Dynamics of a complex diffusion-precipitation-re-dissolution Liesegang pattern

Msharrafieh, Maysam; Sultan, Rabih

doi:10.1016/j.cplett.2006.01.054

Cited by 13 publications

(10 citation statements)

References 15 publications

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“… ( A to C ) Schematics of various experimental setups. ( D ) Irregular band spacing in the Co(OH) 2 /Ni(OH) 2 precipitation-redissolution system [adapted with permission from Msharrafieh and Sultan ( 163 )]. ( E to G ) Precipitation pulses (E), distorted fronts (F) [adapted with permission from Volford et al .…”

Section: Dynamic Precipitation-dissolution Patternsmentioning

confidence: 99%

Self-organization in precipitation reactions far from the equilibrium

2016

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Section: Dynamic Precipitation-dissolution Patternsmentioning

confidence: 99%

Self-organization in precipitation reactions far from the equilibrium

2016

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“…This multitude of processes and chemical species involved yields the complex system of nonlinear equations in the model given by eqs 9-11. In a recent study, 31 the average cobalt ion concentration over a tube of length L and can be written as X h(t) ) ∫ 0 L X(x,t) dx. [Co(OH) 2 (aq)] is represented by C h A (t) ) ∫ 0 L C A (x,t) dx, and the mass of the solid cobalt hydroxide m Co(OH)2(s) is computed using the density of large particles F j A (t) ) ∫ 0 L F A (x,t) dx.…”

Section: 2mentioning

confidence: 99%

Front Propagation in Patterned Precipitation. 3. Composition Variations in Two-Precipitate Stratum Dynamics

et al. 2007

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This paper is a study of the composition dynamics of Liesegang band strata of Co(OH)2 and Ni(OH)2 from NH4OH, with redissolution by complex formation with ammonia. At a fixed time, the cobalt hydroxide composition was found to exhibit a random variation with band number, yet within a general overall decrease. The decrease with band number becomes more pronounced as the initial concentrations of Co2+ and Ni2+ get closer to each other. At equal concentrations, periodic oscillations in Co(OH)2 composition appear over consecutive bands. The time evolution of the total Co(OH)2 mass percent (over the entire pattern of strata) passes through a maximum. The dynamics of this complex system has been simulated by theoretical calculations using the model of Müller and Polezhaev, modified by Al-Ghoul and Sultan in a series of two papers in J. Phys. Chem. A; the present paper is the third in the series. The simulations capture the essential features of the experimentally observed dynamics.

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“…To form a Liesegang pattern, we used a gel because it can prevent precipitate sedimentation and hydrodynamic turbulence. A salt was added to a prepared gelatin-based gel [7] [8]. In this study, gelatin and salt concentration were constant, and we used three salt species containing the same metal ion: Co(NO 3 ) 2 , CoCl 2 , and CoSO 4 ( Table 1).…”

Section: Methodsmentioning

confidence: 99%

Precipitation Behavior in Liesegang Systems under Microwave Irradiation

Kanazawa¹,

Asakuma²

2014

JCPT

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We studied precipitation patterns in a Liesegang system under microwave irradiation in order to investigate metal salt diffusion in an electrolyte gel. The salt species and microwave irradiation power were varied. Microwave irradiation induced periodic patterns of precipitation because polar molecules vibrate and rotate in an electromagnetic field. For example, the number of patterns increased with the irradiation power. Accordingly, microwave irradiation nonlinearly accelerated the diffusion of ionic molecules.

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Dynamics of a complex diffusion-precipitation-re-dissolution Liesegang pattern

Cited by 13 publications

References 15 publications

Self-organization in precipitation reactions far from the equilibrium

Self-organization in precipitation reactions far from the equilibrium

Front Propagation in Patterned Precipitation. 3. Composition Variations in Two-Precipitate Stratum Dynamics

Precipitation Behavior in Liesegang Systems under Microwave Irradiation

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