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

Rita Tóth, Roché M. Walliser, István Lagzi, Florent Boudoire, Marcel Düggelin, Artur Braun, Catherine E. Housecroft, Edwin C. Constable

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)8367-8374
Number of pages8
JournalSoft Matter
Volume12
Issue number40
DOIs
Publication statusPublished - 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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    Tóth, R., Walliser, R. M., Lagzi, I., Boudoire, F., Düggelin, M., Braun, A., Housecroft, C. E., & Constable, E. C. (2016). Probing the mystery of Liesegang band formation: Revealing the origin of self-organized dual-frequency micro and nanoparticle arrays. Soft Matter, 12(40), 8367-8374. https://doi.org/10.1039/c6sm01564f