Materials Literature
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2.2.2-Cryptand(1+) salts of the [Sb(2)Se(4)](2)(-), [As(2)S(4)](2)(-), [As(10)S(3)](2)(-), and [As(4)Se(6)](2)(-) anions have been synthesized from the reduction of binary chalcogenide compounds by K in NH(3)(l) in the presence of the alkali-metal-encapsulating ligand 2.2.2-cryptand (4,7,13,16,21,24-hexaoxa-1,10-diaza…
The effect of Zn water chemistry additions on the mechanism of intergranular stress corrosion cracking (IGSCC) of Fe-based alloys in water at 288°C was evaluated in terms of the slip-dissolution model. In this model, an increase in the oxide film rupture strain or surface film repassivation kinetics improved resistanc…
J. M. Thomas, Faraday Discuss., 1996, 105, 1 DOI: 10.1039/FD9960500001
We have examined the effect of the substrate in cubic boron nitride (c-BN) film synthesis by depositing BN films on a variety of materials using ion-assisted pulsed laser deposition. Using optical modeling, we estimated the c-BN content of the films from the measured infrared reflectance spectra. We find less c-BN in…
The electrodeposition and properties of poly(1,8-diaminonaphthalene) films on Au electrodes have been studied using electrochemical quartz crystal microbalance and crystal impedance measurements. Redox switching of films exposed to aqueous 0.1 mol dm–3 HClO4 is accompanied by non-monotonic mass changes: proton, counte…
The combustion of methane with an excess of oxygen was examined under transient conditions in a catalytic monolith reactor. The reaction exhibited a sharp light off in the inlet region of the reactor, and essentially complete combustion was attained. The experimental reactor was modeled using a comprehensive two-dimen…
An artificial contamination method for hydrophobic polymer insulators has been developed which can provide a uniform contaminant layer, similar to that found in nature, without either damaging the polymer surface or by adding any chemical agent to the conventional contamination slurry. Using this method, the basic con…
The self-consistent-field model for polymer adsorption of Scheutjens and Fleer is extended to the case of semiflexible chains in a cubic lattice. It is found that the scaling behavior for adsorption from a dilute solution of polymers with the same radius of gyration, but with a varying degree of stiffness, is markedly…
We examine prospects for metastability of six-coordinate high-pressure semiconductor phases at ambient temperature and pressure (STP). We investigate a simple “thermodynamic”, coherent transformation model for nanocrystals of size >2 nm and, as a quantitative example, apply it to the silicon β-tin to diamond structura…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThermodynamically Controlled Morphological Disorder in a Microphase-Separated Cylindrical Block CopolymerKarsten Jung, Volker Abetz, and Reimund StadlerView Author Information Institut für Organische Chemie, Johannes Gutenberg Unive…
The fracture toughness G c of epoxy/high-impact polystyrene (HIPS) interfaces was measured as a function of grafting chain density Σ of carboxylic acid terminated deuterated polystyrene (dPS-COOH) chains of various degrees of polymerization N . The dPS chains penetrate into the bulk HIPS whereas the −COOH end function…
By using site-directed chemical labeling of lactose permease, conformational changes induced by ligand binding are observed in the native membrane of Escherichia coli. Membranes containing permease mutants with a single-Cys residue and a biotin-acceptor domain were labeled with radioactive N-ethylmaleimide (NEM) in th…
Polypyrrole-based colloids with differing surface chemistries were compared with respect to the specific activity of immobilized antibody. Monoclonal antibody to the alpha subunit of human chorionic gonadotropin (hCG) was modified by incorporation of cystamine into the Fc-carbohydrate, followed by reduction with dithi…
The reaction of 1:1 stoichiometries (1:1.5 for the nitrate/tetraethylene glycol (EO4) and pentaethylene glycol (EO5) complexes) of PbX(2) (X = NO(3), Br) with five- to eight-donor poly(ethylene glycols) (PEGs) in 3:1 CH(3)CN/CH(3)OH (CH(3)CN only for the nitrate/EO5 complex) followed by solvent evaporation resulted in…
The adsorption and decomposition of formic acid on (2×2)-NiO(111) surface have been studied using temperature-programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS) under ultrahigh vacuum (UHV) condition. Formic acid dissociated to surface formate at 163 K for low exposure and molecular ads…
The monolayer phase diagrams for a number of nonpolar, linear molecules adsorbed on the basal plane of graphite are reviewed. Values for some of the transition temperatures such as the 2D gas−liquid critical points and the melting points of the low-density 2D solids are collected. Upon comparison of these data with ea…
A series of 1,4,7-triazacyclononane-based ligands containing one, two, or three methylphosphinate (MP) side chains has been prepared. The macrocycle with three methylphosphinates, NOTMP, appeared to be a very promising ligand for monitoring Mg II in biological samples by 31 P NMR spectroscopy. The 31 P resonances of t…
A noncovalent adduct of the antineoplastic drug cis-diamminedichloroplatinum (cDDP) and a biocompatible graft copolymer of poly(L-lysine) and methylpoly(ethylene glycol) succinate is described. Upon incubation of cDDP with [O-methylpoly(ethylene glycol)-O'-succinyl]-N- epsilon-poly(L-lysine)n-N-epsilon-succinate, n =…
The preparation of novel fluorinated poly(β-hydroxyalkanoates), PHAs, was carried out using Pseudomonas oleovorans (ATCC 29347) and Pseudomonas putida (KT 2442) as biocatalysts. These organisms were first grown on 40 mM sodium citrate prior to studying polymer formation in the second stage using 1:1 molar mixtures of…
Surface-enhanced Raman scattering (SERS) spectra have been successfully recorded from individual, selected clusters of colloidal silver particles on which phthalazine, dopamine, or 2,2‘-bipyridine was adsorbed. The method involved the controlled deposition of silver colloid aggregates onto a Pyrex microscope cover sli…