title: Slip length measurement of confined air flow on three smooth surfaces.
abstract: An experimental measurement of the slip length of air flow close to three different solid surfaces is presented. The substrate was driven by a nanopositioner moving toward an oscillating glass sphere glued to an atomic force microscopy (AFM) cantilever. A large separation distance was used to get more effective data. The slip length value was obtained by analyzing the amplitude and phase data of the cantilever. The measurements show that the slip length does not depend on the oscillation amplitude of the cantilever. Because of the small difference among the slip lengths of the three surfaces, a simplified analysis method was used. The results show that on glass, graphite, and mica surfaces the slip lengths are 98, 234, and 110 nm, respectively.
authors: Nanoprobe Laboratory for Bio- and Nanotechnology & Biomimetics (NLB2), The Ohio State University, Columbus, Ohio 43210-1142, United States.
authors: Yunlu
authors: Y
authors: Pan
authors: Bharat
authors: B
authors: Bhushan
authors: Abdelhamid
authors: A
authors: Maali
mesh_terms: D000388:Air; D000538:Aluminum Silicates / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D013499:Surface Properties
chemical_list: D000538:Aluminum Silicates; D006108:Graphite; C011934:mica