Study On Fabrication And Performances Of The Functional Superwetting Materials

Generally speaking,superhydrophobic surfaces are defined as surfaces with water contact angles higher than 150° and slide angle lower than 10°.While svperamphip hobic surfaces usually have contact angle higher than 150° for both water and oily liquids with low surface tension.Entering the 21st century,represented by superhydrophobic surface and superamphiphobic surface,the super-wetting surfaces play more and more important roles in the fields of corrosion resistance,ice protection,self-cleaning,antibacterial and oil-water separation,which has greatly promoted the field of development of materials.A large number of experimental studies'have shown that there are two key factors in the preparation of super-wetting surface,one is to construct a micro/nano-graded rough structure,and the other one is to modify the surface with materials which have low surface free energy.And both of the factors are indispensable.In recent years,the preparation technology of super-wetting materials has become increasingly mature,many super-wetting materials with various excellent properties have been successfully prepared.These super-wetting materials have exerted their own unique advantages in practical life and engineering applications.However,a large part of these materials are poor in durability and chemical stability.They are easily damaged by external stress in practical industrial and agricultural applications,which may cause irreversible damage to the surface micro/nano-graded rough structure.Worse,the special wettability of the materials will disappear.Therefore,in order to advance their applications in real life and production,it is of vital importance and value to prepare super-wetting materials with enhanced mechanical strength and chemical stability using the simple and cost-effective method.The purpose of this paper is to prepare the multi-functional super-wetting materials.In this paper,low-cost brucite and quartz sand particles are selected as the main raw materials.In addition,the surface modification is carried out by different low surface free energy modifiers The method that used is simple and easy to operate,and no special equipment is required here The main research contents of this paper are as follows(1)The multi-functional superhydrophobic recyclable materials were successfully fabricated by surface-functionalized brucite with organosilane on various substrates,such as glass,copper,fibers,sponge,common paper and filter paper.The obtained superhydrophobic materials exhibited water contact angles higer than 1500 and water sliding angles lower than 8o.The as-prepared superhydrophobic material exhibits excellent stability after a series of tests such as sandpaper abrasion,acid and alkali resistance,UV-irradiation resistance high/low temperature resistance,and self-cleaning.Based on the superhydrophobic-superoleophilic properties of the obtained materials,the oil-water mixture can be successfully separated by a simple oil-water separation device,and the separation efficiency was over 90%.More importantly,the superhydrophobic material can also be recycled for reuse,which is expected to reduce or even overcome the potential problems caused by low surface energy materials(2)The mechanmcally durable and multi-functional superamphiphobic coating which can be coated on different substrates is successfully prepared by employing quartz sand particles and organic silane via a simple drop coating method.The obtained coatings show high contact angle and low sliding angle to water and oils with low surface tension.The coatings can maintain their excellent omniphobic propertis after being subjected to long-distance sandpaper abrasion,56 hours of water droplet impact and 60 sand abrasion tests.Moreover,the coating showed durable superamphiphobicity toward strong acidic/alkali solutions,boiling water,UV irradiation and high/low temperature,which demonstrated the outstanding chemical and environmental stability.The as-fabricated coating also exhibited outstanding self-cleaning properties and low adhesion to water and oils.