![]() ![]() Friction curves for d) hydrophobic and e) hydrophilic microstructured surfaces under dry and wet conditions. ![]() c) Friction curves for glass and for fl at and microstructured PDMS under dry conditions. The gray arrow indicates the transition between the static and the dynamic friction. The half-distance between dynamic friction plateaus (Δ V /2) corresponds to the dynamic sliding friction force. b) Lateral force sensor signal versus piezo position as obtained in friction experiments on a hydrophobic surface patterned with regular hexagons. Motion control and signal acquisition are done by a computer with an AD/DA board running a self-written LabView program. During measurements, vertical (2) and lateral (3) piezo translation stages are used to move the sample and friction forces are recorded by the lateral thin fi lm force sensor (4). A motorized xyz-stage (1) allows coarse positioning. The sample (6) sits on top of a sample holder (5) with glass bottom and integrated mirror to allow bottom view via a mirror using the video microscope (9). A ruby sphere with 4 mm diameter (7) mounted at the end of a vertical thin fi lm load sensor (8) acts as a force probe. ![]()
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