摘要:

AbstractThe interaction of tetraethyl‐lead vapour and gaseous hydrogen telluride has been investigated and the conditions found under which lead telluride mirrors can be formed. A reaction mechanism is postulated to account for the by‐products obtained. A range of conditions has been found over which lead and tellurium mirrors may be formed individually from the vapours on a mica substrate. The preparation of hydrogen telluride by a lithium aluminium hydride reaction was not very satisfactory owing to the unstable nature of the

ISSN:0021-8871    

DOI:10.1002/jctb.5010110201

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractLiquid‐liquid equilibrium data at 25° are presented for the ternary systems formed by cupric, cobalt and zinc nitrates, water and the solvents n‐butanol and pentanol and also for the systems nickel nitrate‐water‐n‐butanol and cobalt nitrate‐nickel nitrate‐water‐n‐butanol. Correlations are developed for relating the compositions and solute concentrations in the phases in equilibrium for ternary nitrate systems by empirical equations based on the thermodynamic equilibrium relationship. Equilibrium data in the system cobalt nitrate‐nickel nitrate‐water‐n‐butanol can be predicted from relationships based o

ISSN:0021-8871    

DOI:10.1002/jctb.5010110202

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractThe dissolution rates of aluminium in aqueous and dioxan solutions of hydrochloric acid have been determined by hydrogen evolution measurements. In aqueous HCl solutions the rate increases to a maximum, then decreases, paralleling progressive solution of the oxide film and emergence of a less reactive cubic etch relief. In water‐rich solutions the rate is proportional to the partial vapour pressure of HCl, indicating a reaction dependent on the square of the mean ionic activity of HCl, i.e.,aH+×ac1−. In 100% dioxan, the reaction appears to proceed by a free‐radical mechanism, inhibited by water.At critical solution compositions, determined by two particular values of the mole fraction ratio of water to HCl, there is an abrupt decrease in reaction rate. This apparent influence of water is explained by the necessity for the Al3+ion to be fully hydrated before it can enter so

ISSN:0021-8871    

DOI:10.1002/jctb.5010110203

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractRates of solution of zinc in aqueous and dioxan solutions of hydrochloric acid are determined by weight loss and hydrogen evolution measurements. It is shown that the reaction between zinc and HCl in aqueous solutions is partly controlled by diffusion processes. With stirring sufficiently vigorous to eliminate this effect the rate is proportional to the mean ionic activity of HCl, and this is consistent with direct participation of chloride ions in the anodic reaction. Dioxan causes a change of reaction mechanism due, it is suggested, to its adsorption on the metal surface, inhibition of normal electrode processes, and promotion of a direct reaction between zinc and HCl molecules.

ISSN:0021-8871    

DOI:10.1002/jctb.5010110204

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

ISSN:0021-8871    

DOI:10.1002/jctb.5010110205

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

ISSN:0021-8871    

DOI:10.1002/jctb.5010110206

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractA new synthesis of phthalazine has been effected by reduction of the commercially available 1‐hydrazinophthalazine hydrochloride. The preparation of quinazoline in three steps from anthranilic acid on a large laboratory scale is described. It is believed that these are the most convenient syntheses available for phthalazine and quinazolin

ISSN:0021-8871    

DOI:10.1002/jctb.5010110207

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY

摘要:

AbstractAn examination has been made of the results obtained by the Marshall test to determine the value of the test for the design of dense bituminous mixtures for road surfacings and for comparing their resistance to deformation.It is shown that the optimum binder contents obtained from the density and stability curves are similar to those specified in B.S.594 for the driest schedules having the highest resistance to deformation and that the test would exclude those materials in the other schedules. In the absence of information on the relative deformation on roads of surfacings made with different types of bituminous material, simulative laboratory tests have been used to place compositions in order of resistance to deformation. Comparison of the results of the Marshall test with the Road Research Laboratory wheel‐tracking tests shows that neither the stability nor the flow value provides a valid measure of the resistance to deformation of dense bituminous materials in common use. However, for rolled asphalts the ratio stability/flow correlates moderately well with the logarithm of the rate of tracking measured in the wheel‐tracking machine; the correlation for dense tar surfacing compositions is poor. Comparison with the Hveem Stabilometer suggests that setting an upper limit on flow value is approximately equivalent to setting a lower limit on the internal friction. As with many mechanical tests, high Marshall stability values are promoted by high stone content, high viscosity of binder, rough‐textured aggregate, not too low a filler content and good compa

ISSN:0021-8871    

DOI:10.1002/jctb.5010110208

出版商:John Wiley&Sons, Ltd    

年代:1961

数据来源: WILEY