Origin of Nacre’s Iridescence in Abalone Shell
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摘要: 贝壳珍珠层的彩虹色来源于可见光与珍珠层微结构的相互作用。本文采用扫描电子显微镜（SEM）观察杂色鲍鲍壳珍珠层的微结构，利用微型光纤光谱仪测定其鲍壳珍珠层的反射光谱。结果表明：（1）不同区域珍珠层文石板片厚度不同，边缘生长端板片的厚度为499±35nm，成熟区板片的厚度为371±36nm，厚度变化致使珍珠层的彩虹色发生了明显改变；（2）贝壳边缘珍珠层的结构色是蓝色和黄色的混合色，贝壳中心珍珠层的结构色是红色和蓝色的混合色。此外，首次测出鲍壳珍珠层的多级反射谱，并定量的描述珍珠层的彩虹色。Abstract: Nacre’s iridescence results from the interaction of visible light and the nacre’s microstructure.In this study，using the scanning electron microscope（SEM）to observe the nacre’s structure in the abalone shells and a portable fiber optic spectrometer to measure the corresponding reflectance spectrum of nacre，the results show that the thickness of aragonite platelets varies from different regions of nacre，499±35nm at the shell edge and 371±36nm at the shell center，which causes obvious variation of nacre’s iridescence.What’s more，the structural colour of nacre at the shell edge is the secondary colour of blue and yellow，whereas the one at the shell center is the secondary colour of blue and red.Additionally，the authors measured the multiple reflectance spectra for the first time and applied a quantitative model to analyze the nacre’s iridescence in abalone shells.
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Keywords:
- abalone shell /
- nacre /
- microstructure /
- aragonite platelet /
- iridescence
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