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Flow-driven pattern formation in the calcium-oxalate system.

Bíborka Bohner1, Balázs Endrődi1, Dezső Horváth2

  • 1Department of Physical Chemistry and Materials Science, University of Szeged, Aradi vértanúk tere 1., Szeged H-6720, Hungary.

The Journal of Chemical Physics
|May 2, 2016
PubMed
Summary
This summary is machine-generated.

Controlled calcium flow into oxalate solution creates spatial gradients, influencing calcium oxalate precipitation patterns. Stronger gravity currents favor the formation of calcium oxalate dihydrate over monohydrate.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Precipitation reactions are fundamental in geochemistry and materials science.
  • Understanding pattern formation in precipitation is crucial for controlling material properties.
  • Spatial gradients can significantly alter reaction pathways and product morphology.

Purpose of the Study:

  • To experimentally investigate the precipitation of calcium oxalate under controlled spatial gradients.
  • To analyze the influence of reactant flow and resulting convection on pattern formation.
  • To construct a phase diagram and characterize the evolving precipitate structures.

Main Methods:

  • Controlled flow of calcium ions into an oxalate solution to create spatial gradients.
  • Observation and quantitative characterization of precipitate patterns (diameters, gravity flow height).
  • Analysis of phase transitions between different calcium oxalate hydrates.

Main Results:

  • Density differences between reactants induce a gravity current, driving spatiotemporal pattern formation.
  • Low flow rates yield compact calcium oxalate monohydrate structures.
  • High flow rates and strong gravity currents favor the thermodynamically unstable calcium oxalate dihydrate.

Conclusions:

  • Gravity-driven convection plays a critical role in calcium oxalate precipitation pattern formation.
  • Flow rate and resulting convection dictate the stable or metastable hydrate phase formed.
  • This study provides insights into controlling precipitate morphology through fluid dynamics.