Materials Literature
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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…
In this study, we reported that fatty acid hydroperoxides and hydrogen peroxide are capable of epoxidizing 4-hydroxy-2-nonenal, a lipid peroxidation product, to the mutagenic epoxide. The evidence of its formation is provided (i) by trapping with [8-3H]deoxyadenosine for the formation of 7-(1',2'-dihydroxyheptyl)-1,N6…
Based on our previous works, we propose a new model for damage structure of graphite based on sp 2 to sp 3 transition of carbon atoms that can explain the change of the materials' parameters observed both in damaging and annealing processes. In early stage of the irradiation, defects are produced in a basal plane and/…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSolid State Photochemistry of Cu2(OH2)2(O2C(CH2)4CH3)4 in Thin Films: The Photochemical Formation of High-Quality Films of Copper and Copper(I) Oxide. Demonstration of a Novel Lithographic Technique for the Patterning of CopperAlfred A. Avey and Ross H. HillView Author…
Two bis[2-(3,4-ethylenedioxy)thienyl]carbazole-based polymers are synthesized by the electropolymerization of highly conjugated, low-oxidation potential monomers; these polymers exhibit multicolour electrochromic behaviour, each possessing three separate accessible states.
We report here the synthesis of the ligand 1-(( p -nitrophenyl)carboxymethyl)-4,7,10-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane ( 3 ) and its La(III), Gd(III), Ho(III), and Yb(III) complexes. The introduction of the p -nitrophenyl substituent on the methylenic carbon of one acetate group does not alter the ove…
A series of regioregular head-to-tail poly[3-(alkylthio)thiophenes] have been synthesized. The synthetic approach includes the in-situ preparation of 2-bromo-3-(alkylthio)-5-(bromozincio)thiophenes via regiospecific oxidative addition of Rieke zinc (Zn*) to 2,5-dibromo-3-(alkylthio)thiophenes, and the regiospecific po…
We report the crystal structure at 1 Å resolution of europium bound to diethylenetriaminepentaacetate covalently coupled to an organic chromophore, carbostyril 124 (DTPA-cs124; carbostyril 124 = 7-amino-4-methyl-2(1 H )-quinolinone). The complex is highly luminescent in solution and in the crystal form. The Eu-DTPA-cs…
The performance of a 12.2L batch crystallizer operated under natural cooling mode was remarkably improved with seeding. The product crystal size distribution (CSD) was bi-modal at low seed concentrations, reflecting the contribution of crystals newly generated by a secondary nucleation mechanism. With increasing seed…
Spectral properties and equilibrium constants of multimolecular complexes (triads) formed by 2-fold coordination of dipyridyl-substituted free bases of porphyrin, chlorin, or tetrahydroporphyrin with Zn−porphyrin and Zn−chlorin dimers bridged by either of two different spacers between the monomeric entities have been…
Two kinds of styrene microemulsion systems were polymerized to prepare polystyrene microspheres (micro-PS), one emulsified by sodium dodecyl sulfate (SDS) and coemulsified by 1-pentanol and the other emulsified by octylphenoxypoly(ethoxyethanol) (OP-10). Micro-PS possessed an essentially atactic configuration from 1 H…
New layered perovskite compounds of RbLaTa2O7 and RbCa2Ta3O10, whose Rb+ ions can be ion-exchanged have been synthesized directly by a solid-state reaction. Lithium ion-exchanged compounds, LiLaTa2O7 and LiCa2Ta3O10, have also been synthesized by ion-exchange reactions of the rubidium compounds with LiNO3 molten salt.…