Adsorption of poly-DL-alanine at the mercury-solution interface

✍ Scribed by Setsuko Nakamura; Michiko Nakamura

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 379 KB
• Volume: 27
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(82)80061-3

✦ Synopsis

The adsorption of poly-o~-alanine (mean molecular weight 3900) at the mercurysolution interface was studied by means of diflerential capacity and surface tension measurements. The poly-DLalanine adsorbed in the potential region between 0.0 and -1.6 V (see). At the potentials of -0.5 and -1 .l V the maximum surface concentration I-,, and the surface area -pied by one molecule, S, were derived from the diffusion-controlled adsorption behavior with the assumption of the diffusion cc&Went. The values of S at -1.1 V in 0.1 N sulfuric acid, 0.1 N sodium sulfate and 0.1 N sodium hydroxide were 348, 282 and 274~2/molecule, respectively, and the values at -0.5 V became somewhat larger than the above values. The above S values derived from the differential capacity measurement were supported from those derived from the surface tension measurement by means ot' the Lippmann adsorption equation. The adsorbed conformation at the mercury-solution interface was discussed from those S values.