特殊浸润性表面的液滴凝结

The surfaces with micro/nano structures were fabricated by electrochemical corrosion and then boiling water treatment. Superhydrophobic surface was fabricated by chemical vapor deposition. Hydrophobic and hydrophilic surfaces were fabricated by coating surfaces with silicon oil and hydroxy-terminated silicon oil. Condensation on these surfaces (superhydrophilic, superhydrophobic, hydrophobic slippery and hydrophilic slippery) were investigated. Superhydrophilic surfaces show filmwise condensation. Both super hydrophobic and slippery surfaces show dropwise condensation. Superhydrophobic surfaces show out-of-plane jumping motion of the coalesced drops. Due to the wettability difference between the hydrophobic slippery surface and hydrophilic surface, fast droplet coalescence on hydrophilic slippery surfaces can effectively increase the droplet volume over time. The fog harvesting rates of different surfaces ranged in turn are hydrophilic slippery, hydrophobic slippery, superhydrophilic and superhydrophobic.