Influence of Transmembrane Ionic Current Based on PNIPAM-Modified Nanochannels

Liu, Mengfei; Zhang, Jinzheng; Qiao, Yujuan; Ye, Tingyan; Liu, Nannan; Xu, Xiangju; Zou, Chao; Huang, Shaoming

doi:10.1021/acs.jpcc.9b02152

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…Besides the above coating methods, researchers have also invented some other promising coating methods, such as silanization treatment, [76] self-assembled thiol monolayers, and [77][78] liquid lipid coatings. [79][80][81] electrostatic adsorption, [82] polymer modification after metal plating, [83] and electric-field induced self-assembly of polyelectrolytes, [84] atom transfer radical polymerization, [85][86] in situ polymerization, [87] and variety of grafting methods. [88][89][90][91] To demonstrate the practical impact of coating methods, Table 1 summarizes the characteristics of the main coating methods and the obtained nanopores.…”

Section: Chemical Modification Methodsmentioning

confidence: 99%

Solid‐state Nanopores: Chemical Modifications, Interactions, and Functionalities

Yang

et al. 2022

Chemistry An Asian Journal

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Nanopore technology is a burgeoning detection technology for single-molecular sensing and ion rectification. Solid-state nanopores have attracted more and more attention because of their higher stability and tunability than biological nanopores. However, solid-state nanopores still suffer the drawbacks of low signal-to-noise ratio and low resolution, which hinder their practical applications. Thus, developing operatical and useful methods to overcome the shortages of solid-state nanopores is urgently needed. Here, we summarize the recent research on nanopore modification to achieve this goal. Modifying solid-state nanopores with different coating molecules can improve the selectivity, sensitivity, and stability of nanopores. The modified molecules can introduce different functions into the nanopores, greatly expanding the applications of this novel detection technology. We hope that this review of nanopore modification will provide new ideas for this field.

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Section: Chemical Modification Methodsmentioning

confidence: 99%

Solid‐state Nanopores: Chemical Modifications, Interactions, and Functionalities

Yang

et al. 2022

Chemistry An Asian Journal

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“…And the initiator used in other group [27] was ethyl‐2‐bromoisobutyrate (EBiB). Li [28] and others [29] reported that the hydroxyl groups on the inner walls of the AAO nanopores were first modified with (3‐aminopropyl)trimethoxysilane (APTMS). The resulting ‐NH 2 groups were allowed to react with 2‐bromoisobutyryl bromide (BIBB), which endowed the AAO membrane with Br groups, capable of initiating the ATRP reaction of NIPAM.…”

Section: Modification Of Inorganic Nanoporementioning

confidence: 99%

Recent Advances in the Modification and Characterization of Solid‐State Nanopores

Lü

Cao

Qing

2022

Chemistry An Asian Journal

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Nanopores, due to their advantages of being modifiable, controllability and sensitivity, have made a splash in recent years in the fields of biomolecular sequencing, small molecule detection, salt differential power generation, and biomimetic ion channels. In these applications, the role of chemical or biological modification is indispensable. Compared with small molecules, the modification of polymers is more difficult and the methods are more diverse. Choosing an appropriate modification method directly determines the success or failure of a research project; therefore, it is necessary to summarize polymer modification methods toward nanopores. In addition, it is also important to provide clear and convincing evidence that the nanopore modification is successful, the corresponding characterization methods are also indispensable. Therefore, this review will summarize the methods of polymer modification of nanopores and efficient characterization methods. We hope that this review will provide some reference value for like-minded researchers.

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“…[17,18] For instance, thermoresponsive materials with critical solution temperatures can lead to steric and hydrophilic−hydrophobic effects at different temperatures, causing the increase of effective nanopore sizes for ion mobilities. [19][20][21] In terms of pH-responsive polymers, ion gating can also be demonstrated by pH-dependent structural transitions of soft matters. [22,23] Last but not least, versatile photoresponsive materials have been applied to ion channels for different physicochemical properties including ring-opening reactions and photoisomerization upon light irradiations.…”

Section: Introductionmentioning

confidence: 99%

Guard Cell‐Inspired Ion Channels: Harnessing the Photomechanical Effect via Supramolecular Assembly of Cross‐Linked Azobenzene/Polymers

Chen,

Hsieh,

Lin

et al. 2023

Small

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Stimuli‐responsive ion nanochannels have attracted considerable attention in various fields because of their remote controllability of ionic transportation. For photoresponsive ion nanochannels, however, achieving precise regulation of ion conductivity is still challenging, primarily due to the difficulty of programmable structural changes in confined environments. Moreover, the relationship between noncontact photo‐stimulation in nanoscale and light‐induced ion conductivity has not been well understood. In this work, a versatile design for fabricating guard cell‐inspired photoswitchable ion channels is presented by infiltrating azobenzene‐cross‐linked polymer (AAZO‐PDAC) into nanoporous anodic aluminum oxide (AAO) membranes. The azobenzene‐cross‐linked polymer is formed by azobenzene chromophore (AAZO)‐cross‐linked poly(diallyldimethylammonium chloride) (PDAC) with electrostatic interactions. Under UV irradiation, the trans‐AAZO isomerizes to the cis‐AAZO, causing the volume compression of the polymer network, whereas, in darkness, the cis‐AAZO reverts to the trans‐AAZO, leading to the recovery of the structure. Consequently, the resultant nanopore sizes can be manipulated by the photomechanical effect of the AAZO‐PDAC polymers. By adding ionic liquids, the ion conductivity of the light‐driven ion nanochannels can be controlled with good repeatability and fast responses (within seconds) in multiple cycles. The ion channels have promising potential in the applications of biomimetic materials, sensors, and biomedical sciences.

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Influence of Transmembrane Ionic Current Based on PNIPAM-Modified Nanochannels

Cited by 7 publications

References 33 publications

Solid‐state Nanopores: Chemical Modifications, Interactions, and Functionalities

Solid‐state Nanopores: Chemical Modifications, Interactions, and Functionalities

Recent Advances in the Modification and Characterization of Solid‐State Nanopores

Guard Cell‐Inspired Ion Channels: Harnessing the Photomechanical Effect via Supramolecular Assembly of Cross‐Linked Azobenzene/Polymers

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