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5.114 Aktuelle Fachpublikationen zum Thema temperature

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DNA encapsulated chain and wire-like [small beta]-MnO2 organosol for oxidative polymerization of pyrrole to polypyrrole

01.03.2015 | Sivasankara Rao Ede; S Anantharaj; U Nithiyanantham; Subrata Kundu, Physical Chemistry Chemical Physics, 2015

DNA encapsulated chain and wire-like β-MnO2 organosol had been synthesized utilizing a two phase water-toluene extraction procedure at room temperature (RT). The β-MnO2 organosol was prepared by transferring KMnO4 and the DNA from aqueous solution separately to the organic (toluene) solvent by ...

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Catalytic hydrogen production from paraformaldehyde and water using an organoiridium complex

28.02.2015 | Tomoyoshi Suenobu; Yusuke Isaka; Satoshi Shibata; Shunichi Fukuzumi, Chemical Communication, 2015

Paraformaldehyde was decomposed using an organoiridium complex (1, [IrIII(Cp*)(4-(1H-pyrazol-1-yl-κN2)benzoic acid-κC3)(H2O)]2SO4) as a catalyst in water to produce H2 and CO2 in a 2 [ ] : [ ] 1 molar ratio at room temperature. The catalytic cycle is composed of the reduction of 1 by ...

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Dielectric study of insulin-loaded reverse hexagonal (HII) liquid crystals

27.02.2015 | Tehila Mishraki; Paul Ben Ishai; Abraham Aserin; Yuri Feldman; Nissim Garti, Physical Chemistry Chemical Physics, 2015

The dielectric behavior of insulin-loaded HII mesophase (containing GMO/TAG/water/glycerol/insulin) was studied using two empty reference systems (GMO/TAG/water and GMO/TAG/water/glycerol) at a frequency range of 10-2–107 Hz, and temperature range of 290–333 K. Three clearly defined relaxation ...

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Post-synthesis functionalization of a zeolitic imidazolate structure ZIF-90: a study on removal of Hg(II) from water and epoxidation of alkenes

25.02.2015 | Samiran Bhattacharjee; Yu-Ri Lee; Wha-Seung Ahn, CrystEngComm, 2015

Thiol-functionalized ZIF-90 (ZIF-90-SH) and its Mn(II)-immobilized form (ZIF-90-S[Mn]) were prepared. The former exhibited an Hg2+ adsorption capacity of ca.22.4 mgg-1 at room temperature and ZIF-90-S[Mn] showed good catalytic performance in the epoxidation of several important alkenes using ...

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Self-temperature-compensative refractometer based on singlemode–multimode–singlemode fiber structure

22.02.2015 | Author(s): Yaofei Chen , Qun Han , Tiegen Liu , Xiaoying Lü, Sensors and Actuators B: Chemical, 2015

Publication date: June 2015 Source:Sensors and Actuators B: Chemical, Volume 212 Author(s): Yaofei Chen , Qun Han , Tiegen Liu , Xiaoying Lü It is important to precisely measure the refractive index (RI) of liquids with the variation of temperature in many chemical and biological ...

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Xylose Isomerization with Zeolites in a Two‐Step Alcohol–Water Process

20.02.2015 | Marta Paniagua, Shunmugavel Saravanamurugan, Mayra Melian‐Rodriguez, Juan A. Melero, Anders Riisager, ChemSusChem, 2015

Abstract Isomerization of xylose to xylulose was efficiently catalyzed by large‐pore zeolites in a two‐step methanol–water process that enhanced the product yield significantly. The reaction pathway involves xylose isomerization to xylulose, which, in part, subsequently reacts with methanol to ...

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Governing Chemistry of Cellulose Hydrolysis in Supercritical Water

20.02.2015 | Danilo A. Cantero, M. Dolores Bermejo, M. José Cocero, ChemSusChem, 2015

Abstract At extremely low reaction times (0.02 s), cellulose was hydrolyzed in supercritical water (T=400 °C and P=25 MPa) to obtain a sugar yield higher than 95 wt %, whereas the 5‐hydroxymethylfurfural (5‐HMF) yield was lower than 0.01 wt %. If the reaction time was increased to 1 s, the ...

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Single Chain Structure of a Poly(N-isopropylacrylamide) Surfactant in Water

20.02.2015 | Lauren J. Abbott; Ashley K. Tucker; Mark J. Stevens, Journal of Physical Chemistry B, 2015

We present atomistic simulations of a single PNIPAM–alkyl copolymer surfactant in aqueous solution at temperatures below and above the LCST of PNIPAM. We compare properties of the surfactant with pure PNIPAM oligomers of similar lengths, such as the radius of gyration and solvent accessible ...

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Thermodynamics of Water Dimer Dissociation in the Primary Hydration Shell of the Iodide Ion with Temperature-Dependent Vibrational Predissociation Spectroscopy

20.02.2015 | Conrad T. Wolke; Fabian S. Menges; Niklas Tötsch; Olga Gorlova; Joseph A. Fournier; Gary H. Weddle; Mark A. Johnson; ..., Journal of Physical Chemistry A, 2015

The strong temperature dependence of the I–·(H2O)2 vibrational predissociation spectrum is traced to the intracluster dissociation of the ion-bound water dimer into independent water monomers that remain tethered to the ion. The thermodynamics of this process is determined using van’t Hoff ...

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An Interconverting Family of Coordination Cages and a meso-Helicate; Effects of Temperature, Concentration, and Solvent on the Product Distribution of a Self-Assembly Process

20.02.2015 | William Cullen; Christopher A. Hunter; Michael D. Ward, Inorganic Chemistry, 2015

The self-assembly between a water-soluble bis-bidentate ligand L18w and Co(II) salts in water affords three high-spin Co(II) products: a dinuclear meso-helicate [Co2(L18w)3]X4; a tetrahedral cage [Co4(L18w)6]X8; and a dodecanuclear truncated-tetrahedral cage [Co12(L18w)18]X24 (X = BF4 or ClO4). ...

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