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首页> 外文期刊>Separation and Purification Technology >A facile strategy to prepare superhydrophilic polyvinylidene fluoride (PVDF) based membranes and the thermodynamic mechanisms underlying the improved performance
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A facile strategy to prepare superhydrophilic polyvinylidene fluoride (PVDF) based membranes and the thermodynamic mechanisms underlying the improved performance

机译：一种制备超硫基聚偏二氟乙烯（PVDF）基膜的容易策略及其在改进性能下的热力学机制

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摘要

This study provided a first report on a facile strategy to fabricate superhydrophilic and low-fouling multilayer coatings on polyvinylidene fluoride (PVDF) membrane by layer-by-layer (LBL) assembly of Fe3+ and phytic acid (PA) alternately. Successful modification was verified by scanning electron microscope (SEM) observation and element analysis. It was found that, the resulted PA/Fe@PVDF-OH membrane with five bilayers' (BLs') modification performed the optimal antifouling properties under conditions in this study. As compared to the original PVDF-OH membrane, the coated membrane surface possessed super hydrophilicity (water contact angle was 11.34 degrees) and improved negative charge density. Thermodynamic analysis showed that, the changes of interaction energy caused by both of the modified surface thermodynamic properties and morphology were responsible for the improved antifouling performance of the coated membrane. The facile coating strategy, together with the method assessing interaction energy in this study provided a potential solution to optimize LBL assembly technique and to quantitatively tune antifouling ability of membranes.
机译：本研究提供了一种关于通过Fe3 +和植物（PA）的层 - 乙烯乙烯（PVDF）膜对聚偏二氟乙烯（PVDF）膜在聚偏二氟乙烯（PVDF）膜上制造过性和低结垢多层涂层的第一报告。通过扫描电子显微镜（SEM）观察和元素分析来验证成功的修改。发现，具有五个双层（BLS）改性的得到的PA / Fe @ PVDF-OH膜在本研究中的条件下进行了最佳的防污性能。与原始PVDF-OH膜相比，涂覆的膜表面具有超级亲水性（水接触角为11.34度），并提高负电荷密度。热力学分析表明，由改性表面热力学性质和形态学引起的相互作用能量的变化负责涂覆膜的改善的防污性能。相容涂层策略与评估本研究中的相互作用能量的方法提供了优化LBL组装技术的潜在解决方案和定量调节膜的防污能力。

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