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Controlling crystallisation with audible low frequency sound.

Yasmin C S Figueiredo1, Thiago G Tabuti1, Thaisa B F Moraes1

  • 1Laboratório Nanotecnologia e Engenharia de Processos-- NEP, Universidade de São Paulo, CEP 12602-810, Lorena, SP, Brazil. tribonier@up.br.

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Summary
This summary is machine-generated.

Low-frequency audible sound influences organic compound crystallization, creating distinct solid forms. Sound frequency and amplitude control polymorphs, morphologies, and crystal orientation during solution crystallization.

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Area of Science:

  • Solid-state chemistry
  • Physical chemistry
  • Crystallization science

Background:

  • Crystallization is crucial for determining the physical properties of organic compounds.
  • Controlling crystal form (polymorphism) is essential for pharmaceutical and material science applications.
  • External stimuli are increasingly explored to influence crystallization processes.

Purpose of the Study:

  • To investigate the effect of low-frequency audible sound on the solution crystallization of organic compounds.
  • To determine if sound can induce distinct solid forms and control crystallization outcomes.
  • To explore the influence of sound frequency and amplitude on crystal morphology and orientation.

Main Methods:

  • Solution crystallization experiments were conducted on specific organic compounds (ROY and anthranilic acid).
  • Crystallization was performed under controlled audible sound conditions (varying frequency and amplitude).
  • Control experiments were performed under silent crystallization conditions for comparison.

Main Results:

  • Audible sound significantly altered the crystallization process compared to silent conditions.
  • Distinct polymorphs and concomitant forms were observed under sound influence.
  • Novel crystal morphologies and preferred orientations were achieved, dependent on sound parameters.
  • Sound-driven crystallization yielded different outcomes than conventional methods.

Conclusions:

  • Low-frequency audible sound is an effective external stimulus for controlling organic compound crystallization.
  • Sound can be used to selectively produce desired solid forms, morphologies, and orientations.
  • This research opens new avenues for sound-assisted crystallization in materials and pharmaceutical development.