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Zig-zag structures in silver dichromate precipitate.
- Source :
-
Chaos . Aug2023, Vol. 33 Issue 8, p1-8. 8p. - Publication Year :
- 2023
-
Abstract
- Precipitation patterns are commonly concentric rings forming in a Petri dish or parallel bands appearing in a test tube (Liesegang phenomenon). The rings frequently consist of a number of convex segments that are separated from each other by spaces devoid of precipitate resulting in small gaps (dislocations). Along these gaps, the so-called zig-zag structures can form, which connect one side of a gap with its opposite side. We observe that the occurrence of zig-zags requires a minimum thickness of the reactive layer (≥ 0.8 mm). This fact together with microscopic evidence indicates their three-dimensional character. One finds that at the very beginning of the precipitation reaction a curling process starts in the corresponding contour lines. These observations suggest structures of a helicoid with the axis perpendicular to the plane of the reaction–diffusion front to pass through the layer. Zig-zags are not parallel to the reaction plane, i.e., they are not formed periodically, but evolve continuously as a rotating spiral wave. Thus, their topology is closely related to helices in a test tube. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PRECIPITATION (Chemistry)
*SILVER
Subjects
Details
- Language :
- English
- ISSN :
- 10541500
- Volume :
- 33
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Chaos
- Publication Type :
- Academic Journal
- Accession number :
- 171343724
- Full Text :
- https://doi.org/10.1063/5.0153619