Ultralight electrospun fiber foam with tunable lamellar macropores for efficient interfacial evaporation
Ultralight electrospun fiber foam with tunable lamellar macropores for efficient interfacial evaporation
复制标题
具有可调层状大孔的超轻电纺纤维泡沫，可实现高效的界面蒸发
DOI：
10.1016/j.jece.2022.107522
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发表时间：
2022
影响因子：
7.7
通讯作者：
Nosang V. Myung
中科院分区：
文献类型：
--
作者：
Tian Liang;Chengshuang Wang;Bo Li;Jinxing Chen;Zuyang Ye;Chunjie Yan;Huanwen Wang;Nosang V. Myung
太阳能驱动的界面蒸发被认为是解决全球水资源短缺这一关键问题的最有前途的技术之一。然而，在界面蒸发过程中，通过传导损失了大量的能量。为此，设计了一种含有微米级孤立气泡的自浮式Janus蒸发器，这种气泡可以增强热局部化。该蒸发器是由聚丙烯腈(PAN)纳米纤维发泡后沉积聚吡咯(PPy)合成的。蒸发器底部的亲水性PAN纳米纤维层具有丰富的大孔，可以通过毛细管力连续向上泵水。顶部的疏水PAN@PPy复合纳米纤维层具有宽带的太阳吸收性能，将太阳辐射高效地转化为热。微米级孤立气泡的低导热系数提高了聚丙烯腈泡沫塑料@PPy Janus蒸发器的隔热性能，而气泡对纳米纤维的拉伸和膨胀有助于提高其机械稳定性。这项工作提供了一种简单的制造蒸发器的方法，可以在阳光下从盐水中连续生产饮用水，并为提高传统的电纺基纤维支架的隔热性能和力学性能提供了新的思路。
Solar-driven interfacial evaporation is regarded as one of the most promising technologies to address the critical issue of global water scarcity. However, a great deal of energy is lost via conduction during the interfacial evaporation process. Herein, a self-floating Janus evaporator containing micron-sized isolated bubbles that can enhance heat localization is designed. The evaporator is synthesized by gas foaming polyacrylonitrile (PAN) nanofibers and subsequently depositing polypyrrole (PPy). The hydrophilic PAN nanofiber layer on the bottom of the evaporator with abundant macropores can continuously pump water upward through the capillary force. The hydrophobic PAN@PPy composite nanofiber layer on the top possesses a broadband solar absorption property, converting solar irradiation to heat efficiently. The low thermal conductivity of the isolated micron-sized bubbles enhances the thermal insulation of the obtained PAN foam@PPy Janus evaporator, while the stretching and expanding of the nanofibers induced by the bubbles contribute to its increased mechanical stability. This work offers a simple route to fabricate evaporators that can continuously produce drinking water from brine under sunlight, and provides a fresh idea to enhance the thermal insulation and mechanical properties of the conventional electrospinning-based fiber scaffold.