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39.964 Aktuelle Fachpublikationen zum Thema temperature

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Probing the Stability of Sterically-Stabilized Polystyrene Particles by Centrifugal Sedimentation

18.09.2013 | Huai Nyin Yow; Simon Biggs, Soft Matter, 2013

The stability and sedimentation behaviour of sterically-stabilized temperature-sensitive colloidal particles has been investigated as a function of temperature and electrolyte concentration via an analytical centrifugation technique, the LUMiSizer®. The technique builds a steady particle bed at ...

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Self-assembly and Fibrillization of a Fmoc-functionalized polyphenolic amino acid

18.09.2013 | Abhijit Saha; Sreenath Bolisetty; Stephan Handschin; Raffaele Mezzenga, Soft Matter, 2013

Self-assembly of Fmoc-L-DOPA leads to the formation of twisted fibers at pH 2. Temperature dependent Circular Dichroism (CD) reveals the formation of a linear superstructure via π-π stacking. SAXS experiments together with TEM imaging confirm the existence of semi flexible twisted- multistranded ...

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Polynuclear copper(II) pyrazolate complexes: temperature-dependent protonolysis reactions, crystal structures and high catalytic activity toward the condensation of nitriles with 2-aminoalcohol

18.09.2013 | Ling Wang; Bin Guo; Hong-Xi Li; Qi Li; Hai-Yan Li; Jian-Ping Lang, Dalton Transactions, 2013

Reaction of Cu(OAc)2•H2O and 1H-pyrazole-3,5-dicarboxylic acid dimethyl ester (Hdcmpz) in MeOH at room temperature afforded one tetranuclear Cu(II)/pyrazolate complex [{Cu2(μ-OAc)2}2(μ-dcmpz)2(μ-OAc)2] (1) in 89% yield. The similar reaction in refluxing MeOH produced a hexanuclear ...

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An Efficient Palladium Catalyst on Bentonite for Suzuki-Miyaura Reaction at Room Temperature

18.09.2013 | Tao Jiang; Guodong Ding; Weitao Wang; Prof. Buxing Han, Green Chemistry, 2013

Clays are nontoxic, abundant, and cheap, which are very promising supports for designing and preparing green catalysts. In this work, Pd/Bentonite catalyst was fabricated by a simple impregnation method using water as the medium. The catalyst was characterized by powder X-ray diffraction (XRD), ...

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Thermal activation of catalytic microjets in blood samples using microfluidic chips

18.09.2013 | Lluis Soler; Cynthia S Martinez-Cisneros; Anka Swiersy; Samuel Sanchez; Oliver G. Schmidt, Lab on a Chip, 2013

We demonstrate that catalytic microjet engines can out-swim high complex media composed by red blood cells and serum. Despite the challenge presented by the high viscosity of the solution at room temperature, the catalytic microjets can be activated at physiological temperature and, consequently, ...

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Doping alkaline-earth: a strategy of stabilizing hexagonal GdF3 at room temperature

18.09.2013 | Qi Zhao; Baiqi Shao; Wei Lü; Yongchao Jia; Wenzhen Lv; Mengmeng Jiao; Hongpeng You, Dalton Transactions, 2013

Hexagonal GdF3 is a more efficient phosphor host compared with the traditional orthorhombic form but the hexagonal phase is thermodynamically unstable at room temperature. Herein, we present a strategy to stabilize hexagonal GdF3 by doping with alkaline-earth ions in a mild hydrothermal reaction ...

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Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

18.09.2013 | Gunter Heymann; Jan F. Riecken; Dirk Johrendt; Sudhindra Rayaprol; Rainer Pöttgen; Hubert Huppertz, Dalton Transactions, 2013

The oxidation of an intermetallic phase under high-pressure/high-temperature conditions led to the synthesis of Ce4Ag3Ge4O0.5 exhibiting [OCe2Ce2/2] tetrahedral chains, in which the oxygen atoms statistically occupy the tetrahedral centres. Starting from a 1 [ ] : [ ] 1 [ ] : [ ] 1 CeAgGe ...

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Room temperature C–H bond activation on a [PdI–PdI] platform

17.09.2013 | Mithun Sarkar; Henri Doucet; Jitendra K. Bera, Chemical Communication, 2013

Heteroatom assisted C–H bond activation of 2-substituted naphthyridines with solvated PdI2(CH3CN)6(BF4)2 provides bi- and trinuclear PdII cyclometalated complexes, which provide valuable insight into potential intermediates in palladium catalyzed direct arylation reactions.

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A new room temperature and solvent free carbon coating procedure for battery electrode materials

17.09.2013 | Alexandre Ponrouch; Alejandro R Goni; Moulay Tahar Sougrati; Mohamed Ati; Jean-Marie Tarascon; Jessica Nava-Avendaño ..., Energy & Environmental Science, 2013

Carbon coating on battery electrode active material powders is a common practice in order to improve their electronic conductivity and the battery calendar life by limiting side reactions (i.e. active material surface degradation and electrolyte decomposition). Such coating is currently achieved ...

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Photooxidation of Ethanol and 2-Propanol on TiO2(110): Evidence for Methyl Radical Ejection

17.09.2013 | Matthew Kershis; Michael White, Physical Chemistry Chemical Physics, 2013

The photooxidation of ethanol and 2-propanol was studied under UHV conditions on a single crystal TiO2(110) surface using a combination of temperature programmed desorption (TPD) and pump-probe laser ionization techniques. Previous studies of these reactions have shown that the first step ...

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