Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of Passivating, Nylon-Like Coatings through Cross-Linking of Ultrathin Polyelectrolyte FilmsJeremy J. Harris, Paul M. DeRose, and Merlin L. BrueningView Author Information Department of Chemistry, Michigan State University East Lansing, Michigan 48824 Cite th…
This paper describes the stoichiometry, kinetics, and electronic resistivity of dilute graphite−sulfates intercalation compounds (stages pristine toVIII) obtained during electrochemical oxidation of graphite in 4M H 2 SO 4 solution. The stoichiometry of the reaction was determined by the use of cyclic voltammetry and…
Side-chain liquid-crystalline copolymers (SCLCPs) were synthesized from the alternating copolymerization of maleic anhydride with mesogenic 1-olefins. These SCLCPs showed high glass transition temperatures and highly ordered smectic mesophases. The mesophase width increased with spacer length. The terminal alkyl group…
The amino acid L-glutamate is a major neurotransmitter at excitatory synapses within the central nervous system. Neuronal responses to glutamate are mediated by at least three receptor types, one of which is the NMDA subtype, named for its specific ligand N-methyl-D-aspartic acid. Neurotransmitter receptors are transm…
The structures and energies of low-lying electronic states of AlN 3, Al 3 N, and Al 2 N 2 have been evaluated at the HF, MP2, QCISD(T), CCSD, and CCSD(T) levels of theory, using the several basis sets of 6-31G* (for HF), cc-pVDZ (for MP2 and QCISD(T)), and cc-pVTZ (for CCSD and CCSD(T)). The ground state of AlN 3 is p…
The spontaneous growth of thin films of carboxylic acid derivatized colloidal gold particles electrostatically immobilized at the hydrosol−organic solution interface onto moistened hydrophilic substrates is demonstrated. Immersion of the substrates up to the interface of the biphasic mixture leads to superlattice form…
The yields of tetraphenylporphyrin (TPP), N-confused tetraphenylporphyrin (NC-TPP), and tetraphenylsapphyrin (TPS) were examined under diverse conditions in the one-flask room-temperature reaction of pyrrole and benzaldehyde. The conditions examined included TFA and BF(3)-etherate catalysis, acid concentrations, pyrro…
The surface structure of alumina-supported gallium oxide catalysts for selective catalytic reduction of NO by CH 4 was studied. The XPS results showed that Ga atoms were dispersed well over the Al 2 O 3 surface for the samples with Ga 2 O 3 content below monolayer coverage (27 wt %) and that Ga 2 O 3 particles appeare…
X-ray photoelectron spectroscopy (XPS/ESCA) has been employed to investigate pure single crystals and powdered samples of yttrium aluminum garnet, Y 3 Al 5 O 12 (YAG), and YAG crystals doped with several rare earth elements (Ln = Pr, Er, Ho, Tm) and a transition metal (Cr). Core level XPS peak shapes of the main eleme…
Reactions of [M(MeCN) n ][BF 4 ] 2 salts with Bu 4 N(TCNQ) in MeOH yield M(TCNQ) 2 (MeOH) x (M = Mn, 1; Fe, 2; Co, 3; Ni, 4, x = 2−4), and reactions of MnCl 2, FeSO 4 ·7H 2 O, CoSO 4 ·7H 2 O and NiCl 2 ·6H 2 O in H 2 O produce M(TCNQ) 2 (H 2 O) 2 (M = Mn, 5; Fe, 6; Co, 7; Ni, 8 ). Infrared spectroscopy, powder X-ray d…
We study the static screening in a Hubbard-like model using quantum Monte Carlo. We find that the random phase approximation is surprisingly accurate almost up to the Mott transition. We argue that in alkali-doped Fullerenes the Coulomb pseudopotential $μ^\ast$ is not very much reduced by retardation effects. Therefor…
We discuss the problem of trapping and mobilization of nonwetting fluids during immiscible two phase displacement processes in porous media. Capillary desaturation curves give residual saturations as a function of capillary number. Interpreting capillary numbers as the ratio of viscous to capillary forces the breakpoi…
A novel approach to prepare magnetic polymeric nanoparticles by synthesis of the magnetite core and polymeric shell in a single inverse microemulsion is reported. Stable magnetic nanoparticles colloid dispersion with narrow size distribution can thus be produced. The microemulsion seed copolymerization of methacrylic…
Abstract Following an earlier paper (SPE 37274, 1997),1 we have continued to investigate the thermal stability of scale inhibitors for application in high pressure/high temperature (HP/HT) reservoirs. HP/HT reservoirs are currently under development in the North Sea and are characterised by high salinity brines (TDS &…
Abstract The continual need to reduce oil production costs has led Mobil North Sea Limited (MNSL) and TR Oil Services Limited (TROS) to develop a new strategy for maximising the efficiency of scale squeeze treatments on the Beryl Field. The strategy combines the advantages of enhanced precipitation scale inhibitors wi…
Abstract One of the most common methods of preventing downhole and topside mineral scale formation in oilfields is through the use of chemical scale inhibitors. Several aspects of the brine composition may affect the performance of the various scale inhibitors used in oilfield applications. In this paper, we focus on…
Hen egg-white lysozyme dissolved in glycerol containing 1% water was studied by using CD and amide proton exchange monitored by two-dimensional 1H NMR. The far- and near-UV CD spectra of the protein showed that the secondary and tertiary structures of lysozyme in glycerol were similar to those in water. Thermal meltin…
Permalloy (Py:Ni81Fe19) exhibits an anisotropic magnetoresistance (AMR) which is very often used to read magnetic signals from storage devices. Py-films of thickness 20nm were prepared by dc-magnetron sputtering in a magnetic field onto thermally oxidized Si-wafers and annealed ex situ at temperatures up to 1000K in o…
We use computer simulations to study the behavior of atomically sharp and blunted cracks in various f.c.c. metals. The simulations use effective medium potentials which contain many-body interactions. We find that when using potentials representing platinum and gold a sharp crack is stable with respect to the emission…
Photochemical release (uncaging) of bioactive messengers with three-dimensional spatial resolution in light-scattering media would be greatly facilitated if the photolysis could be powered by pairs of IR photons rather than the customary single UV photons. The quadratic dependence on light intensity would confine the…