Abstract
The interaction force is very important in the study of the contact process of droplets and super-hydrophobic substrates. Accurate interaction force measurement in the air has far-reaching impact on industrial production and biomimetic field. However, limited by the evaporation of small droplets, interaction force can only be measured in the liquid by AFM and other devices. A millimetric cantilever was used to make it possible to measure the interaction between droplets and super-hydrophobic substrates in the air. The optical lever was calibrated with the electrostatic force. The super- hydrophobic substrates were fabricated using nano particles and copper grids. We finally acquired the interaction force and wetting time between the droplet and super- hydrophobic substrates with different grid fractions and similar contact angle. The results showed that the interaction force decreased with the increase of the grid fraction. These would open a new way of understanding the mechanism of hydrophobic.
Highlights
Contact between droplets and hydrophobic surfaces occurs extensively in nature, such as the collision of chitin shells of many insects with droplets,[1] and the contact of the rainwater with the surfaces of plant foliage.[2]
The contact between the droplets and the hydrophobic surface exists in many processes such as washing and coating
It is of great significance to study the contact process between droplet and substrate to improve industrial productivity and bionics research.[3,4,5,6,7]
Summary
Contact between droplets and hydrophobic surfaces occurs extensively in nature, such as the collision of chitin shells of many insects with droplets,[1] and the contact of the rainwater with the surfaces of plant foliage.[2] In the industrial production, the contact between the droplets and the hydrophobic surface exists in many processes such as washing and coating. It is of great significance to study the contact process between droplet and substrate to improve industrial productivity and bionics research.[3,4,5,6,7]. Eddi experimentally studied the initial spreading dynamics of viscous drops and found that the spreading velocity decreased logarithmically in time.[10] James C. Paulsen used an electrical method to measure and observe drop coalescence.[12]
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