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Über die Gleichrichtereigenschaft bipolarer Ionenaustauschermembranen
Wiley - Tập 68 Số 6 - Trang 534-540 - 1964
P. Läuger
AbstractEin Gleichrichtereffekt tritt immer dann auf, wenn zwei Phasen aneinandergrenzen, von denen die eine vorwiegend positive, die andere vorwiegend negative bewegliche Ladungsträger enthält. Ionenaustauschermembranen, welche „sandwichartig”︁ aus einer Kationenaustauscher‐ und einer Anionenaustauscherschicht zusammengesetzt sind, stellen somit ein Analogon dar zu den aus der Halbleiterphysik be... hiện toàn bộ
Deuteron NMR Study of Molecular Mobility in a Polymer Model Membrane
Wiley - Tập 89 Số 11 - Trang 1208-1214 - 1985
Rainer Ebelhäuser, Hans Wolfgang Spieß
AbstractThe molecular mobility of a polymer model membrane is studied by 2H NMR. The lipid analogue consists of a quaternary ammonium ion, to which a methacryloylic moiety is attached via a spacer to the hydrophilic head group. A methylene group of the spacer, the methyl‐head group and methylene groups in the 1‐, 2‐, and 7‐position of the lipid chains are selectively deuterated. Temperature depend... hiện toàn bộ
A Combined Flash Photolysis/Shock‐Tube Study of the Absolute Rate Constants for Reactions of the Hydroxyl Radical with CH4 and CF3H around 1300 K
Wiley - Tập 82 Số 4 - Trang 409-414 - 1978
Jennifer Ernst, H. Gg. Wagner, R. Zellner
AbstractA combined flash photolysis/shock‐tube technique for the direct investigation of the rates of bimolecular reactions of the OH radical at temperatures between 1000‐1500 K is described. In this technique shock heated mixtures of approximately 0.5% of H2O in Ar and containing small amounts of a selected reactant, are subjected to flash photolysis as an instantaneous source of OH. The shock wa... hiện toàn bộ
A Kinetic Study About the Reactions of NH2(X̄2B1) Radicals with Saturated Hydrocarbons in the Gas Phase
Wiley - Tập 99 Số 6 - Trang 863-869 - 1995
G. R. Hennig, H. Gg. Wagner
AbstractThe reactions of NH2(X̄2B1) with the hydrocarbons methane (1), ethane (2) and propane (3) were investigated behind incident shock waves at temperatures between 1500 K and 2100 K. The decay of NH2 was measured by laser absorption. NH2 was formed by the thermal decomposition of hydrazine. The following rate constants were obtained for the temperature range mentioned:k1 = (1.2±0.6)·1013 exp(‐... hiện toàn bộ
Hydrogen Abstraction Reactions by NH2(X̄2B1)‐Radicals from Hydrocarbons in the Gas Phase
Wiley - Tập 91 Số 7 - Trang 700-708 - 1987
J. Ehbrecht, W. Hack, P. Rouveirolles, H. Gg. Wagner
AbstractRate constants for the reactions of the NH2(X2B1) radical with ethane, propane and cyclohexane were measured in an isothermal flow system. Kinetic data were obtained at 4 mbar helium pressure in the high temperature range given below. [NH2](t)‐profiles were mapped at pseudo‐first order conditions [NH2]0→[RH]0 with the laser induced fluorescence technique. The temperature dependance of the ... hiện toàn bộ
Hydrogen Abstraction Reactions by NH2(X̃2B1)‐Radicals from Hydrocarbons in the Gas Phase
Wiley - Tập 90 Số 12 - Trang 1210-1219 - 1986
W. Hack, H. Kurzke, P. Rouveirolles, H. Gg. Wagner
AbstractThe NH2(X̃2B1) radical reactions with saturated hydrocarbons, toluene and acetaldehyde were investigated in an isothermal discharge flow system over the given temperature ranges. The pressure was varied between 2.6 and 7.8 mbar. Helium was used as the main carrier gas. The temperature dependences of the rates are represented by the following Arrhenius expressions, with A in [cm3 mol−1 s−1 ... hiện toàn bộ
Absolute measurements of the thermal conductivity of liquids at pressures up to 500 MPa
Wiley - Tập 85 Số 4 - Trang 340-347 - 1981
J. Menashe, W. A. Wakeham
AbstractAn apparatus for the accurate measurement of the thermal conductivity of liquids is described. The instrument, which is of the transient hot‐wire type, operates over the pressure range 0.1 to 700 MPa and the temperature range 20–200°C. The precision of the thermal conductivity measurements is estimated to be one of ±0.2% over the entire range. — Experimental data are reported for the therm... hiện toàn bộ
Die katalytische Aktivität des Raneynickels bezüglich der Wasserstoffaktivierung in Abhängigkeit vom Oxydationszustand
Wiley - Tập 68 Số 3 - Trang 250-266 - 1964
A. Kalberlah, A. Winsel
AbstractEs werden experimentelle Untersuchungen an H2‐Diffusionselektroden mit Raneynickel als Katalysator (DSK‐Elektroden) beschrieben. Durch Überlastung oder durch Entladung bei abgeschalteter Wasserstoffzufuhr wird dem Katalysator ein vom Gleichgewichtszustand abweichender Oxydationszustand aufgezwungen und die katalytische Wirksamkeit durch Vergleich von Stromlieferung und Gaszufluß ermittelt.... hiện toàn bộ
The Dynamic Structure Factor of Expanded Liquid Rubidium
Wiley - Tập 95 Số 9 - Trang 1133-1136 - 1991
C. Pilgrim, Roland Winter, F. Hensel, C. Morkel, W. Gläser
AbstractBy inelastic neutron scattering, the coherent dynamic structure factor S(Q, ω) of expanded liquid rubidium has been measured up to about 1700 K using the IN6 spectrometer at the Institut Laue‐Langevin, Grenoble. The scattering law S(Q,ω) has been determined for energy transfers from −3.5 to 20 meV in the momentum transfer region from 0.55 Å−1 to 2.6 Å−1. The existence of collective density... hiện toàn bộ
On Coulombic and Solvophobic Liquid‐Liquid Phase‐Separation in Electrolyte Solutions
Wiley - Tập 95 Số 12 - Trang 1579-1586 - 1991
Hermann Weingärtner, Thomas Merkel, Ulrich Maurer, Jörg‐Peter Conzen, H. Glasbrenner, Stefan Käshammer
AbstractWe have performed a systematic study of liquid‐liquid phase equilibria in aqueous and non‐aqueous solutions of tetraalkylammonium salts up to about 500 K, covering a large number of hydrogen‐bonding, dipolar aprotic and non‐polar solvents. There appear to be two different types of liquid‐liquid phase equilibria resulting from long‐range Coulombic and from short‐range specific forces, respe... hiện toàn bộ
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