Abstract：
:Nacre has long served as a model for understanding the biomineralization mechanism and designing bio-inspired materials. However, its basic building blocks, the aragonite tablets, are still under debate in terms of their fine structure at the nanoscale and corresponding formation mechanism. Here, using a field emission scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), and X-ray diffractometer, we comparatively investigate the immature and mature tablet from the green mussel's nacre. We find that: (1) the early immature tablet consists of closely-packed colloidal nanoparticles, which contain nanocrystals surrounded by the amorphous calcium carbonate (ACC) phase. Moreover, these nanocrystals are generally different in shape, size, and orientation; (2) the immature tablet can grow via oriented attachment besides via transformation of the ACC phase; and (3) with growth, the colloidal nanoparticles gradually increase in crystallinity and size until fully crystallized and fused together, leading to a mature tablet that is a monolithic single crystal of aragonite. Based on these findings, we propose a new model showing how the mature tablet evolves from the primary colloidal ACC nanoparticles. We expect this work will provide new insights into the formation of single crystal biominerals via the amorphous precursor route.
journal_name
J Struct Bioljournal_title
Journal of structural biologyauthors
Zhang G,Xu Jdoi
10.1016/j.jsb.2013.01.010subject
Has Abstractpub_date
2013-04-01 00:00:00pages
36-43issue
1eissn
1047-8477issn
1095-8657pii
S1047-8477(13)00024-5journal_volume
182pub_type
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pub_type： 杂志文章
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doi：10.1016/j.jsb.2004.03.002
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journal_title：Journal of structural biology
pub_type： 杂志文章
doi：10.1016/j.jsb.2014.03.012
更新日期：2014-05-01 00:00:00
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journal_title：Journal of structural biology
pub_type： 杂志文章
doi：10.1016/j.jsb.2016.01.013
更新日期：2016-04-01 00:00:00
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doi：10.1016/1047-8477(91)90018-r
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journal_title：Journal of structural biology
pub_type： 杂志文章
doi：10.1016/j.jsb.2016.01.012
更新日期：2016-04-01 00:00:00
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journal_title：Journal of structural biology
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journal_title：Journal of structural biology
pub_type： 杂志文章
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journal_title：Journal of structural biology
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更新日期：2010-05-01 00:00:00
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journal_title：Journal of structural biology
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更新日期：2015-05-01 00:00:00
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