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首页> 外文期刊>Crystal growth & design >Solution-air interface synthesis and growth mechanism of tooth enamel-like hydroxyapatite/chondroitin sulfate films
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Solution-air interface synthesis and growth mechanism of tooth enamel-like hydroxyapatite/chondroitin sulfate films

机译：牙釉质状羟基磷灰石/硫酸软骨素膜的固溶-空气界面合成及生长机理

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摘要

Hierarchically self-assembled hydroxyapatite (HAP) and organic composite resembling tooth enamel has potential biological and surgery applications. Controlled fabrication remains a great challenge. In this work, large-scale translucent hydroxyapatite (HAP) and chondroitin sulfate (ChS) composite films are fabricated by a unique solution-air interface method. The products excellently represent the characteristic hierarchical "prism" structure of tooth enamel. We demonstrate that the films are formed by evaporation-induced nucleation at the interface and subsequent self-confined spherulitic growth. The supersaturation at the interface increases upon solution evaporation, and the local high supersaturation triggers preferred nucleation there. The spherulitic growth is regulated by ChS and limited by the interfaces between the spherulites as well as the solution and air. Consequently, HAP/ChS films with the hierarchically self-assembled prism structure are produced. We emphasize that the mechanism can excellently explain the unique prism structure formation in tooth enamel and in self-assembled nanorod arrays. The findings provide insight into the fundamentals of hierarchical assembly in nature (e.g., assembly of tooth enamel). Moreover, the approach could be expanded to design and grow other sophisticated functional structures.
机译：分层自组装羟基磷灰石（HAP）和类似牙齿珐琅质的有机复合材料具有潜在的生物学和外科应用。受控的制造仍然是一个巨大的挑战。在这项工作中，通过独特的溶液-空气界面方法制备了大规模的半透明羟基磷灰石（HAP）和硫酸软骨素（ChS）复合膜。该产品极好地代表了牙釉质的特征性分层“棱镜”结构。我们证明了该膜是由界面处的蒸发诱导形核和随后的自限球状生长形成的。当溶液蒸发时，界面处的过饱和度增加，并且局部高过饱和度会触发那里的优选成核作用。球晶的生长受ChS的调节，并受球晶之间以及溶液与空气之间的界面的限制。因此，产生具有分级自组装棱镜结构的HAP / ChS膜。我们强调该机制可以很好地解释牙釉质和自组装纳米棒阵列中独特的棱镜结构形成。这些发现提供了对自然界中的分层组装（例如，牙釉质的组装）的基础的见解。而且，该方法可以扩展为设计和发展其他复杂的功能结构。

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