title: Electrokinetic Energy Conversion in Self-Assembled 2D Nanofluidic Channels with Janus Nanobuilding Blocks.
abstract: Inspired by the microstructure of nacre, material design, and large-scale integration of artificial nanofluidic devices step into a completely new stage, termed 2D nanofluidics, in which mass and charge transportation are confined in the interstitial space between reconstructed 2D nanomaterials. However, all the existing 2D nanofluidic systems are reconstituted from homogeneous nanobuilding blocks. Herein, this paper reports the bottom-up construction of 2D nanofluidic materials with kaolinite-based Janus nanobuilding blocks, and demonstrates two types of electrokinetic energy conversion through the network of 2D nanochannels. Being different from previous 2D nanofluidic systems, two distinct types of sub-nanometer- and nanometer-wide fluidic channels of about 6.8 and 13.8 Å are identified in the reconstructed kaolinite membranes (RKM), showing prominent surface-governed ion transport behaviors and nearly perfect cation-selectivity. The RKMs exhibit superior capability in osmotic and hydraulic energy conversion, compared to graphene-based membranes. The mineral-based 2D nanofluidic system opens up a new avenue to self-assemble asymmetric 2D nanomaterials for energy, environmental, and healthcare applications.
authors.affiliation: School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, P. R. China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Cheng
authors.affiliation: School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China.
authors.forename: Wenxiao
authors.initials: W
authors.lastname: Geng
authors.affiliation: School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, P. R. China.
authors.forename: Qinfu
authors.initials: Q
authors.lastname: Liu
authors.affiliation: CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors.forename: Wei
authors.identifier: http://orcid.org/0000-0003-3127-2394
authors.initials: W
authors.lastname: Guo
authors.affiliation: CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
keywords: 2D materials; Janus materials; biomimetics; ion transport; nanofluidics