Plasmonic Photothermal Induced Phase Transition Of Water/Ice Droplet On PTFE Surface

The phase change of water droplets is a very common natural phenomenon,and the impact of phase change of water droplets is not all good,but also brings a variety of problems to daily life and production development,such as the material surface fog and ice accumulation,when water vapor condenses into liquid droplets on materials with excellent optical properties,such as prisms Lens,etc.,will not only affect the optical transparency of the material,but also affect the accuracy of the analytical instrument.When the surface of the material is frozen,for example,when the aircraft is flying at high altitude,it is very easy to freeze on the surface of the aircraft in the low temperature environment,which will not only increase the flight resistance of the aircraft,but may even lead to the occurrence of catastrophic events.So the material's surface water phase transformation is very meaningful,especially the study of material surface of fog and icing In recent years,the materials of field because of its no sustainable attention for its advantages such as no pollution,energy consumption by increasing the absorption of sunlight to improve the surface temperature of the material used to prevent mist of field and deicing deicing is a new way of thinking.Here,this paper shows a surface plasmons photothermal film with excellent heating effect,low cost,simple preparation,energy saving and environmental protection.It also has a good effect in anti-fogging,anti-icing and deicing.The photothermal film in this paper is prepared by mixing a very small amount of gold nanoparticles and titanium dioxide nanoparticles.Measured by an infrared camera,it was found that the surface temperature of the photothermal film increased by more than 25?under 3 sun(the optical power density was 300m W/cm~2).Among them,the super hydrophilic photothermal film can transform the misty water droplets formed by water vapor on the surface into a continuous thin water layer,which increases the contact area between the thin water layer and the photothermal film and reduces the light scattering of water droplets on the surface.At the same time,under the sunlight enters a membrane surface temperature will rise sharply,keep the surface temperature above the dew point,can not only inhibit water vapor condensation on the surface,also can make thin layer quickly evaporate,keep the surface drying Hydrophobic membrane of field can effectively reduce the contact area on the surface of the water droplets and material and adhesive force,have certain ability of inhibiting the icy surface.Moreover,under the photothermal effect of surface plasmons,high temperature can be generated locally,which increases the heat exchange between water droplets and the photothermal film surface.In low temperature environment,the local high temperature can inhibit surface water droplet nucleation ice melts the ice surface water droplets or,if not all melting,and also can melt membrane contact with ice water interface of field,reduce the adhesion of frozen water droplets on the material surface,and finally remove icing by other mechanical way,can achieve the goal of deicing.Finally,we explored the influence of the concentration of titanium dioxide nanoparticles on the heating effect of photothermal film surface through experimental methods and simulation methods.We found that the maximum temperature of the photothermal film under illumination was dependent on the concentration of titanium dioxide nanoparticles,and the experimental results were consistent with the theoretical results.In summary,the surface plasmon photothermal film prepared in this paper uses sunlight for anti-fogging,anti-icing and deicing,which has the advantages of simple preparation method and low production cost and has a wide range of potential application prospects.