碳纳米管薄膜基ZnO纳米针表面冷凝微滴自驱离特性

近年来,仿生冷凝微滴自驱离(CMDSP)功能表面引起了人们的广泛关注,这是一种在潮湿具有冷凝温度的条件下,表面自主凝结液滴并能够发生自去除的新型表面,与传统的由重力驱动的宏观水滴的脱落或弹跳的超疏水表面不同,这种新型表面可以通过聚结释放多余的表面能,使小型冷凝微滴在跳跃过程中自行移动,这种跳跃现象不需要其他的力,如重力...

Condensate Microdroplets Self-propelling Characteristics on the Surface of ZnO Nano-needles Based on Carbon Nanotube Film

Recently,the bionic condensed microdroplets self-propelling(CMDSP)functional surface has attracted widespread attention.It is a new type of surface that condenses droplets on its own and is capable of self-removal under humid conditions with condensing temperatures.Different from conventional superhydrophobic surfaces where the shedding or bouncing of macroscopic droplets is driven by gravity,this new type of surface can release excess surface energy through agglomeration,allowing small condensed micro-droplets to move on their own during the jumping process,which does not require other forces,such as gravity or shear.Presently,most researched surfaces with CMDSP functions use metal or semiconductor materials as substrates,and the preparation of CMDSP functions on flexible substrates is still in its infancy.The structure of densely arranged zinc oxide(ZnO)nanoneedle arrays grown in situ on flexible carbon nanotube films(CNTF)was studied,and the geometric dimensions of the nanostructures to achieve the best CMDSP characteristics was optimized.Experimental results show that reducing the spacing of the nanoneedles structure can reduce the diameter of the condensed microdroplets,increase the nucleation density of the condensed microdroplets,and increase the frequency of the condensed microdroplets'self-propelling.On the contrary,increasing the tip diameter and height of the nanoneedles can increase the droplet ejection diameter,which is not conducive to the realization of the CMDSP function.