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Issue 40, 2016
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Probing the mystery of Liesegang band formation: revealing the origin of self-organized dual-frequency micro and nanoparticle arrays

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Abstract

Periodic precipitation processes in gels can result in impressive micro- and nanostructured patterns known as periodic precipitation (or Liesegang bands). Under certain conditions, the silver nitrate–chromium(VI) system exhibits the coexistence of two kinds of Liesegang bands with different frequencies. We now present that the two kinds of bands form independently on different time scales and the pH-dependent chromate(VI)–dichromate(VI) equilibrium controls the formation of the precipitates. We determined the spatial distribution and constitution of the particles in the bands using focused ion beam-scanning electron microscopy (FIB-SEM) and scanning transmission X-ray spectromicroscopy (STXM) measurements. This provided the necessary empirical input data to formulate a model for the pattern formation; a model that quantitatively reproduces the experimental observations. Understanding the pattern-forming process at the molecular level enables us to tailor the size and the shape of the bands, which, in turn, can lead to new functional architectures for a range of applications.

Graphical abstract: Probing the mystery of Liesegang band formation: revealing the origin of self-organized dual-frequency micro and nanoparticle arrays

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Supplementary files

Article information


Submitted
08 Jul 2016
Accepted
01 Sep 2016
First published
02 Sep 2016

This article is Open Access

Soft Matter, 2016,12, 8367-8374
Article type
Paper

Probing the mystery of Liesegang band formation: revealing the origin of self-organized dual-frequency micro and nanoparticle arrays

R. Tóth, R. M. Walliser, I. Lagzi, F. Boudoire, M. Düggelin, A. Braun, C. E. Housecroft and E. C. Constable, Soft Matter, 2016, 12, 8367
DOI: 10.1039/C6SM01564F

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