Physical Adsorption of Kr Gas on Graphite Surface : 2D Equation of State

흑연 표면에서의 Kr 기체의 물리흡착

  • Woon Sun Ahn (Department of Chemistry, Sung Kyun Kwan University) ;
  • Yong Keun Son (Department of Chemistry, Sung Kyun Kwan University) ;
  • Eun Ah Yoo (Department of Chemistry, Sung Kyun Kwan University) ;
  • Kwang Soon Lee (Department of Chemistry, Sung Kyun Kwan University)
  • 안운선 (성균관대학교 이공대학 화학과) ;
  • 손용근 (성균관대학교 이과대학 화학과) ;
  • 류은아 (성균관대학교 이과대학 화학과) ;
  • 이광순 (성균관대학교 이과대학 화학과)
  • Published : 1981.08.30

Abstract

Assuming krypton molecules adsorbed on graphite surface as 2D gas, the interaction energy of Kr-graphite and the Henry's constant are calculated analytically by the Fourier series expansion method. 2D virial cofficients, $B_{2D}$ and $C_{2D}$, are also calculated to obtain 2D equation of state, and hence adsorption isotherms. The isotherms so obtained are compared with experimental results reported by Putnam and Fort. The pairwise additivity of Lennard-Jones(12, 6) interaction energy is also assumed, and parameters therein are taken as; ${\varepsilon}_{gs}$/k = 70 K, ${\sigma}_{gs}$ = 0.35 nm, ${\varepsilon}_{gg}$/k = 170 K, and ${\sigma}_{gg}$ = 0.37 nm.

흑연 표면(0001)에 흡착한 Kr 분자를 2D 기체로 보고 Kr-흑연의 상호작용 에너지와 Henry 상수 $K_H$를 Fourier series expansion에 의해서 해석함수로 구하였다. 그리고 2D virial계수 $B_{2D}$$C_{2D}$를 계산하여 2D 상태방정식을 얻었으며, 이것으로 부터 구한 흡착등온곡선을 실험 결과와 비교하였다. 상호작용 에너지는 Lennard-Jones (12, 6) 퍼텐셜의 pairwise additivity로 가정하였으며, 사용한 파라미터는 ${\varepsilon}_{gs}$/k = 70 K, ${\sigma}_{gs}$ = 0.35 nm, ${\varepsilon}_{gg}$/k = 170 K 및 ${\sigma}_{gg}$ = 0.37 nm이다.

Keywords

References

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