Dynamic hydrophobicity of superhydrophobic PTFE-SiO2 electrospun fibrous membranes
Dynamic hydrophobicity of superhydrophobic PTFE-SiO2 electrospun fibrous membranes
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超疏水PTFE-SiO2电纺纤维膜的动态疏水性
DOI：
10.1016/j.memsci.2020.118810
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发表时间：
2021-02
影响因子：
9.5
通讯作者：
er L.
中科院分区：
文献类型：
--
作者：
Zou Fangdong;Li Gen;Wang Xinhou;Yarin Alex;er L.
疏水性对防水透气纤维膜(WBFm)至关重要。静态疏水性通常用水突破所需的静水压力和水接触角(WCA)来评价WBFM的防水性能。在这里，我们表明，这种表征是不充分的，并与WBFMS的实际应用不一致，因为该小组以前的工作中发现了流体动力聚焦效应，并由WBFMS揭示。因此，应该评估动态而不是静态的润湿性，以判断在特定应用中WBFM是否真的可以被认为是防水的。在这里，我们报道了一种新的实验策略来评估由粗糙的PTFE-SiO_2电纺纤维组成的不同厚度的WBFM的动态疏水性。最终，成功地制备出具有良好的防水性能(渗透速度为3.376米，S−1)和良好的透气性[水蒸气透过率为11.68万公斤/(M2d)，其中d代表一天]的WBFM。对其持久的疏水性和自洁性能也进行了表征。此外，还推导出了考虑纤维微观形态的WBFM临界厚度的理论公式。因此，临界WBFM厚度与纤维的表面积有关。这一理论结果对合适厚度的WBFM的生产具有很大的指导意义。
Hydrophobicity is critical for waterproofed and breathable fibrous membranes (WBFMs). Static hydrophobicity characterized by hydrostatic pressure required for water breakthrough and/o water contact angle (WCA) are usually used to assess the waterproofness of WBFMs. Here we show that such characterization is insufficient and inconsistent with practical applications of WBFMs because of the hydrodynamic focusing effect discovered in the previous works of this group and revealed by WBFMs. Accordingly, the dynamic rather than static wettability should be evaluated to judge whether a WBFM can be really considered as waterproofed in a particular application. Herein, we report a novel experimental strategy to evaluate the dynamic hydrophobicity of WBFMs of different thicknesses comprised of rough PTFE-SiO2electrospun fibers. Finally, the WBFMs with robust waterproofness (penetration velocity of 3.376 m s−1) and excellent breathability [water vapor transmission rate of 11.68 kg/(m2d), where d stands for day] were successfully fabricated. Their durable hydrophobicity and self-cleaning performance were also characterized. In addition, a novel theoretical formula for the critical thickness of WBFMs accounting for the fiber micro-morphology was derived. Thus, the critical WBFM thickness is linked to the surface area of the fibers. This theoretical result holds great promise of guidance for the production of WBFMs with appropriate thickness.
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影响因子：
9.5
作者：
Saffarini, Rasha B.;Mansoor, Bilal;Arafat, Hassan A.
通讯作者：
Arafat, Hassan A.
影响因子：
2.5
作者：
Kang, Yun Kyung;Park, Chung Hee;Kang, Tae Jin
通讯作者：
Kang, Tae Jin
影响因子：
9.5
作者：
Tao Zhou;Yongyi Yao;Ruili Xiang;Yurong Wu
通讯作者：
Tao Zhou;Yongyi Yao;Ruili Xiang;Yurong Wu
具有超弹性和多功能性的超轻纳米纤维组装细胞气凝胶
影响因子：
16.6
作者：
Si, Yang;Yu, Jianyong;Ding, Bin
通讯作者：
Ding, Bin
DOI：
10.1103/physreve.83.036305
发表时间：
2011-03
期刊：
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子：
--
作者：
Christina M. Weickgenannt;Yiyun Zhang;A. Lembach;I. Roisman;T. Gambaryan-Roisman;A. Yarin;C. Tropea
通讯作者：
Christina M. Weickgenannt;Yiyun Zhang;A. Lembach;I. Roisman;T. Gambaryan-Roisman;A. Yarin;C. Tropea