Intermediate colloidal formation and the varying width of periodic precipitation bands in reaction–diffusion systems

George, Jacob; Varghese, George

doi:10.1016/j.jcis.2004.08.152

Cited by 32 publications

(24 citation statements)

References 36 publications

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“…As the diffusion front proceeds, the precipitate is deposited in the form of bands at specific distances. 5,6 A large number of Liesegang systems consisting of hydroxides, 7,8 sulfides, 9 chromates and dichromates, 10 and phosphates 11,12 are reported.…”

Section: Introductionmentioning

confidence: 99%

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO₃ + KBr) System in Agar Gel

et al. 2019

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A periodically precipitating system wherein interband distance successively decreases is known as revert Liesegang banding. The phenomenon is rare, and the underlying mechanism is implicit. In the present paper, the Liesegang system comprising of AgNO 3 and KBr as the outer and inner electrolyte pair showing revert banding in agar gel by employing a 1D experimental setup is studied under varying concentrations of participating species. Revert banding was observed under all the experimental conditions. The concentrations of inner and outer electrolytes were found to play a major role in reverting since they build the ionic strength inside Liesegang tubes. We hypothesize that the band reverting is the interplay of van der Waals and electrical double-layer interactions, and hence classical DLVO (Derjaguin–Landau–Verwey–Overbeek) theory can be applied to interpret reverting. We propose that revert deposition of precipitates is the outcome of flocculation and peptization of sols, which is the manifestation of balancing attractive and repulsive interactions acting on colloidal particles responsible for band formation.

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Section: Introductionmentioning

confidence: 99%

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO₃ + KBr) System in Agar Gel

et al. 2019

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“…A lot of theoretical mechanisms have been proposed for the phenomenon (Henish, 1991;Lagzi and Ká rmá n, 2003;Horvá th and Tó th, 1998). The existence of precipitation patterns is usually explained by instability of colloidal substances arising from the reactants (Müller and Ross, 2003;George and Varghese, 2005;Tyson and Keener, 1988).…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental investigation of immunoprecipitation pattern formation in gel medium

Федоров

Курочкин

Мартынов

et al. 2010

Journal of Theoretical Biology

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“…Liesegang patterns (or rings) are formed as a result of a simple reaction, typically in gels, when the reaction product precipitates in a recurrent fashion; see Figure 1.1, below. Liesegang patterns can be observed in experimental setups, in numerical [24], left, and [7] simulations, as well as in natural patterns. We refer to [6,8] for recent reviews on experimental and modeling aspects of Liesegang patterns, to [16] for a comparison with natural patterns, and to [1,5,6,33] for potential applications towards a self-organized patterned deposition in the fabrication of materials at the sub-micron scale.…”

Section: Phenomenology and Modelsmentioning

confidence: 90%

Robustness of Liesegang patterns

Scheel

2009

Nonlinearity

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We propose a conceptual analysis of stationary reaction-diffusion patterns with geometric spatial scaling laws as observed in Liesegang patterns. We give necessary and sufficient conditions for such patterns to occur in a robust fashion. Main ingredients are a skewproduct structure in the kinetics, caused by irreversible chemical reactions, the existence of localized spikes, and slowly decaying boundary layers. The proofs invoke the analysis of homoclinic orbits in orbit-flip position for the spatial dynamics. In particular, we show that there exists a manifold of initial conditions that do not converge to the equilibrium but to the homoclinic orbit as a set.

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Intermediate colloidal formation and the varying width of periodic precipitation bands in reaction–diffusion systems

Cited by 32 publications

References 36 publications

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO₃ + KBr) System in Agar Gel

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO₃ + KBr) System in Agar Gel

Theoretical and experimental investigation of immunoprecipitation pattern formation in gel medium

Robustness of Liesegang patterns

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Intermediate colloidal formation and the varying width of periodic precipitation bands in reaction–diffusion systems

Cited by 32 publications

References 36 publications

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO3 + KBr) System in Agar Gel

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO3 + KBr) System in Agar Gel

Theoretical and experimental investigation of immunoprecipitation pattern formation in gel medium

Robustness of Liesegang patterns

Contact Info

Product

Resources

About

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO₃ + KBr) System in Agar Gel

Revert Banding in One-Dimensional Periodic Precipitation of the (AgNO₃ + KBr) System in Agar Gel