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    Shape of Water−Air Interface beneath a Drop on a Superhydrophobic Surface Revealed: Constant Curvature That Approaches Zero

    Year: 2013

    Journal: Journal of Physical Chemistry C, 117, pp 6658-6663, 20130926

    Authors: Boris Haimov, Sasha Pechook, Orna Ternyak, Boaz Pokroy

    Organizations: Department of Materials Science & Engineering, Technion Israel Institute of Technology, Haifa 32000, Israel, Russell Berrie Nanotechnology Institute, Technion Israel Institute of Technology, Haifa 32000, Israel, Micro- and Nano- Fabrication Unit (MNFU) Department of Electrical Engineering, Technion Israel Institute of Technology, Haifa 32000, Israel

    The 3D interface between a sessile water drop that is foundon a superhydrophobic microtextured surface has been directly imagedusing a confocal microscope with an immersion lens. The local meancurvature of the water−air interface was derived and was shown to beconstant and close to zero not only for the case of pure water, but also forcases of variable drop density and surface tension. Although the meancurvature is constant and close to zero, the standard deviation on the meancurvature increases with increasing drop density and lower surface tension.The resulting 3D image of the water−air interface at the bottom of a waterdrop demonstrates the possibility of investigating practical interfaces ofwater on given textures and confirms that no matter what the superhydrophobic surface characteristics are, the interface remainswith a constant curvature of close to zero.