Materials Literature
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The reduction of NO by black liquor char and activated carbon was studied at atmospheric pressure in a fixed bed reactor at temperatures between 450 and 650 °C. Black liquor char has a high Na to fixed C ratio (2.7), and the Na is well dispersed within the carbon matrix. The reduction of NO by both materials was confi…
The 3,6-dideoxyhexoses can be found in the cell wall lipopolysaccharide of Gram-negative bacteria, where they have been shown to be the dominant antigenic determinants. All naturally occurring 3,6-dideoxyhexoses, with colitose as the only exception, are biosynthesized via a complex pathway that begins with CDP-d-gluco…
2,2‘-Bis(trifluoromethyl)-4,4‘,5,5‘-biphenyltetracarboxylic dianhydride (6FBPDA) was synthesized from 1-iodo-4,5-dimethyl-2-nitrobenzene via a six-step synthetic route. The dianhydride was polymerized with eight different substituted 4,4‘-diaminobiphenyls in refluxing m -cresol containing isoquinoline to afford a seri…
The reaction of aqueous solutions of Na 4 Ge 4 S 10 with various surfactant alkyltrimethylammonium bromide salts yielded new surfactant−inorganic phases containing the adamantane thiogermanate anion [Ge 4 S 10 ] 4 - . The resulting [C n H 2 n +1 N(CH 3 ) 3 ] 4 Ge 4 S 10 phases with n = 12, 14, 16, and 18 crystallize i…
Chiral oxovanadium(IV), copper(II), and palladium(II) β-diketonates show a room-temperature columnar mesophase which undergoes ferroelectric switching. All the compounds were obtained as liquid crystals at room temperature, and crystallization or melting processes were not detected by differential scanning calorimetry…
To overcome the explosions that can occur during the partial oxidation of methane, the latter exothermic reaction is coupled with an endothermic one, namely, the CO 2 reforming of CH 4 . These combined reactions have been carried out over NiO/MgO solid solution, NiO/Al 2 O 3, and NiO/SiO 2 catalysts. About 90% convers…
A quaternary combinatorial masking strategy was used in conjunction with photolithography to generate compositionally diverse thin-film phosphor libraries containing 1024 different compositions on substrates 2.5 centimeters square. A parallel imaging system and scanning spectrophotometer were used to identify and char…
The correlation between interfacial width and adhesion, as expressed by the fracture toughness of the interface, in glassy polymers is investigated. The interfacial width is measured accurately by neutron reflectivity, and the fracture toughness of the interfaces is determined from a double cantilever beam test. Two e…
We use a one-dimensional step model to study quantitatively the growth of step bunches on Si(111) surfaces induced by a direct heating current. Parameters in the model are fixed from experimental measurements near 900 deg C under the assumption that there is local mass transport through surface diffusion and that step…
The voltage induced driving force on a migrating atom in a metallic system is discussed in the perspective of the Hellmann-Feynman force concept, local screening concepts and the linear-response approach. Since the force operator is well defined in quantum mechanics it appears to be only confusing to refer to the Hell…
We discovered a first-order phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic phases in impurity-doped spin-Peierls (SP) cuprate Cu{1-x}MgxGeO3. As impurity concentration increases, linear reduction of SP transition temperature (T{SP}) and linear increase of Neel temperature (TN) are o…
The alkali metal salts (Li +, Na +, K + ) of 3,5-di- tert -butylsemiquinone anion (3,5-DBSQ) have been prepared in the presence of three amine bases, triethylamine (TEA), tetramethylethylenediamine (TMEDA), and pentamethyldiethyltriamine (PMDTA), as well as in the absence of amine in two solvents, toluene and THF. EPR…
We present a theory for thermodynamic and equation-of-state properties of polymer solutions over the entire concentration range, and for homopolymer melts, based on analytic polymer reference interaction site model (PRISM) methods. A single polymer is modeled as either an effectively Gaussian thread, or as a Gaussian…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHigh-Spin Molecules: Hexanuclear [Mn6O4Cl4(Me2dbm)6] (Me2dbmH = 4,4'-Dimethyldibenzoylmethane) with a Near Tetrahedral [Mn6O4Cl4]6+ Core and a S = 12 Ground StateGuillem Aromí, Juan-Pablo Claude, Michael J. Knapp, John C. Huffman, David N. Hendrickson, and George Chris…
Two new iron(III) complexes of the formulas [Fe(bpm)Cl 3 (H 2 O)]·H 2 O ( 1 ) and [Fe 2 (bpm)Cl 6 (H 2 O) 2 ]·2H 2 O ( 2 ) (bpm = 2,2‘-bipyrimidine) have been synthesized and their crystal structures determined by single-crystal X-ray diffraction. 1 and 2 crystallize in the monoclinic system, space group P 2 1 / n, wi…
Lipophilic lanthanide complexes of fluorinated β-diketonate ligands were demonstrated to bind unprotected phenylalanine, leucine, and other amino acids under neutral conditions. Extraction experiments supported that these lanthanide tris(β-diketonates) formed highly coordinated 1:1 complexes with amino acids, although…
The new macrocycle tetrakis(thiadiazole)porphyrazine, TTDPzH 2, has been prepared, in CF 3 COOH, from its corresponding Mg(II) derivative, [TTDPzMg(H 2 O)]·CH 3 COOH, which, in turn, is obtained by the reaction of magnesium(II) propylate and 3,4-dicyano-1,2,5-thiadiazole. The Mg(II) complex is also used for the prepar…
Various types of poly(aspartic acid)s, which were poly(α- l -aspartic acid), poly(α- d -aspartic acid), poly(β- l -aspartic acid), and poly(α,β- d, l -aspartic acid)s, were prepared, and their biodegradabilities using the OECD 301C method and calcium ion chelating abilities were measured to clarify the relationship be…
In a melt-miscible crystalline/amorphous polymer blend, crystallization is accompanied with the segregation of amorphous diluent. Depending on the distance of segregation, various types of segregation morphology, including interlamellar, interfibrillar, and interspherulitic, may be created. In this study, we systemati…
Synthetic green rusts, GRs, are prepared by oxidation of Fe(OH) 2 incorporating Cl -, SO 4 2-, or CO 3 2- ions. E h −pH diagrams are drawn, and thermodynamic data are derived. A GR incorporating OH - ions, GR1(OH - ), is suspected to exist like similar other M(II)−M(III) compounds. GRs form as corrosion products of st…