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42.460 Aktuelle Fachpublikationen zum Thema temperature

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Energetics and Structural Evolution of Na – Ca Exchanged Zeolite A during Heating

05.03.2015 | Hui Sun; Di Wu; Xiaofeng Guo; Alexandra Navrotsky, Physical Chemistry Chemical Physics, 2015

The properties of zeolite A change significantly with sodium – calcium exchange. The impact of cation composition on the temperature – induced phase transformations and energetics for Na – Ca exchanged zeolite A was studied systematically using powder X-ray diffraction (XRD), thermogravimetric ...


A ratiometric fluorescent molecular probe for visualization of mitochondrial temperature in living cell

05.03.2015 | Mitsumasa Homma; Yoshiaki Takei; Atsushi Murata; Takafumi Inoue; Shinji Takeoka, Chemical Communication, 2015

Mitochondrial thermodynamics is the key to understanding cellular activities related to homeostasis and energy balance. Here, we report the first ratiometric fluorescent molecular probe (Mito-RTP) that is selectively localized in the mitochondria and visualize the temperature. We confirmed that ...


The reactions of N-methylformamide and N,N-dimethylformamide with OH and their photo-oxidation under atmospheric conditions: experimental and theoretical studies

05.03.2015 | Arne Joakim C. Bunkan; Jens Hetzler; Tomáš Mikoviny; Armin Wisthaler; Claus J. Nielsen; Matthias Olzmann, Physical Chemistry Chemical Physics, 2015

The reactions of OH radicals with CH3NHCHO (N-methylformamide, MF) and (CH3)2NCHO (N,N-dimethylformamide, DMF) have been studied by experimental and computational methods. Rate coefficients were determined as a function of temperature (T = 260–295 K) and pressure (P = 30–600 mbar) by the flash ...



04.03.2015 | Sambhu Radhakrishnan; Martin Purino; Konstantinos Alexopoulos; Francis Taulelle; Marie-Francoise Reyniers; Guy B. Ma ..., Green Chemistry, 2015

The etherification of β-citronellene with bioalcohols over zeolite beta was investigated using a heterogeneous catalytic process in liquid phase at an optimum temperature of 80°C. The catalyst exhibits conversions close to 50% for β-citronellene and high selectivity for the etherification ...


Fabrication of ultrathin CoMoO4 nanosheets modified with chitosan and their improved performance in energy storage device

04.03.2015 | Ramya Ramkumar; Manickam Minakshi, Dalton Transactions, 2015

Ultrathin nanosheet-assembled cobalt molybdate (CoMoO4) with a mesoporous morphology was synthesized by a urea-assisted solution combustion route at a temperature of 400 °C. The as-prepared CoMoO4 was modified using chitosan cross-linked with glutaraldehyde (glu) and employed as a cathode ...


Complex reaction networks in high temperature hydrocarbon chemistry

04.03.2015 | İbrahim Mutlay; Albeiro Restrepo, Physical Chemistry Chemical Physics, 2015

Complex chemical reaction mechanisms of high temperature hydrocarbon decomposition are represented as networks and their underlying graph topologies are analyzed as a dynamic system. As model reactants, 1,3-butadiene, acetylene, benzene, ethane, ethylene, methane, methyl isobutyl ketone (MIBK) ...


Remarkable Distinctions in the Heat-induced Phase Transition Processes of Two Poly(2-isopropyl-2-oxazoline)-based Mixed Aqueous Solutions

03.03.2015 | Tianjiao LI; Hui Tang; peiyi wu, Soft Matter, 2015

Detailed phase transition processes of poly (2-isopropyl-2-oxazoline) (PIPOZ)/ Poly (N-isopropylacrylamide) (PNIPAM) and PIPOZ/ poly (N-vinylcaprolactam) (PVCL) mixtures in aqueous solution were investigated by DSC, temperature-variable 1H-NMR, optical microscopy and FT-IR spectroscopy ...


Oxidation of germa- and stanna-closo-dodecaborate

03.03.2015 | Torben Gädt; Jörg-Alexander Dimmer; Sebastian Fleischhauer; Anita Frank; Claudia Nickl; Tobias Wütz; Klaus Eichele; ..., Dalton Transactions, 2015

The oxidation of closo-heteroborates [GeB11H11]2− and [SnB11H11]2− is presented. Upon oxidation germa-closo-dodecaborate yields a symmetrical dimer exhibiting a Ge–Ge bond between two clusters. This dimer shows sulphur insertion into the Ge–Ge bond at room temperature. In contrast, oxidation of ...


Effects of temperature on the preparation and characteristics hydroxyapatite and their adsorptive properties toward lead

03.03.2015 | Hana EL KHAL; Narjès Batis, New Journal of Chemistry, 2015

Hydroxyapatite (HAp), [Ca10(PO4)6(OH)2] was successfully synthesized by combustion method in the aqueous system containing calcium nitrate, di-ammonium phosphate and urea. The effect of calcination temperatures on composition of the HAp phase was studied using XRD, FTIR, ATD/ATG, and N2 ...


Oxygen nonstoichiometry and thermodynamic characterization of Zr doped ceria in the 1573–1773 K temperature range

03.03.2015 | M. Takacs; J. R. Scheffe; A. Steinfeld, Physical Chemistry Chemical Physics, 2015

This work encompasses the thermodynamic characterization and critical evaluation of Zr4+ doped ceria, a promising redox material for the two-step solar thermochemical splitting of H2O and CO2 to H2 and CO. As a case study, we experimentally examine 5 mol% Zr4+ doped ceria and present oxygen ...


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