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- W2321810616 abstract "We report a two-dimensional (2D) reaction-diffusion system that exhibits a superdiffusive propagating wave with anomalous cusp-like contours. This wave results from a leading precipitation reaction (wavefront) and a trailing redissolution (waveback) between initially separated mercuric chloride and potassium iodide to produce mercuric iodide precipitate (HgI2) in a thin sheet of a solid hydrogel (agar) medium. The propagation dynamics is accompanied by continuous polymorphic transformations between the metastable yellow crystals and the stable red crystals of HgI2. We study the dynamics of wavefront and waveback propagation that reveals interesting anomalous superdiffusive behavior without the influence of external enhancement. We find that a transition from superdiffusive to subdiffusive dynamics occurs as a function of outer iodide concentration. Inner mercuric concentrations lead to the transition from the anomalous cusp-like to cusp-free regular bands. While gel concentration affects the speed of propagation of the wave, it has no effect on its shape or on its superdiffusive dynamics. Microscopically, we show that the macroscopic wave propagation and polymorphic transformations are accompanied by an Ostwald ripening mechanism in which larger red HgI2 crystals are formed at the expense of smaller yellow HgI2 crystals." @default.
- W2321810616 created "2016-06-24" @default.
- W2321810616 creator A5019575540 @default.
- W2321810616 creator A5071608453 @default.
- W2321810616 date "2014-05-22" @default.
- W2321810616 modified "2023-09-26" @default.
- W2321810616 title "Superdiffusive Cusp-Like Waves in the Mercuric Iodide Precipitate System and Their Transition to Regular Reaction Bands" @default.
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- W2321810616 doi "https://doi.org/10.1021/jp502217z" @default.
- W2321810616 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24813667" @default.
- W2321810616 hasPublicationYear "2014" @default.
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