title: Electro- and magneto-modulated ion transport through graphene oxide membranes.
abstract: The control of ion trans-membrane transport through graphene oxide (GO) membranes is achieved by electric and magnetic fields. Electric field can either increase or decrease the ion transport through GO membranes depending on its direction, and magnetic field can enhance the ion penetration monotonically. When electric field is applied across GO membrane, excellent control of ion fluidic flows can be done. With the magnetic field, the effective anchoring of ions is demonstrated but the modulation of the ion flowing directions does not occur. The mechanism of the electro- and magneto-modulated ion trans-membrane transport is investigated, indicating that the electric fields dominate the ion migration process while the magnetic fields tune the structure of nanocapillaries within GO membranes. Results also show that the ion selectivity of GO membranes can be tuned with the electric fields while the transport of ions can be enhanced synchronously with the magnetic fields. These excellent properties make GO membranes promising in areas such as field-induced mass transport control and membrane separation.
authors.affiliation: School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, China.
authors.forename: Pengzhan
authors.initials: P
authors.lastname: Sun
authors.affiliation: School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zheng
authors.affiliation: School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, China.
authors.forename: Kunlin
authors.initials: K
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, China.
authors.forename: Minlin
authors.initials: M
authors.lastname: Zhong
authors.affiliation: Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Dehai
authors.initials: D
authors.lastname: Wu
authors.affiliation: 1] School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing 100084, China [2] Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Zhu