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Nanofiber membranes by multi-jet electrospinning arranged as arc-array with sheath gas for electrodialysis applications
Materials & Design ( IF 8.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matdes.2020.108504
Gaofeng Zheng , Jiaxin Jiang , Xiang Wang , Wenwang Li , Juan Liu , Gang Fu , Liwei Lin

Abstract Multi-jet electrospinning arranged in an arc array with sheath gas has been developed for the high-efficiency production of nanofiber membranes. The arc array constrains the electric field interferences among multiple nozzles and the sheath gas in laminar flow overcomes the electric repulsive force among the jets. The stretching and focusing effect from the sheath gas reduces both the nanofiber diameter and the diameter range, which helps to realize the continuous stable multi-jet electrospinning to fabricate uniform nanofiber membranes. After the treatment of 98% concentrated sulfuric acid for the reactive exchange groups and a hot-pressing process, the membrane is then applicable to electrodialysis applications. Thanks to the net structure, there are many ion transmission passageways within the membrane, leading to the low membrane resistance and high ion transmission efficiency. Experimentally, the increase of membrane thickness results in the decrease of porosity, ion exchange capacity (IEC) and selective permeability and the increase in membrane resistance. The electrodialysis tests show good ion selection performance with a high desalinization ratio of NaCl solution.

中文翻译:

用于电渗析应用的多喷射电纺纳米纤维膜与鞘气排列成弧形阵列

摘要 为了高效生产纳米纤维膜,已开发出采用鞘气以弧形阵列排列的多喷射静电纺丝。电弧阵列抑制了多个喷嘴之间的电场干扰,层流中的鞘气克服了射流之间的电排斥力。鞘气的拉伸和聚焦作用减小了纳米纤维的直径和直径范围,有助于实现连续稳定的多喷射静电纺丝以制备均匀的纳米纤维膜。经98%浓硫酸处理活性交换基团和热压工艺后,该膜可用于电渗析应用。由于网状结构,膜内有许多离子传输通道,膜电阻低,离子传输效率高。实验上,膜厚度的增加导致孔隙率、离子交换容量(IEC)和选择性渗透率的降低以及膜电阻的增加。电渗析试验显示出良好的离子选择性能,NaCl 溶液脱盐率高。
更新日期:2020-04-01
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