MNM-5A-5 分子動力学法を用いた固体基板上の極薄液膜の自発的挙動の数値解析(セッション 5A ナノ・マイクロ異相界面センシングと制御)

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We discuss the behavior of instability leads to spinodal dewetting with classical molecular dynamics simulation. The liquid film is Ar with 12-6 Lennard-Jones potential and the solid molecules are Pt with harmonic potential. We analyzed the wavelength which leads to instability. That characteristic wavelength given by 2DFFT is proportional to the square of the initial thickness. It agrees well with the theoretical prediction. After dewetting, droplets formed by the collapse of the film. Previous study has indicated by experiments that the averaged diameter are proportional to the 1.5th power of the film initial thickness. Our results agree with this conclusion, too. In addition, we also studied the effect of atomic grooves on substrate. Behavior of dewetting is different from flat substrate since the molecules near substrate are influenced by the structure.
2010-10-12