First- and second-order phase transitions in the adlayer of biadipate on Au(111)

Literature Information

Publication Date 2008-11-26
DOI 10.1039/B813883D
Impact Factor 3.676
Authors

R.J. Nichols


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Abstract

The adsorption of biadipate on Au(111) was studied by cyclic voltammetry and chronocoulometry. The biadipate adlayer undergoes a potential-driven phase transition. It is shown that the phase transition can be either of the first- or second-order depending on the biadipate concentration. At low surfactant concentrations, the first-order transition is characterised by a discontinuity in the charge density–potential curve and by the presence of very sharp peaks in the voltammetric response. At higher concentrations, these peaks are no longer observed but a discontinuity in the capacity curve is still noticeable, in agreement with a second-order transition.

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