ISSN:0005-9021    

DOI:10.1002/bbpc.19820860102

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractThe thermal unimolecular decomposition of methanol was investigated behind reflected shock waves in the temperature range 1600 to 2100 K, using argon as a diluent and monitoring CH3‐and OH‐absorption signals. —Methanol decomposes in the main channel according toThe reaction takes place in the fall off region when total densities are varied from 1.1 · 10‐6to 5.6·10−65.6·10‐5mol/cm3. Using the theory of unimolecular reactions the rate constantsin the high pressure limit andin the low pressure limit could be obtained. A computer simulation of the decomposition of methanol and the consecutive reactions w

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860103

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractThe kinetics and mechanism of the mercury‐photosensitized decomposition of hexamethyldisilane have been studied. It has been confirmed that the initially‐formed radical, Me3SiSi(Me2)CH2, undergoes a unimolecular rearrangement; Arrhenius parameters have been measured for this rearrangement and for subsequent reactions of the rearranged radical:The significance of these Arrhenius parameters in silicon chemistry is discussed by means of thermochemical calculati

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860104

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractThe creation of an inverted surface region at an n‐type MoSe2electrode is demonstrated by two different experimental techniques. In one technique the ac conductivity of a thin electrolyte layer in contact with a MoSe2single crystal was determined where the surface of the MoSe2behaves like a parallel shunt resistor. Injection of minority carriers by oxidized thianthrene induced a substantial increase in the surface conductivity of the MoSe2. In the second technique, the impedance of the MoSe2electrode was determined over the frequency range of 100 to 50000 Hz. A plot of the impedance in the complex plane showed that the low frequency limit of the ohmic impedance component dramatically decreases in contact with oxidized thianthrene. This can also be interpreted as an indication for the formation of an inversion laye

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860105

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractMelting curves, viscosities and densities have been determined for the mixtures of 1,2,4‐trichlorobenzene + n‐decane and + n‐tetradecane. Derived thermodynamic excess properties (excess Gibbs energygEand excess volumevE) can be combined with literature data on trichlorobenzene + n‐alkane systems to establish an unusual trend of mixing properties with chain length of n‐alkane. Also viscosities of equimolar mixtures of trichlorobenzene with various n‐alkanes and of benzene with various n‐alkanes have been measured, in order to collect more material on the behaviour of n‐

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860106

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractFor calculations on distillation processes it is necessary to know the vapor‐liquid‐equilibrium (VLE) data at the desired temperature range. Very often data are available only for different temperature ranges. Therefore it is necessary to convert the VLE data from one temperature range to another.—The excess functions of the various types of mixtures have very different temperature dependence. Therefore we classified the mixtures according to the temperature dependence of the excess Gibbs energy and the excess enthalpy. The thermodynamic properties of the mixtures of organic compounds exhibit remarkable regularities.—In the case of non‐associated mixtures the excess Gibbs energy and the excess entropy are directly proportional to the excess enthalpy. Here simple expressions for describing the temperature dependence of the excess functions could be obtainedThe temperature dependence of the excess functions of the associated mixtures can be described by the Chemical Theory of Solutions.—The analysis of the available thermodynamic data shows that our classification serves a two‐fold purpose. First it is very useful for estimating the temperature dependence of excess functions. Second it shows how an analysis of theGEvs.HE(T) curves may enhance the general understanding of interaction

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860107

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractSmall angle neutron scattering (SANS) measurements have been carried out on aqueous solutions of Cetylpyridinium‐Salicylate (CPySal). The data show the existence of rodlike micelles with the lengthLand the radiusR.The radiusRof 21.5 A is independent of the detergent concentration while theL‐values increase with increasing concentration. For 10 mM solutions the micelles show considerable nearest neighbour or

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860108

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractThe oxidation of CO over the silver‐vanadium bronze ß‐Ag0.35V2O5was studied between 150 and 550 °C in a continuous flow reactor. Results show that the catalytic activity of Ag0.35V2O5is strongly influenced by its pretreatment; partial surface reduction leads to a high oxidation activity. Evaluation of the kinetic parameters leads to the conclusion that at temperatures above 450°C the activity of Ag0.35V2O5can be described with a defect V2O5‐like structure.—Furthermore, carbon is deposited on the catalyst near 375 °C in excess oxygen atmosphere due to disproportionation of CO which leads to a low activity. A model is proposed for the reoxidation of carbon by adsorbed water to CO and H2near 200 °C. This reaction results in an enhancement of the low‐temperature oxidation activity

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860109

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractIn a thermocell containing two silver electrodes the stationary state of thermal diffusion in the systems of molten KNO3+ AgNO3, RbNO3+ AgNO3, and CsNO3+ AgNO3is measured at 513 K, 533 K, and 563 K as a function of the composition of the mixture. These measurements provide the thermoelectric power ε∞(of the steady state) which depend linearly on temperature at a given composition. Thus it is possible to combine the ε∞‐values, extrapolated to higher temperatures, with the published ε∞‐values (thermoelectric power of the initial state) at 633 K and to compute the transport quantities of non‐isothermal melts in the temperature range from 493 K to 633 K. The transported entropies of the two ion constituents, a linear combination of the heats of transport of the same constituents, and the Soret coefficients of the three liquid systems mentioned are discussed, in connection with the same quantities for the systems LiNO3+ AgNO3and NaNO3+ AgNO3, evaluated in a previous paper, thus leading to a complete investigation of the alkali n

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860110

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY

摘要:

AbstractThe mean collision time 〈τC〉 and the mean durations of collision 〈τD〉 in liquid argon were calculated by a molecular dynamics computer simulation. The calculations were performed from the triple point temperature ofT= 83.81 K toT= 150 K. The collision ratesZwere obtained under isothermal, isochoric and isobaric conditions and the corresponding derivativesas well as the isokinetic coefficienthave been calculated for our model and for liquid cell models. The use of the coefficients thus introduced for the calculation of frequency factors in solution kinetics is discussed. A comparison with collision induced spectra shows that the calculated values of 〈τC〉 and 〈τD〉 are in agreement with experimental d

ISSN:0005-9021    

DOI:10.1002/bbpc.19820860111

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1982

数据来源: WILEY