Microscopic Spreading of Nonreactive Perfluoropolyalkylether Film on Amorphous Carbon Surfaces

Min Chan Kim; Myung S. Jhon

Korean Journal of Chemical Engineering, Vol.17, No.4, 444-448, July, 2000

DOI10.1007/BF02706858 Export Citation

Microscopic Spreading of Nonreactive Perfluoropolyalkylether Film on Amorphous Carbon Surfaces

Min Chan Kim^†, and Myung S. Jhon¹

Department of Chemical Engineering, Cheju National University, Cheju 690-756, Korea
¹Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pa 15213, USA

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A spreading mechanism of nonfunctional perfluoroopolyalkylether (PFPE) on carbon surfaces is proposed. For the thin thin-film regine, adsorption-desorption is a main driving force for spreading, and the surface diffusion coefficients increase as the film thickness increases. A two-dimensional virial equation is employed to explain the dependency of surface diffusion coefficient on the film thickness. For the thick thin-film regime, the spreading characteristic is determined by the disjoining pressure gradient. We adopt a slip boundary condition to analyze the thick thin-film regime. This modification of the boundary condition reasonably explains the dependence of surface diffusion coefficients of film thickness.

Keywords:Microscopic Spreading;Surface Diffusion;PFPE;Partial Slip Effect

[References]

Adamson AW, "Physical Chemistry of Surfaces," 5th ed., Wiley (1990)
Bird RB, "Transport Phenomena," Wiley (1960)
Bruinsma R, Macromolecules, 23, 276 (1990)
Cazabat AM, Fraysse F, Heslot F, Carles P, J. Phys. Chem., 94, 7581 (1990)
Ferry JD, "Viscoelastic Properties of Polymers," Wiley, N.Y. (1970)
Fraysse F, Valignant MP, Cazabat AM, Heslot F, Livingson P, J. Colloid Interface Sci., 158, 27 (1993)
Heslot F, Fraysse N, Cazabat AM, Nature, 338, 640 (1989)
Ma X, "Spreading of Perfluoropolyalkylther Films on Amorphous Carbon Surfaces," Ph.D. Thesis, Carnegie Mellon University, PA (1998)
Marchionni G, Cinquina AG, Tampelini E, Pezzin G, Polym. Eng. Sci., 30, 829 (1990)
Matano C, Jap. J. Phys., 8, 109 (1933)
Mate M, J. Appl. Phys., 72, 3084 (1992)
Min BG, Choi JW, Brown HR, Yoon DY, O'Cornor TM, Jhon MS, Tribol. Lett., 1, 22 (1995)
Novotny VJ, J. Chem. Phys., 92, 3189 (1990)
Novotny VJ, Hussla I, Turlet JM, Philport MR, J. Chem. Phys., 90, 5861 (1989)
O'Cornor TM, "Spreading of Ultra-Thin Perfluoropolyalkylether Films," Ph.D. Thesis, Carnegie Mellon University, PA (1995)
Tabor D, Winterton RHS, Nature, 219, 1120 (1968)
Teletzke GF, Davis HT, Scriven LE, Chem. Eng. Commun., 55, 41 (1987)
Valignant MP, Fraysee N, Cazabat AM, Heslot F, Langmuir, 9, 601 (1993)

[Referenced By]

[Related Articles]

[1] Adamson AW, "Physical Chemistry of Surfaces," 5th ed., Wiley (1990)

[2] Bird RB, "Transport Phenomena," Wiley (1960)

[3] Bruinsma R, Macromolecules, 23, 276 (1990)

[4] Cazabat AM, Fraysse F, Heslot F, Carles P, J. Phys. Chem., 94, 7581 (1990)

[5] Ferry JD, "Viscoelastic Properties of Polymers," Wiley, N.Y. (1970)

[6] Fraysse F, Valignant MP, Cazabat AM, Heslot F, Livingson P, J. Colloid Interface Sci., 158, 27 (1993)

[7] Heslot F, Fraysse N, Cazabat AM, Nature, 338, 640 (1989)

[8] Ma X, "Spreading of Perfluoropolyalkylther Films on Amorphous Carbon Surfaces," Ph.D. Thesis, Carnegie Mellon University, PA (1998)

[9] Marchionni G, Cinquina AG, Tampelini E, Pezzin G, Polym. Eng. Sci., 30, 829 (1990)

[10] Matano C, Jap. J. Phys., 8, 109 (1933)

[11] Mate M, J. Appl. Phys., 72, 3084 (1992)

[12] Min BG, Choi JW, Brown HR, Yoon DY, O'Cornor TM, Jhon MS, Tribol. Lett., 1, 22 (1995)

[13] Novotny VJ, J. Chem. Phys., 92, 3189 (1990)

[14] Novotny VJ, Hussla I, Turlet JM, Philport MR, J. Chem. Phys., 90, 5861 (1989)

[15] O'Cornor TM, "Spreading of Ultra-Thin Perfluoropolyalkylether Films," Ph.D. Thesis, Carnegie Mellon University, PA (1995)

[16] Tabor D, Winterton RHS, Nature, 219, 1120 (1968)

[17] Teletzke GF, Davis HT, Scriven LE, Chem. Eng. Commun., 55, 41 (1987)

[18] Valignant MP, Fraysee N, Cazabat AM, Heslot F, Langmuir, 9, 601 (1993)