Fast mass transport through sub-2-nanometer carbon nanotubes
Fast mass transport through sub-2-nanometer carbon nanotubes
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DOI：
10.1126/science.1126298
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发表时间：
2006-05-19
期刊：
影响因子：
56.9
通讯作者：
Bakajin, O
中科院分区：
文献类型：
--
作者：
Holt, JK;Park, HG;Bakajin, O
我们报告的气体和水的流量测量通过微制造膜，其中对齐的直径小于2纳米的碳纳米管作为孔。测得的气体流量超过了努森扩散模型的预测超过一个数量级。测得的水流量超过连续流体动力学模型计算的值超过三个数量级，并与分子动力学模拟外推的流速相当。这些基于纳米管的膜的气体和水的渗透性比商业聚碳酸酯膜高几个数量级，尽管具有小一个数量级的孔径。这些膜使在密闭环境中的质量传输的基础研究，以及更节能的纳米级过滤。
We report gas and water flow measurements through microfabricated membranes in which aligned carbon nanotubes with diameters of less than 2 nanometers serve as pores. The measured gas flow exceeds predictions of the Knudsen diffusion model by more than an order of magnitude. The measured water flow exceeds values calculated from continuum hydrodynamics models by more than three orders of magnitude and is comparable to flow rates extrapolated from molecular dynamics simulations. The gas and water permeabilities of these nanotube-based membranes are several orders of magnitude higher than those of commercial polycarbonate membranes, despite having pore sizes an order of magnitude smaller. These membranes enable fundamental studies of mass transport in confined environments, as well as more energy-efficient nanoscale filtration.