Journal
BIOFOULING
Volume 20, Issue 6, Pages 279-289Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08927010400026383
Keywords
barnacle adhesive; Young's modulus; Atomic force microscopy; Griffith's theory
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The properties of barnacle adhesive on silicone surfaces were studied by AFM indentation, imaging, and other tests and compared to the barnacle shear adhesion strength. A multilayered structure of barnacle adhesive plaque is proposed based on layered modulus regions measured by AFM indentation. The fracture of barnacles from PDMS surfaces was found to include both interfacial and cohesive failure of barnacle adhesive plaque, as determined by protein staining of the substratum after forced barnacle release from the substrate. Data for freshly released barnacles showed that there was a strong correlation between the mean Young's modulus of the outermost (softest) adhesive layer (E < 0.3 MPa) and the shear strength of adhesion, but no correlation for other higher modulus regions. Linear, quadratic, and Griffith's failure criterion ( based on rough estimate of crack length) regressions were used in the fit, and showed significance.
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