Author manuscript, published in "Journal of Physical Chemistry C 116 (2012) 15117-15125" DOI: 10.1021/jp303414c Nanostructured Non-adhesive Surfaces for Micro- and

Adhesion between microgripper end-effector and a nano/micro-object is a main topic for manipulation in micro- and nanoscale. Tuning this force is a great challenge. Adhesion force is directly linked to the chemical composition and the surface roughness of both, the object and the gripper. Recently, we proposed a multispheres van der Waals force model able to predict this force. The surface used was structured by an array of polystyrene spheres with radii from 35 nm to 2 μm. The experimental pull-off forces have confirmed our model. In this present work, we analyzed other innovating structure such as nonclosed packed polystyrene (PS) spheres and organized Si nanostructures, formed by chemical etching. The adhesion values of the pull-off force measured on these structures were very low (in the range of 2–10 nN) and suggest that these new structures have nonadhesive properties. A new model taking in account the roughness and the organization of the PS spheres and Si nanostructures has been developed to predi...

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