Preparation Of Epoxy Resin/inorganic Nanoparticles Composite Superwetting Surface

Wettability is an important property of solid surfaces,and lots of special wetting performance can be found in nature.A large number of superwetting materials have been researched and prepared,but some problems such as complex preparation methods,poor mechanical properties,expensive costs,and so on,are still difficult to be avoided.The development of low-cost,universal processes that are easy to be operated are still necessary.Moreover,the search of multiple functions and the realization of smart controllability are also highly desired.In this paper,given the low cost,good mechanical strength,low surface energy and special shape memory ability of the epoxy resin,it was used as a “glue”,and lots of new functional superwetting materials were designed and fabricated through combining functional inorganic nanoparticles.The specific research works are as follows:Preparation of epoxy resin/functional nanoparticle superhydrophobic composite surface.A certain amount of epoxy resin was firstly dropped on a glass slide,then inorganic nanoparticles were directly sprinkled on the epoxy layer.Due to capillary force,the viscous epoxy would combine the particles spontaneously to complete insitu hydrophobicity.After a further heating treatment,the super-hydrophobic composite surfaces with micro-nano rough structure can be obtained.The concentration of epoxy resin is crucial for the wettability and mechanical strength of the sample.It is found that the optimal value is about 36 mass%.The obtained surfaces exhibit superhydrophobic properties and meanwhile remarkable stability.Compared with previously reported PDMS/nanoparticles composite surfaces,our surface demonstrates a better mechanical stability.Finally,by using some particles with special functions such as noctilucence and magnetism,corresponding functional superhydrophobic surfaces were also displayed,proving the universality of the method.Preparation and research of underwater superoleophobic epoxy resin/Ti O₂ composite surface.An epoxy resin composite substrate with a microarray structure was prepared using a template method,and a simple ultrasonic surface coating of Ti O₂ nanoparticle was used to make an underwater superoleophobic composite surface.The amount of Ti O₂ nanoparticles is controlled by controlling the ultrasonic time.When the coating time is 5 min?10 min,the surface has underwater superoleophobic function.In addition,the shape of the surface microarray can be controlled by the shape memory effect,and the corresponding change of the wettability was also studied.When the microstructure collapses,the surface shows high adhesion,and when the microstructure recovers,the surface returns to the initial ultra-low adhesion state.As a result,intelligently regulating the adhesion between the oil droplets and the surface in the water phase can be achieved.Finally,the inner mechanism is analyzed.The state of the droplet on the microstructure surface is different as the surface microstructure is changed.It resides in the Cassie state and Wenzel State as the micropillars are in the upright and collapsed states,respectively,correspondingly,low and high oil adhesion can be observed.