碱式硫酸镁晶须复合SiO_(2)纳米粒子制备高/低黏附性超疏水涂层  

Fabrication of high and low adhesive superhydrophobic coatings with magnesium oxysulfate whiskers and SiO_(2)nanoparticles

作　　者：吴鹏 乃学瑛[1,2] 刘鑫 董亚萍[1,2] 李武 WU Peng;NAI Xueying;LIU Xin;DONG Yaping;LI Wu(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;Qinghai Technology Research and Development Center of Comprehensive Utilization of Salt Lake Resources,Xining 810008,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,西宁810008 [2]青海盐湖资源综合利用技术研究开发中心,西宁810008 [3]中国科学院大学,北京100049

出　　处：《复合材料学报》2023年第1期334-341,共8页Acta Materiae Compositae Sinica

基　　金：青海省科技厅项目(2019-ZJ-7029)。

摘　　要：超疏水材料因性能独特,应用前景广阔而被广泛关注。本文采用碱式硫酸镁晶须(MOSWs)与二氧化硅纳米粒子制备超疏水涂层,首先对MOSWs及50 nm、500 nm SiO_(2)进行表面改性以降低表面能,然后基于混料实验将三者按比例混合以构造表面粗糙度,以接触角、滚动角及平均粗糙度R_(a)为响应变量建立回归模型,分析了混合分量的形貌、尺寸与混合比例对响应变量的影响,并探讨了超疏水涂层微观结构对水滴黏附性的影响以及粗糙度与超疏水性能之间的关系。结果表明:MOSWs复合SiO_(2)纳米粒子可制备具有不同黏附性的超疏水涂层,单独使用MOSWs可制备高黏附性超疏水涂层,其接触角达152.59°,涂层水平倒置水滴不滴落;而MOSWs与50 nm SiO_(2)以相同质量分数混合,可制备低黏附性超疏水涂层,其接触角达163.25°,滚动角可趋近0°。所制备涂层的平均粗糙度R_(a)值位于5~10μm之间时,接触角较大,滚动角较小,超疏水性能较佳。Superhydrophobic materials have been received extensive attention due to their unique properties and wide applications.In this work,two kinds of superhydrophobic coatings were successfully fabricated with magnesium oxysulfate whiskers(MOSWs)and nano-silica.Firstly,surface modifications for MOSWs and nano-silica(with size of 50 nm and 500 nm)were carried out to reduce their surface energy.Then,surface roughness was constructed by mixing MOSWs and nano-silica based on a mixture design approach,which was studied using contact angle,sliding angle and average roughness(R_(a))as response variables to illustrate causality among morphology,size and mixing ratio.Furthermore,the adhesive property of superhydrophobic coatings to water droplets was illustrated.The influences of roughness on superhydrophobic properties were investigated in detail.Based on the obtained results,superhydrophobic coatings with different adhesive properties were fabricated.The results show that the high adhesive superhydrophobic coating can be obtained using MOSWs as the raw material,whose contact angle is about 152.59°,and water droplets do not drip when the coating is turned upside down.The low adhesive superhydrophobic coating can be prepared by mixing MOSWs and 50 nm silica with the same mass fraction,whose contact angle and sliding angle are about 163.25°and 0°,respectively.Importantly,the excellent properties can be obtained for the low adhesive coating,when the average roughness(R_(a))is between 5-10μm.

关 键 词：碱式硫酸镁晶须 超疏水 表面改性 混料实验 黏附性 

分 类 号：TB332[一般工业技术—材料科学与工程] O647.5[理学—物理化学]