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首页> 外文期刊>ACS applied materials & interfaces >Beneficial CNT Intermediate Layer for Membrane Fluorination toward Robust Superhydrophobicity and Wetting Resistance in Membrane Distillation
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Beneficial CNT Intermediate Layer for Membrane Fluorination toward Robust Superhydrophobicity and Wetting Resistance in Membrane Distillation

机译：有益的CNT中间层用于膜氟化朝向较强的超疏水性和膜蒸馏中的润湿性

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摘要

Robust membrane hydrophobicity is crucial in membrane distillation (MD) to produce clean water, yet challenged by wetting phenomenon. We herein proposed a robust superhydrophobization process, by making use of a carbon nanotube (CNT) intermediate layer over commercial hydrophobic membrane, indirectly grafting the low-surface-energy material 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS), with the achieved membrane denoted as PVDF-CNT-FAS, in systematic comparison with direct grafting FAS on alkalinized PVDF denoted as PVDF-OH-FAS. Superhydrophobicity with water contact angle of 180 degrees was easily achieved from initial hydrophilic interface for both two resultant membranes. Interestingly, the existence of a CNT intermediate layer significantly maintained the stable hydrophobicity in various harsh conditions and improved mechanical properties, at an expense of ca. 20% smaller pore size and extended membrane thickness than PVDF-OH-FAS. In the MD experiment, the PVDF-CNT-FAS exhibited no vapor flux sacrifice, giving constant flux with the control and doubled that for PVDF-OH-FAS. A mass-heat transfer modeling suggested no significant heat loss but facilitated vapor flux with the CNT layer, unlike the impeded transfer for the counterpart membrane. A superior wetting resistance against 0.4 mM SDS further confirmed the benefit of constructing the CNT intermediate layer, presumably because of its excellent slippery property. This study demonstrates the important role of the CNT intermediate layer toward robust superhydrophobic membrane, suggesting the interest of applying the functional nanomaterial for controllable interface design.
机译：鲁棒膜疏水性在膜蒸馏（MD）中至关重要，以产生清洁水，但通过润湿现象挑战。我们在本文中提出了一种稳健的超疏水化方法，通过在商业疏水膜上使用碳纳米管（CNT）中间层，间接接枝低表面 - 能量材料1H，1H，2H，2H-全氟二癸基氧基硅烷（FAS），实现用PVDF-OH-Fas的直接移植Fas表示为PVDF-CNT-Fas的膜，其表示为PVDF-OH-FAS的直接接枝FAS。对于两个所得膜的初始亲水界面，容易实现具有180度的水接触角的超疏水性。有趣的是，CNT中间层的存在显着地保持了各种苛刻条件下的稳定疏水性，并以牺牲CA为代价而改善的机械性能。孔径较小20％，薄膜厚度小于PVDF-OH-FAS。在MD实验中，PVDF-CNT-FAS没有表现出蒸汽助熔剂牺牲，使控制恒定的助焊剂并加倍PVDF-OH-Fas。与CNT层不同，质量传热建模表明没有显着的热量损失，但具有CNT层的蒸汽通量，与用于对应膜的电阻转移。对0.4mm SDS的较强的润湿性进一步证实了构建CNT中间层的益处，可能是因为其优异的滑湿性能。该研究表明CNT中间层朝向鲁棒超疏水膜的重要作用，表明施加功能纳米材料以进行可控界面设计的兴趣。

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  • 来源
    《ACS applied materials & interfaces》 |2020年第18期|共13页
  • 作者

    Wang Yuting; Han Minyuan; Liu Lang; Yao Jingmei; Han Le;

  • 作者单位

    Chongqing Univ Sch Environm &

    Ecol Minist Educ Key Lab Three Gorges Reservoir Reg Ecoenvironm Chongqing 400045 Peoples R China;

    Chongqing Univ Sch Environm &

    Ecol Minist Educ Key Lab Three Gorges Reservoir Reg Ecoenvironm Chongqing 400045 Peoples R China;

    Chongqing Univ Sch Environm &

    Ecol Minist Educ Key Lab Three Gorges Reservoir Reg Ecoenvironm Chongqing 400045 Peoples R China;

    Chongqing Univ Sch Environm &

    Ecol Minist Educ Key Lab Three Gorges Reservoir Reg Ecoenvironm Chongqing 400045 Peoples R China;

    Chongqing Univ Sch Environm &

    Ecol Minist Educ Key Lab Three Gorges Reservoir Reg Ecoenvironm Chongqing 400045 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    membrane distillation; (super) hydrophobicity; carbon nanotube; permeability; wetting;

    机译：膜蒸馏;（超级）疏水性;碳纳米管;渗透性;润湿;

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