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Nano-pillars made of poly (methyl-methacrylate) (PMMA) were fabricated on silicon wafer by capillary force lithography technique. The pattern was investigated for its tribological properties at micro/nano-scales in comparison with flat polymeric surface. An atomic force microscope (AFM) was used to investigate adhesion and friction properties of the patterns and flat surface at nano-scale. Two AFM tips with diameter of 2.5 and 10㎛ were used to study the effect of the tip size. A reciprocating micro-tribotester using glass balls (1㎜ in diameter) as counter-body was used to study friction characteristic of the samples at micro-scale. Results indicated that the patterns exhibited significant lower nano-adhesion and micro/nano-friction when compared to those of the flat film. The reasons for the patterns to exhibit such low adhesion and friction were assigned to its reduced real contact area and increased hydrophobicity. Moreover, the adhesion and friction forces of the patterned and non-patterned surfaces increased with the AFM tip size. It was due to the increase in real contact area when the larger tip contacts with the sample surfaces.

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ABSTRACT
Introduction
Experimental details
Results and discussion
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UCI(KEPA) : I410-ECN-0101-2010-551-002326311