Collect. Czech. Chem. Commun. 2000, 65, 1438-1442

Gravity Effect on the Formation of Periodic Precipitation Patterns

Vladislav Holba* and Frederik Fusek

Department of Physical Chemistry, Faculty of Science, Comenius University, 842 15 Bratislava, Slovak Republic


The effect of gravity on the formation of Liesegang patterns of Ag2Cr2O7 in gelatin and that of PbI2 in agar was investigated. Spatial arrangement of Liesegang bands was measured in the parallel and antiparallel orientation to the gravitational field in a single sample with all other parameters kept fixed. The experimental results are discussed in terms of the prenucleation theory of periodic precipitation.

Keywords: Liesegang bands; Gravitational field; Spatial coefficients; Precipitation; Silver dichromate; Lead iodide; Gels; Colloids.

References: 14 live references.