Materials Literature
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Propagation of PAMAM (polyamidoamine) dendrons on solid spherical silica gel was achieved by a series of alternate Michael addition and amidation reactions. The reaction kinetics studies were investigated quantitatively. A newly developed method of immobilizing inert 3-(triethoxysilyl) propionitrile (TESPN) on silica…
Abstract The title donor–π–acceptor compounds were prepared by the reaction of acetylenes containing a 1,3-dithiol-2-ylidene unit with tetracyanoethylene (TCNE). They showed amphoteric properties and intramolecular charge-transfer absorptions in the visible region. The molecular and crystal structures were revealed by…
Linear, branched, and arborescent fluoropolymer-Si hybrids were prepared via surface-initiated atom transfer radical polymerization (ATRP) from the 4-vinylbenzyl chloride (VBC) inimer and ClSO(3)H-modified VBC that were immobilized on hydrogen-terminated Si(100), or Si-H, surfaces. The simple approach of UV-induced co…
The pretreatment conditions (temperature, medium) have a strong influence on the N 2 O decomposition activity of Fe−ZSM-5 catalysts (J. Jia et al., J. Catal . 2002, 210, 453). We used X-ray absorption spectroscopy to follow in situ the structural changes of the iron oxide clusters in an Fe−ZSM-5 sample, which was prep…
Polycrystalline europium monoxide (EuO) films doped with and without Gd were prepared using a reactive deposition method in a MBE system. Two different electron doping methods, Gd substitution and oxygen deficiency, enhance the Curie temperature ( T C ) and the temperature dependence of magnetization differently. Gd d…
The visible luminescence of Pr3+ and Tm3+ ions in lead borate glasses has been investigated as a function of activator concentration. The Judd–Ofelt analysis and the Inokuti–Hirayama model for energy transfer between activator ions have been applied for investigations of the radiative and non-radiative relaxation of t…
alpha-Helices are important structural elements in proteins. To provide a scaffold for the facial recognition of peptides, we have explored the interaction of cationic mixed monolayer protected clusters (MMPCs) with a tetra-aspartate peptide in water. In these studies, substantial enhancement of peptide helicity was o…
The activation of Cu + ions for NO binding by the zeolite “ligand” is analyzed. Density functional theory (DFT) calculations show that the interaction of NO with isolated Cu + ions and with Cu + ions in zeolites is of different character. In gas-phase Cu + −NO complexes interactions of the a‘ singly occupied orbital (…
A heparin-conjugated biodegradable polymer (PLA-heparin) by the direct coupling of heparin to polylactide (PLA) was synthesized and characterized. The surface exposed heparin content associated PLA-heparin was measured to be 0.067 microg/cm2. PLA-heparin coated surface has shown higher hydrophilicity rather than contr…
Uniform-sized MnO nanospheres and nanorods were fabricated by the thermal decomposition of Mn−surfactant complexes. The particle sizes of the nanospheres were varied from 5 to 40 nm by changing the surfactant. The shape of the particles could be controlled by varying the experimental conditions. The synthesized MnO na…
The use of block copolymer micelles as novel nucleating agents for foaming thermoplastics is explored. Diblock copolymers can self-assemble into a large number of spherical micelles, making them promising nucleants for the production of microcellular foams with >10 9 cells/cm 3 . Different types of A−B diblock copolym…
Stable carbon dioxide-in-water emulsions were formed with silica nanoparticles adsorbed at the interface. The emulsion stability and droplet size were characterized with optical microscopy, turbidimetry, and measurements of creaming rates. The increase in the emulsion stability as the silica particle hydrophilicity wa…
We have been able to synthesize Lu 3+ substituted La 0.67 Ca 0.33 MnO 3 (LCMO) by an auto-combustion method. Synthesis of this compound is not successful by conventional ceramic or other chemical methods. The magnetic and electrical transport properties of the Lu substituted LCMO [(La 1− x Lu x ) 0.67 Ca 0.33 MnO 3 (…
Evaporated gold island films have been the subject of studies dealing with a variety of spectroscopic and sensing applications. Development of these and other applications requires film stability as well as tunability of the morphology and optical properties of the island films. In the present work, ultrathin, island-…
Light harvesting in photosynthetic antenna proteins involves a series of highly efficient ultrafast energy transfers between spectroscopically different populations of chlorophylls. Several strategies have recently been employed to mimic this natural energy transfer process, including polymers, dendrimers, and oligome…
Polystyrene nanofibres were electrospun with the inclusion of cationic surfactants, dodecyltrimethylammonium bromide (DTAB) or tetrabutylammonium chloride (TBAC), in the polymer solution. A small amount of cationic surfactant effectively stopped the formation of beaded fibres during the electrospinning. The cationic s…
Structured Fluids Polymers, Colloids, Surfactants. by Thomas A. Witten with Philip A. Pincus. Oxford University Press, Oxford, 2004. 230 pp. $74.50, £39.95. ISBN 0-19-852688-1. The authors use a scaling approach to provide a unified, pedagogical introduction to fluids containing polyatomic structures such as polymer m…
The present neutron-scattering experimental findings concern with a study of fragility of trehalose, maltose, and sucrose/water mixtures. The fragility degree has been characterized by a new definition based on the correlation between viscosity and mean-square displacement as obtained by elastic incoherent neutron sca…
Abstract The tetramethoxysilane (TMOS)/2‐hydroxylethyl methacrylate (HEMA) hybrid gels were synthesized with acid and base catalysts, via the in situ polymerization of HEMA, with and without the cosolvent methanol. With methanol in the TMOS/HEMA sol, the enhanced esterification and depolymerization reactions of the si…
The purpose is to show that TDDB reliability of damascene structures has to be assessed as a system composed of a dielectric, copper diffusion barrier and copper. This becomes mandatory when porous low-k materials are considered, since barrier integrity is a key contributor in TDDB behavior. Solely addressing the diel…