摘要Physisorption may cause a dimple on a deformable solid surface due to adsorbate--substrate interaction. The interactive force between the adsorbate and the crystal atoms depends on their distances, which may change with substrate deformation. This feature of displacement-dependence indicates that the equilibrium problem is a force-deformation coupled nonlinear procedure. In the present study, a continuum mechanics model, in which the force is considered as a function of the displacement field of the medium, is presented to calculate the physisorption-induced deformation in a semi-infinite elastic medium. It is found that the nonlinear effect due to force-deformation coupling should be taken in consideration in the adsorbate--substrate interaction analysis.
Abstract:Physisorption may cause a dimple on a deformable solid surface due to adsorbate--substrate interaction. The interactive force between the adsorbate and the crystal atoms depends on their distances, which may change with substrate deformation. This feature of displacement-dependence indicates that the equilibrium problem is a force-deformation coupled nonlinear procedure. In the present study, a continuum mechanics model, in which the force is considered as a function of the displacement field of the medium, is presented to calculate the physisorption-induced deformation in a semi-infinite elastic medium. It is found that the nonlinear effect due to force-deformation coupling should be taken in consideration in the adsorbate--substrate interaction analysis.
[1] Pedio M, Felici R, Torrelles X, Rudolf P, Capozi M, Rius J andFerrer S 2000 Phys. Rev. Lett. 85 1040 [2] Guo Y P, Tan K C, Wang H Q, Huan C H A and Wee A T S 2002 Phys. Rev. B 66 165410 [3] Schunack M, Petersen L, K\"uhnle A, Laegsgaard E, Stensgaard I,Johannsen I and Besenbacher F 2001 Phys. Rev. Lett. 86 456 [4] Casero E, V\'azquez L, Mart\'\i n-Benito J, Morcillo M A,Lorenzo E and Pariente F 2002 Langmuir 18 5909 [5] Huang S Q, Li Q Y, Feng X Q and Yu S W 2006 Mech. Mater. 38 88 [6] Zhang J Q, Yu S W, Feng X Q and Huang G Y 2006 Philos. Mag. Lett. 86 277 [7] Peralta A, Kouris D, Knap J and Sieradzki K 1998 J. Mech.Phys. Solids 46 1557 [8] Kukta R V, Kouris D and Sieradzki K 2003 J. Mech. Phys.Solids 51 1243 [9] Levi A C 1999 Surf. Sci. 426 308 [10] Levi A C and Pisoni C 2004 Surf. Sci. 566--568 683 [11] Calvini P and Levi A C 2005 Surf. Sci. 594 43 [12] Levi A C and Calvini P 2007 Surf. Sci. 601 1494 [13] Mindlin R D 1936 Physics---A Journal of Generaland Applied Physics 7 195