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Updated: Jun 13, 2025

Reliable Mechanochemistry: Protocols for Reproducible Outcomes of Neat and Liquid Assisted Ball-mill Grinding Experiments
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Strategies to mitigate electrostatic charging during coffee grinding.

Joshua Méndez Harper1, Robin E Bumbaugh2, Christopher H Hendon2

  • 1Electrical and Computer Engineering, Portland State University, 1900 SW 4th Avenue, Portland, Oregon 97201, US.

Iscience
|September 16, 2024
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Summary

Adding a small amount of water to coffee beans before grinding significantly improves espresso extraction. This de-electrification prevents clumping, leading to a more efficient and concentrated coffee brew.

Keywords:
Applied sciencesFood scienceMaterials scienceNatural sciences

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Area of Science:

  • Food Science
  • Tribology
  • Materials Science

Background:

  • Coffee grinding produces electrostatic charges on particles, leading to clumping and inconsistent brewing.
  • Particle aggregation negatively impacts liquid-solid surface interactions during extraction.
  • Variable extraction quality is a persistent challenge in coffee brewing.

Purpose of the Study:

  • To investigate methods for mitigating electrostatic charges in coffee grounds.
  • To evaluate the impact of charge reduction on coffee particle size distribution and espresso extraction.
  • To identify practical strategies for improving coffee brewing consistency.

Main Methods:

  • Four charge mitigation strategies were tested, including water addition and ion bombardment.
  • Particle size distribution was analyzed after grinding treated beans.
  • Espresso extraction efficiency was measured for coffee treated with different methods.

Main Results:

  • Water inclusion (less than 0.05 mL/g) effectively reduced particle clumping and static.
  • Wetting beans altered particle size distribution, preventing fine particle adhesion.
  • Espresso extracts from darker roasts showed at least a 15% increase in coffee concentration with water treatment.

Conclusions:

  • De-electrifying coffee beans with minimal water during grinding is a practical solution.
  • This method enhances particle size control, leading to improved espresso extraction efficiency.
  • Water-assisted de-electrification offers a straightforward way to boost coffee brew quality.