Interfacial Evaporation And Superheat Based On Localized Heating Of Plasmonic Nanoparticles

Plasmonic effect in noble nanoparticles has gain worldwide attention for several promising properties,like high photothermal efficiency,adjustable absorption band,enhancing local electromagnetic field.And a lot of research has found its application in fields like photothermal therapy,catalysis and solar harvesting system.Recently,there is research showing that by localized heating effect,plasmonic nanoparticles dispersed in water could efficiently convert liquid water into vapor.This could be utilized in water purification.However,these research realized localized heating by increasing nanoparticle concentration while waste of materials is another problem.In this paper,using laser as incident light,for the first time,I used a combination of pure absorbing particles and pure scattering particles to solve this problem and largely enhanced the evaporation rate.Plus,I tested effect of particle concentration and explained its mechanism by calculation.It is found that moderate mixing of scattering nanoparticles could give a large enhancement in evaporation rate while excessive scattering nanoparticles could lead to evaporation rate decreasing due to energy loss by back scattering.Then,by changing to a low boiling point solution,for the first time,I utilized plasmonic nanoparticles as heating source and had research on boiling phenomenon on interface.Through the self-assembly of nanoparticles,it is found that nano sized nucleation points need high superheat to start boiling.Our research provided new perspective and method in designing new type solar harvesting and boiling research system.