Development of hierarchical surface roughness on porous poly (vinylidene fluoride) membrane for membrane distillation process,Polymer Engineering and Science

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Development of hierarchical surface roughness on porous poly (vinylidene fluoride) membrane for membrane distillation process
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-06-07 , DOI: 10.1002/pen.25412
Sima Rabiei ₁ , Seyed Mahmoud Mousavi ₁ , Anthony H.J. Paterson ₂

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The surface hydrophobicity of a poly (vinylidene fluoride) membrane was increased through the phase separation of polycarbonate (PC) solution on the membrane surface. A variety of characterization techniques including surface contact angle measurement, scanning electron microscopy, liquid entry pressure measurement, atomic force microscopy, porosity measurement, pore size measurement, and attenuated total reflectance‐Fourier transform infrared spectroscopy were performed to investigate the membrane surface modification. According to the results, the formation of PC deposits on the membrane surface provided hierarchical structures consisting of micro and nanoscale roughness which enhanced the surface hydrophobicity. Direct contact membrane distillation (DCMD) experiments, in which an aqueous solution of sodium chloride (3.5 wt%) resembling the seawater was used as feed, were carried out to assess the performance of membranes. This surface modification technique led to the improved pore wetting resistance of the coated membrane in DCMD application. This novel method is believed to have a great potential to apply on a wide variety of membranes for MD application.

中文翻译：

膜蒸馏过程中多孔聚偏二氟乙烯膜表面分层粗糙度的研究

通过聚碳酸酯（PC）溶液在膜表面上的相分离，增加了聚偏二氟乙烯膜的表面疏水性。进行了多种表征技术，包括表面接触角测量，扫描电子显微镜，液体进入压力测量，原子力显微镜，孔隙率测量，孔径测量以及衰减全反射傅里叶变换红外光谱，以研究膜表面改性。根据结果，在膜表面上形成PC沉积物提供了由微米和纳米级粗糙度组成的分层结构，这增强了表面疏水性。直接接触膜蒸馏（DCMD）实验，其中使用氯化钠水溶液（3。将类似于海水的5wt％用作进料，以评估膜的性能。这种表面改性技术在DCMD应用中提高了涂层膜的抗孔润湿性。人们认为这种新方法具有很大的潜力，可用于多种MD膜。

更新日期：2020-06-07

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