|Effects of surface roughness and film thickness on the adhesion of a bioinspired nanofilm|
|Peng ZL(彭志龙); Chen SH(陈少华); Peng, ZL (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China
|Source Publication||Physical Review E
|Abstract||Inspired by the gecko's climbing ability, adhesion between an elastic nanofilm with finite length and a rough substrate with sinusoidal roughness is studied in the present paper, considering the effects of substrate roughness and film thickness. It demonstrates that the normal adhesion force of the nanofilm on a rough substrate depends significantly on the geometrical parameters of the substrate. When the film length is larger than the wavelength of the sinusoidal roughness of the substrate, the normal adhesion force decreases with increasing surface roughness, while the normal adhesion force initially decreases then increases if the wavelength of roughness is larger than the film length. This finding is qualitatively consistent with a previously interesting experimental observation in which the adhesion force of the gecko spatula is found to reduce significantly at an intermediate roughness. Furthermore, it is inferred that the gecko may achieve an optimal spatula thickness not only to follow rough surfaces, but also to saturate the adhesion force. The results in this paper may be helpful for understanding how geckos overcome the influence of natural surface roughness and possess such adhesion to support their weights.|
|WOS Keyword||EMBEDDED-ATOM POTENTIALS
; ELASTIC SOLIDS
; DISPERSION FORCES
; 130 NM
|WOS Research Area||Physics
|WOS Subject||Physics, Fluids & Plasmas
; Physics, Mathematical
|Funding Organization||The work reported here is supported by the NSFC through Grants No. 10972220, No. 10732050, and No. 11021262. In addition, the authors thank the two anonymous reviewers for their helpful and professional suggestions.
|Corresponding Author||Peng, ZL (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China|
Peng ZL,Chen SH,Peng, ZL . Effects of surface roughness and film thickness on the adhesion of a bioinspired nanofilm[J]. Physical Review E,2011,83(5):51915.
彭志龙,陈少华,&Peng, ZL .(2011).Effects of surface roughness and film thickness on the adhesion of a bioinspired nanofilm.Physical Review E,83(5),51915.
彭志龙,et al."Effects of surface roughness and film thickness on the adhesion of a bioinspired nanofilm".Physical Review E 83.5(2011):51915.
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