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Research and Development of High-performance Explosives
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Ultrasonically controlled particle size distribution of explosives: a safe method.

Mohan Narayan Patil1, G M Gore, Aniruddha B Pandit

  • 1Chemical Engineering Division, UICT, Matunga, Mumbai 400 019, India.

Ultrasonics Sonochemistry
|May 29, 2007
PubMed
Summary

This study demonstrates a safer method for reducing the size of high-energy materials (HEMs) using ultrasonically enhanced antisolvent precipitation. This technique offers improved crystal size control and increased yield for energetic compounds like CL-20.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Crystallization Science

Background:

  • Conventional mechanical methods for size reduction of high-energy materials (HEMs) pose safety risks due to sensitivity to friction and impact.
  • Modified crystallization techniques offer a safer alternative for controlling HEM particle size and morphology.
  • Antisolvent precipitation is a key crystallization method, with parameters like solvent-antisolvent ratio and temperature influencing product yield and crystal characteristics.

Purpose of the Study:

  • To investigate the effect of ultrasonically generated acoustic cavitation on the solvent-antisolvent precipitation process for HEMs.
  • To achieve safe and efficient size control and distribution manipulation of CL-20, a high-energy explosive compound.
  • To compare the outcomes of ultrasonically enhanced precipitation with conventional antisolvent methods regarding safety, speed, and yield.

Main Methods:

  • Solvent-antisolvent precipitation technique was employed.
  • Ultrasonically generated acoustic cavitation was introduced to induce nucleation.
  • Key parameters such as temperature, antisolvent addition rate, agitation, solvent-antisolvent ratio, and crystallization time were adjusted.
  • The high-energy material CL-20 was used as the target compound.

Main Results:

  • Ultrasonic cavitation successfully enhanced the solvent-antisolvent precipitation process for CL-20.
  • Achieved safe and rapid size control and size distribution manipulation of CL-20 crystals.
  • Observed an increase in the final mass yield compared to conventional antisolvent precipitation.
  • Demonstrated improved control over crystal size and morphology.

Conclusions:

  • Ultrasonically assisted antisolvent precipitation provides a safer and more efficient method for processing high-energy materials like CL-20.
  • This technique allows for precise control over crystal size and distribution, leading to enhanced material properties.
  • The enhanced nucleation from cavitation improves yield and processing efficiency, offering significant advantages over traditional methods.