摘要:

AbstractIn the presence of pyridine or quinoline monoacylglycols and diphenyl chlorophosphate react smoothly at room temperature, with the formation ofacylglycolphosphoric acid diphenyl esters.Upon hydrogenolysis the latter substances yield theacylglycolphosphoric acidand cyclohexane.Some properties of these new types of compounds are discussed.

ISSN:0165-0513    

DOI:10.1002/recl.19530720502

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractMeasurements on the redox‐system methylene blue‐leuco‐base of methylene blue in water and the same system containing active carbon lead to the conclusion that adsorbed methylene blue shows markedly different properties. The reduction of adsorbed methylene blue by TiCl3is hin

ISSN:0165-0513    

DOI:10.1002/recl.19530720503

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractPreparation of pure white ferrous hydroxide; determination of its magnetic susceptibility (χ = 11 200 × 10−6at 28.4°); also of the more or less oxidized pro

ISSN:0165-0513    

DOI:10.1002/recl.19530720504

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractThe present paper describes the synthesis of the seven possible glycerophosphatidic acids (formulae IX‐XII) containing palmitic and/or stearic acid as component acids, by the hydrogenolysis of the corresponding diphenyl esters with hydrogen in the presence of a platinum/active carbon catalyst. The diphenyl esters are obtained by the action of diphenyl chlorophosphate on the monoacid and diacid αβ‐ and αγ‐diglycerides in the presence of an excess of pyridine.Some properties of the glycerophosphatidic acid diphenyl esters and the glycerophosphatidic acids are

ISSN:0165-0513    

DOI:10.1002/recl.19530720505

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractThree new macrocyclic oxalactones have been prepared. Their synthesis and properties are described, and a new technique for the preparation of ω‐bromo‐alkanols is introd

ISSN:0165-0513    

DOI:10.1002/recl.19530720506

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractThe electrostatic interaction between charged oil globules in water is determined by the potential drop at the aqueous side of the interface. This potential drop is, under the conditions of the present investigation, practically entirely determined by the amount of adsorbed soap ions and the electrolyte concentration in the aqueous phase. A model is described according to which the charge in the diffuse layer is compensated by the charge of the adsorbed soap anionsminusthe charge of the counter‐ions situated between the ionic heads of the adsorbed soap ions. The capacity of the double layer in the oil phase may be neglected.The amount of adsorbed soap ions has been determined by measuring the dependency of the interfacial tension on the soap concentration, followed by application of the Gibbs adsorption isotherm. The potential drop at the aqueous side of the interface has been calculated; it was found to be practically independent on the soap concentration in the range of concentrations investigated. The potential drop is decreased by increasing the salt concentration; the effect of an addition of salt on the potential drop is strongly dependent on the valency of the counter ions.Determination of the zeta‐potential by measurement of electrophoretic mobility of oil droplets indicates that the values of the surface potential as calculated are of the right order of magnit

ISSN:0165-0513    

DOI:10.1002/recl.19530720507

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

摘要:

AbstractThe colloidal stability of an oil‐in‐water emulsion can be correlated with the well‐known behaviour of the hydrophobic sols of solid particles if the rate of coagulation is expressed in terms of a decrease in particle concentration.Coagulation of an emulsion occurs in two stages, called flocculation and coalescence. Flocculation is assumed to occur according to the second order reaction process applied byVon Smoluchowskito the similar phenomenon in the hydrophobic sols of solid particles. Coalescence is a first order reaction and will only occur between adjacent drops in an aggregate.An equation is derived in which the particle concentration is expressed as a function of both the rate of flocculation and the rate of coalescence, and the time of coagulation. The rate of coagulation appears to depend upon the particle concentration, in such a way that the rate of increase of 1/n increases with decreasing initial particle concentration. Approximations are given which may be applied to cases of practical impor

ISSN:0165-0513    

DOI:10.1002/recl.19530720508

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19530720501

出版商:WILEY‐VCH Verlag    

年代:1953

数据来源: WILEY