Turkoglu Sevil, Zhang Jinde, Dodiuk Hanna, Kenig Samuel, Ratto Jo Ann, Mead Joey
Plastics Engineering Department, University of Massachusetts Lowell, Lowell, MA 01854, USA.
Department of Polymer Materials Engineering, Shenkar College, Ramat Gan 5252626, Israel.
Polymers (Basel). 2023 Feb 28;15(5):1242. doi: 10.3390/polym15051242.
Superhydrophilic coatings based on a hydrophilic silica nanoparticle suspension and Poly (acrylic acid) (PAA) were prepared by dip coating. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) were used to examine the morphology of the coating. The effect of surface morphology on the dynamic wetting behavior of the superhydrophilic coatings was studied by changing the silica suspension concentration from 0.5% wt. to 3.2% wt. while keeping the silica concentration in the dry coating constant. The droplet base diameter and dynamic contact angle with respect to time were measured using a high-speed camera. A power law was found to describe the relationship between the droplet diameter and time. A significantly low experimental power law index was obtained for all the coatings. Both roughness and volume loss during spreading were suggested to be responsible for the low index values. The water adsorption of the coatings was found to be the reason for the volume loss during spreading. The coatings exhibited good adherence to the substrates and retention of hydrophilic properties under mild abrasion.
通过浸涂法制备了基于亲水性二氧化硅纳米颗粒悬浮液和聚丙烯酸（PAA）的超亲水涂层。利用扫描电子显微镜（SEM）和原子力显微镜（AFM）研究了涂层的形态。在保持干涂层中二氧化硅浓度不变的情况下，将二氧化硅悬浮液浓度从0.5% wt. 改变到3.2% wt.，研究了表面形态对超亲水涂层动态润湿行为的影响。使用高速相机测量液滴基部直径和相对于时间的动态接触角。发现幂律可以描述液滴直径与时间之间的关系。所有涂层的实验幂律指数都显著较低。粗糙度和铺展过程中的体积损失都被认为是导致低指数值的原因。发现涂层的吸水性是铺展过程中体积损失的原因。涂层对基材表现出良好的附着力，并且在轻度磨损下保持亲水性。
