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Microfluidic antisolvent crystallization reveals critical solution volumes impact chiral symmetry breaking in sodium chlorate crystals. Smaller volumes promote single enantiomer formation, while larger volumes increase the likelihood of both enantiomers.

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Area of Science:

  • Crystallization Science
  • Physical Chemistry
  • Materials Science

Background:

  • Chiral symmetry breaking (CSB) is a fundamental phenomenon in crystal formation.
  • Controlling CSB in enantiomeric crystallization is crucial for producing pure chiral compounds.
  • Traditional methods often lack precise control over crystallization conditions.

Purpose of the Study:

  • To investigate the influence of solution volume on chiral symmetry breaking (CSB) in sodium chlorate crystals.
  • To explore the use of microfluidic antisolvent crystallization for controlled chiral crystallization.
  • To establish a relationship between emulsion droplet volume and CSB outcomes.

Main Methods:

  • Utilized a microfluidic device to generate uniform emulsion droplets of sodium chlorate solution in dodecane.
  • Employed an antisolvent crystallization approach by introducing ethanol into the continuous phase.
  • Quantitatively analyzed and visualized crystallization within individual emulsion droplets.

Main Results:

  • Observed 100% chiral symmetry breaking (CSB) within a specific critical emulsion volume.
  • Found that exceeding this critical volume increased the probability of forming both enantiomers.
  • Demonstrated a direct correlation between solution volume and the extent of CSB.

Conclusions:

  • Solution volume is a critical parameter influencing chiral symmetry breaking in sodium chlorate crystallization.
  • Microfluidic antisolvent crystallization offers precise control over CSB phenomena.
  • The observed volume dependence is attributed to rapid molecule depletion and suppressed primary nucleation beyond the critical volume.