摘要
Controlling the wetting and spreading of microdroplets is key to technologies such as microfluidics,ink-jet printing,and surface coating.Contact angle goniometry is commonly used to characterize surface wetting by droplets,but the technique is ill-suited for high contact angles close to 180°.Here,we attach a micrometric-sized droplet to an atomic force microscope cantilever to directly quantify droplet–solid friction on different surfaces(superhydrophobic and underwater superoleophobic)with sub-nanonewton force resolutions.We demonstrate the versatility of our approach by performing friction measurements using different liquids(water and oil droplets)and under different ambient environments(in air and underwater).Finally,we show that underwater superoleophobic surfaces can be qualitatively different from superhydrophobic surfaces:droplet–solid friction is highly sensitive to droplet speeds for the former but not for the latter surface.
出处
《Droplet》
EI
CAS
2024年第2期105-112,共8页
液滴（英文）
基金
support under the SERC Career Development Award(grant number A1820g0089,project number SC25/18-8R111)
support from the KAUST start-up fund(BAS/1/1416-01-01).V.J.acknowledges support from the Academy of Finland(341459).
