Materials Literature
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Octahedral complexes of the type [M(tren)(LIBQ)]n+ or [M(tren)(LISQ)]n+ (tren = tris(2-aminoethyl)amine; LIBQ = o-iminobenzoquinone, (LISQ)1− = o-iminobenzosemiquinonate(1−) π radical, M = Ni, Co, Fe) have been prepared by the reaction of equimolar amounts of 2-anilino-4,6-di-tert-butylphenol, tris(2-aminoethyl)amine,…
Abstract A new model for the description of incoherent peaks observed in energy‐dispersive x‐ray fluorescence spectra is proposed. The model was derived after a systematic study of peak shapes based on Monte Carlo simulations. The model consists of a Gaussian modified by two exponential tail functions. The model is im…
We report velocity dependencies of dynamic contact angles for CCl 4 and tert -butyl alcohol on the amorphous fluoropolymer AF 1600 and compare them with our previous results for octamethylcyclotetrasiloxane (OMCTS) on the same substrate. The molecules of these liquids have well-defined form and the solid surface is al…
The phonon dispersion of single-walled boron nitride nanotubes is calculated within a valence shell model of the lattice dynamics. The model parameters are derived from fittings to the measured phonon dispersion of hexagonal boron nitride and available optical data. The calculated phonon dispersion curves for the tube…
Cyclic vinylogous tetrathiafulvalenes (TTFs) where the two dithiole rings are linked through the outer sulfur atoms with an alkyl chain of various lengths were synthesized by oxidative intramolecular coupling of bis(dithiafulvenes). Upon oxidation, these systems exhibit large molecular movements associated with electr…
We have produced, by thermal decomposition of an organometallic complex in a bulk film of P(S- b -2VP), nonagglomerated cobalt nanoparticles that exhibit significant room-temperature magnetic coercivity. The particles are patterned on the nanoscale: they reside within the P2VP domains of the block copolymer morphology…
A single strand of spider silk with a diameter of ∼5 µm and ∼3 cm in length was used as a template to dip-coat a liquid crystalline silica–surfactant mesophase along the direction of the silk strand to obtain a hierarchically ordered hollow mesoporous silica fiber (external diameter of 1–2 µm) after removal of the spi…
Abstract To investigate the position and amount of the CF 3 group affecting the coloration of polyimides (PIs), we prepared 2,2‐bis[4‐(4‐amino‐2‐trifluoromethylphenoxy)phenyl]hexafluoropropane ( 2 ) with four CF 3 groups with 2‐chloro‐5‐nitrobenzotrifluoride and 2,2‐bis(4‐hydroxyphenol)hexafluoropropane. A series of s…
Enantiodifferentiating polar photoaddition of alcohol to 1,1-diphenylpropene and 1,1-diphenyl-1-butene sensitized by saccharide naphthalene(di)carboxylates was performed in nonpolar to polar solvents containing methanol, ethanol, or 2-propanol as the nucleophile to give the corresponding anti-Markovnikov alcohol adduc…
We study the deformation of nonadhesive polyelectrolyte microcapsules under applied load using an atomic force microscope (AFM)-related force measuring device. Both “hollow” (water inside) and “filled” (water-polyanion solution inside) microcapsules are explored. The “filled” capsules were found to be much stiffer tha…
Cobalt (II) phthalocyanine (CoPc) molecules have been encapsulated within the supercage of zeolite-Y. The square-planar complex, being larger than the almost spherical cage, is forced to adopt a distorted geometry on encapsulation. A comparative spectroscopic and magnetic investigation of CoPc encapsulated in zeolite-…
Abstract Aldol reaction of 4-nitrobenzaldehyde with acetone gives 4-(4-nitrophenyl)-4-hydroxy-2-butanone in high yield in the presence of both secondary amine and mesoporous silica, whereas the yield is low in the absence of the mesoporous silica.
Abstract Postconsumer PET bottles including water and soft‐drink bottles were depolymerized by glycolysis in excess glycols, such as ethylene glycol, propylene glycol, and diethylene glycol, in the presence of a zinc acetate catalyst. The obtained glycolyzed products were reacted with maleic anhydride and mixed with a…
This article presents an overview of the “Nanolith” parallel electron-beam (e-beam) lithography approach. The e-beam writing head consists of an array of microguns independently driven by an active matrix complementary metal–oxide–semiconductor circuit. At the heart of each microgun is a field-emission microcathode co…
Nitrogen removal from wastewater is often limited by the availability of reducing power to perform denitrification, especially when treating wastewaters with a low carbon:nitrogen ratio. In the increasingly popular sequencing batch reactor (SBR), bacteria have the opportunity to preserve reducing power from incoming c…
A novel perfluorinated corrole, 2,3,7,8,12,13,17,18-octafluoro-5,10,15-tris(pentafluorophenyl)corrole, and its manganese(III) and oxomanganese(V) derivatives have been synthesized. The perfluorinated manganese corrolate exhibited excellent reactivity and stability in the catalytic oxidation of alkenes with iodosylbenz…
We measured specific heat and resistivity of heavy fermion CeCoIn5 between the superconducting critical field $H_{c2} = 5 T$ and 9 T, with field in the [001] direction, and at temperatures down to 50mK. At 5T the data show Non Fermi Liquid behavior down to the lowest temperatures. At field above 8T the data exhibit cr…
Processing methods are described for the development of magnesium diboride wire using the chemical vapor deposition (CVD) to produce long lengths of suitably doped starting boron fiber. It is found that titanium can be co-deposited with the boron to make long lengths of doped fiber that contain both TiB and TiB2. When…
Theoretical considerations based on chain connectivity and conformational variability of polymers have lead to an uncomplicated relation for the dependence of the Flory-Huggins interaction parameter, chi, on the volume fraction of the polymer, phi, and on its number of segments, N. The validity of this expression is b…
A series of doping experiments are reported for MgB2 conductors that have been synthesized using doped boron fibers prepared by chemical vapor deposition(CVD) methods. Undoped MgB2 samples prepared from CVD prepared fibers consistently give critical current densities, Jc, in the range of 500,000 A/cm^2 in low field at…