Liesegang patterns: Complex formation of precipitate in an electric field

Pramana

István Lagzi1¹ 

[1] Department of Physical Chemistry, Eötvös University, P.O. Box 32, Pázmány Péter sétány 1. A, Budapest, H-1518, Hungary$$

关键词: Liesegang;    precipitation patterns;    electric field;    complex formation.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Formation of 1D Liesegang patterns was studied numerically in precipitation and reversible complex formation of precipitate scenarios in an electric field. The Ostwald’s supersaturation model reported by Büki, Kárpáti-Smidróczki and Zrínyi (BKZ model) was extended further. In the presence of an electric field the position of the first and the last bands (𝑋𝑛) measured from the junction point of the outer and the inner electrolytes can be described by the function 𝑋𝑛 = 𝑎1 $𝜏_{𝑛}^{1/2}$ + 𝑎2 𝜏𝑛 + 𝑎3 , where 𝜏𝑛 is the time elapsed until the nth band formation, 𝑎1, 𝑎2 and 𝑎3 are constants. The variation of the total number of bands with different electric field strengths (𝜖) has a maximum. For higher 𝜖 one can observe a moving precipitation zone that becomes wider due to precipitation and reversible complex formation.

【 授权许可】

Unknown