用于雾水收集应用的碳纳米管辊对辊连续反应生长

C Pub Date : 2024-01-09 DOI:10.3390/c10010009
Jean-Luc Meunier, Jeanne Ouellet, Kaustubh Basu, Alessio Aufoujal, Richard Boudreault, J. Tavares
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引用次数: 0

摘要

本文介绍了一种简单的方法,利用反应辊对辊(RR2R)配置在不锈钢表面稳定地连续生成碳纳米管林。碳纳米管林的生成不需要添加催化剂纳米颗粒;不锈钢基底本身就能产生催化生长位点。该工艺可使覆盖着碳纳米管林的超大表面上的单个碳纳米管根通过主键锚定到金属地面上。使用覆盖有碳纳米管的长导线对雾水收集进行了演示和测试,这是一种潜在的应用。与通常的基于 CNT 的 R2R 技术相反,RR2R 是在气相中进行的;没有使用 CNT 悬浮液的溶液处理。全部或部分 CNT 森林覆盖可调整表面疏水区和亲水区的比例和形状。这样就能优化雾水收集器,通过疏水性 CNT 林捕获水滴,并从亲水性 SS 表面去除水。在超声波产生的雾流下,使用带有 CNT 森林的小型竖琴式采水器进行的水回收测试产生了高达 2.2 g/cm2-h 的水捕获量。碳纳米管根部在不锈钢表面的牢固锚定为:(i) 复合结构的坚固性和易于运输;(ii) 结构的化学功能化和/或纳米粒子装饰提供了机会,并为包括雾气收集在内的一系列大规模表面应用开辟了道路。
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Continuous Reactive-Roll-to-Roll Growth of Carbon Nanotubes for Fog Water Harvesting Applications
A simple method is presented for the continuous generation of carbon nanotube forests stably anchored on stainless-steel surfaces using a reactive-roll-to-roll (RR2R) configuration. No addition of catalyst nanoparticles is required for the CNT-forest generation; the stainless-steel substrate itself is tuned to generate the catalytic growth sites. The process enables very large surfaces covered with CNT forests to have individual CNT roots anchored to the metallic ground through primary bonds. Fog water harvesting is demonstrated and tested as one potential application using long CNT-covered wires. The RR2R is performed in the gas phase; no solution processing of CNT suspensions is used, contrary to usual R2R CNT-based technologies. Full or partial CNT-forest coverage provides tuning of the ratio and shape of hydrophobic and hydrophilic zones on the surface. This enables the optimization of fog water harvesters for droplet capture through the hydrophobic CNT forest and water removal from the hydrophilic SS surface. Water recovery tests using small harp-type harvesters with CNT-forest generate water capture of up to 2.2 g/cm2·h under ultrasound-generated fog flow. The strong CNT root anchoring on the stainless-steel surfaces provides opportunities for (i) robustness and easy transport of the composite structure and (ii) chemical functionalization and/or nanoparticle decoration of the structures, and it opens the road for a series of applications on large-scale surfaces, including fog harvesting.
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