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Biomechanism of adhesion in gecko setae

Science China(Life Sciences) 2012年第2期55卷 181-187页

作者： GUO Ce SUN JiuRong GE YingBin WANG WenBo WANG DaPeng DAI-ZhenDong Institute of Bio-inspired Structure and Surface Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Life Science Peking UniversityBeijing 100873China School of Basic Medical Sciences Nanjing Medical UniversityNanjing 210029China Institute of Intelligent Machines Chinese Academy of SciencesHefei 230031China

The study of the adhesion of millions of setae on the toes of geckos has been advanced in recent years with the emergence of new technology and measurement methods. The theory of the mechanism of adhesion by van der Waals forces is now accepted and broadly understood. However, this paper presents limitations of this theory and gives a new hypothesis of the biomechanism of gecko adhesion. The findings are obtained through measurements of the magnitude of the adhesion of setae under three different conditions, to show the close relationship between adhesion and status of the setae. They are reinforced by demonstrating two setal structures, follicle cells and hair, the former making the setae capable of producing bioelectrical charges, which play an important role in attachment and detachment processes. It is shown that the abundant muscular tissues at the base of the setae cells, which are controlled by peripheral nerves, are instrumental in producing the foot movement involved in attachment and detachment. Our study will further uncover the adhesion mechanism of geckos, and provide new ideas for designing and fabricating synthetic setae.

关键词： gecko setae adhesion biomechanism microstructure bionics

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Morphology and contact mechanics influence adhesive characteristics of Dung Beetle's bristle and gecko's setae

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Progress in Natural Science:Materials International 2007年第9期17卷 1074-1081页

作者： Yue David China Institute of Bio-Inspired Structure and Surface Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016

geckos(Gekko gecko)use their hairy setae to adhere on various solid surfaces and dung beetles(Copris ochus Motschulsky)use their hairy bristles to anti-adhere in sticky *** study why two hairy systems express a conflict in functions by using SEM,histological approaches and functional *** models and various parameters were collected and *** on the morphological data and functional experimental results carried out by natural and denatured gecko setae and beetle bristles,we first demonstrated that the stiffness along the hair is 1000 to 30000 times that perpendicular to the *** stiffness difference is the key factor leading to the two hairy systems’ functional *** of gecko setae reduces contact stiffness,increases contact points and real contact area that results in amazing adhesive *** the other hand,stiff bristles in a beetle have higher contact stiffness,which reduces the real contact area and decreases the adhesion between two contact *** of gecko setae destroys the hierarchical structure,increases the contact stiffness and results in a decrease of adhesion ***,deformation of beetle bristles destroys the erect structure of the hair,interconnects the separated bristles and thus decreases the anti-adhesive *** observations inspire us in designing anti-adhesive and adhesive biomimetic systems

关键词： Adherence Morphology Contact stiffness Beetle bristles gecko setae Contact mechanics

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