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Magnetocontrollable droplet mobility on liquid crystal-infused porous surfaces

Nano Research 2023年第4期16卷 5098-5107页

作者： Yang Xu Yuxing Yao Weichen Deng Jen-Chun Fang Robert LDupont Meng Zhang SimonČopar UrošTkalec Xiaoguang Wang William G.Lowrie Department of Chemical and Biomolecular Engineering The Ohio State UniversityColumbusOH 43210USA Division of Chemistry and Chemical Engineering California Institute of TechnologyPasadenaCA 91125USA Department of Physics Faculty of Mathematics and PhysicsUniversity of Ljubljana1000 LjubljanaSlovenia Institute of Biophysics Faculty of MedicineUniversity of Ljubljana1000 LjubljanaSlovenia Department of Physics Faculty of Natural Sciences and MathematicsUniversity of Maribor2000 MariborSlovenia Department of Condensed Matter Physics Jožef Stefan Institute1000 LjubljanaSlovenia Sustainability Institute The Ohio State UniversityColumbusOH 43210USA

Magnetocontrollable droplet mobility on surfaces of both solids and simple fluids have been widely used in a wide range of ***,little is understood about the effect of the magnetic field on the wettability and mobility of droplets on structured ***,we report the manipulation of the dynamic behaviors of water droplets on a film of thermotropic liquid crystals(LCs).We find that the static wetting behavior and static friction of water droplets on a 4’-octyl-4-biphenylcarbonitrile(8CB)film strongly depend on the LC mesophases,and that a magnetic field caused no measurable change to these ***,we find that the droplet dynamics can be affected by a magnetic field as it slides on a nematic 8CB film,but not on isotropic 8CB,and is dependent on both the direction and strength of the magnetic *** measuring the dynamic friction of a droplet sliding on a nematic 8CB film,we find that a magnetic field alters the internal orientational ordering of the 8CB which in turn affects its *** support this interpretation with a scaling argument using the LC magnetic coherence length that includes(i)the elastic energy from the long-range orientational ordering of 8CB and(ii)the free energy from the interaction between 8CB and a magnetic ***,these results advance our understanding of droplet mobility on LC films and enable new designs for responsive surfaces that can manipulate the mobility of water droplets.

关键词： liquid crystals lubricated surfaces magnetic field wettability droplet mobility

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