform. A linear relat…
This report describes the synthesis and characterization of a series of octaethylporphyrin derivatives in which the porphyrin pi-network is connected to phenyl, 3-fluoranthenyl, or 1-pyrenyl aromatic systems through a meso amino or amido nitrogen. Metal-free bases and zinc(II) and iron(III) complexes have been obtaine…
For the first time, mixed-addenda vanadium-substituted polyfluorooxometalates, PFOMs, have been synthesized. Depending on the workup procedure used, two types of compounds were prepared. The first PFOM was a quasi Wells--Dawson type compound, [H2F6NaVVW17O56]8-, and the second a mixture of vanadium-substituted polyflu…
The conversion of 2-chloropropane (2-CP) in the presence of oxygen has been investigated over a number of catalysts including alumina and alumina-supported copper chloride, manganese tungstate, mixed manganese−aluminum oxide, silica−alumina, and ZSM5 zeolite. Dehydrochlorination to propene + HCl is predominant, but ot…
Sequence distribution and chemical structure of mass-selected macromolecules of poly(3-hydroxybutyrate- co -3-hydroxyvalerate), PHBV, biopolyester macroinitiator obtained by partial alkaline depolymerization of natural PHBV containing 5 mol % of HV units was determined by electrospray ionization multistage mass spectr…