Evaporation, Lifetime, and Robustness Studies of Liquid Marbles for Collision-Based Computing

Area of Science:

• Materials Science
• Microfluidics
• Surface Chemistry

Background:

• Liquid marbles (LMs) are emerging as versatile platforms for digital microfluidics and unconventional computing.
• Their application in these fields necessitates robust performance, including extended movement and collision survival.

Purpose of the Study:

• To evaluate the durability and lifetime of liquid marbles with different coating materials under operational stresses.
• To identify optimal coating materials for liquid marble applications requiring movement and impact resistance.

Main Methods:

• Investigated four coating types: polytetrafluoroethylene (PTFE), ultrahigh-density polyethylene (PE), nickel (Ni), and a Ni-PE composite.
• Assessed LM robustness through stationary and motion-based tests, including multiple impact scenarios and evaporative loss analysis.

Main Results:

• Pure PE LMs exhibited the longest survival rates under both stationary and motion conditions.
• PTFE LMs were least resilient to impacts, offering minimal protection against evaporation for small volumes.
• PE LMs demonstrated exceptional impact resistance and stability against passive evaporation.
• Ni-PE hybrid LMs showed improved impact resilience over pure Ni LMs.

Conclusions:

• Polyethylene (PE) emerges as a highly resilient coating material for liquid marbles, particularly for applications involving significant movement and impacts.
• The selection of appropriate coating materials, such as PE, is critical for designing robust and long-lasting liquid marble devices in microfluidics and computing.