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The Lowest Surface Free Energy Based on −CF<sub>3</sub> Alignment

Langmuir · 1999 · Vol. 15(13) · pp. 4321–4323

Takashi Nishino✉(Kobe University)Masashi Meguro(Kobe University)Katsuhiko Nakamae(Kobe University)Motonori Matsushita(Kobe University)Yasukiyo Ueda(Kobe University)

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Abstract

Free energy was measured for the surface of regular aligned closest hexagonal packed −CF3 groups. n-Perfluoroeicosane was vapor deposited onto glass, which gave epitaxially grown single-like crystallites with their molecular axes perpendicular to the glass surface. The dynamic contact angle of water on its surface was 119°, which corresponds to a surface free energy of 6.7 mJ/m2. This value is considered to be the lowest surface free energy of any solid, based on the hexagonal closed alignment of −CF3 groups on the surface.

Surface Modification and Superhydrophobicity nanoparticles nucleation surface interactions Adhesion, Friction, and Surface InteractionsCrystalliteSurface energyPerpendicularSpecific surface energySurface (topology)Free surfaceEpitaxyHexagonal crystal systemContact angleCrystallography

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