Simultaneous Measurement of Surface Tension and Viscosity Using a Liquid Dynamics Sensor

Area of Science:

• Materials Science
• Fluid Dynamics
• Sensor Technology

Background:

• Measuring liquid surface tension and viscosity typically requires complex, multi-step processes with specialized equipment.
• Existing methods are often costly, space-intensive, and lack simultaneous property determination.
• A streamlined, single-step measurement approach is needed to simplify liquid characterization.

Purpose of the Study:

• To develop a novel liquid dynamic sensor for simultaneous measurement of surface tension and viscosity.
• To enable single-step liquid property determination, reducing complexity and cost.
• To validate the sensor's accuracy and generalization capability for unknown liquids.

Main Methods:

• Fabrication of a superhydrophobic sensor using laser-induced graphene on polydimethylsiloxane with three electrode pairs.
• Monitoring time-series resistance changes induced by liquid impact dynamics on the sensor.
• Utilizing an echo state network algorithm for simultaneous estimation of surface tension and viscosity.

Main Results:

• Time-series liquid dynamics on the sensor surface demonstrably varied with liquid surface tension and viscosity.
• The echo state network successfully estimated both surface tension and viscosity simultaneously.
• The system exhibited robust generalization, accurately predicting properties of previously unmeasured liquids.

Conclusions:

• The proposed superhydrophobic liquid dynamic sensor enables simultaneous and accurate measurement of surface tension and viscosity.
• This single-step method offers a streamlined, cost-effective alternative to traditional liquid characterization techniques.
• The sensor's reliable performance and generalization capability highlight its potential for diverse applications in fluid analysis.