Download PDF by W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.): Advances in Catalysis, Vol. 6

By W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)

ISBN-10: 0120078066

ISBN-13: 9780120078066

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Extra info for Advances in Catalysis, Vol. 6

Example text

The molecular extinction coefficient cannot be deduced from th a t in solution; it is, however, proportional t o s i l l ? 13. Apparent quantum efficiency amofthe photochcrnical (l(cwiiipobitionof fdms of stearanilide on 5 N H,SOd. The points show the experimental rcsidts; tlw full lirir is calculated from the surface dipole moment, W D , of the molecules in the film. As the film is compressed, the orientation of the aniiidc chromophore group changes. This causes both an increase in 0, and an alteration in pcg (Itideal and Mitchell, 42).

Molecular orientation in a film of y-hydroxystearic acid at high pressures. The hydroxyl group is forced out of the aqueous surface, and lactonieation by aqueous acid is slow (Davies, 22). 15. Work must be done against the pressure of the film t o push the hydroxyl group of y-hydroxystearic acid on t o the water surface. This occurs more readily if II is low. If II is very low, most of the hydroxyl groups are on the aqueous acid, and hence lactonization is rapid (Davies, 22). on or in the water (Fig.

The height of this electrical repulsive barrier is reduced greatly by any “neutral” salts (Davies and Rideal, 21). Hartley and Roe (50) in this way were able to calculate the p H of the surface. This is related to the electrical potential, $, of the surface by: pH, = pH6 + efilkT (xxi) where k is the Boltzmann constant and T the absolute temperature. The potential a t a distant point in the bulk of the solution is conventionally set a t zero. Another method of finding $ is from measurements of the surface potential, AV.

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Advances in Catalysis, Vol. 6 by W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)


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