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Ion transport in complex layered graphene-based membranes with tuneable interlayer spacing

Science advances, 2016-02, Vol.2 (2), p.e1501272-e1501272 [Peer Reviewed Journal]

Copyright © 2016, The Authors 2016 The Authors ;ISSN: 2375-2548 ;EISSN: 2375-2548 ;DOI: 10.1126/sciadv.1501272 ;PMID: 26933689

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  • Title:
    Ion transport in complex layered graphene-based membranes with tuneable interlayer spacing
  • Author: Cheng, Chi ; Jiang, Gengping ; Garvey, Christopher J ; Wang, Yuanyuan ; Simon, George P ; Liu, Jefferson Z ; Li, Dan
  • Subjects: Nanotechnology ; SciAdv r-articles
  • Is Part Of: Science advances, 2016-02, Vol.2 (2), p.e1501272-e1501272
  • Description: Investigation of the transport properties of ions confined in nanoporous carbon is generally difficult because of the stochastic nature and distribution of multiscale complex and imperfect pore structures within the bulk material. We demonstrate a combined approach of experiment and simulation to describe the structure of complex layered graphene-based membranes, which allows their use as a unique porous platform to gain unprecedented insights into nanoconfined transport phenomena across the entire sub-10-nm scales. By correlation of experimental results with simulation of concentration-driven ion diffusion through the cascading layered graphene structure with sub-10-nm tuneable interlayer spacing, we are able to construct a robust, representative structural model that allows the establishment of a quantitative relationship among the nanoconfined ion transport properties in relation to the complex nanoporous structure of the layered membrane. This correlation reveals the remarkable effect of the structural imperfections of the membranes on ion transport and particularly the scaling behaviors of both diffusive and electrokinetic ion transport in graphene-based cascading nanochannels as a function of channel size from 10 nm down to subnanometer. Our analysis shows that the range of ion transport effects previously observed in simple one-dimensional nanofluidic systems will translate themselves into bulk, complex nanoslit porous systems in a very different manner, and the complex cascading porous circuities can enable new transport phenomena that are unattainable in simple fluidic systems.
  • Publisher: United States: American Association for the Advancement of Science
  • Language: English
  • Identifier: ISSN: 2375-2548
    EISSN: 2375-2548
    DOI: 10.1126/sciadv.1501272
    PMID: 26933689
  • Source: Open Access: DOAJ Directory of Open Access Journals
    Open Access: PubMed Central
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