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43.096 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 ...

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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 ...

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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 ...

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SELECTIVE ETHERIFICATION OF [small beta]-CITRONELLENE CATALYZED BY ZEOLITE BETA

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 ...

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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) ...

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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 ...

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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 ...

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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 ...

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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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Glassy dynamics of Poly(2-Vinyl-Pyridine) brushes with varying grafting density

02.03.2015 | Nils Neubauer; René Winkler; Martin Tress; Petra Uhlmann; Manfred Reiche; Wycliffe Kipnusu; Friedrich Kremer, Soft Matter, 2015

The molecular dynamics of poly(2-vinyl-pyridine) (P2VP) brushes is measured by Broadband Dielectric Spectroscopy (BDS) in a wide temperature (250K – 440K) and broad spectral (0.1 Hz – 1 MHz) range. This is realized using nanostructured highly conductive silicon electrodes being separated by ...

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