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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Transformation Mechanism Of Amorphous Calcium Carbonate Into Calcite In The Sea Urchin Larval Spicule
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Transformation Mechanism Of Amorphous Calcium Carbonate Into Calcite In The Sea Urchin Larval Spicule

机译:海胆幼虫无定形碳酸钙向方解石的转化机理

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Sea urchin larval spicules transform amorphous calcium carbonate (ACC) into calcite single crystals. The mechanism of transformation is enigmatic: the transforming spicule displays both amorphous and crystalline properties, with no defined crystallization front. Here, we use X-ray photoelectron emission spectromicroscopy with probing size of 40-200 nm. We resolve 3 distinct mineral phases: An initial short-lived, presumably hydrated ACC phase, followed by an intermediate transient form of ACC, and finally the biogenic crystalline calcite phase. The amorphous and crystalline phases are juxtaposed, often appearing in adjacent sites at a scale of tens of nanometers. We propose that the amorphous-crystal transformation propagates in a tortuous path through preexisting 40- to 100-nm amorphous units, via a secondary nucleation mechanism.
机译:海胆幼虫针状晶体将无定形碳酸钙(ACC)转变为方解石单晶。转化的机理是神秘的:转化的尖晶石既具有非晶态又具有结晶性,没有明确的结晶前沿。在这里,我们使用X射线光电子发射光谱显微镜,探测尺寸为40-200 nm。我们解析了3个不同的矿物相:一个初始的短暂的,大概是水合的ACC相,然后是一个中间瞬态形式的ACC,最后是生物成因的方解石相。非晶相和结晶相并列,通常以数十纳米的大小出现在相邻的位置。我们提出,通过二次成核机制,非晶态晶体的转变通过预先存在的40至100 nm非晶态单元以曲折的路径传播。

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