Precipitation Pattern Formation in the Presence of Imposed Concentration Gradients

ZHENG Juhua; GAO Qingyu; WANG Qun; WANG Hai; WANG Jichang

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Precipitation Pattern Formation in the Presence of Imposed Concentration Gradients

ZHENG Juhua 1,GAO Qingyu 1 * #,WANG Qun 1,WANG Hai 1,WANG Jichang 2

1.College of Chemical Engineering,China University of Mining and Technology

2.Department of Chemistry and Biochemistry, University of Windsor

*Correspondence author

#Submitted by

Subject:

Funding: 国家自然基金,教育部博士点基金,教育部新世纪人才培养计划（No.20573134,20050290512,NCET05-0477）

Opened online:12 April 2007

Accepted by: none

Citation: ZHENG Juhua,GAO Qingyu ,WANG Qun.Precipitation Pattern Formation in the Presence of Imposed Concentration Gradients[OL]. [12 April 2007] http://en.paper.edu.cn/en_releasepaper/content/12173

We investigated precipitation pattern formation in a medium in which the source substance was inhomogeneously distributed. Depending on the imposed concentration gradient and the location where the second substance was added, various new precipitation structures such as bifurcated segments, budding patterns, and Liesegang rings segregated with broken circles were observed. Dependence of those new structures on the solubility of precipitate, supersaturation level, and nucleation and aggregation thresholds were systematically characterized. Our calculation further illustrates that despite of the presence of an imposed concentration gradient, the location of Xn of the nth band and its time of formation tn still satisfies a simple spacing and time law, Xn ～ tn1/2, however the distance between two adjacent precipitation bands departs from the linear relationship after broken rings had developed in the medium.

Keywords:Nucleation-growth model, Liesegang rings

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