Fast Permeation of Small Ions in Carbon Nanotubes

Advanced Science

Camille L. Bilodeau¹  Sei Jin Park²  Francesco Fornasiero²  Chiatai Chen²  Kuang Jen Wu²  Eric R. Meshot²  Melinda L. Jue²  Marissa Wood²  Fikret Aydin²  Edmond Y. Lau²  Tuan Anh Pham²  April M. Sawvel²  Steven F. Buchsbaum² 

[1] Howard P. Isermann Department of Chemical and Biological Engineering and Center for Biotechnology and Interdisciplinary Studies Rensselaer Polytechnic Institute Troy NY 12180 USA;Physical and Life Sciences Lawrence Livermore National Laboratory Livermore CA 94550 USA;

关键词: anomalous transport;    carbon nanotubes;    fast ion permeation;    flow enhancement;    nanofluidics;   

DOI  :  10.1002/advs.202001802

来源: DOAJ

【 摘 要 】

Abstract Simulations and experiments have revealed enormous transport rates through carbon nanotube (CNT) channels when a pressure gradient drives fluid flow, but comparatively little attention has been given to concentration‐driven transport despite its importance in many fields. Here, membranes are fabricated with a known number of single‐walled CNTs as fluid transport pathways to precisely quantify the diffusive flow through CNTs. Contrary to early experimental studies that assumed bulk or hindered diffusion, measurements in this work indicate that the permeability of small ions through single‐walled CNT channels is more than an order of magnitude higher than through the bulk. This flow enhancement scales with the ion free energy of transfer from bulk solutions to a nanoconfined, lower‐dielectric environment. Reported results suggest that CNT membranes can unlock dialysis processes with unprecedented efficiency.

【 授权许可】

Unknown