Marangoni instability in the iodate–arsenous acid reaction front

Pópity-Tóth, Éva; Pótári, G.; Erdős, István; Horváth, Dezsö; Tóth, Ágota

doi:10.1063/1.4890727

Cited by 16 publications

(20 citation statements)

References 43 publications

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“…No dependency of the front head shape on the starch concentration was seen. This finding are opposite to observation of Marangoni instability in the IAA reaction reported by Popity‐Toth et al . Moreover shape of the front head corresponds to the shape seen for the covered experiments.…”

Section: Discussioncontrasting

confidence: 99%

“…Although, accumulation of iodine in the solution (the dark color of the solution behind the reaction front) was observed, the velocity increase and the change of the shape of front head caused by Marangoni instability described by Popity-Toth et al [26] were not seen. For the lowest starch concentration, the reaction zone was a thin dark object, iodine did not accumulate in the solution, and the front velocity was observed as the highest.…”

Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 88%

“…Under a certain condition, Marangoni convection may develop in the IAA reaction system . The Marangoni convection requires system in which changes of surface tension occur.…”

Section: Introductionmentioning

confidence: 99%

“…Under a certain condition, Marangoni convection may develop in the IAA reaction system. [26] The Marangoni convection requires system in which changes of surface tension occur. For the IAA reaction system, the Marangoni convection was observed in experiments performed with free liquid/gas interface and ratio R = 2.8.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Starch Indicator on the Buoyantly Unstable Iodate‐Arsenous Acid Reaction Front

2017

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Buoyantly unstable chemical fronts, which propagated in the iodate arsenous acid reaction system, were studied experimentally in 3D space and numerically in vertical 2D space. The fronts invaded the reaction solution from the left top corner in horizontal and vertical directions. Before the starch effects were examined condition under which friction did not influence the front propagation were found both experimentally and numerically. The critical solution depth and the critical distance between lateral walls, above which the front speed is not influenced by friction, were determined. Moreover, the results also show that the 2D simulations correspond to a vertically oriented plane placed the 3D experiments in 1/2 of the walls distance and along the x axis of the reactor. Importantly, those results also show that friction caused by the presence of solid side walls exclude pseudo 2D experiments to be compared with 2D simulations, when flow is involved. The effects of starch on the IAA fronts were studied experimentally at conditions, at which the friction did not influence the front propagation. Although the starch is used in very low concentrations as an iodine indicator, the experimental results show that starch presence strongly affects the dynamics of the liquid IAA reaction system. The presence of starch decreases the front velocity independently on the direction of the front propagation. Starch also affects the pattern formation. A possible mechanism is discussed.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 88%

“…Under a certain condition, Marangoni convection may develop in the IAA reaction system . The Marangoni convection requires system in which changes of surface tension occur.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the Starch Indicator on the Buoyantly Unstable Iodate‐Arsenous Acid Reaction Front

2017

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Surface tension- and buoyancy-driven flows across horizontally propagating chemical fronts

Tiani

Wit

Rongy

2018

Advances in Colloid and Interface Science

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Compatible Mechanism for a Simultaneous Description of the Roebuck, Dushman, and Iodate–Arsenous Acid Reactions in an Acidic Medium

Valkai

Horváth

2016

Inorg. Chem.

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The iodine-arsenous acid (Roebuck), iodide-iodate (Dushman), and iodate-arsenous acid reactions have been studied simultaneously by a stopped-flow technique by monitoring the absorbance-time profiles at the isosbestic point of the I2/I3(-) system (468 nm). Using the well-accepted rate coefficients of iodine hydrolysis, we have proven that iodine is the kinetically active species of the iodine-arsenous acid reaction. Strong iodide inhibition of this system is explained by a rapidly established equilibrium between iodine and arsenous acid to produce an iodide ion, a hydrogen ion, and a short-lived intermediate H2AsO3I, which is shifted far to the left. Taking into consideration the generally accepted kinetic model of the Dushman reaction where I2O2 plays a key role to account for all of the most important observations in this subsystem and a sequence of simple formal oxygen-transfer reactions between arsenous acid and iodic acid as well as iodous acid and hypoiodous acid, we propose a 13-step comprehensive kinetic model, including seven rapidly established equilibria with only six fitted parameters, that is able to explain all of the most important characteristics of the kinetic curves of all of the title systems both individually and simultaneously.

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Marangoni instability in the iodate–arsenous acid reaction front

Cited by 16 publications

References 43 publications

Effects of the Starch Indicator on the Buoyantly Unstable Iodate‐Arsenous Acid Reaction Front

Effects of the Starch Indicator on the Buoyantly Unstable Iodate‐Arsenous Acid Reaction Front

Surface tension- and buoyancy-driven flows across horizontally propagating chemical fronts

Compatible Mechanism for a Simultaneous Description of the Roebuck, Dushman, and Iodate–Arsenous Acid Reactions in an Acidic Medium

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