A polymer with the mesomorphic order of liquid crystalline phthalocyanines
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In situ infrared study of the surface oxidation of activated carbon in oxygen and carbon dioxide
The surface oxidation of a wood-based activated carbon by heat treatment in oxygen and carbon dioxide has been studied by diffuse reflectance Fourier transform infrared spectroscopy and compared with the results of aqueous oxidation by hydrogen peroxide and nitric acid. Untreated carbon gave infrared bands due to CO,…
Ferromagnetic Hetero–Metal Assemblies, {NBu4[CuCr(ox)3]}x and {[{Cu(bpy)}2Cr(ox)3]NO3}x
Abstract Two types of hetero–metal assemblies {NBu4CuCr(ox)3]}x (1) and {[{Cu(bpy)}2Cr(ox)3]NO3}x (2)(NBu4 = tetrabutylammonium ion, ox = oxalate ion, bpy = 2,2′-bipyridine, x = infinite number) have been synthesized and their cryomagnetic properties (4.2–300 K) have been examined. The compound 1 has an oxalate-bridge…
Revisiting MgO–CO surface chemistry: an IR investigation
The first product formed upon interaction of CO with the surface of fully dehydroxylated MgO is CO2–2. This species is generated by nucleophilic attack of a surface O2– on CO weakly σ-bonded on an Mg2+ cation in an adjacent position. The CO2–2 species generates C3O2–4 by addition of 2 CO molecules. Trimeric species (a…
Effects of Calcium Ion Concentration on Cel Wall Synthesis
Cuttings of 6-week-old Norway spruce (Picea abies (L.) Karst.) seedlings were placed in liquid media containing various concentrations of Ca2+. Cytoplasmic concentrations of Ca2+ were manipulated using the ionophore A 23 187. The effects of Ca2+ concentrations on the deposition of total cell wall material as well as o…
Disilene complexes of molybdenum and tungsten
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisilene complexes of molybdenum and tungstenDonald H. Berry, Jean H. Chey, Howard S. Zipin, and Patrick J. CarrollCite this: J. Am. Chem. Soc. 1990, 112, 1, 452–453Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 Janu…
Dicumyl peroxide‐modified cellulose/LLDPE composites
Abstract The present study reports results on the processing and mechanical properties of composites modified by the addition of dicumyl peroxide (DCP). The addition of minute amounts of peroxide to the cellulose/polymer system during processing has been shown to significantly improve the physical properties of compos…
Purification, characterization, and gene cloning of thermopsin, a thermostable acid protease from Sulfolobus acidocaldarius.
A thermostable, acid proteolytic activity has been found to be associated with the cells and in the culture medium of Sulfolobus acidocaldarius, an archaebacterium. This acid protease, which has been named thermopsin, was purified to homogeneity from the culture medium by a five-step procedure including column chromat…
Mössbauer and electron paramagnetic resonance study of the double-exchange and Heisenberg-exchange interactions in a novel binuclear Fe(II/III) delocalized-valence compound
In this paper we present the characterization by UV-VIS, Mössbauer, and EPR spectroscopy of [L2Fe2(μ-OH)3](ClO4)2⋅2CH3OH⋅2H2O, with L=N,N′,N″-trimethyl-1,4,7-triazacyclononane, a novel dimeric iron compound, which is shown to possess a central exchange-coupled delocalized-valence Fe(II/III) pair. Complete delocalizati…
Dynamics of copolymer and homopolymer mixtures in bulk and in solution via the random phase approximation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of copolymer and homopolymer mixtures in bulk and in solution via the random phase approximationA. Ziya Akcasu and M. TombakogluCite this: Macromolecules 1990, 23, 2, 607–612Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Publis…
Utility of the semiempirical INDO/1 method for the calculation of the geometries of second-row transition-metal species
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUtility of the semiempirical INDO/1 method for the calculation of the geometries of second-row transition-metal speciesWayne P. Anderson, Thomas R. Cundari, Russell S. Drago, and Michael C. ZernerCite this: Inorg. Chem. 1990, 29, 1, 1–3Publication Date (Print):January 1, 199…
Reduced Activation Materials for Fusion Reactors
Description Material for future reactors is the focus of this new publication from ASTM. Eighteen papers anticipate safety and waste disposal problems from induced radioactivity in the reactor materials. Papers presented in three sections: • Austenitic Stainless Steels • Ferritic Steels • Vanadium Alloys
Advanced ceramic processing and technology
Advanced Processing Concepts for Increased Ceramic Reliability Processing of Silicon Nitride Powders Wet Forming Processes as a Potential Solution to Agglomeration Problems Processing of Electronic Ceramics Processing of Ceramic Composites Injection Moulding of Fine Ceramics Electrophoretic Deposition as a Processing…
Ceramic‐Metal Composite Produced by Melt Infiltration
A new ceramic‐metal composite with continuous interconnected ceramic and metal phases has been fabricated from sintered aluminum nitride infiltrated with aluminum metal. A dense, lightweight, hard material with high strength has been obtained. Advance of the infiltration front was linear with time. The activation ener…
Statistical thermodynamics of block copolymer adsorption. Part 2.—Effect of chain composition on the adsorbed amount and layer thickness
Recently, we presented a self-consistent field theory for the adsorption of block copolymers [O. A. Evers, PhD Thesis, (Wageningen, 1990)]. The physical background of this theory is briefly reviewed and a number of results on the adsorbed amount and the hydrodynamic layer thickness of adsorbed di- and tri-block copoly…
PHOTOREACTIONS OF MACROCYCLIC DYES BOUND TO HUMAN SERUM ALBUMIN
The photophysical properties of tetrakis(4-sulfonatophenyl)porphyrin (H2TSPP), its tin (IV) complex (SnTSPP), aluminium(III) trisulfonatophthalocyanine (AIPCS), and the corresponding zinc(II) complex (ZnPCS), have been measured in H2O, D2O, and upon binding to human serum albumin (HSA). The triplet excited states of t…
Crystallographic characterization of the polyoxotungstate [Eu3(H2O)3(SbW9O33)(W5O18)3]18? and energy transfer in its crystalline lattices
The potassium salt of the new mixed-polyoxotungstate anion [Eu3(H2O)3(SbW9O33)(W5O18)3]18–(1) has been prepared from WO3, Sb2O3, Eu(NO3)3·6H2O, and KOH in water and isolated in crystalline form as K15H3[Eu3(H2O)3(SbW9O33)(W5O18)3]·25.5 H2O. It crystallizes in the monoclinic space group C2/m, with a= 30.250(7), b= 18.5…
Functionalization of polyethylenes and their use in reactive blending
Abstract The grafting of maleic anhydride (MAn) to low density polyethylenes (PEs) dissolved in 1,2‐dichlorobenzene (DCB) has been studied. Grafting was successful at temperatures of about 160°C both in air without initiator and under nitrogen with the radical initiator 2,5‐di( t ‐butylperoxy)‐2,5‐dimethyl‐3‐hexyne (L…
X-ray absorption spectra of poly-p-phenylenes and polyacenes: localization of π orbitals
Carbon K -edge X-ray absorption near edge structure (XANES) spectra of evaporated films of poly- p -phenylenes and polyacenes were measured by use of synchrotron radiation. Only one dominant resonance associated with a Cl s -to-π* transition was observed for each poly- p -phenylene, although there should exist several…
Evidence for tribochemical wear on amorphous carbon thin films
The friction and wear properties between a smooth oxide-based ceramic sliding and an amorphous carbon surface are greatly influenced by the surface chemistry of the carbon layer. Like most carbon compounds, surface oxides can form if the surface is exposed to oxygen. These surface species can desorb as carbon monoxide…