20.4 Conclusion For the growth mechanism of mesolayer, many environment factors may lead to its growth. And, by now, the details are unknown. However, it is possible that its structure could be mimicked through Flat Pearl method. And by observing the grown nacre in lab, the details about nacre and mesolayer growth process might be learned. For the mechanical properties effected by mesolayer, although a lower elastic modulus tested by Nano-indenter is shown in the nacre structure with mesolayer in it than in the nacre structure without mesolayer, it is still not sure that it caused by the mesolayer. The mechanical behavior of mesolayer in nacre is still under investigation. 0 20 40 60 80 100 120 0 1000 2000 Modulus (Gpa) Modulus (Gpa) Displacement(nm) Modulus (Gpa) vs. Displacement (nm) Wet Farm Raised Abalone Nacre (a) 0 20 40 60 80 100 120 0 1000 2000 Displacement (nm) Modulus (Gpa) vs. Displacement (nm) Nacre obtained through Flat Pearl in Lab (b) 0 20 40 60 80 100 120 0 1000 2000 Modulus (Gpa) Displacement(nm) Modulus (Gpa) vs. Displacement (nm) Wet Wild Abalone Nacre (c) Fig. 20.7 Modulus vs. displacement tested by nanoindentation for nacre without mesolayer. (a) Modulus of farm raised abalone nacre (combined by data of five samples); (b) modulus of lab raised (by Flat Pearl, 60 F, 10th week, Experiment 4, Tank 10) abalone nacre; (c) modulus of wild abalone nacre (combined by data of three samples) 20 The Growth and Mechanical Properties of Abalone Nacre Mesolayer 147
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