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RISS 인기검색어
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- 저자 : Euu-Sung Yoon (검색결과 1 건)
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Effect of tip size on adhesion and friction characteristics of patterned polymeric surface
Duc-Cuong Pham,R. Arvind Singh,Nguyen Xuan Toan,Euu-Sung Yoon 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
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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