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An effect of hydration entropy on adsorption of various alkylammonium ions at the mercury/water interface

✍ Scribed by O. Ikeda; Y. Matsuda; H. Yoneyama; H. Tamura

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
668 KB
Volume
21
Category
Article
ISSN
0013-4686

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✦ Synopsis

The adsorption of various alkylammonium cations was investigated by measurement of the interfacial tension. Tetraethanolammonium ion (HOC,H&N+ showed weaker adsorbability than that expected from its ionic radius. The adsorbabilities (relative surface excess of cation FT, and charge of specifically adsorbed cation 4:) of the ethyl series (CLHS)nH4_nN'(~) = 0 -4), and of the methyl secles (CH3)nH4 _,N+(n = 0 -3) were directly proportional to the hydration enthalpies of these cations -AH:, but the proportionalities were different between the methyl and the ethyl series. A linear relation was, however, found between FT, and the hydration entropies -AS: without regard to the kinds of cations. A similar relation was also found between q--AS!. In conclusion, the adsorbabilities of these cations were governed by the hydration entropy, not by the hydration enthalpy.

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