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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2016
Author Tóth Rita , M. Walliser Roche, Lagzi István , Boudoire Florent, Düggelin Marcel , Braun Artur, E. Housecroft Catherine, C. Constable Edwin,
Project Self-organization processes to pattern thin films: A bottom-up approach for photoelectrodes
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Original article (peer-reviewed)

Journal Soft Matter
Volume (Issue) 12(40)
Page(s) 8367 - 8374
Title of proceedings Soft Matter
DOI 10.1039/C6SM01564F

Open Access

Type of Open Access Publisher (Gold Open Access)


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.