摘要Nano-fibrillar arrays are fabricated using polystyrene materials. The average diameter of each fiber is about 300nm. Experiments show that such a fibrillar surface possesses a relatively hydrophobic feature with a water contact angle of 142°. Nanoscale friction properties are mainly focused on. It is found that the friction force of polystyrene nano-fibrillar surfaces is obviously enhanced in contrast to polystyrene smooth surfaces. The apparent coefficient of friction increases with the applied load, but is independent of the scanning speed. An interesting observation is that the friction force increases almost linearly with the real contact area, which abides by the fundamental Bowden-Tabor law of nano-scale friction.
Abstract：Nano-fibrillar arrays are fabricated using polystyrene materials. The average diameter of each fiber is about 300nm. Experiments show that such a fibrillar surface possesses a relatively hydrophobic feature with a water contact angle of 142°. Nanoscale friction properties are mainly focused on. It is found that the friction force of polystyrene nano-fibrillar surfaces is obviously enhanced in contrast to polystyrene smooth surfaces. The apparent coefficient of friction increases with the applied load, but is independent of the scanning speed. An interesting observation is that the friction force increases almost linearly with the real contact area, which abides by the fundamental Bowden-Tabor law of nano-scale friction.
[1] Autumn K, Liang Y A, Hsieh S T, Zesch W, Chan W P, Kenny TW, Fearing R and Full R J 2000 Nature 405 681 [2] Huber G, Gorb S N, Spolenak R and Arzt E 2005 Biol.Lett. 1 2 [3] Autumn K, Sitti M, Liang Y A, Peattie A M, Hansen W R,Sponberg S, Kenny T W, Fearing R, Israelachvili J N and Full R J2002 Proc. Natl. Acad. Sci. U.S.A. 99 12252 [4] Arzt E., Gorb S and Spolenak R 2003 Proc. Natl. Acad.Sci. U.S.A. 100 10603 [5] Chen S H and Gao H J 2007 J. Mech. Phys. Solids 55 1001 [6] Chen S H and Soh A K 2008 J. R. Soc. Interface 5 373 [7] Glassmaker N J, Jagota A, Hui CY and Kim J 2004 J. R.Soc. Interface 1 23 [8] Majidi C, Groff R E, Maeno Y, Schubert B, Baek S, Bush B,Maboudian R, Gravish N, Wilinson M, Autumn K and Fearing R S 2006 Phys. Rev. Lett. 97 076103 [9] Kim S, Aksak B and Sitti M 2007 Appl. Phys. Lett. 91 221913 [10] Aksak B, Sitti M, Cassell A, Li J, Meyyappan M and CallenP 2007 Appl. Phys. Lett. 91 061906 [11] Yao H and Gao H 2006 J. Mech. Phys. Solids 541120 [12] Wang P, Yang H J, Wang H B, Li H, Wang X Y, Wang Y, Lu JH, Li B, Zhang Y and Hu J 2008 Chin. Phys. Lett. 25 2407 [13] Johnson K L, Kendall K and Roberts A D 1971 Proc. R.Soc. London A 324 301 [14] Yoon E S, Singh R A, Oh H J and Kong H 2005 Wear 259 1424
2009, Vol. 26 
