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1.717 Aktuelle Fachpublikationen zum Thema temperature

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Synthesis and Characterization of 5‐Cyanotetrazolide‐Based Ionic Liquids

11.12.2014 | Timm Bergholz, Benjamin Oelkers, Benedikt Huber, Bernhard Roling, Jörg Sundermeyer, Chemistry - A European Journal, 2014

Abstract New salts based on imidazolium, pyrrolidinium, phosphonium, guanidinium, and ammonium cations together with the 5‐cyanotetrazolide anion [C2N5]− are reported. Depending on the nature of cation–anion interactions, characterized by XRD, the ionic liquids (ILs) have a low viscosity and ...

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Self‐Regulation Mechanism for Charged Point Defects in Hybrid Halide Perovskites

11.12.2014 | Aron Walsh, David O. Scanlon, Shiyou Chen, X. G. Gong, Su‐Huai Wei, Angewandte Chemie International Edition, 2014

Abstract Hybrid halide perovskites such as methylammonium lead iodide (CH3NH3PbI3) exhibit unusually low free‐carrier concentrations despite being processed at low‐temperatures from solution. We demonstrate, through quantum mechanical calculations, that an origin of this phenomenon is a ...

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Poly‐2‐[(4‐methylbenzylidene)amino]phenol: Investigation of thermal degradation and antimicrobial properties

11.12.2014 | Nuray Yılmaz Baran, Hacı Ökkeş Demir, Sedat Kostekçi, Mehmet Sacak, Journal of Applied Polymer Science, 2014

ABSTRACT A new polyphenol (poly‐2‐[(4‐methylbenzylidene)amino]phenol) (P(2‐MBAP)) containing an azomethine group was synthesized by oxidative polycondensation reaction of 2‐[(4‐methylbenzylidene)amino]phenol (2‐MBAP) with NaOCl, H2O2, and O2 oxidants in an aqueous alkaline medium. The ...

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Physical Properties and CO2 Reaction Pathway of 1-Ethyl-3-Methylimidazolium Ionic Liquids with Aprotic Heterocyclic Anions

11.12.2014 | Samuel Seo; M. Aruni DeSilva; Joan F. Brennecke, Journal of Physical Chemistry B, 2014

Ionic liquids (ILs) with aprotic heterocyclic anions (AHA) are attractive candidates for CO2 capture technologies. In this study, a series of AHA ILs with 1-ethyl-3-methylimidazolium ([emim]+) cations were synthesized, and their physical properties (density, viscosity, and ionic conductivity) ...

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Concentration of Charge Carriers, Migration, and Stability in Li3OCl Solid Electrolytes

09.12.2014 | Rodolpho Mouta; Maria Águida B. Melo; Eduardo M. Diniz; Carlos William A. Paschoal, Chemistry of Materials, 2014

Recently, a new family of lithium-rich antiperovskites, Li3OA (A = halogen), which presents superionic conductivity, emerged as a promising both safe and commercially applicable solid electrolyte for lithium ion batteries. In this paper we employed classical atomistic quasi-static calculations to ...

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Spin–Orbit Interaction in a Two-Dimensional Hole Gas at the Surface of Hydrogenated Diamond

08.12.2014 | Mark T. Edmonds; Laurens H. Willems van Beveren; Oleh Klochan; Jiri Cervenka; Kumar Ganesan; Steven Prawer; Lothar L ..., Nano Letters, 2014

Hydrogenated diamond possesses a unique surface conductivity as a result of transfer doping by surface acceptors. Yet, despite being extensively studied for the past two decades, little is known about the system at low temperature, particularly whether a two-dimensional hole gas forms at the ...

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Photoliquefiable Ionic Crystals: A Phase Crossover Approach for Photon Energy Storage Materials with Functional Multiplicity

05.12.2014 | Keita Ishiba, Masa‐aki Morikawa, Chie Chikara, Teppei Yamada, Katsunori Iwase, Mika Kawakita, Nobuo Kimizuka, Angewandte Chemie International Edition, 2014

Abstract Ionic crystals (ICs) of the azobenzene derivatives show photoinduced IC–ionic liquid (IL) phase transition (photoliquefaction) upon UV‐irradiation, and the resulting cis‐azobenzene ILs are reversibly photocrystallized by illumination with visible light. The photoliquefaction of ICs is ...

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Sensors, Vol. 14, Pages 23348-23364: Design and Application of New Low-Cost Instruments for Marine Environmental Research

05.12.2014 | Marcelli, Marco ; Piermattei, Viviana ; Madonia, Alice ; Mainardi, Umberto, Sensors, 2014

The development of low-cost instrumentation plays a key role in marine environmental studies and represents one of the most innovative aspects of current oceanographic research. These kinds of devices can be used for several applications, ranging from vertical profilers to stand-alone systems, ...

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Shear- and Temperature-Induced Graphene Network Evolution in Graphene/Polystyrene Nanocomposites and Its Influence on Rheological, Electrical, and Morphological Properties

04.12.2014 | F. Beckert; A. Held; J. Meier; R. Mülhaupt; C. Friedrich, Macromolecules, 2014

Herein we report on the characterization of rheological, morphological, and electrical properties of graphene/polystyrene nanocomposites as a function of graphene functionalization. Hydrophobic modified graphite oxide was grafted with polystyrene chains (PS-g-FG), thus enabling a high degree of ...

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Ambient Scalable Synthesis of Surfactant-Free Thermoelectric CuAgSe Nanoparticles with Reversible Metallic-n-p Conductivity Transition

04.12.2014 | Chao Han; Qiao Sun; Zhen Xiang Cheng; Jian Li Wang; Zhen Li; Gao Qing (Max) Lu; Shi Xue Dou, Journal of the American Chemical Society, 2014

Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric ...

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