Tunable Surface Wettability via Terahertz Electrowave Controlled Vicinal Subnanoscale Water Layer

Area of Science:

• Surface Science
• Physical Chemistry
• Materials Science

Background:

• Remote control of surface wettability is crucial for applications like nanofluidics and drug delivery.
• Existing methods lack timely, reversible, and long-range tunability.

Purpose of the Study:

• To theoretically design an electrowetting system for remote surface wettability control using terahertz waves.
• To investigate the underlying mechanism of terahertz-induced wettability changes.

Main Methods:

• Molecular dynamic simulations were employed to model the interaction of terahertz waves with water layers on surfaces.
• Analysis focused on the unique collective vibrations in subnanoscale water layers.

Main Results:

• A novel electrowetting mechanism utilizing terahertz waves was theoretically designed.
• The study identified unique terahertz collective vibrations in subnanoscale water layers, enabling efficient energy transfer.
• A frequency-specific terahertz electric field was shown to tune the hydrogen-bonding network and surface wettability.

Conclusions:

• Terahertz wave-induced electrowetting offers a promising approach for achieving remote, tunable surface wettability.
• The findings open new avenues for advanced applications in nanofluidics, drug delivery, and catalysis.