期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 7, 页码 3397-3404出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1914813117
关键词
crystallization; biomineralization; calcium carbonate; magnesium; morphology
资金
- National Natural Science Foundation of China [21625105, 21805241, 11904300]
- Fujian Provincial Department of Science Technology [2017J05028]
- Fundamental Research Funds for the Central Universities [20720180018]
- China Postdoctoral Science Foundation [2017M621909, 2018T110585]
- Office of Biological and Environmental Research
- Department of Energy [DE-AC05-76RL01830]
Organisms use inorganic ions and macromolecules to regulate crystallization from amorphous precursors, endowing natural biominerals with complex morphologies and enhanced properties. The mechanisms by which modifiers enable these shape-preserving transformations are poorly understood. We used in situ liquid-phase transmission electron microscopy to follow the evolution from amorphous calcium carbonate to calcite in the presence of additives. A combination of contrast analysis and infrared spectroscopy shows that Mg ions, which are widely present in seawater and biological fluids, alter the transformation pathway in a concentration-dependent manner. The ions bring excess (structural) water into the amorphous bulk so that a direct transformation is triggered by dehydration in the absence of morphological changes. Molecular dynamics simulations suggest Mg-incorporated water induces structural fluctuations, allowing transformation without the need to nucleate a separate crystal. Thus, the obtained calcite retains the original morphology of the amorphous state, biomimetically achieving the morphological control of crystals seen in biominerals.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据