Liesegang rings


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Lie·se·gang rings

(lē'sĕ-gahng),
colored rings of precipitated silver chromate formed when a drop of concentrated silver nitrate is added to the surface of a gel (such as gelatin, agar, or silica gel) containing potassium dichromate.

Liesegang,

Ralph E., German chemist, 1869-1947.
Liesegang rings - colored rings of precipitated silver chromate formed when a drop of concentrated silver nitrate is added to the surface of a gel containing potassium dichromate.
References in periodicals archive ?
It has been recently demonstrated (Jiang & Sakurai, 2016) that a gel film with a thickness of a few tenths of a nanometer allowed the formation of micrometer-scale bandwidth Liesegang rings. At this scale, it is already feasible to consider potential applications for periodic precipitations in terms of nanotechnological developments as it is possible to synthesize materials with different physical properties through reaction-diffusion processes (Lagzi, 2012; Walliser, et al., 2015).
Another interesting aspect of Liesegang rings or bands is the synthesis of monodisperse nanomaterials (Lagzi, 2012; Walliser, et al., 2015).
(6) Concentric calcified deposits (Liesegang rings) that resemble psammoma bodies are formed in the amyloid material.