The Experts below are selected from a list of 4434 Experts worldwide ranked by ideXlab platform
Lei Jiang - One of the best experts on this subject based on the ideXlab platform.
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large scale robust mushroom shaped Nanochannel array membrane for ultrahigh osmotic energy conversion
Science Advances, 2021Co-Authors: Liping Wen, Lei Jiang, Xin Sui, Longcheng Gao, Yiren ChengAbstract:The osmotic energy, a large-scale clean energy source, can be converted to electricity directly by ion-selective membranes. None of the previously reported membranes meets all the crucial demands of ultrahigh power density, excellent mechanical stability, and upscaled fabrication. Here, we demonstrate a large-scale, robust mushroom-shaped (with stem and cap) Nanochannel array membrane with an ultrathin selective layer and ultrahigh pore density, generating the power density up to 22.4 W·m−2 at a 500-fold salinity gradient, which is the highest value among those of upscaled membranes. The stem parts are a negative-charged one-dimensional (1D) Nanochannel array with a density of ~1011 cm−2, deriving from a block copolymer self-assembly; while the cap parts, as the selective layer, are formed by chemically grafted single-molecule–layer hyperbranched polyethyleneimine equivalent to tens of 1D Nanochannels per stem. The membrane design strategy provides a promising approach for large-scale osmotic energy conversion.
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free standing covalent organic framework membrane for high efficiency salinity gradient energy conversion
Angewandte Chemie, 2021Co-Authors: Shuhua Hou, Liping Wen, Yunfei Teng, Jianjun Chen, Lei JiangAbstract:Both high ionic conductivity and selectivity of a membrane are required for efficient salinity gradient energy conversion. An efficient method to improve energy conversion is to align ionic transport along the membrane thickness to address low ionic conductivity in traditional membranes used for energy harvesting. Here, we fabricate a free-standing covalent organic frameworks membrane (TpPa-SO 3 H) with excellent stability and mechanical properties. This membrane with one-dimensional Nanochannels and high charge density demonstrates high ionic conductivity and selectivity. Its power density can reach up to 5.9 W/m 2 by mixing artificial seawater and river water. Based on our results, we propose that the high energy conversion is attributed to the high ion conductivity through aligned one-dimensional Nanochannels and high ion selectivity via the size of the Nanochannel at ~1 nm in the membrane. This study paves the way for designing covalent organic framework membranes for high salinity gradient energy conversion.
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robust sulfonated poly ether ether ketone Nanochannels for high performance osmotic energy conversion
National Science Review, 2020Co-Authors: Yuanyuan Zhao, Lei Jiang, Yongchao Qian, Xiang-yu Kong, Jinhui Pang, Jin Wang, Weiwen Xin, Teng Zhou, Linsen Yang, Liping WenAbstract:The membrane-based reverse electrodialysis (RED) technique has a fundamental role in harvesting clean and sustainable osmotic energy existing in the salinity gradient. However, the current designs of membranes cannot cope with the high output power density and robustness. Here, we construct a sulfonated poly (ether ether ketone) (SPEEK) Nanochannel membrane with numerous Nanochannels for a membrane-based osmotic power generator. The parallel Nanochannels with high space charges show excellent cation-selectivity, which could further be improved by adjusting the length and charge density of Nanochannels. Based on numerical simulation, the system with space charge shows better conductivity and selectivity than those of a surface-charged Nanochannel. The output power density of our proposed membrane-based device reaches up to 5.8 W/m2 by mixing artificial seawater and river water. Additionally, the SPEEK membranes exhibit good mechanical properties, endowing the possibility of creating a high-endurance scale-up membrane-based generator system. We believe that this work provides useful insights into material design and fluid transport for the power generator in osmotic energy conversion.
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correction bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion transport regulation
Chemical Communications, 2020Co-Authors: Congcong Zhu, Lei Jiang, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Liping WenAbstract:Biological ion channel-based mass transport and signal transduction play a crucial role in physiological activities, and biomimetic Nanochannels in aqueous solutions for ion transport regulation have been extensively studied. Few studies on non-aqueous systems, gel-based Nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion transport in Nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic Nanochannel system by employing the agarose hydrogel in conical Nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion transport behavior in gel-based Nanochannels is systemically investigated. The experimental results show that the ion transport behaviors in gel-Nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.
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bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion transport regulation
Chemical Communications, 2020Co-Authors: Yunfei Teng, Yongchao Qian, Weipeng Chen, Xiang-yu Kong, Pei Li, Lei JiangAbstract:Biological ion channel-based mass transport and signal transduction play a crucial role in physiological activities, and biomimetic Nanochannels in aqueous solutions for ion transport regulation have been extensively studied. Few studies on non-aqueous systems, gel-based Nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion transport in Nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic Nanochannel system by employing the agarose hydrogel in conical Nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion transport behavior in gel-based Nanochannels is systemically investigated. The experimental results show that the ion transport behaviors in gel-Nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.
Liping Wen - One of the best experts on this subject based on the ideXlab platform.
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large scale robust mushroom shaped Nanochannel array membrane for ultrahigh osmotic energy conversion
Science Advances, 2021Co-Authors: Liping Wen, Lei Jiang, Xin Sui, Longcheng Gao, Yiren ChengAbstract:The osmotic energy, a large-scale clean energy source, can be converted to electricity directly by ion-selective membranes. None of the previously reported membranes meets all the crucial demands of ultrahigh power density, excellent mechanical stability, and upscaled fabrication. Here, we demonstrate a large-scale, robust mushroom-shaped (with stem and cap) Nanochannel array membrane with an ultrathin selective layer and ultrahigh pore density, generating the power density up to 22.4 W·m−2 at a 500-fold salinity gradient, which is the highest value among those of upscaled membranes. The stem parts are a negative-charged one-dimensional (1D) Nanochannel array with a density of ~1011 cm−2, deriving from a block copolymer self-assembly; while the cap parts, as the selective layer, are formed by chemically grafted single-molecule–layer hyperbranched polyethyleneimine equivalent to tens of 1D Nanochannels per stem. The membrane design strategy provides a promising approach for large-scale osmotic energy conversion.
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free standing covalent organic framework membrane for high efficiency salinity gradient energy conversion
Angewandte Chemie, 2021Co-Authors: Shuhua Hou, Liping Wen, Yunfei Teng, Jianjun Chen, Lei JiangAbstract:Both high ionic conductivity and selectivity of a membrane are required for efficient salinity gradient energy conversion. An efficient method to improve energy conversion is to align ionic transport along the membrane thickness to address low ionic conductivity in traditional membranes used for energy harvesting. Here, we fabricate a free-standing covalent organic frameworks membrane (TpPa-SO 3 H) with excellent stability and mechanical properties. This membrane with one-dimensional Nanochannels and high charge density demonstrates high ionic conductivity and selectivity. Its power density can reach up to 5.9 W/m 2 by mixing artificial seawater and river water. Based on our results, we propose that the high energy conversion is attributed to the high ion conductivity through aligned one-dimensional Nanochannels and high ion selectivity via the size of the Nanochannel at ~1 nm in the membrane. This study paves the way for designing covalent organic framework membranes for high salinity gradient energy conversion.
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robust sulfonated poly ether ether ketone Nanochannels for high performance osmotic energy conversion
National Science Review, 2020Co-Authors: Yuanyuan Zhao, Lei Jiang, Yongchao Qian, Xiang-yu Kong, Jinhui Pang, Jin Wang, Weiwen Xin, Teng Zhou, Linsen Yang, Liping WenAbstract:The membrane-based reverse electrodialysis (RED) technique has a fundamental role in harvesting clean and sustainable osmotic energy existing in the salinity gradient. However, the current designs of membranes cannot cope with the high output power density and robustness. Here, we construct a sulfonated poly (ether ether ketone) (SPEEK) Nanochannel membrane with numerous Nanochannels for a membrane-based osmotic power generator. The parallel Nanochannels with high space charges show excellent cation-selectivity, which could further be improved by adjusting the length and charge density of Nanochannels. Based on numerical simulation, the system with space charge shows better conductivity and selectivity than those of a surface-charged Nanochannel. The output power density of our proposed membrane-based device reaches up to 5.8 W/m2 by mixing artificial seawater and river water. Additionally, the SPEEK membranes exhibit good mechanical properties, endowing the possibility of creating a high-endurance scale-up membrane-based generator system. We believe that this work provides useful insights into material design and fluid transport for the power generator in osmotic energy conversion.
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correction bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion transport regulation
Chemical Communications, 2020Co-Authors: Congcong Zhu, Lei Jiang, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Liping WenAbstract:Biological ion channel-based mass transport and signal transduction play a crucial role in physiological activities, and biomimetic Nanochannels in aqueous solutions for ion transport regulation have been extensively studied. Few studies on non-aqueous systems, gel-based Nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion transport in Nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic Nanochannel system by employing the agarose hydrogel in conical Nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion transport behavior in gel-based Nanochannels is systemically investigated. The experimental results show that the ion transport behaviors in gel-Nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.
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engineered Nanochannel membranes with diode like behavior for energy conversion over a wide ph range
ACS Applied Materials & Interfaces, 2019Co-Authors: Xin Sui, Lei Jiang, Liping Wen, Zhen Zhang, Longcheng Gao, Yong Zhao, Lijun YangAbstract:Electric eels can generate high potential bioelectricity because of the numerous electrocytes, where the cell membranes contain ion-selective channels. Net electric current is formed by the directional permeation of ions across the channels. Many nanofluidic devices have been designed for energy conversion. However, the challenge still remains of the fabrication of scalable ion-selective membranes with high power density. Inspired by the electric eels, we designed an asymmetric Nanochannel membrane with diode-like ion transport behaviors, resulting in high performance energy conversion over a wide pH range. The Nanochannel membranes were obtained from the polymeric Nanochannels with carboxyl groups and the anodic alumina oxide (AAO) Nanochannels bearing hydroxyl groups. At different pH conditions, the synergistic effect of the hybrid Nanochannels ensured directional ion regulation, leading to energy conversion with high power density. The scalable, versatile Nanochannel membranes have promising potential ...
Xiang-yu Kong - One of the best experts on this subject based on the ideXlab platform.
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robust sulfonated poly ether ether ketone Nanochannels for high performance osmotic energy conversion
National Science Review, 2020Co-Authors: Yuanyuan Zhao, Lei Jiang, Yongchao Qian, Xiang-yu Kong, Jinhui Pang, Jin Wang, Weiwen Xin, Teng Zhou, Linsen Yang, Liping WenAbstract:The membrane-based reverse electrodialysis (RED) technique has a fundamental role in harvesting clean and sustainable osmotic energy existing in the salinity gradient. However, the current designs of membranes cannot cope with the high output power density and robustness. Here, we construct a sulfonated poly (ether ether ketone) (SPEEK) Nanochannel membrane with numerous Nanochannels for a membrane-based osmotic power generator. The parallel Nanochannels with high space charges show excellent cation-selectivity, which could further be improved by adjusting the length and charge density of Nanochannels. Based on numerical simulation, the system with space charge shows better conductivity and selectivity than those of a surface-charged Nanochannel. The output power density of our proposed membrane-based device reaches up to 5.8 W/m2 by mixing artificial seawater and river water. Additionally, the SPEEK membranes exhibit good mechanical properties, endowing the possibility of creating a high-endurance scale-up membrane-based generator system. We believe that this work provides useful insights into material design and fluid transport for the power generator in osmotic energy conversion.
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bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion transport regulation
Chemical Communications, 2020Co-Authors: Yunfei Teng, Yongchao Qian, Weipeng Chen, Xiang-yu Kong, Pei Li, Lei JiangAbstract:Biological ion channel-based mass transport and signal transduction play a crucial role in physiological activities, and biomimetic Nanochannels in aqueous solutions for ion transport regulation have been extensively studied. Few studies on non-aqueous systems, gel-based Nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion transport in Nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic Nanochannel system by employing the agarose hydrogel in conical Nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion transport behavior in gel-based Nanochannels is systemically investigated. The experimental results show that the ion transport behaviors in gel-Nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.
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correction bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion transport regulation
Chemical Communications, 2020Co-Authors: Congcong Zhu, Lei Jiang, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Liping WenAbstract:Biological ion channel-based mass transport and signal transduction play a crucial role in physiological activities, and biomimetic Nanochannels in aqueous solutions for ion transport regulation have been extensively studied. Few studies on non-aqueous systems, gel-based Nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion transport in Nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic Nanochannel system by employing the agarose hydrogel in conical Nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion transport behavior in gel-based Nanochannels is systemically investigated. The experimental results show that the ion transport behaviors in gel-Nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.
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corrigendum a sequential recognition for zinc ion and pyrophosphate based on a terpyridine derivative functionalized single Nanochannel
ChemPhysChem, 2017Co-Authors: Yuqi Zhang, Xiang-yu Kong, Pei Li, Ru Zhou, Zhiju Zhao, Zhen Zhang, Kai Xiao, Lei JiangAbstract:A highly selective recognition system for Zinc (II) ion and pyrophosphate (PPi) has been constructed using a N′‒(4‒((2,2′:6′,2″‒terpyridine)‒4‒yl)benzyl)ethane‒1,2‒diamine (TPYD) functionalized single conical Nanochannel by covalent attachment. The immobilized TPYD acted as a specific coordination site for Zn2+ to form TPYD‒Zn2+ complexes over other metal ions, and subsequently, the resulted Zn2+‒coordinated Nanochannel could be employed as selective recognition elements for PPi ion based on the coordination reaction between hydroxyl oxygen of PPi and Zn2+. The recognition was monitored by measuring the current‒voltage (I‒V) curves of the systems. The ionic current of the TPYD‒functionalized system at ‒2.0 V underwent a clear decrease after exposure to Zn2+ and followed with an obvious increase after subsequent treatment with PPi solution. The change of ionic current could be primarily attributed to the variation of charge density of the Nanochannel. This functionalized single Nanochannel could provide a simple and universal way to recognize different targets by modifying different functional molecules onto the inner surface of Nanochannels.
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sequential recognition of zinc and pyrophosphate ions in a terpyridine functionalized single Nanochannel
ChemPhysChem, 2017Co-Authors: Yuqi Zhang, Ganhua Xie, Xiang-yu Kong, Ru Zhou, Zhiju Zhao, Zhen Zhang, Kai Xiao, Qian Liu, Zhengping Liu, Liping WenAbstract:A highly selective recognition system for zinc(II) and pyrophosphate ions is constructed using a single conical Nanochannel covalently functionalized with N'-{4-[(2,2':6',2''-terpyridine)-4-yl]benzyl}ethane-1,2-diamine (TPYD). The immobilized TPYD acts as a specific coordination site for Zn2+ to form TPYD-Zn2+ complexes in preference over other metal ions, and subsequently, the resulting Zn2+ -coordinated Nanochannel can be used as a selective recognition element for the pyrophosphate ion based on the coordination reaction between hydroxyl oxygen atoms of pyrophosphate and Zn2+ . Ion recognition is monitored by measuring the current-voltage curves of the solutions. The ionic current of the TPYD-functionalized system at -2.0 V undergoes a clear decrease after exposure to Zn2+ ions and is followed with an obvious increase after subsequent treatment with a pyrophosphate solution. The change of ionic current can be primarily attributed to the variation of charge density of the Nanochannel. This functionalized single Nanochannel might provide a simple and universal means to recognize other targets by modifying different functional molecules onto the inner surfaces of Nanochannels.
Yongchao Qian - One of the best experts on this subject based on the ideXlab platform.
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robust sulfonated poly ether ether ketone Nanochannels for high performance osmotic energy conversion
National Science Review, 2020Co-Authors: Yuanyuan Zhao, Lei Jiang, Yongchao Qian, Xiang-yu Kong, Jinhui Pang, Jin Wang, Weiwen Xin, Teng Zhou, Linsen Yang, Liping WenAbstract:The membrane-based reverse electrodialysis (RED) technique has a fundamental role in harvesting clean and sustainable osmotic energy existing in the salinity gradient. However, the current designs of membranes cannot cope with the high output power density and robustness. Here, we construct a sulfonated poly (ether ether ketone) (SPEEK) Nanochannel membrane with numerous Nanochannels for a membrane-based osmotic power generator. The parallel Nanochannels with high space charges show excellent cation-selectivity, which could further be improved by adjusting the length and charge density of Nanochannels. Based on numerical simulation, the system with space charge shows better conductivity and selectivity than those of a surface-charged Nanochannel. The output power density of our proposed membrane-based device reaches up to 5.8 W/m2 by mixing artificial seawater and river water. Additionally, the SPEEK membranes exhibit good mechanical properties, endowing the possibility of creating a high-endurance scale-up membrane-based generator system. We believe that this work provides useful insights into material design and fluid transport for the power generator in osmotic energy conversion.
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bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion transport regulation
Chemical Communications, 2020Co-Authors: Yunfei Teng, Yongchao Qian, Weipeng Chen, Xiang-yu Kong, Pei Li, Lei JiangAbstract:Biological ion channel-based mass transport and signal transduction play a crucial role in physiological activities, and biomimetic Nanochannels in aqueous solutions for ion transport regulation have been extensively studied. Few studies on non-aqueous systems, gel-based Nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion transport in Nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic Nanochannel system by employing the agarose hydrogel in conical Nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion transport behavior in gel-based Nanochannels is systemically investigated. The experimental results show that the ion transport behaviors in gel-Nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.
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correction bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion transport regulation
Chemical Communications, 2020Co-Authors: Congcong Zhu, Lei Jiang, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Liping WenAbstract:Biological ion channel-based mass transport and signal transduction play a crucial role in physiological activities, and biomimetic Nanochannels in aqueous solutions for ion transport regulation have been extensively studied. Few studies on non-aqueous systems, gel-based Nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion transport in Nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic Nanochannel system by employing the agarose hydrogel in conical Nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion transport behavior in gel-based Nanochannels is systemically investigated. The experimental results show that the ion transport behaviors in gel-Nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.
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a pb2 ionic gate with enhanced stability and improved sensitivity based on a 4 aminobenzo 18 crown 6 modified funnel shaped Nanochannel
Faraday Discussions, 2018Co-Authors: Yongchao Qian, Liping Wen, Zhen Zhang, Wei Tian, Lei JiangAbstract:The existence of heavy ions, such as Pb2+, in the external environment is potentially hazardous as these can be highly toxic to the human body. Inspired by the highly efficient ability of biological ion channels to recognize the metal ion, much effort has been devoted to investigating biomimetic ionic gates based on engineered solid-state conical nanopores/Nanochannels. However, the reported system generally displays relatively poor functionality and low stability due to the limited functional region. This article describes an ionic gate with enhanced stability and improved sensitivity based on an emerging advanced funnel-shaped Nanochannel system. The ionic gate is developed by anchoring the Pb2+ ion-responsive functional molecules, 4′-aminobenzo-18-crown-6 (4-AB18C6), onto the inner surface of a funnel-shaped polyethylene terephthalate (PET) Nanochannel. The system can selectively recognize Pb2+ with an ultra-low concentration of down to approximately 10−15 M and displays excellent stability. The Pb2+ ions will form positively charged complexes through specific association with 4-AB18C6, which would screen the negative charge existing on the channel walls, resulting in a decreased ionic current and also an “OFF state”. Since the ability of EDTA to associate with Pb2+ is much stronger than that of 4-AB18C6, the Nanochannel can also achieve reversible switching upon the alternating addition of Pb2+ ions and EDTA. The switching behaviors of the system were reflected by the good reproducibility of the tunable rectifying effect. The stability of the conical and funnel-shaped Nanochannels is also compared using current scanning under constant voltage. The results have shown that the stability of the funnel-shaped Nanochannel is much better than that of the conical Nanochannel, and this can be ascribed to its much longer critical region. Consequently, the funnel-shaped Nanochannels with enhanced stability and improved sensitivity can potentially be applied in ion transportation, sensors, drug release, and energy conversion.
Zhen Zhang - One of the best experts on this subject based on the ideXlab platform.
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engineered Nanochannel membranes with diode like behavior for energy conversion over a wide ph range
ACS Applied Materials & Interfaces, 2019Co-Authors: Xin Sui, Lei Jiang, Liping Wen, Zhen Zhang, Longcheng Gao, Yong Zhao, Lijun YangAbstract:Electric eels can generate high potential bioelectricity because of the numerous electrocytes, where the cell membranes contain ion-selective channels. Net electric current is formed by the directional permeation of ions across the channels. Many nanofluidic devices have been designed for energy conversion. However, the challenge still remains of the fabrication of scalable ion-selective membranes with high power density. Inspired by the electric eels, we designed an asymmetric Nanochannel membrane with diode-like ion transport behaviors, resulting in high performance energy conversion over a wide pH range. The Nanochannel membranes were obtained from the polymeric Nanochannels with carboxyl groups and the anodic alumina oxide (AAO) Nanochannels bearing hydroxyl groups. At different pH conditions, the synergistic effect of the hybrid Nanochannels ensured directional ion regulation, leading to energy conversion with high power density. The scalable, versatile Nanochannel membranes have promising potential ...
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engineered Nanochannel membranes with diode like behavior for energy conversion over a wide ph range
ACS Applied Materials & Interfaces, 2019Co-Authors: Xin Sui, Lei Jiang, Liping Wen, Zhen Zhang, Longcheng Gao, Yong Zhao, Lijun YangAbstract:Electric eels can generate high potential bioelectricity because of the numerous electrocytes, where the cell membranes contain ion-selective channels. Net electric current is formed by the directional permeation of ions across the channels. Many nanofluidic devices have been designed for energy conversion. However, the challenge still remains of the fabrication of scalable ion-selective membranes with high power density. Inspired by the electric eels, we designed an asymmetric Nanochannel membrane with diode-like ion transport behaviors, resulting in high performance energy conversion over a wide pH range. The Nanochannel membranes were obtained from the polymeric Nanochannels with carboxyl groups and the anodic alumina oxide (AAO) Nanochannels bearing hydroxyl groups. At different pH conditions, the synergistic effect of the hybrid Nanochannels ensured directional ion regulation, leading to energy conversion with high power density. The scalable, versatile Nanochannel membranes have promising potential applications in the salinity gradient energy harvest from various sources.
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a pb2 ionic gate with enhanced stability and improved sensitivity based on a 4 aminobenzo 18 crown 6 modified funnel shaped Nanochannel
Faraday Discussions, 2018Co-Authors: Yongchao Qian, Liping Wen, Zhen Zhang, Wei Tian, Lei JiangAbstract:The existence of heavy ions, such as Pb2+, in the external environment is potentially hazardous as these can be highly toxic to the human body. Inspired by the highly efficient ability of biological ion channels to recognize the metal ion, much effort has been devoted to investigating biomimetic ionic gates based on engineered solid-state conical nanopores/Nanochannels. However, the reported system generally displays relatively poor functionality and low stability due to the limited functional region. This article describes an ionic gate with enhanced stability and improved sensitivity based on an emerging advanced funnel-shaped Nanochannel system. The ionic gate is developed by anchoring the Pb2+ ion-responsive functional molecules, 4′-aminobenzo-18-crown-6 (4-AB18C6), onto the inner surface of a funnel-shaped polyethylene terephthalate (PET) Nanochannel. The system can selectively recognize Pb2+ with an ultra-low concentration of down to approximately 10−15 M and displays excellent stability. The Pb2+ ions will form positively charged complexes through specific association with 4-AB18C6, which would screen the negative charge existing on the channel walls, resulting in a decreased ionic current and also an “OFF state”. Since the ability of EDTA to associate with Pb2+ is much stronger than that of 4-AB18C6, the Nanochannel can also achieve reversible switching upon the alternating addition of Pb2+ ions and EDTA. The switching behaviors of the system were reflected by the good reproducibility of the tunable rectifying effect. The stability of the conical and funnel-shaped Nanochannels is also compared using current scanning under constant voltage. The results have shown that the stability of the funnel-shaped Nanochannel is much better than that of the conical Nanochannel, and this can be ascribed to its much longer critical region. Consequently, the funnel-shaped Nanochannels with enhanced stability and improved sensitivity can potentially be applied in ion transportation, sensors, drug release, and energy conversion.
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corrigendum a sequential recognition for zinc ion and pyrophosphate based on a terpyridine derivative functionalized single Nanochannel
ChemPhysChem, 2017Co-Authors: Yuqi Zhang, Xiang-yu Kong, Pei Li, Ru Zhou, Zhiju Zhao, Zhen Zhang, Kai Xiao, Lei JiangAbstract:A highly selective recognition system for Zinc (II) ion and pyrophosphate (PPi) has been constructed using a N′‒(4‒((2,2′:6′,2″‒terpyridine)‒4‒yl)benzyl)ethane‒1,2‒diamine (TPYD) functionalized single conical Nanochannel by covalent attachment. The immobilized TPYD acted as a specific coordination site for Zn2+ to form TPYD‒Zn2+ complexes over other metal ions, and subsequently, the resulted Zn2+‒coordinated Nanochannel could be employed as selective recognition elements for PPi ion based on the coordination reaction between hydroxyl oxygen of PPi and Zn2+. The recognition was monitored by measuring the current‒voltage (I‒V) curves of the systems. The ionic current of the TPYD‒functionalized system at ‒2.0 V underwent a clear decrease after exposure to Zn2+ and followed with an obvious increase after subsequent treatment with PPi solution. The change of ionic current could be primarily attributed to the variation of charge density of the Nanochannel. This functionalized single Nanochannel could provide a simple and universal way to recognize different targets by modifying different functional molecules onto the inner surface of Nanochannels.
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sequential recognition of zinc and pyrophosphate ions in a terpyridine functionalized single Nanochannel
ChemPhysChem, 2017Co-Authors: Yuqi Zhang, Ganhua Xie, Xiang-yu Kong, Ru Zhou, Zhiju Zhao, Zhen Zhang, Kai Xiao, Qian Liu, Zhengping Liu, Liping WenAbstract:A highly selective recognition system for zinc(II) and pyrophosphate ions is constructed using a single conical Nanochannel covalently functionalized with N'-{4-[(2,2':6',2''-terpyridine)-4-yl]benzyl}ethane-1,2-diamine (TPYD). The immobilized TPYD acts as a specific coordination site for Zn2+ to form TPYD-Zn2+ complexes in preference over other metal ions, and subsequently, the resulting Zn2+ -coordinated Nanochannel can be used as a selective recognition element for the pyrophosphate ion based on the coordination reaction between hydroxyl oxygen atoms of pyrophosphate and Zn2+ . Ion recognition is monitored by measuring the current-voltage curves of the solutions. The ionic current of the TPYD-functionalized system at -2.0 V undergoes a clear decrease after exposure to Zn2+ ions and is followed with an obvious increase after subsequent treatment with a pyrophosphate solution. The change of ionic current can be primarily attributed to the variation of charge density of the Nanochannel. This functionalized single Nanochannel might provide a simple and universal means to recognize other targets by modifying different functional molecules onto the inner surfaces of Nanochannels.
