3D printed polyamide membranes for desalination
3D printed polyamide membranes for desalination
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DOI：
10.1126/science.aar2122
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发表时间：
2018-08-17
期刊：
影响因子：
56.9
通讯作者：
McCutcheon, Jeffrey R.
中科院分区：
文献类型：
--
作者：
Chowdhury, Maqsud R.;Steffes, James;McCutcheon, Jeffrey R.
聚酰胺厚度和粗糙度已被确定为影响反渗透薄膜复合膜性能的关键属性。常规的形成方法缺乏以高分辨率或精度独立地控制这些性质的能力。提出了一种添加剂方法，该方法使用电喷雾将单体直接存款到基底上，在基底上单体反应形成聚酰胺。小液滴尺寸加上低单体浓度导致聚酰胺膜比常规聚酰胺更光滑和更薄，而该方法的添加剂性质允许控制厚度和粗糙度。聚酰胺膜形成为具有可控制的低至4纳米增量的厚度和低至2纳米的粗糙度，同时相对于商业基准膜仍表现出良好的选择透过性。
Polyamide thickness and roughness have been identified as critical properties that affect thin-film composite membrane performance for reverse osmosis. Conventional formation methodologies lack the ability to control these properties independently with high resolution or precision. An additive approach is presented that uses electrospraying to deposit monomers directly onto a substrate, where they react to form polyamide. The small droplet size coupled with low monomer concentrations result in polyamide films that are smoother and thinner than conventional polyamides, while the additive nature of the approach allows for control of thickness and roughness. Polyamide films are formed with a thickness that is controllable down to 4-nanometer increments and a roughness as low as 2 nanometers while still exhibiting good permselectivity relative to a commercial benchmarking membrane.