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Unprecedentedly Low CO2 Transport through Vertically Aligned, Conical Silicon Nanotube Membranes.
Nano Letters ( IF 9.6 ) Pub Date : 2020-05-29 , DOI: 10.1021/acs.nanolett.0c00265 Ji Soo Roh 1 , Hyunhee Lee 1 , Tae Hoon Lee 1 , Hee Wook Yoon 1 , Tae Hwan Choi 1 , Si-Hyun Do 1 , Seung Yeon Yoo 1 , Benny D Freeman 2 , Taeseup Song 1 , Ungyu Paik 1 , Ho Bum Park 1
Nano Letters ( IF 9.6 ) Pub Date : 2020-05-29 , DOI: 10.1021/acs.nanolett.0c00265 Ji Soo Roh 1 , Hyunhee Lee 1 , Tae Hoon Lee 1 , Hee Wook Yoon 1 , Tae Hwan Choi 1 , Si-Hyun Do 1 , Seung Yeon Yoo 1 , Benny D Freeman 2 , Taeseup Song 1 , Ungyu Paik 1 , Ho Bum Park 1
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Nanotube membranes could show significantly enhanced permeance and selectivity for gas separations. Up until now, studies have primarily focused on applying carbon nanotubes to membranes to achieve ultrafast mass transport. Here, we report the first preparation of silicon nanotube (SiNT) membranes via a template-assisted method and investigate the gas transport behavior through these SiNT membranes using single- and mixed-gas permeation experiments. The SiNT membranes consist of conical cylinder-shaped nanotubes vertically aligned on a porous silicon wafer substrate. The diameter of the SiNT pore mouths are 10 and 30 nm, and the average inner diameter of the tube body is 80 nm. Interestingly, among the gases tested, we found an unprecedentedly low CO2 permeance through the SiNT membranes in single-gas permeation experiments, exceeding the theoretical Knudsen selectivity toward small gases/CO2 separation. This behavior was caused by the reduction of CO2 permeability through the blocking effect of CO2 adsorbed in the narrow pore channels of the SiNT cone regions, indicating that CO2 molecules have a high affinity to the native silicon oxide layer (∼2 nm) that is formed on the inner walls of SiNTs. SiNT membranes also exhibited enhanced gas permeance and water flux as compared to classic theoretical models and, as such, may prove useful as a new type of nanotube material for use in membrane applications.
中文翻译：
通过垂直排列的圆锥形硅纳米管膜实现前所未有的低二氧化碳传输。
纳米管膜可显示出显着增强的气体分离渗透性和选择性。到目前为止，研究主要集中在将碳纳米管应用于膜上以实现超快质量传输。在这里，我们报告通过模板辅助方法首次制备硅纳米管（SiNT）膜，并使用单一和混合气体渗透实验研究了通过这些SiNT膜的气体传输行为。SiNT膜由在多孔硅晶片基板上垂直排列的圆锥形圆柱状纳米管组成。SiNT孔的直径为10和30 nm，管体的平均内径为80 nm。有趣的是，在测试的气体中，我们发现了前所未有的低CO 2在单气体渗透实验中通过SiNT膜的渗透率超过了理论Knudsen对小气体/ CO 2分离的选择性。此行为是由于通过吸附在SiNT锥体区域的狭窄孔道中的CO 2的阻断作用而降低了CO 2的渗透性所致，这表明CO 2分子对天然氧化硅层具有高亲和力（〜2 nm）。它形成在SiNTs的内壁上。与经典的理论模型相比，SiNT膜还表现出增强的气体渗透性和水通量，因此，可证明它可用作用于膜应用的新型纳米管材料。
更新日期：2020-07-08
中文翻译：
通过垂直排列的圆锥形硅纳米管膜实现前所未有的低二氧化碳传输。
纳米管膜可显示出显着增强的气体分离渗透性和选择性。到目前为止，研究主要集中在将碳纳米管应用于膜上以实现超快质量传输。在这里，我们报告通过模板辅助方法首次制备硅纳米管（SiNT）膜，并使用单一和混合气体渗透实验研究了通过这些SiNT膜的气体传输行为。SiNT膜由在多孔硅晶片基板上垂直排列的圆锥形圆柱状纳米管组成。SiNT孔的直径为10和30 nm，管体的平均内径为80 nm。有趣的是，在测试的气体中，我们发现了前所未有的低CO 2在单气体渗透实验中通过SiNT膜的渗透率超过了理论Knudsen对小气体/ CO 2分离的选择性。此行为是由于通过吸附在SiNT锥体区域的狭窄孔道中的CO 2的阻断作用而降低了CO 2的渗透性所致，这表明CO 2分子对天然氧化硅层具有高亲和力（〜2 nm）。它形成在SiNTs的内壁上。与经典的理论模型相比，SiNT膜还表现出增强的气体渗透性和水通量，因此，可证明它可用作用于膜应用的新型纳米管材料。
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