Materials Literature
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The rheology and microstructure of aqueous dispersions containing Mg–Al layered double hydroxides (LDHs) are considered. The thickening and gelling of such dispersions can be controlled by the addition of electrolyte or, within a certain composition range, by the application of shear. In addition to electrolyte and LD…
A new series of bis-macrocyclic bola-amphiphiles were prepared, and their transport activities in vesicle and planar bilayer membranes were evaluated. From vesicle experiments, the apparent kinetic order in transporter indicates that aggregates are the kinetically active species. Step-conductance changes observed in p…
Differential thermal analysis is used to examine the kinetics of nucleation associated with the melt phase crystallization of n -alkanes in the homologous series C 13 H 28 to C 32 H 66 . Crystallization studies from stagnant melt samples reveal a direct correlation between structural type and nucleation behavior, nota…
A thermotropic dialkoxy biphenyl liquid crystal, functionalized by a carboxylic acid group at one extremity, is mixed to varying proportions with poly(4-vinylpyridine) (P4VP). The liquid crystal, LC-4,6A, is characterized by a monotropic smectic A phase and a highly ordered or crystalline lamellar phase formed primari…
A novel soluble tetranuclear copper(I) cluster containing an unsubstituted μ 4 -selenido moiety, [Cu 4 (μ-dppm) 4 (μ 4 -Se)] 2+ ( 1 ), has been synthesized and characterized by X-ray crystallography. Its photophysical and electrochemical properties have been studied. It is envisaged that the emissions of 1 are associa…
Silole–pyrrole co-oligomers (containing up to nine rings) are synthesized and found to have long UV–VIS absorption maxima in spite of their twisted structures.
Heat capacity spectroscopy measurements in the frequency range from 1.25 to 12 600 rad/s at the dynamic glass transition in poly(vinyl acetate) are reported. The data are compared to results of dielectric and shear spectroscopy in a comparable frequency range on the same sample. The peaks of the different imaginary pa…
It is shown that is an excellent host lattice to obtain efficient VUV excited photoluminescent materials at room temperature. The introduction of ions in the lanthanum metaborate host lattice increases both the ionicity of the metal‐ligand bonding and the energy transfer rate between the host and the activator.
1,3,5-Tris(1-naphthyl)benzene ( 1 ), 1,3-bis(1-naphthyl)-5-(2-naphthyl)benzene ( 2 ), and 1-(1-naphthyl)-3,5-bis(2-naphthyl)benzene ( 3 ) easily supercool and form glasses on cooling from the melt. We synthesized 1, 2, and 3 using Suzuki's conditions to effect the cross-coupling reactions of 1,3,5-tribromobenzene with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of B, BH, BH2, and BmHn Species: Thermochemistry and KineticsS. H. BauerView Author Information Cornell University, Department of Chemistry, Baker Laboratory, Ithaca, New York 14853-1301 Cite this: Chem. Rev. 1996, 96, 6, 1907–1916Publication Date (Web):October 1,…
Abstract
A novel approach has been proposed to describe the relationship between the conductivity and relative density of highly porous materials. As a first approximation, porous material was represented by a uniaxial string of spheres along the direction of the potential gradient. Then, a string of spheres was remodeled into…
A realistic model of transport properties of zinc oxide varistors is constructed from two-dimensional Voronoi networks and studied via computer simulations. In agreement with experimental microcontact measurements made on individual junctions, the networks are assumed to contain randomly distributed microjunctions of…
This paper presents a novel class of nonlinear optical (NLO) polymer for second harmonic generation (SHG). This new class of NLO polymer consists of the linear polyurethane, T-polymer, of tolylene 2,4-diisocyanate (TDI) with 3-[(2-hydroxyethyl)amino]-5-(hydroxymethyl)-4‘-nitroazobenzene (T-AZODIOL), whose dipole momen…
Methyl cellulose has been used as a stabilizer in the oxidative dispersion polymerization of aniline using ammonium persulfate oxidant. The dispersion polymerization is unsuccessful in water but successfully effected in aqueous alcohol media. Evidence has been presented that the stabilizer incorporation in polyaniline…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTReversible Photochromism of a Crystalline Dithienylethene Copper(I) PolymerMegumu Munakata, Liang Ping Wu, Takayoshi Kuroda-Sowa, Masahiko Maekawa, Yusaku Suenaga, and Koji FuruichiView Author Information Department of Chemistry, Kinki University, Kowakae Higashi-Osaka…
Nineteen cutting-edge articles by leading practitioners review critical issues concerning biocompatible materials-polymers, metals, and other materials-used in or on the human body. Topics range from
The trinuclear complex (&mgr;(3)-CO(3))[Ni(3)(Medpt)(3)(NCS)(4)] was obtained by reaction of basic solutions of nickel(II), Medpt (bis(3aminopropyl)methylamine) and thiocyanate ligand with atmospheric CO(2) or by simple reaction with carbonate anion. (&mgr;(3)-CO(3))[Ni(3)(Medpt)(3)(NCS)(4)] crystallizes in the tricli…
Protein B23 is a major nonribosomal nucleolar protein and putative ribosome assembly factor that has been demonstrated to form oligomers. Sedimentation velocity and equilibrium analyses were used to examine the oligomerization properties of recombinant proteins B23.1 and B23.2. Under low ionic strength conditions prot…
Treatment of high-concentration wastewater from a chemical company by wet air oxidation (WAO) is studied. Experiments were conducted to investigate the effects of the operating pressure and temperature on the chemical oxygen demand (COD) removal. Both air and oxygen were employed as the oxygen supply for the WAO treat…