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Hot liquid marbles.

Pritam Kumar Roy1, Yui Takai1, Rui Matsubara1

  • 1Department of Mechanical Engineering, School of Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.

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Summary
This summary is machine-generated.

Hot liquid marbles, inspired by aphids, offer unique handling of small liquid volumes. However, temperature differences can cause instability and increased friction due to liquid bridging, but strategies exist to maintain their integrity.

Keywords:
condensationdropsliquid marblesstatic friction

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Area of Science:

  • Soft Matter Physics
  • Microfluidics
  • Biophysics

Background:

  • Insects like aphids utilize hydrophobic coatings to manage viscous liquids, inspiring the creation of liquid marbles.
  • Liquid marbles offer advantages in microfluidics, biomedical analysis, and chemistry due to their low friction and high mobility.
  • The thermal stability and friction of hot liquid marbles remain largely unexplored, limiting their application in temperature-sensitive processes.

Purpose of the Study:

  • To investigate the stability and static friction of hot liquid marbles on substrates with a temperature difference (ΔT).
  • To understand the mechanisms behind hot liquid marble instability and friction changes at elevated temperatures.
  • To identify strategies for preventing hot liquid marble rupture and excessive friction.

Main Methods:

  • Experimental analysis of hot liquid marbles placed on substrates with controlled temperature differences (ΔT).
  • Observation of liquid evaporation, condensation, and liquid bridge formation beneath the marbles.
  • Measurement of static friction on both hydrophilic and hydrophobic substrates under varying temperature conditions.

Main Results:

  • Large ΔT leads to liquid evaporation and condensation, forming liquid bridges that cause marble rupture on hydrophilic substrates.
  • Increased liquid bridge density due to condensation results in higher static friction on hydrophobic substrates at larger ΔT.
  • Static friction transitions from solid friction dominance at small ΔT to liquid pinning force dominance at larger ΔT.

Conclusions:

  • Hot liquid marbles are susceptible to rupture and increased friction due to thermal gradients and resulting liquid bridge formation.
  • Strategies such as increasing particle size, reducing liquid volatility, or using superhydrophobic substrates can mitigate these issues.
  • This research provides crucial insights for the application of hot liquid marbles in temperature-controlled microfluidic systems.