title: Effect of fiber geometry on macroscale friction of ordered low-density polyethylene nanofiber arrays.
abstract: Ordered low-density polyethylene (LDPE) nanofiber arrays are fabricated from silicon nanowire (SiNW) templates synthesized by a simple wet-chemical process based on metal-assisted electroless etching combined with colloidal lithography. The geometrical effect of nanofibrillar structures on their macroscale friction is investigated over a wide range of diameters and lengths under the same fiber density. The optimum geometry for contacting a smooth glass surface is presented with discussions on the compromise between fiber tip-contact area and fiber compliance. A friction design map is developed, which shows that the theoretical optimum design condition agrees well with the LDPE nanofiber geometries exhibiting high measured friction.
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, USA.
authors.forename: Dae Ho
authors.initials: DH
authors.lastname: Lee
authors.forename: Yongkwan
authors.initials: Y
authors.lastname: Kim
authors.forename: Ronald S
authors.initials: RS
authors.lastname: Fearing
authors.forename: Roya
authors.initials: R
authors.lastname: Maboudian
mesh_terms: D057139:Nanofibers / Q000737:chemistry*; D036103:Nanotechnology; D053770:Nanowires / Q000737:chemistry; D010316:Particle Size; D020959:Polyethylene / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry; D013499:Surface Properties
chemical_list: D020959:Polyethylene; D012825:Silicon