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41.886 Aktuelle Fachpublikationen zum Thema temperature

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Custom designed nanocrystalline Li2MSiO4/reduced graphene oxide (M=Fe, Mn) formulations as high capacity cathodes for rechargeable lithium batteries

29.10.2014 | D Bhuvaneswari; Kalaiselvi Nallathamby, Dalton Transactions, 2014

Abstract: Nanocrystalline Li2MSiO4 (M=Fe, Mn) particles embedded between in-situ formed rGO sheets are obtained by adopting customised solvothermal synthesis. An appreciable room temperature specific capacity of 149 mAh g-1 with 89% capacity retention and 210 mAh g-1 with 87% retention have been ...

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Room temperature electrochemical synthesis of N-doped Graphene and its electrocatalytic activity for oxygen reduction

29.10.2014 | Feng-Xiang Ma; Jiong Wang; Feng-bin Wang; Xinghua Xia, Chemical Communication, 2014

We report a facile and green electrochemical method using graphene oxide as precursor to synthesize nitrogen doped graphene at room temperature in ammonia containing aqueous solution. The nitrogen doping content reaches of 3.3 at%, and the resultant NG shows excellent activity toward oxygen ...

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Cu/ZnO Nanocatalysts in Response to Environmental Conditions: Surface Morphology, Electronic Structure, Redox State and CO2 Activation

29.10.2014 | Luis Martínez-Suárez; Johannes Frenzel; Dominik Marx, Physical Chemistry Chemical Physics, 2014

Methanol synthesis is one of the landmarks of heterogeneous catalysis due to the great industrial significance of methanol as a clean liquid fuel and as a raw material for industry. Understanding in atomistic detail the properties of the underlying metal/oxide catalyst materials as a function of ...

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Hydrogen-bond Structure and Anharmonicity in Croconic Acid

29.10.2014 | Sanghamitra Mukhopadhyay; Matthias J Gutmann; Felix Fernandez-Alonso, Physical Chemistry Chemical Physics, 2014

First-principles molecular dynamics simulations and neutron-scattering experiments have been employed to investigate the structure and underlying vibrational motions in croconic acid as a function of temperature over the range 4-400K. Calculated hydroxyl-bond distances were within 4 % of the ...

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Etching of glass microchips with supercritical water

28.10.2014 | P. Karásek; Jakub Grym; M. Roth; Josef Planeta; Frantisek Foret, Lab on a Chip, 2014

A novel method of etching channels in glass microchips with the most tunable solvent, water, was tested as an alternative to common hydrogen fluoride-containing etchants. The etching properties of water strongly depend on temperature and pressure, especially in the vicinity of the water critical ...

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Effects of Thermal Disorder on Electronic Properties of Ordered Polymers

28.10.2014 | Marko Mladenovic; Nenad Vukmirovic, Physical Chemistry Chemical Physics, 2014

The effects of thermal disorder on electronic properties of crystalline polymers were investigated. Atomic configurations of the material were obtained using classical Monte Carlo simulations at room temperature, while electronic structure calculations were performed using density functional ...

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Hydrogen storage in Platinum decorated Hydrogen Exfoliated Graphene sheets by spillover mechanism

28.10.2014 | Sundara Ramaprabhu; Puthusseri Divya, Physical Chemistry Chemical Physics, 2014

Development of lightweight materials with high hydrogen storage capacity at ambient temperature is a great challenge in the hydrogen economy. Here, we report high-pressure hydrogen adsorption-desorption studies of platinum nanoparticles decorated hydrogen exfoliated graphene (Pt-HEG). Pt-HEG ...

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Manipulating and quantifying temperature-triggered coalescence with microcentrifugation

28.10.2014 | Huanhuan Feng; Dmitry Ershov; Thomas Krebs; Karin Schroen; Martien A. Cohen Stuart; Jasper van der Gucht; Joris Sprakel, Lab on a Chip, 2014

In this paper we describe a new approach to quantify the stability and coalescence kinetics of thermally switchable emulsions using an imaging-based microcentrifugation method. We first show that combining synchronized high-speed imaging with microfluidic centrifugation allows the direct ...

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Rational design of a room temperature molecular spin switch. The light-driven coordination induced spin state switch (LD-CISSS) approach

28.10.2014 | M. Dommaschk; C. Schütt; S. Venkataramani; U. Jana; C. Näther; F. D. Sönnichsen; R. Herges, Dalton Transactions, 2014

Extensive use of quantum chemical calculations has been made to rationally design a molecule whose spin state can be switched reversibly using light of two different wavelengths at room temperature in solution. Spin change is induced by changing the coordination number of a nickel complex. The ...

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Fluorescent Polymers from Non-Fluorescent Photoreactive Monomers

28.10.2014 | Jan Mueller; Dominik Voll; Friedrich Schmidt; Guillaume Delaittre; Christopher Barner-Kowollik, Chemical Communication, 2014

A facile, fast and ambient-temperature avenue towards highly fluorescent polymers is introduced via polymerizing non-fluorescent photoreactive monomers based on light-induced NITEC chemistry, providing a platform technology for fluorescent polymers. The resulting polypyrazolines were analyzed in ...

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