Oxygen adsorption behavior on the surface of liquid Cu-Ag alloys

Joonho Lee, Toshihiro Tanaka, Yuuichi Asano, Shigeta Hara

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The behavior of oxygen adsorption on the surface of liquid Cu-Ag alloys was investigated by measuring their surface tension (σ) with the sessile drop method in the oxygen partial pressures (pO2,) between 2.5 × 10-11 and 2.5 × 10-3 Pa. The oxygen adsorption (the surface excess concentration of oxygen) was calculated from the slope of dσ/d ln pO2 by applying Gibbs adsorption isotherm, for liquid Cu, Cu-5 at%Ag, Cu-10at%Ag, Cu-20at%Ag and Ag. It was found that the oxygen adsorption increased with the oxygen partial pressure, up to saturation on the surface. The oxygen adsorption on the surface of liquid Cu-20 at%Ag alloys exhibited almost the same behavior as that of pure liquid Ag, because surface saturation was not achieved for the Cu-20 at%Ag alloys, even at high oxygen partial pressures. Thermodynamic calculations using Butler's model indicated that the mole fraction of Ag in the surface of liquid Cu-Ag alloys drastically increases to 0.81 when the mole fraction of Ag in the bulk is only 0.2. Thus, it is considered that the outermost surface of liquid Cu-20 at% Ag alloys contains an enhanced level of Ag, which determines the oxygen adsorption behavior on liquid Cu-20 at%Ag alloys.

Original languageEnglish
Pages (from-to)2719-2722
Number of pages4
JournalMaterials Transactions
Volume45
Issue number8
Publication statusPublished - 2004 Aug 1
Externally publishedYes

Fingerprint

Oxygen
Adsorption
adsorption
Liquids
oxygen
liquids
Partial pressure
partial pressure
saturation
Adsorption isotherms
Surface tension
interfacial tension
isotherms
Thermodynamics
slopes
thermodynamics

Keywords

  • Adsorption
  • Metals and alloys
  • Oxygen
  • Sessile drop method
  • Surface tension
  • Surfaces

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

Lee, J., Tanaka, T., Asano, Y., & Hara, S. (2004). Oxygen adsorption behavior on the surface of liquid Cu-Ag alloys. Materials Transactions, 45(8), 2719-2722.

Oxygen adsorption behavior on the surface of liquid Cu-Ag alloys. / Lee, Joonho; Tanaka, Toshihiro; Asano, Yuuichi; Hara, Shigeta.

In: Materials Transactions, Vol. 45, No. 8, 01.08.2004, p. 2719-2722.

Research output: Contribution to journalArticle

Lee, J, Tanaka, T, Asano, Y & Hara, S 2004, 'Oxygen adsorption behavior on the surface of liquid Cu-Ag alloys', Materials Transactions, vol. 45, no. 8, pp. 2719-2722.
Lee, Joonho ; Tanaka, Toshihiro ; Asano, Yuuichi ; Hara, Shigeta. / Oxygen adsorption behavior on the surface of liquid Cu-Ag alloys. In: Materials Transactions. 2004 ; Vol. 45, No. 8. pp. 2719-2722.
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