Impact of PEG additives and pore rim functionalization on water transport through sub-1 nm carbon nanotube porins,Faraday Discussions

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Impact of PEG additives and pore rim functionalization on water transport through sub-1 nm carbon nanotube porins
Faraday Discussions ( IF 3.3 ) Pub Date : 2018-04-20 , DOI: 10.1039/c8fd00068a
Ramya H. Tunuguntla _{1,

2,

3,

4} , Andrew Y. Hu _{1,

2,

3,

4} , Yuliang Zhang _{1,

2,

3,

4} , Aleksandr Noy _{1,

2,

3,

4,

5}

Affiliation

Carbon nanotubes represent one of the most interesting examples of a nanofluidic channel that combines extremely small diameters with atomically smooth walls and well-defined chemical functionalities at the pore entrance. In the past, sub-1 nm diameter carbon nanotube porins (CNTPs) embedded in a lipid membrane matrix demonstrated extremely high water permeabilities and strong ion selectivities. In this work, we explore additional factors that can influence transport in these channels. Specifically, we use stopped-flow transport measurements to focus on the effect of chemical modifications of the CNT rims and chaotropic polyethyleneglycol (PEG) additives on CNTP water permeability and Arrhenius activation energy barriers for water transport. We show that PEG, especially in its more chaotropic coiled configuration, enhances the water transport and reduces the associated activation energy. Removal of the static charges on the CNTP rim by converting –COOH groups to neutral methylamide groups also reduces the activation energy barriers and enhances water transport rates.

中文翻译：

PEG添加剂和孔沿功能化对水通过1 nm以下碳纳米管孔传输的影响

碳纳米管代表了纳米流体通道最有趣的例子之一，该通道将极小的直径与原子光滑的壁以及在孔口处定义明确的化学功能相结合。过去，嵌入脂质膜基质中的直径小于1 nm的碳纳米管孔（CNTP）表现出极高的水渗透性和强大的离子选择性。在这项工作中，我们探索了可能影响这些渠道中运输的其他因素。具体来说，我们使用止流传输测量来重点研究CNT边缘和离液型聚乙二醇（PEG）添加剂对CNTP透水性和Arrhenius活化能垒的化学修饰对水传输的影响。我们显示PEG，尤其是在其离液序列更高的螺旋结构中，增强了水的输送并降低了相关的活化能。通过将–COOH基团转化为中性甲酰胺基团来消除CNTP边缘上的静电荷，还可以减少活化能壁垒并提高水的传输速率。

更新日期：2018-09-28

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