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Jianyang Wu^1,2, Ingrid Snustad^1,3, Åsmund Ervik³

¹NTNU Nanomechanical Lab, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway.

|March 4, 2020

Summary

Nanoscale surface topography significantly influences CO2 droplet behavior on cold surfaces. Pillared surfaces enhance CO2-phobicity, crucial for improving CO2 capture efficiency via dropwise condensation.

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Area of Science:

Surface science
Nanotechnology
Chemical engineering

Background:

Dropwise condensation of carbon dioxide (CO2) on cold surfaces is a key technology for CO2 capture.
Understanding nanoscale surface features is vital for optimizing CO2 droplet wetting characteristics.
Current research lacks exploration into the impact of surface topography on CO2 droplet behavior.

Purpose of the Study:

To investigate the contact angle and wetting behaviors of CO2 droplets on pillar-structured surfaces.
To explore the influence of nanoscale surface topography on CO2 droplet condensation and capture.
To determine the transition from CO2-philic to CO2-phobic states on engineered surfaces.

Main Methods:

Large-scale molecular dynamics (MD) simulations were employed.
Simulations focused on CO2 droplets interacting with pillar-structured Cu-like surfaces.
Dynamic wetting simulations analyzed contact angles and spreading exponents.

Main Results:

Smooth surfaces showed a transition from CO2-philic to CO2-phobic with varying solid-liquid attraction.
Pillared surfaces resulted in higher contact angles and reduced spreading exponents for CO2 droplets.
CO2 droplets exhibited transitions between Cassie and Wenzel states based on surface parameters and CO2 affinity.

Conclusions:

Nanoscale surface structuring, specifically pillared designs, can effectively promote CO2-phobic surfaces.
Optimized surface topography is critical for enhancing the efficiency of dropwise condensation-based CO2 capture.
These findings provide insights for designing advanced materials for practical CO2 capture applications.