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Bucior BJ, Kolmakov GV, Male JM, Liu J, Chen DL, Kumar P, Johnson JK. Adsorption and Diffusion of Fluids in Defective Carbon Nanotubes: Insights from Molecular Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:11834-11844. [PMID: 28915730 DOI: 10.1021/acs.langmuir.7b02841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Single-walled carbon nanotubes (SWNTs) have been shown from both simulations and experiments to have remarkably low resistance to gas and liquid transport. This has been attributed to the remarkably smooth interior surface of pristine SWNTs. However, real SWNTs are known to have various defects that depend on the synthesis method and procedure used to activate the SWNTs. In this paper, we study adsorption and transport properties of atomic and molecular fluids in SWNTs having vacancy point defects. We construct models of defective nanotubes that have either unrelaxed defects, where the overall structure of the SWNT is not changed, or reconstructed defects, where the bonding topology and therefore the shape of the SWNT is allowed to change. Furthermore, we include partial atomic charges on the SWNT carbon atoms due to the reconstructed defects. We consider adsorption and diffusion of Ar atoms and CO2 and H2O molecules as examples of a noble gas, a linear quadrupolar fluid, and a polar fluid. Adsorption isotherms were found to be fairly insensitive to the defects, even for the case of water in the charged, reconstructed SWNT. We have computed both the self-diffusivities and corrected diffusivities (which are directly related to the transport diffusivities) for each of these fluids. In general, we found that at zero loading that defects can dramatically reduce the self- and corrected diffusivities. However, at high, liquidlike loadings, the self-diffusion coefficients for pristine and defective nanotubes are very similar, indicating that fluid-fluid collisions dominate the dynamics over the fluid-SWNT collisions. In contrast, the corrected diffusion coefficients can be more than an order of magnitude lower for water in defective SWNTs. This dramatic decrease in the transport diffusion is due to the formation of an ordered structure of water, which forms around a local defect site. It is therefore important to properly characterize the level and types of defects when accurate transport diffusivities are needed.
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Affiliation(s)
- Benjamin J Bucior
- Department of Chemical & Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
- Chemical & Biological Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - German V Kolmakov
- Department of Chemical & Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
- Physics Department, NYC College of Technology, the City University of New York , Brooklyn, New York 11201, United States
| | - JoAnna M Male
- Department of Chemical & Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
| | - Jinchen Liu
- Department of Chemical & Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
| | - De-Li Chen
- Department of Chemical & Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
- Institute of Physical Chemistry, Zhejiang Normal University , Jinhua 321004, China
| | - Prashant Kumar
- Department of Chemical & Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
| | - J Karl Johnson
- Department of Chemical & Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
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Cao W, Lu L, Zhou M, Tow GM, Huang L, Yang T, Lu X. Hydrophilicity effect on CO2/CH4 separation using carbon nanotube membranes: insights from molecular simulation. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2016.1267353] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Wei Cao
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P.R.China
| | - Linghong Lu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P.R.China
| | - Musen Zhou
- 2011 College, Nanjing Tech University, Nanjing, P.R.China
| | - Garrett M. Tow
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK, USA
| | - Liangliang Huang
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK, USA
| | - Tingting Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P.R.China
| | - Xiaohua Lu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P.R.China
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Zhu Y, Ruan Y, Wu X, Lu X, Zhang Y, Lu L. Electric Field-Responsive Nanopores with Ion Selectivity: Controlling Based on Transport Resistance. Chem Eng Technol 2016. [DOI: 10.1002/ceat.201500637] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Winarto, Takaiwa D, Yamamoto E, Yasuoka K. Structures of water molecules in carbon nanotubes under electric fields. J Chem Phys 2015; 142:124701. [DOI: 10.1063/1.4914462] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Winarto
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Daisuke Takaiwa
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Eiji Yamamoto
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kenji Yasuoka
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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Li H, Fan JF, Li R, Yu Y, Yan XL. Molecular dynamics studies on the influences of a gradient electric field on the water chain in a peptide nanotube. J Mol Model 2014; 20:2370. [DOI: 10.1007/s00894-014-2370-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Accepted: 06/29/2014] [Indexed: 11/28/2022]
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