pH-dependent water permeability switching and its memory in MoS2 membranes

Hu, Chenxia; Achari, A.; Rowe, P.N.; Xiao, Hongdi; Suran, Swathi; Li, Z.; Huang, Kun; Chi, Chenglong; Cherian, Christie Thomas; Sreepal, Vishnu; Bentley, Phillip; Pratt, Andrew; Zhang, Ning; Novoselov, Konstantin; Michaelides, Angelos; Nair, R. R.

doi:10.1038/s41586-023-05849-4

Cited by 32 publications

(25 citation statements)

References 35 publications

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“…One is direct pore/channel creation on a substrate using well-controlled etching methods, including electron-beam etching, ion-track etching, and electrochemical fabrication . The other is the bottom-up strategy to assemble sub-1 nm channels/membranes from carbon and supramolecular nanotubes, , angstrom-porous MOFs and COFs, ,, and 2D nanosheets. − Among them, MOFs, COFs, and nanosheet-assembled sub-nanofluidic channels/membranes showed outstanding gating performance, so this section mainly discusses responsive sub-nanofluidic channels built from MOFs, COFs and nanosheets.…”

Section: Fabrication Of Responsive Sub-nanofluidic Channelsmentioning

confidence: 99%

“…Chemical treatments with multivalent cations (e.g., Al 3+ ) were utilized after membrane assembly to maintain the sub-nanoscale structure . Because the materials possess intrinsic responsiveness, 2D nanosheet sub-nanofluidic channels show pH, voltage, and light responsiveness without further functionalization. MOF-based nanosheets, such as Cu-TCPP, were recently assembled into robust sub-nanofluidic channels using the same method …”

Section: Fabrication Of Responsive Sub-nanofluidic Channelsmentioning

confidence: 99%

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Enhanced Gating Effects in Responsive Sub-nanofluidic Ion Channels

et al. 2023

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Conspectus The smart regulation of ion flow in biological ion channels (BICs) is vital to life. In general, intelligent BICs possess three main functions: (i) to selectively transfer specific ions, (ii) to quickly conduct specific ions, and (iii) to responsively control the flow of ions. Since the early exploration of potassium (K+) and sodium (Na+) channels began in the 1950s, the gating behaviors of BICs have been investigated for more than 70 years. Taking the first reported voltage-gated ion transport process as an example, a gate, which acts as the voltage sensor in BICs, detects variation in the membrane voltage, triggering the opening and closing of the ion channels. A gating ratio (GR) can describe the gating effect of a BIC, GR = I Open/I Closed, where I Open and I Closed are measured ion currents of the channel at open and closed states, respectively. BICs usually have strong gating effects with an extraordinarily high gating ratio, which can be up to infinity for channels with zero-current closed states. Inspired by nature, artificial ion channels (AICs) have been constructed to control ion permeation intelligently. Since 2004, a wide range of AICs have been developed to regulate the flow of ions via external stimulation (i.e., light, voltage, pH, magnetic field, and temperature). These ion nanochannels, usually constructed with intrinsic or guest functionalities that are responsive to environmental simulation, drive the opening and closing of the channels. However, the gating performances of such nanoscale ion channels (i.e., gating ratios usually between 1 and 30) are far below those of BICs, due to the relatively larger nanopores in AICs, which cannot entirely block ion transport in the off states. Over the past decade, emerging advanced materials (i.e., 1D nanotubes, 2D nanosheets, and 1D-3D sub-nanoporous frameworks) with intrinsic sub-nanometer pores and stimuli-responsive properties have provided promising tools to fabricate responsive sub-nanofluidic channels with efficient gating performance. These AICs are remarkably comparable to their biological counterparts, because their more confined spaces enable a more effective closed state of the channels. Our team has developed a series of responsive sub-nanofluidic channels based on metal–organic frameworks, covalent organic frameworks, and 2D nanosheets. These sub-nanofluidic channels exhibit much higher on–off gating ratios than nanofluidic channels do, and the gating effects can be maintained over a wide range of ionic concentrations. Moreover, sub-nanofluidic channels also show stimuli-tunable ion selectivity and ion blockage effects. Therefore, this Account first summarizes recent progress in fabrication and functionalization methods for constructing artificial responsive sub-nanoscale ion channels and then compare the gating principles of sub-nanochannels and nanochannels, before discussing the unique gating effects of sub-nanofluidic channels (i.e., large ion blockage effect, high gating ratio, stimuli-tunable ion selectivity, and wide gatin...

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Section: Fabrication Of Responsive Sub-nanofluidic Channelsmentioning

confidence: 99%

Section: Fabrication Of Responsive Sub-nanofluidic Channelsmentioning

confidence: 99%

Enhanced Gating Effects in Responsive Sub-nanofluidic Ion Channels

et al. 2023

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“…Ion hydration and ionic ordering at charged water–solid interfaces play crucial roles in many physical, chemical, and biological processes, such as the stability of ion battery anode materials, 1 nanoparticle growth on surfaces, 2 dissolution of inorganic materials, 3 desalination of water 4 and ionic transport in ion channels. 5 The charged interfaces usually attract counterions dissolved in the water to maintain electric neutrality, leading to the formation of an electrical double layer (EDL). 6 The most popular model used to describe an EDL is the Gouy–Chapman–Stern (GCS) model, which consists of a Stern layer and a diffusion layer.…”

Section: Introductionmentioning

confidence: 99%

The effect of surface hydrophobicity and hydrophilicity on ion–ion interactions at water–solid interfaces

Guan,

Tian,

Song

et al. 2024

Faraday Discuss.

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“…Two-dimensional (2D) materials such as graphene, hexagonal boron nitride, and transition metal dichalcogenides have been attracting much interest owing to their various advantages including 2D quantum properties [1,2], membrane separation properties [3][4][5], and gas sensitivities [6,7]. In particular, 5 Present address: College of Mathematics and Physics, Inner Mongolia Minzu University, Tongliao 028000, People's Republic of China. * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Control of rotation angles of multilayer graphene on SiC (000 1‾ ) by substrate off-direction and angle

Sakakibara

Bao

Hayashi

et al. 2023

J. Phys.: Condens. Matter

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Graphene on SiC (000-1) tends to grow in multiple layers and does not have a single orientation relation with the SiC substrate. It has been considered impossible to control the rotation angle of multilayer graphene on SiC (000-1). In this study, we grew graphene on off-axis SiC substrates with various off angles from 0° to 8° and investigated their in-plane rotation and electronic structures systematically. As the off angle toward the [11-20]SiC direction increased, graphene rotated by 30° with respect to SiC became less dominant and instead, graphene rotated by 30 ± 2.5° appeared. We also found that the uniformity of the graphene rotation angle was relatively high on SiC substrates with a small off angle toward the [1-100]SiC direction. Our results suggest that the step-terrace structure defined by the substrate off-direction and angle plays an important role in the controllability of the rotation angle of graphene.

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pH-dependent water permeability switching and its memory in MoS2 membranes

Cited by 32 publications

References 35 publications

Enhanced Gating Effects in Responsive Sub-nanofluidic Ion Channels

Enhanced Gating Effects in Responsive Sub-nanofluidic Ion Channels

The effect of surface hydrophobicity and hydrophilicity on ion–ion interactions at water–solid interfaces

Control of rotation angles of multilayer graphene on SiC (000 1‾ ) by substrate off-direction and angle

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