Time-Dependent Liquid Transport on a Biomimetic Topological Surface

Area of Science:

• Biomimetics and Surface Science
• Fluid Dynamics
• Plant Biology

Background:

• Liquid drop impact on surfaces is common, with water behavior varying based on surface wettability (hydrophilic vs. hydrophobic).
• Plant leaves utilize surface properties to manage rainwater, demonstrating natural strategies for liquid drainage.
• The pitcher rim of Nepenthes alata exhibits unique hydrophilic properties affecting liquid behavior.

Purpose of the Study:

• To investigate the unusual liquid spreading phenomenon on the hydrophilic pitcher rim of Nepenthes alata.
• To develop biomimetic surfaces that mimic the peristome structure for controlled liquid transport.
• To explore applications of switchable liquid transport in industrial processes.

Main Methods:

• Mimicking the peristome surface using 3D printing and replication techniques.
• Investigating time-dependent liquid transport on biomimetic topological structures.
• Analyzing the synergistic effects of surface curvature and microtextures on liquid spreading.

Main Results:

• Demonstrated a phenomenon where impacting drops spread outward on hydrophilic surfaces, preventing liquid from filling a target area.
• Developed a large-scaled peristome-mimetic surface with switchable liquid transport capabilities.
• Showcased the ability of these surfaces to manage liquid drops on curved surfaces.

Conclusions:

• Surface curvature and microtextures can be synergistically manipulated to control liquid spreading.
• Biomimetic surfaces inspired by Nepenthes alata can effectively manage liquid drop impacts.
• This technology has potential applications in food processing, moisture transfer, and heat management.