By Zhilong Peng
The thesis systematically investigates the criteria which impression many animals’ powerful adhesion talents and micro-reversible adhesion mechanisms, together with the geometric rules in their adhesion, relative humidity, floor roughness and pre-tension. reviews exploring organic adhesion mechanisms aren't in basic terms of significant value for the layout of complex adhesive fabrics and adhesion structures for micro-climbing robots, but in addition very precious for resolving the matter of adhesion failure in MEMS/NEMS.
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Additional info for Bio-inspired Studies on Adhesion of a Thin Film on a Rigid Substrate
Generally speaking, the present theoretical model is approximately valid to predict the order of magnitude of the effective adhesion length, beyond which the nanoﬁlm will be peeled off from the rigid substrate. 2 Comparison with Kendall’s Model Kendall’s peeling model  is popular in studying the mechanical behavior of ﬁlm-substrate interface, in which it is assumed that the adhesion length of ﬁlm is inﬁnite. According to Kendall’s model, the peeling force can be expressed as a function of the peeling angle 2Dc p ¼ qﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ ð1 À cos hÞ2 þ 2Dc Et þ ð1 À cos hÞ ð3:16Þ Fig.
Int J Solids Struct 45(20):5419–5436 41. Persson BNJ (2003) On the mechanism of adhesion in biological systems. J Chem Phys 118 (16):7614–7621 42. 5– 130 nm. Proc R Soc Lond A-Math Phys Eng Sci 331(1584):19–38 43. Chen SH, Xu G, Soh A (2010) Size-dependent adhesion strength of a single viscoelastic ﬁber. Tribol Lett 37(2):375–379 44. Russell AP (1975) A contribution to the functional analysis of the foot of the Tokay, Gekko gecko (Reptilia: Gekkonidae). J Zool 176(4):437–476 45. Kendall K (1975) Thin-ﬁlm peeling—elastic term.
Specially, a relatively real hierarchical model was proposed by Chen et al. , in which the intermediate level of the structure consists of setae while the lowest level was modeled as spatulae. However, the above hierarchical models could not account for an important experimental observation that a critical detachment angle independent on the peeling force existed for gecko’s hierarchical setae and even for the entire toe . Above the critical angle, no apparent adhesion force could be detected for the hierarchical structure.