For the nacre with mesolayer structure, the nanoindentation elastic modulus was 43 ( 2.74) GPa for wild abalone and 36 ( 6.04) GPa for farm raised abalone. Those values are a little lower than the value of nacre without mesolayer. However, the lowering of apparent elastic modulus can also be attributed to existence of compliant structure underneath. Thus, the mechanism of how this composite structure, i.e. mesolayer, influence the fracture property of nacre is still under investigation. Fig. 20.6 Some interruption layer were covering nacre tablets Fig. 20.5 Comparison of interruption obtained in the lab and mesolayer in wild abalone shell. (a) 60 F, 10th week, Tank 6, Experiment 4, Backscattered electron image; (b) Mesolayer in wild abalone shell, Backscattered electron image 146 A. Zhang et al.
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