scholarly journals Response to Comment on “Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins”

Science ◽  
2018 ◽  
Vol 359 (6383) ◽  
pp. eaaq1241 ◽  
Author(s):  
Ramya H. Tunuguntla ◽  
Yuliang Zhang ◽  
Robert Y. Henley ◽  
Yun-Chiao Yao ◽  
T. Anh Pham ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Experimental Evidence ◽  
Water Transport ◽  
Water Permeability ◽  
Transport Mechanism ◽  
Ion Selectivity ◽  
High Water ◽  
Arrhenius Factor ◽  
Rule Out

Horner and Pohl argue that high water transport rates reported for carbon nanotube porins (CNTPs) originate from leakage at the nanotube-bilayer interface. Our results and new experimental evidence are consistent with transport through the nanotube pores and rule out a defect-mediated transport mechanism. Mechanistic origins of the high Arrhenius factor that we reported for narrow CNTPs at pH 8 require further investigation.

scholarly journals Comment on “Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins”

Science ◽  
2018 ◽  
Vol 359 (6383) ◽  
pp. eaap9173 ◽  
Author(s):  
Andreas Horner ◽  
Peter Pohl
Keyword(s):  
Activation Energy ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Water Transport ◽  
Water Permeability ◽  
Ion Selectivity ◽  
Membrane Interface ◽  
Single File ◽  
Lower Activation ◽  
Lower Activation Energy

Tunuguntla et al. (Reports, 25 August 2017, p. 792) report that permeation of single-file water occurs faster through carbon nanotubes than through aquaporins. We show that this conclusion violates fundamental thermodynamic laws: Because of its much lower activation energy, aquaporin-mediated water transport must be orders of magnitude faster. Leakage at the nanotube-membrane interface may explain the discrepancy.

scholarly journals Vertically Aligned Carbon Nanotube Membranes: Water Purification and Beyond

Membranes ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 273
Author(s):  
Jeong Hoon Lee ◽  
Han-Shin Kim ◽  
Eun-Tae Yun ◽  
So-Young Ham ◽  
Jeong-Hoon Park ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Water Purification ◽  
Water Permeability ◽  
Proton Exchange Membrane ◽  
Antibacterial Properties ◽  
High Water ◽  
Proton Exchange ◽  
Conductive Membranes ◽  
Potential Applications ◽  
Vertically Aligned

Vertically aligned carbon nanotube (VACNT) membranes have attracted significant attention for water purification owing to their ultra-high water permeability and antibacterial properties. In this paper, we critically review the recent progresses in the synthesis of VACNT arrays and fabrication of VACNT membrane methods, with particular emphasis on improving water permeability and anti-biofouling properties. Furthermore, potential applications of VACNT membranes other than water purification (e.g., conductive membranes, electrodes in proton exchange membrane fuel cells, and solar electricity–water generators) have been introduced. Finally, future outlooks are provided to overcome the limitations of commercialization and desalination currently faced by VACNT membranes. This review will be useful to researchers in the broader scientific community as it discusses current and new trends regarding the development of VACNT membranes as well as their potential applications.

scholarly journals Foldamer-Based Ultrapermeable and Highly Selective Artificial Aquaporins that Exclude Protons

2020 ◽  
Author(s):  
Arundhati Roy ◽  
Jie Shen ◽  
Himanshu Joshi ◽  
Woochul Song ◽  
Yu-Ming Tu ◽  
...  
Keyword(s):  
Water Transport ◽  
Recent Progress ◽  
Ion Selectivity ◽  
High Water ◽  
High Rate ◽  
Water Molecules ◽  
Monovalent Ion ◽  
Hallmark Feature ◽  
Artificial Water ◽  
Made In

The outstanding capacity of aquaporins (AQPs) for mediating highly selective superfast water transport1-7 has inspired recent development of supramolecular monovalent ion-excluding artificial water channels (AWCs). AWC-based bioinspired membranes are proposed for desalination, water purification, and other separations applications8-18. While some recent progress has been made in synthesizing AWCs that approach the water permeability and ion selectivity of AQPs, a hallmark feature of AQPs – high water transport while excluding protons has not been reproduced. We report on a class of biomimetic, helically folded pore-forming polymeric foldamers, that can serve as long sought-after highly selective ultrafast water-conducting channels exceeding those of AQPs (1.1 × 1010 H2O molecules/s for AQP17), with high water over monovalent ion transport selectivity (~108 water molecules over Cl- ion) conferred by the modularly tunable hydrophobicity of the interior pore surface. The best-performing AWC reported here delivers water transport at an exceptionally high rate, 2.5 times that of AQP1, while concurrently rejecting salts (NaCl and KCl) and even protons.

scholarly journals Foldamer-Based Ultrapermeable and Highly Selective Artificial Aquaporins that Exclude Protons

2020 ◽  
Author(s):  
Arundhati Roy ◽  
Jie Shen ◽  
Himanshu Joshi ◽  
Woochul Song ◽  
Yu-Ming Tu ◽  
...  
Keyword(s):  
Water Transport ◽  
Recent Progress ◽  
Ion Selectivity ◽  
High Water ◽  
High Rate ◽  
Water Molecules ◽  
Monovalent Ion ◽  
Hallmark Feature ◽  
Artificial Water ◽  
Made In

The outstanding capacity of aquaporins (AQPs) for mediating highly selective superfast water transport1-7 has inspired recent development of supramolecular monovalent ion-excluding artificial water channels (AWCs). AWC-based bioinspired membranes are proposed for desalination, water purification, and other separations applications8-18. While some recent progress has been made in synthesizing AWCs that approach the water permeability and ion selectivity of AQPs, a hallmark feature of AQPs – high water transport while excluding protons has not been reproduced. We report on a class of biomimetic, helically folded pore-forming polymeric foldamers, that can serve as long sought-after highly selective ultrafast water-conducting channels exceeding those of AQPs (1.1 × 1010 H2O molecules/s for AQP17), with high water over monovalent ion transport selectivity (~108 water molecules over Cl- ion) conferred by the modularly tunable hydrophobicity of the interior pore surface. The best-performing AWC reported here delivers water transport at an exceptionally high rate, 2.5 times that of AQP1, while concurrently rejecting salts (NaCl and KCl) and even protons.

scholarly journals The Bionic Water Channel of Ultra-Short, High Affinity Carbon Nanotubes with High Water Permeability and Proton Selectivity

2020 ◽  
Vol 13 (1) ◽  
pp. 102
Author(s):  
Guangli Liu ◽  
Bin Zhou ◽  
Jinwei Liu ◽  
Huazhang Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Water Permeability ◽  
Lipid Membrane ◽  
Ion Selectivity ◽  
Biological Membrane ◽  
Water Channel ◽  
High Water ◽  
Structural Features ◽  
High Affinity ◽  
Salt Ions

The development of the bionic water channel aims to replace the possible use of natural aquaporins (AQPs) for water purification, while retaining the ability of natural AQPs to carry out ultra-fast water transport and repel ions. Carbon nanotube channels (CNTCs) are a convenient membrane-based model system for studying nano-fluidic transport that replicates a number of key structural features of biological membrane channels. In this report, we describe protocols for CNTCs synthesis by ultrasound-assisted cutting of long CNTs in the presence of lipid amphiphiles. CNTCs have a similar thickness to the lipid membrane and high affinity for it. The ultra-short high-affinity CNTCs have high permeability and ion selectivity. The water permeability of the CNTCs is 1936 ± 123 μm/s, which is 2.3 times that of natural AQPs, and completely rejects salt ions. In general, carbon nanotubes represent a multifunctional nanopore building module for creating high-ranking functional bionic materials. This study has reference significance for the design of new bionic water channel and the actual development of bionic membrane based on CNTs.

Transport mechanism of water molecules passing through polyamide/COF mixed matrix membranes

2019 ◽  
Vol 21 (48) ◽  
pp. 26591-26597 ◽  
Author(s):  
Yang Song ◽  
Mingjie Wei ◽  
Fang Xu ◽  
Yong Wang
Keyword(s):  
Water Permeability ◽  
Transport Mechanism ◽  
High Water ◽  
Mixed Matrix Membranes ◽  
Water Molecules ◽  
Mixed Matrix ◽  
Salt Rejection ◽  
The Cost ◽  
Significant Attention ◽  
Matrix Membranes

Mixed matrix membranes (MMMs) have gained significant attention due to their high water permeability without the cost of salt rejection. The mechanism of permeability promotion for PA/COFs MMMs is investigated in this work from molecular insights.

scholarly journals Impact of PEG additives and pore rim functionalization on water transport through sub-1 nm carbon nanotube porins

2018 ◽  
Vol 209 ◽  
pp. 359-369 ◽  
Author(s):  
Ramya H. Tunuguntla ◽  
Andrew Y. Hu ◽  
Yuliang Zhang ◽  
Aleksandr Noy
Keyword(s):  
Carbon Nanotube ◽  
Water Transport ◽  
Lipid Membrane ◽  
High Water ◽  
The Past ◽  
Membrane Matrix ◽  
Ion Selectivities

In the past, sub-1 nm diameter carbon nanotube porins embedded in a lipid membrane matrix demonstrated extremely high water permeabilities and strong ion selectivities. In this work, we explore additional factors that influence transport in these channels.

Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins

Science ◽  
2017 ◽  
Vol 357 (6353) ◽  
pp. 792-796 ◽  
Author(s):  
Ramya H. Tunuguntla ◽  
Robert Y. Henley ◽  
Yun-Chiao Yao ◽  
Tuan Anh Pham ◽  
Meni Wanunu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Water Permeability ◽  
Ion Selectivity

scholarly journals Foldamer-Based Ultrapermeable and Highly Selective Artificial Water Channels that Exclude Protons

2021 ◽  
Author(s):  
Arundhati Roy ◽  
Jie Shen ◽  
Himanshu Joshi ◽  
Woochul Song ◽  
Yu-Ming Tu ◽  
...  
Keyword(s):  
Water Transport ◽  
Ion Selectivity ◽  
High Water ◽  
Water Channels ◽  
High Rate ◽  
Water Molecules ◽  
Monovalent Ion ◽  
Hallmark Feature ◽  
Artificial Water ◽  
Made In

The outstanding capacity of aquaporins (AQPs) for mediating highly selective superfast water transport1-7 has inspired recent development of supramolecular monovalent ion-excluding artificial water channels (AWCs). AWC-based bioinspired membranes are proposed for desalination, water purification, and other separations applications8-18. While some recent progress has been made in synthesizing AWCs that approach the water permeability and ion selectivity of AQPs, a hallmark feature of AQPs – high water transport while excluding protons has not been reproduced. We report on a class of biomimetic, helically folded pore-forming polymeric foldamers, that can serve as long sought-after highly selective ultrafast water-conducting channels exceeding those of AQPs (1.1 × 1010 H2O molecules/s for AQP17), with high water over monovalent ion transport selectivity (~108 water molecules over Cl- ion) conferred by the modularly tunable hydrophobicity of the interior pore surface. The best-performing AWC reported here delivers water transport at an exceptionally high rate, 2.5 times that of AQP1, while concurrently rejecting salts (NaCl and KCl) and even protons.

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