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Underwater Mechanically Tough, Elastic, Superhydrophilic Cellulose Nanofiber-Based Aerogels for Water-in-Oil Emulsion Separation and Solar Steam Generation
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-08-24 , DOI: 10.1021/acsanm.1c01597 Zhu Wu 1 , Hongrui Sun 1 , Zhiguang Xu 2 , Huanjie Chi 1 , Xiaomin Li 1 , Shanchi Wang 1 , Tao Zhang 1 , Yan Zhao 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-08-24 , DOI: 10.1021/acsanm.1c01597 Zhu Wu 1 , Hongrui Sun 1 , Zhiguang Xu 2 , Huanjie Chi 1 , Xiaomin Li 1 , Shanchi Wang 1 , Tao Zhang 1 , Yan Zhao 1
Affiliation
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Cellulose nanofiber (CNF)-based aerogels are promising for various applications, but their poor water resistance and low underwater mechanical toughness hinder their applications. Here, we report the fabrication of covalent-cross-linked, CNF-based anisotropic aerogels through silane condensation and subsequent freeze-drying. The resulting aerogels show lamellar structures along the axial direction, enhanced hydrophilicity, excellent water resistance (soaked in water for 12 months without breakdown), and outstanding underwater mechanical toughness (without damage after 500 compression–release cycles). Also, the aerogels show an unusual underoil superhydrophilicity, which allows the aerogels to separate surfactant-stabilized water-in-oil emulsions through absorption with a high separation efficiency of 99.6%. Meanwhile, the excellent anti-oil-fouling ability endowed the aerogels with high recycle stability and reusability. Taking advantage of powerful antigravity water transportation (transfer rate of 3.75 mm/s at a height of 2.5 cm) imposed by the enhanced hydrophilicity and the interconnected radial-aligned channels, the aerogels were applied as structural components of the solar vapor generator, which showed a relatively high evaporation rate of 1.83 kg m–2 h–1 and water evaporation efficiency of 95.9% under one solar irradiation.
中文翻译：
用于油包水乳液分离和太阳能蒸汽产生的水下机械坚韧、弹性、超亲水纤维素纳米纤维基气凝胶
基于纤维素纳米纤维 (CNF) 的气凝胶在各种应用中很有前景，但它们的耐水性差和水下机械韧性低阻碍了它们的应用。在这里，我们报告了通过硅烷缩合和随后的冷冻干燥制备共价交联的、基于 CNF 的各向异性气凝胶。所得气凝胶沿轴向显示出层状结构、增强的亲水性、优异的耐水性（在水中浸泡 12 个月未破裂）和出色的水下机械韧性（在 500 次压缩-释放循环后无损坏）。此外，气凝胶显示出不寻常的油底超亲水性，这使得气凝胶能够通过吸收分离表面活性剂稳定的油包水乳液，分离效率高达 99.6%。同时，优异的抗油污能力使气凝胶具有较高的循环稳定性和可重复使用性。利用增强的亲水性和相互连接的径向排列通道施加的强大的反重力水传输（在 2.5 cm 高度的传输速率为 3.75 mm/s），气凝胶被用作太阳能蒸汽发生器的结构组件，这表明1.83 kg·m 的相对较高的蒸发率–2 h –1并且在一次太阳照射下水蒸发效率为 95.9%。
更新日期：2021-09-24
中文翻译：
用于油包水乳液分离和太阳能蒸汽产生的水下机械坚韧、弹性、超亲水纤维素纳米纤维基气凝胶
基于纤维素纳米纤维 (CNF) 的气凝胶在各种应用中很有前景，但它们的耐水性差和水下机械韧性低阻碍了它们的应用。在这里，我们报告了通过硅烷缩合和随后的冷冻干燥制备共价交联的、基于 CNF 的各向异性气凝胶。所得气凝胶沿轴向显示出层状结构、增强的亲水性、优异的耐水性（在水中浸泡 12 个月未破裂）和出色的水下机械韧性（在 500 次压缩-释放循环后无损坏）。此外，气凝胶显示出不寻常的油底超亲水性，这使得气凝胶能够通过吸收分离表面活性剂稳定的油包水乳液，分离效率高达 99.6%。同时，优异的抗油污能力使气凝胶具有较高的循环稳定性和可重复使用性。利用增强的亲水性和相互连接的径向排列通道施加的强大的反重力水传输（在 2.5 cm 高度的传输速率为 3.75 mm/s），气凝胶被用作太阳能蒸汽发生器的结构组件，这表明1.83 kg·m 的相对较高的蒸发率–2 h –1并且在一次太阳照射下水蒸发效率为 95.9%。
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