Hydrophilicity & Hydrophobicity And Application Of Three-Dimensional Patterned Micro/Nano Structure

The wetting and contact angle of the surfaces,as the important properties,are widespread attention by researchers.Superhydrophobic and superhydrophilic materials prepared by adjusting the contact angle of surfaces have been used in many fields,in other words,materials with special interfaces have gone deep into all aspects of human life.However,the interface material has a high production cost and it is not easy to modify.To prepare low-cost,simple-process and widely-use interface materials,we should explore the mechanism of interface control and improve the traditional manufacturing processes.In this paper,nanoimprinting technology is used to prepare microarray-structured polymer film(MSPF).Simultaneously we in-depth study of the patterning process.The main contents are described as follows.MSPF films with a contact angle of 161.5° were prepared on UV glue by UV-imprint and ETEF-MSPF films with a contact angle of 167.5°and a roll angle of 5°were prepared by hot pressing technique.After oxygen plasma treatment,the surface contact angle of MSPF dropped from 161.5° to 0° and its surface properties change from superhydrophobic to superhydrophilic.Micropillar arrays on the superhydrophilic films form capillary channels and its capillary action can pull the water flow to cover the surface quickly.At the same time,applying the PI(polyimide)mask combined with oxygen plasma treatment,we have achieved patterned superhydrophobic-superhydrophilic interphase film(PSSIF).Under capillary traction the water can flow along the hydrophilic area.Using inkjet-printing different layers of hydrophilic resin can be printed on MSPF.And by controlling the degree of coverage of the resin on the microarray structure we achieved the adjustment of contact angle between 161.5°-75 °.The superhydrophilic film based on the micro-pillar array is applied to the separation of graphene fragments of different sizes and the graphene fragments of several microns in size is successfully obtained.At the same time,using inkjet printing,microchannels with different widths are prepared on the film which demonstrates the PSSIF can be used in the microfluidic chip.Films with different microstructures and different interface properties are used to culture of 293T cells and by comparing the morphological differences of cells,hydrophilic 10?m-pillar membranes are suitable for the preparation of 3-D cell culture media.Through our work,a patterned hydrophobic-hydrophilic film with adjustable contact angle is prepared by nanoimprint and inkjet printing.The preparation process has been optimized and the applications in microparticle separation and 3-D cell culture are also explored.This kind of microstructure-based film material has a good prospect.