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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Tubular precipitation and redox gradients on a bubbling template.
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Tubular precipitation and redox gradients on a bubbling template.

机译：鼓泡模板上的管状沉淀和氧化还原梯度。

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摘要

Tubular structures created by precipitation abound in nature, from chimneys at hydrothermal vents to soda straws in caves. Their formation is controlled by chemical gradients within which precipitation occurs, defining a surface that templates the growing structure. We report a self-organized periodic templating mechanism producing tubular structures electrochemically in iron-ammonium-sulfate solutions; iron oxides precipitate on the surface of bubbles that linger at the tube rim and then detach, leaving behind a ring of material. The acid-base and redox gradients spontaneously generated by diffusion of ammonia from the bubble into solution organize radial compositional layering within the tube wall, a mechanism studied on a larger scale by complex Liesegang patterns of iron oxides formed as ammonia diffuses through a gel containing FeSO(4). When magnetite forms within the wall, a tube may grow curved in an external magnetic field. Connections with free-boundary problems in speleothem formation are emphasized.
机译：自然界中，由降水形成的管状结构比比皆是，从热液喷口的烟囱到洞穴中的苏打水。它们的形成受其中发生沉淀的化学梯度的控制，该化学梯度限定了形成生长结构模板的表面。我们报告了一种自组织的周期性模板机制，该机制在硫酸铁铵硫酸盐溶液中电化学生成管状结构。氧化铁沉淀在留在管子边缘的气泡表面，然后分离，留下一圈材料。氨从气泡扩散到溶液中而自发产生的酸碱梯度和氧化还原梯度在管壁内组织了径向成分分层，这种机理是通过氨在含FeSO的凝胶中扩散形成的氧化铁的复杂Liesegang图案进行大规模研究的机制。 （4）。当磁铁矿在壁内形成时，管子可能会在外部磁场中弯曲。强调了与鞘膜形成中的自由边界问题的联系。

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