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Pattern Formation in Precipitation Reactions: The Liesegang Phenomenon.
Langmuir ( IF 3.7 ) Pub Date : 2020-01-07 , DOI: 10.1021/acs.langmuir.9b03018
Hideki Nabika , Masaki Itatani , István Lagzi 1, 2
Affiliation  

Pattern formation is a frequent phenomenon in physics, chemistry, biology, and materials science. Bottom-up pattern formation usually occurs in the interaction of the transport phenomena of chemical species with their chemical reaction. The oldest pattern formation is the Liesegang phenomenon (or periodic precipitation), which was discovered and described in 1896 by Raphael Edward Liesegang, who was a German chemist and photographer who was born 150 years ago. The purpose of this feature article is to provide a comprehensive overview of this type of pattern formation. Liesegang banding occurs because of the coupling of the diffusion process of the reagents with their chemical reactions in solid hydrogels. We will discuss several phenomena observed and discovered in the past century, including reverse patterns, precipitation patterns with dissolution (due to complex formation), helicoidal patterns, and precipitation waves. Additionally, we will review all existing models of the Liesegang phenomenon including pre- and postnucleation scenarios. Finally, we will highlight several applications of periodic precipitation.

中文翻译:

沉淀反应中的模式形成:里瑟冈现象。

模式形成是物理学,化学,生物学和材料科学中的常见现象。自下而上的模式形成通常发生在化学物质的传输现象与其化学反应的相互作用中。最早的图案形成是Liesegang现象(或周期性降水),该现象是由Raphael Edward Liesegang于1896年发现并描述的,Raphael Edward Liesegang是150年前出生的德国化学家和摄影师。这篇专题文章的目的是提供这种类型的图案形成的全面概述。由于试剂在固体水凝胶中的扩散过程与其化学反应之间的耦合,导致发生李斯刚带。我们将讨论在过去一个世纪中观察和发现的几种现象,包括反向模式,具有溶解(由于形成复合物),螺旋形和降水波的降水模式。此外,我们将回顾Liesegang现象的所有现有模型,包括成核前和成核后的情况。最后,我们将重点介绍周期性降水的几种应用。
更新日期:2020-01-07
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