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Enhancing liquid-vapor phase behavior through multiscale anisotropic wettability gradient in dandelion-inspired
Jiayu Song1, Francis Eric P Almaquer1,2, Zixuan Xiong1
1Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China. kekyeung@ust.hk.
Materials Horizons
|June 20, 2025
Summary
Researchers developed dandelion-inspired nanostructures for advanced liquid-vapor phase control. These surfaces enable efficient condensation and heat transfer by allowing water to float, reducing thermal resistance.
Area of Science:
- Materials Science
- Nanotechnology
- Thermodynamics
Background:
- Effective manipulation of liquid-vapor phase behavior is crucial for energy efficiency.
- Controlling condensation is key for heat transfer applications.
Purpose of the Study:
- To develop a synthetic strategy for multiscale anisotropic wettability gradients.
- To achieve horizontal and vertical biphilicity using dandelion-inspired nanostructures.
- To investigate the impact of these surfaces on condensation behavior and heat transfer.
Main Methods:
- Assembly of dandelion-inspired nanostructures on various nanowire materials (silicon, zinc oxide, copper oxide).
- Fabrication of surfaces with micro-nano-nano hierarchical structures.
- Characterization of liquid-vapor phase transitions (jumping-droplet, dropwise, filmwise condensation).
Main Results:
- Achieved tunable horizontal and vertical biphilicity.
- Demonstrated stable Cassie state for condensate, allowing droplets/films to float.
- Identified ultrathin water films (<2 μm) reducing thermal resistance and promoting rapid condensate removal.
- Observed directed water nucleation and controlled flow due to surface hierarchy.
Conclusions:
- The novel biphilic surfaces optimize liquid-vapor phase behavior for enhanced heat transfer.
- The floating condensate and vapor channels significantly improve condensation efficiency.
- This approach offers transformative potential for energy efficiency and fluid management applications.
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