Insight into Ion Transfer through the Sub‐Nanometer Channels in Zeolitic Imidazolate Frameworks

Jiang, Zeyu; Liu, Hailing; Ahmed, Saud Asif; Hanif, Sumaira; Ren, Shi‐Bin; Xu, Jing‐Juan; Chen, Hong‐Yuan; Xia, Xing‐Hua; Wang, Kang

doi:10.1002/anie.201701279

Cited by 71 publications

(64 citation statements)

References 21 publications

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“…[22] We have studied the ionic current rectification in highordered porous anodic alumina with pore size of 40 nm [23] and sub-nanometer channels in metal-organic framework. [24] In the present study, the formation of i-motif-GPS at the tip of a nanopipette enables us to study ionic flow through structural tunable nanopores. The ionic current measurement setup is schematically shown in Figure S8 (Supporting Information).…”

Section: Electrochemical and Sers Response Of The I-motif-gps Upon Vamentioning

confidence: 92%

A Multiparameter pH‐Sensitive Nanodevice Based on Plasmonic Nanopores

Liu

Jiang

Pang

et al. 2017

Adv Funct Materials

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With controllable mass transfer and special optical properties, plasmonic nanopores may be applied as a nanodevice and possibly create a new generation of single molecule detection technique based on plasmon-enhanced spectra. In the present study, gold nanoparticles self-assemble into a gold porous sphere (GPS) on the tip of a glass nanopipette with the help of i-motif DNA thiolated by both ends as linker molecules. The gaps among neighboring gold nanoparticles are considered as plasmonic nanopores. The size of the formed nanopores can be tuned by the folded-unfolded conformational change of i-motif DNA upon pH adjustment from 4.5 to 7.0. Based on its tunable structural property, the GPS shows reversible changes in ionic current, potential, and surface-enhanced Raman scattering signal. The GPS is further used to probe regional pH in single cells. The successful application of GPS in multiparameter pH probing and single cell analysis suggests that the new physical properties of the self-assembled plasmonic nanopores can be used for fabricating multiple types of nanodevices and nanosensors.

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Section: Electrochemical and Sers Response Of The I-motif-gps Upon Vamentioning

confidence: 92%

A Multiparameter pH‐Sensitive Nanodevice Based on Plasmonic Nanopores

Liu

Jiang

Pang

et al. 2017

Adv Funct Materials

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“…[1] In this case,i on current measurements across synthetic nanopores and/or nanochannels with surface charge have revealed several counterintuitive ion transfer phenomena, such as ion current rectification (ICR), negative differential resistance,o scillation, and hysteresis. [2] Among them, ICR behavior is the earliest reported and mostly studied. Rectification inversion is an unusual rectification behavior, by which the direction of rectification is inverted with changing the concentration of counterions.…”

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confidence: 99%

Chaotropic Monovalent Anion‐Induced Rectification Inversion at Nanopipettes Modified by Polyimidazolium Brushes

Zhang

Liu

et al. 2018

Angewandte Chemie

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An onintuitive observation of monovalent anioninduced ion current rectification inversion at polyimidazolium brush (PimB)-modified nanopipettes is presented. The rectification inversion degree is strongly dependent on the concentration and species of monovalent anions.F or chaotropic anions (for example,C lO 4 À ), the rectification inversion is easily observed at alow concentration (5 mm), while there is no rectification inversion observed for kosmotropic anions (Cl À ) even at ah igh concentration (1m). Moreover,a tt he specific concentration (for example,10mm), the variation of rectification ratio on the type of anions is ranged by Hofmeister series (Cl À ! NO 3 À > BF 4 À > ClO 4 À > PF 6 À > Tf 2 N À ). Estimation of the electrokinetic charge density (s ek )d emonstrates that rectification inversion originates from the charge inversion owingtothe over-adsorption of chaotropic monovalentanion. To qualitatively understand this phenomenon, aconcentrationdependent adsorption mechanism is proposed.

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“…For example, a water‐stable, polycrystalline UiO‐66 (Zr) MOF membrane was fabricated on alumina hollow fibers for water softening application . A crack‐free sub‐nanometer composite structure for the study of ion transport was constructed by in situ growth of ZIF‐90 [Zn(Imidazole‐2‐carboxaldehyde) 2 ] on the tip of a glass nanopipette . Our group recently reported ultrafast and selective alkali metal ion transport in a high‐quality ZIF‐8 [Zn(2‐methylimidazolate) 2 ] membrane with sub‐nanometer pores .…”

Section: Introductionmentioning

confidence: 99%

Efficient Gating of Ion Transport in Three‐Dimensional Metal–Organic Framework Sub‐Nanochannels with Confined Light‐Responsive Azobenzene Molecules

Qian

Zhang

et al. 2020

Angewandte Chemie

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1D nanochannels modified with responsive molecules are fabricated to replicate gating functionalities of biological ion channels, but gating effects are usually weak because small molecular gates cannot efficiently block the large channels in the closed states. Now, 3D metal–organic framework (MOF) sub‐nanochannels (SNCs) confined with azobenzene (AZO) molecules achieve efficient light‐gating functionalities. The 3D MOFSNCs consisting of a MOF UiO66 with ca. 9–12 Å cavities connected by ca. 6 Å triangular windows work as angstrom‐scale ion channels, while confined AZO within the MOF cavities function as light‐driven molecular gates to efficiently regulate the ion flux. The AZO‐MOFSNCs show good cyclic gating performance and high on–off ratios up to 17.8, an order of magnitude higher than ratios observed in conventional 1D AZO‐modified nanochannels (1.3–1.5). This work provides a strategy to develop highly efficient switchable ion channels based on 3D porous MOFs and small responsive molecules.

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Insight into Ion Transfer through the Sub‐Nanometer Channels in Zeolitic Imidazolate Frameworks

Cited by 71 publications

References 21 publications

A Multiparameter pH‐Sensitive Nanodevice Based on Plasmonic Nanopores

A Multiparameter pH‐Sensitive Nanodevice Based on Plasmonic Nanopores

Chaotropic Monovalent Anion‐Induced Rectification Inversion at Nanopipettes Modified by Polyimidazolium Brushes

Efficient Gating of Ion Transport in Three‐Dimensional Metal–Organic Framework Sub‐Nanochannels with Confined Light‐Responsive Azobenzene Molecules

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