Droplet Transportation on Liquid-Infused Asymmetrically Structured Surfaces by Mechanical Oscillation and Viscosity...

Area of Science:

• Physics
• Engineering
• Materials Science

Background:

• Droplet transport on surfaces is crucial for microfluidics and biochemical analysis.
• Existing methods for droplet manipulation face limitations in control and precision.

Purpose of the Study:

• To develop a novel strategy for precise control of droplet motion on solid surfaces.
• To investigate the parameters influencing droplet transport velocity and manipulation capabilities.

Main Methods:

• Combining an asymmetric structure with infused lubricating oil on a vibrating substrate.
• Experimental realization of droplet transportation for volumes 10-90 μL.
• Theoretical analysis of droplet transport dynamics.

Main Results:

• Achieved droplet transportation with adjustable speeds from 1.45 to 10.87 mm/s.
• Demonstrated droplet transportation along extended trajectories.
• Successfully performed selective movement of multiple droplets.
• Identified the interplay of Ohnesorge number, droplet volume, and input amplitude in velocity control.

Conclusions:

• The proposed method offers effective control over liquid droplet motion.
• The findings provide insights into the complex physics governing droplet transport.
• This technique has potential for advanced applications in microfluidic and biochemical systems.