Adsorption of aliphatic amines at the solution/mercury and solution/air interface: DI-n-butylamine

✍ Scribed by G. Borghesani; C. Locatelli; R. Pedriali; F. Pulidori

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 555 KB
• Volume: 30
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(85)80080-3

✦ Synopsis

Abstracttiomparison of-the adsorption of di-n-butylamine at the Hg/solution and the air/solution interface has been carried out by means of interfacial and surface tension measurements. Adsorption has been found to follow a Frumkin isotherm with an attractive interaction parameter at both interfaces. Experimental results on mercury electrode are in better agreement with an electrical model of two capacitors in parallel. The relevant electrosorption parameters of DNBA are very close to those typical of linear monofunctional compounds with a number of C atoms 2 4. adsorbing almost perpendicularly to the Hg surface, with the polar group facing the solution. The orientation of DNBA is practically independent of the nature of the interface. Adsorption is stronger at the metal/solution interface than at the free surface of the solution. This is explained in terms of 'imaging effects" of DNBA adsorbed dipoles which enhance the electronic effects at the metal surface.