Ulrike Mock et al 2005 J. Phys.: Condens. Matter 17 S595 doi:10.1088/0953-8984/17/9/018
Ulrike Mock1, Tobias Michel2, Cameron Tropea2, Ilia Roisman3 and Jürgen Rühe1
Show affiliationsWe describe recent investigations on the impact behaviour of liquid drops onto chemically structured surfaces. The surface patterns were prepared via photochemical attachment of polymer molecules with different hydrophilicities using self-assembled monolayers of benzophenone bearing silanes. Immobilization of the polymer monolayers was followed by an ablation process to generate a chemical surface pattern. Impact experiments on systems consisting of very hydrophobic poly(perfluoroalkylethyl)acrylate coatings and hydrophilic areas show that within certain limitations the water drop has a strong tendency to reach the hydrophilic spots, even for inclined substrates. Impact experiments of drops on arrays of hydrophilic spots on the background of a perfluorinated polymer show that the drops spontaneously self-centre on the lithographically generated pattern. The obtained results suggest that the process can be used to circumvent some of the current problems in micro-array fabrication.
47.55.dr Interactions with surfaces
68.47.Pe Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces
Issue 9 (9 March 2005)
Received 24 November 2004
Published 18 February 2005
Ulrike Mock et al 2005 J. Phys.: Condens. Matter 17 S595
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