Stable prenucleation mineral clusters are liquid-like ionic polymers.
Stable prenucleation mineral clusters are liquid-like ionic polymers.
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DOI：
10.1038/ncomms1604
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发表时间：
2011-12-20
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
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作者：
碳酸钙是一种丰富的物质，可以通过水中溶解的二氧化碳与钙离子的反应产生多种矿物质形式。通过生物矿化，生物体可以利用和控制这一过程来形成各种功能材料，这些材料可以充当从贝壳到镜片的任何东西。碳酸钙形成的早期阶段最近引起了人们的关注，因为观察到了与经典模型相反的稳定的成核前簇。在这里，我们通过计算机模拟结合实验数据分析表明，这些矿物簇由离子聚合物组成，由交替的钙离子和碳酸根离子组成，具有由链、支链和环组成的动态拓扑。除了无定形碳酸钙生长过程中的非经典行为之外，无序、柔性和强水合前体的存在为解释碳酸钙的其他液态无定形态的形成提供了基础。与经典模型相反，在碳酸钙形成的早期阶段就观察到了成核前簇。在这里，计算机模拟表明，簇由具有交替的钙离子和碳酸根离子的离子聚合物以及链、支链和环的动态拓扑组成。
Calcium carbonate is an abundant substance that can be created in several mineral forms by the reaction of dissolved carbon dioxide in water with calcium ions. Through biomineralization, organisms can harness and control this process to form various functional materials that can act as anything from shells through to lenses. The early stages of calcium carbonate formation have recently attracted attention as stable prenucleation clusters have been observed, contrary to classical models. Here we show, using computer simulations combined with the analysis of experimental data, that these mineral clusters are made of an ionic polymer, composed of alternating calcium and carbonate ions, with a dynamic topology consisting of chains, branches and rings. The existence of a disordered, flexible and strongly hydrated precursor provides a basis for explaining the formation of other liquid-like amorphous states of calcium carbonate, in addition to the non-classical behaviour during growth of amorphous calcium carbonate. Prenucleation clusters have been observed during the early stages of calcium carbonate formation, contrary to classical models. Here, computer simulations indicate that the clusters are composed of an ionic polymer with alternating calcium and carbonate ions, and a dynamic topology of chains, branches and rings.
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影响因子：
--
作者：
Chen, T;Neville, A;Yuan, MD
通讯作者：
Yuan, MD
DOI：
10.1098/rspb.1997.0066
发表时间：
1997-03-22
影响因子：
4.7
作者：
Beniash, E;Aizenberg, J;Weiner, S
通讯作者：
Weiner, S
影响因子：
--
作者：
Gale, JD
通讯作者：
Gale, JD
影响因子：
4.1
作者：
PLIMPTON, S
通讯作者：
PLIMPTON, S
影响因子：
16.6
作者：
Gebauer, Denis;Gunawidjaja, Philips N.;Hedin, Niklas
通讯作者：
Hedin, Niklas