1
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Rezayani M, Sharif F, Netz RR, Makki H. Insight into the relationship between molecular morphology and water/ion diffusion in cation exchange membranes: Case of partially sulfonated polyether sulfone. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120561] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Effective ion mobility in anion exchange ionomers: Relations with hydration, porosity, tortuosity, and percolation. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118622] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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3
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An MD-based systematic study on the mechanical characteristics of a novel hybrid CNT/graphene drug carrier. J Mol Model 2020; 26:241. [PMID: 32814981 DOI: 10.1007/s00894-020-04487-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 07/27/2020] [Indexed: 10/23/2022]
Abstract
This paper is aimed to assess the mechanical properties of a hybrid graphene-carbon nanotube carrier embedded with doxorubicin (DOX). Utilizing molecular dynamics simulation, the results reveal that by increasing the temperature from 309 to 313 K, the elastic modulus of the GS/CNT/DOX carrier decreases from 0.8 to 0.74 TPa. Also, it is shown that the presence of chitosan molecules enhances the mechanical characteristics of the proposed nanocarrier. Taking the chirality of the graphene sheet into account, the results indicate that by increasing the size of the graphene sheet, the failure stress is slightly increased for the armchair type. However, this value decreases as the size of the zigzag sample increases. Additionally, the influence of aspect ratio on the elastic modulus, fracture stress, and fracture strain of these systems is systematically examined. It has been shown that the failure stress may change significantly with increasing this parameter, especially for carrier systems having zigzag carbon nanostructures. Moreover considering various voids content in the CNT structure, the weakening effect of defects is systematically explored. Also, the dependence of the mechanical features of the proposed hybrid carrier on the presence of DOX molecules is studied via MD simulations. Finally, we have investigated the role of CNT physical characteristics including its size and chirality on the results. Graphical abstract.
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4
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Rahmati M, Jangali M, Rezaei H. An investigation of proton conductivity of PVA, PBI and SPEEK polymer membranes using molecular dynamics simulation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111781] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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5
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Esmaeili N, Gray EM, Webb CJ. Non-Fluorinated Polymer Composite Proton Exchange Membranes for Fuel Cell Applications - A Review. Chemphyschem 2019; 20:2016-2053. [PMID: 31334917 DOI: 10.1002/cphc.201900191] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 05/05/2019] [Indexed: 11/11/2022]
Abstract
The critical component of a proton exchange membrane fuel cell (PEMFC) system is the proton exchange membrane (PEM). Perfluorosulfonic acid membranes such as Nafion are currently used for PEMFCs in industry, despite suffering from reduced proton conductivity due to dehydration at higher temperatures. However, operating at temperatures below 100 °C leads to cathode flooding, catalyst poisoning by CO, and complex system design with higher cost. Research has concentrated on the membrane material and on preparation methods to achieve high proton conductivity, thermal, mechanical and chemical stability, low fuel crossover and lower cost at high temperatures. Non-fluorinated polymers are a promising alternative. However, improving the efficiency at higher temperatures has necessitated modifications and the inclusion of inorganic materials in a polymer matrix to form a composite membrane can be an approach to reach the target performance, while still reducing costs. This review focuses on recent research in composite PEMs based on non-fluorinated polymers. Various inorganic fillers incorporated in the PEM structure are reviewed in terms of their properties and the effect on PEM fuel cell performance. The most reliable polymers and fillers with potential for high temperature proton exchange membranes (HTPEMs) are also discussed.
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Affiliation(s)
- Nazila Esmaeili
- Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan, 4111, Brisbane, Australia
| | - Evan MacA Gray
- Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan, 4111, Brisbane, Australia
| | - Colin J Webb
- Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan, 4111, Brisbane, Australia
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6
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Wang R, Liu S, Wang L, Li M, Gao C. Understanding of Nanophase Separation and Hydrophilic Morphology in Nafion and SPEEK Membranes: A Combined Experimental and Theoretical Studies. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E869. [PMID: 31181646 PMCID: PMC6631217 DOI: 10.3390/nano9060869] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 06/02/2019] [Accepted: 06/03/2019] [Indexed: 01/12/2023]
Abstract
The understanding of the relationship between the chemical structure and the hydrophilic structure is crucial for the designing of high-performance PEMs. Comparative studies in typical Nafion and sulfonated poly (ether ether ketone) (SPEEK) were performed using a combined experimental and theoretical method. SPEEK showed suppressed fuel crossover and good mechanical property but low water uptake, weak phase separation, and inadequate proton conductivity. Molecular dynamics (MD) simulation approaches were employed to get a molecular-level understanding of the structure-property relationship of SPEEK and Nafion membranes. In SPEEK membranes, the local aggregation of hydrophilic clusters is worse, and much stronger electrostatic interaction between Os-Hh was verified, resulting in less delocalized free H3O+ and much lower DH3O+. In addition, the probability of H2O-H3O+ association varied with water content. Particularly, SPEEK exhibited much lower H9O4+ probability at various relative water contents, leading to lower structural diffusivity than Nafion. Eventually, SPEEK possessed low vehicular and structural diffusivities, which resulted in a low proton conductivity. The results indicated that the structure of hydrated hydronium complexes would deform to adapt the confining hydrophilic channels. The confinement effect on diffusion of H2O and H3O+ is influenced by the water content and the hydrophilic morphologies. This study provided a new insight into the exploration of high-performance membranes in fuel cell.
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Affiliation(s)
- Rujie Wang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Shanshan Liu
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Lidong Wang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Ming Li
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
| | - Chong Gao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
- MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
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7
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Nimmanpipug P, Kodchakorn K, Lee VS, Yana J, Jarumaneeroj C, Phongtamrug S, Chirachanchai S. Structural and transport phenomena of urocanate-based proton carrier in sulfonated poly(ether ether ketone) membrane composite. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/polb.24753] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Piyarat Nimmanpipug
- Computational Simulation and Molecular Modeling Laboratory (CSML), Department of Chemistry, Faculty of Science and Graduate School; Chiang Mai University; Chiang Mai 50200 Thailand
| | - Kanchanok Kodchakorn
- Computational Simulation and Molecular Modeling Laboratory (CSML), Department of Chemistry, Faculty of Science and Graduate School; Chiang Mai University; Chiang Mai 50200 Thailand
- Doctor of Philosophy Program in Chemistry, Faculty of Science; Chiang Mai University; Chiang Mai 50200 Thailand
| | | | - Janchai Yana
- Department of Chemistry, Faculty of Science and Technology; Chiang Mai Rajabhat University; Chiang Mai 50300 Thailand
| | - Chatchai Jarumaneeroj
- The Petroleum and Petrochemical College; Chulalongkorn University; Soi Chula 12, Phyathai Rd., Pathumwan, Bangkok 10330 Thailand
| | - Suttinun Phongtamrug
- Department of Industrial Chemistry, Faculty of Applied Science; King Mongkut's University of Technology North Bangkok; Bangkok 10800 Thailand
| | - Suwabun Chirachanchai
- The Petroleum and Petrochemical College; Chulalongkorn University; Soi Chula 12, Phyathai Rd., Pathumwan, Bangkok 10330 Thailand
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8
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Shaari N, Kamarudin SK, Basri S. Molecular dynamics simulations of sodium alginate/sulfonated graphene oxide membranes properties. Heliyon 2018; 4:e00808. [PMID: 30246163 PMCID: PMC6146620 DOI: 10.1016/j.heliyon.2018.e00808] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 08/04/2018] [Accepted: 09/13/2018] [Indexed: 11/15/2022] Open
Abstract
The influence of methanol as a solvent on the properties of sodium alginate/sulfonated graphene oxide (SA/SGO) membranes was explored in water-methanol mixed conditions with various methanol concentrations and temperatures through molecular dynamics simulations. The methanol uptake of the membrane showed an isolation phase determined from the simulation results. The distance between the sulfonic acid groups increased in higher methanol concentrations, as observed from S-S RDFs. Furthermore, the distance between the SA-chain RDFs and the solvent molecules was analysed to determine a) the affinity of water towards the sulfonic acid groups and b) the affinity of the aromatic backbone of the SA towards methanol molecules. A decrease in water molecule diffusion led to an increase in methanol diffusion and uptake. SA/SGO membranes exhibited a smaller diffusion coefficient than that for the Nafion membranes, as calculated from simulation results and compared to the experimental work. Additionally, the diffusion ability increased at higher temperatures for all permeants. The interaction information obtained is useful for DMFC applications.
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Affiliation(s)
- N Shaari
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
| | - S K Kamarudin
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia.,Chemical Engineering Programme, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
| | - S Basri
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
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9
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Li P, Wu W, Liu J, Shi B, Du Y, Li Y, Wang J. Investigating the nanostructures and proton transfer properties of Nafion-GO hybrid membranes. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.03.066] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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10
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Thermal Stability and Water Content Study of Void-Free Electrospun SPEEK/Cloisite Membrane for Direct Methanol Fuel Cell Application. Polymers (Basel) 2018; 10:polym10020194. [PMID: 30966230 PMCID: PMC6414944 DOI: 10.3390/polym10020194] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/12/2018] [Accepted: 02/13/2018] [Indexed: 11/25/2022] Open
Abstract
Void-free electrospun SPEEK/Cloisite15A® densed (SP/e-spunCL) membranes are prepared. Different loadings of Cloisite15A® (0.10, 0.15, 0.20, 0.25 and 0.30 wt %) are incorporated into electrospun fibers. The physico-chemical characteristics (methanol permeability, water uptake and proton conductivity) of the membranes are observed. Thermal stability of all membranes is observed using Thermal Gravimetry Analysis (TGA). The thrree stages of degradation range between 163.1 and 613.1 °C. Differential Scanning Calorimetry (DSC) is used to study the wettability of the membranes. SP/e-spunCL15 shows the lowest freezing bound water of 15.27%, which contributed to the lowest methanol permeability. The non-freezing bound water that proportionally increased with proton conductivity of SP/e-spunCL15 membrane is the highest, 10.60%. It is suggested that the electrospinning as the fabricating method has successfully exfoliated the Cloisite in the membrane surface structure, contributing to the decrease of methanol permeability, while the retained water has led to the enhancement of proton conductivity. This new fabrication method of SP/e-spunCL membrane is said to be a desirable polymer electrolyte membrane for future application in direct methanol fuel cell field.
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11
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Tripathy M, Kumar PBS, Deshpande AP. Molecular Structuring and Percolation Transition in Hydrated Sulfonated Poly(ether ether ketone) Membranes. J Phys Chem B 2017; 121:4873-4884. [PMID: 28430444 DOI: 10.1021/acs.jpcb.7b01045] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The extent of phase separation and water percolation in sulfonated membranes are the key to their performance in fuel cells. Toward this, the effect of hydration on the morphology and transport characteristics of sulfonated poly(ether ether ketone), sPEEK, membrane is investigated using atomistic molecular dynamics simulation at various hydration levels(λ: number of water molecules per sulfonate group). The evolution of local morphology is investigated using structural correlations and minimum pair distances. Transport properties are probed using mean squared displacements and diffusion coefficients. The water-sulfonate interaction in sPEEK is found to be stronger than that in Nafion, as observed in experiments. Analyses indicate the presence of narrow connected path of water and hydronium at λ = 4 and large domains, spanning half the simulation box, at λ = 15. The behavior of membrane water remains far from bulk as indicated by its diffusion coefficient. The persistence of small isolated water clusters demonstrates the extent of phase separation in sPEEK to be lesser than that in Nafion. Analyses at molecular and collective levels suggest the occurrence of a percolation transition between λ = 8 and 10, which leads to a connected network of water channels in the membrane, thereby boosting the hydronium mobility.
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Affiliation(s)
- Madhusmita Tripathy
- Department of Physics, Indian Institute of Technology Madras , Chennai, Tamil Nadu, 600036, India
| | - P B Sunil Kumar
- Department of Physics, Indian Institute of Technology Madras , Chennai, Tamil Nadu, 600036, India
| | - Abhijit P Deshpande
- Department of Chemical Engineering, Indian Institute of Technology Madras , Chennai, Tamil Nadu, 600036, India
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12
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Akbari S, Mosavian MTH, Moosavi F, Ahmadpour A. Molecular dynamics simulation of Keggin HPA doped Nafion® 117 as a polymer electrolyte membrane. RSC Adv 2017. [DOI: 10.1039/c7ra05929a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Nafion®/heteropoly acid (HPA) composite membranes and the impact of the anionic charge of HPA on water and hydronium dynamics were investigated using molecular dynamics simulation.
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Affiliation(s)
- S. Akbari
- Chemical Engineering Department
- Faculty of Engineering
- Ferdowsi University of Mashhad
- Iran
| | - M. T. Hamed Mosavian
- Chemical Engineering Department
- Faculty of Engineering
- Ferdowsi University of Mashhad
- Iran
| | - F. Moosavi
- Department of Chemistry
- Faculty of Science
- Ferdowsi University of Mashhad
- Iran
| | - A. Ahmadpour
- Chemical Engineering Department
- Faculty of Engineering
- Ferdowsi University of Mashhad
- Iran
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13
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Ma Y, Wang Y, Deng X, Zhou G, Khalid S, Sun X, Sun W, Zhou Q, Lu G. Dissipative particle dynamics and molecular dynamics simulations on mesoscale structure and proton conduction in a SPEEK/PVDF-g-PSSA membrane. RSC Adv 2017. [DOI: 10.1039/c7ra07301a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The blend morphologies evolve from disordered small particles to a regular PVDF cluster network, which were connected by SPEEK cylindrical channels.
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Affiliation(s)
- Yue Ma
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Yuxiang Wang
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Xuejian Deng
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Guanggang Zhou
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Sha Khalid
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Xiaoliang Sun
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Wei Sun
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Qiong Zhou
- College of Science
- China University of Petroleum
- Beijing 102249
- China
| | - Guiwu Lu
- College of Science
- China University of Petroleum
- Beijing 102249
- China
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14
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Bahlakeh G, Mahdi Hasani-Sadrabadi M, Jacob KI. Morphological and transport characteristics of swollen chitosan-based proton exchange membranes studied by molecular modeling. Biopolymers 2016; 107:5-19. [DOI: 10.1002/bip.22979] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 07/21/2016] [Accepted: 08/17/2016] [Indexed: 02/03/2023]
Affiliation(s)
- Ghasem Bahlakeh
- Department of Engineering and Technology; Golestan University; Aliabad Katool Iran
| | - Mohammad Mahdi Hasani-Sadrabadi
- Parker H, Petit Institute for Bioengineering and Bioscience, G.W. Woodruff School of Mechanical, Engineering; Georgia Institute of Technology; Atlanta 30332 GA
- Laboratoire de Microsystemes (LMIS4), Institute of Bioengineering, École Polytechnique Fédérale de Lausanne (EPFL); Lausanne Switzerland
| | - Karl I. Jacob
- Parker H, Petit Institute for Bioengineering and Bioscience, G.W. Woodruff School of Mechanical, Engineering; Georgia Institute of Technology; Atlanta 30332 GA
- School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta GA 30332
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15
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Khabaz F, Mani S, Khare R. Molecular Origins of Dynamic Coupling between Water and Hydrated Polyacrylate Gels. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00938] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fardin Khabaz
- Department of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
| | - Sriramvignesh Mani
- Department of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
| | - Rajesh Khare
- Department of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
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16
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Tripathy M, Deshpande AP, Kumar PBS. How Much Can We Coarse-Grain while Retaining the Chemical Specificity? A Study of Sulfonated Poly(ether ether ketone). MACROMOL THEOR SIMUL 2016. [DOI: 10.1002/mats201500077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Abhijit P. Deshpande
- Department of Chemical Engineering; Indian Institute of Technology; Madras 600036 India
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17
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Bahlakeh G, Hasani-Sadrabadi MM, Jacob KI. Exploring the hydrated microstructure and molecular mobility in blend polyelectrolyte membranes by quantum mechanics and molecular dynamics simulations. RSC Adv 2016. [DOI: 10.1039/c6ra05513c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
QMs and MD simulations were employed to investigate the effect of water contents and temperatures on structural and dynamical behaviors of blended PEMs.
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Affiliation(s)
- Ghasem Bahlakeh
- Department of Engineering and Technology
- Golestan University
- Aliabad Katool
- Iran
| | - Mohammad Mahdi Hasani-Sadrabadi
- Parker H. Petit Institute for Bioengineering and Bioscience
- G.W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Karl I. Jacob
- Parker H. Petit Institute for Bioengineering and Bioscience
- G.W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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18
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Mani S, Khabaz F, Godbole RV, Hedden RC, Khare R. Structure and Hydrogen Bonding of Water in Polyacrylate Gels: Effects of Polymer Hydrophilicity and Water Concentration. J Phys Chem B 2015; 119:15381-93. [DOI: 10.1021/acs.jpcb.5b08700] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sriramvignesh Mani
- Department
of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
| | - Fardin Khabaz
- Department
of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
| | - Rutvik V. Godbole
- Department
of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
| | - Ronald C. Hedden
- Department
of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
| | - Rajesh Khare
- Department
of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, United States
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19
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Razmimanesh F, Amjad-Iranagh S, Modarress H. Molecular dynamics simulation study of chitosan and gemcitabine as a drug delivery system. J Mol Model 2015; 21:165. [PMID: 26044358 DOI: 10.1007/s00894-015-2705-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Accepted: 05/17/2015] [Indexed: 12/20/2022]
Abstract
By using molecular dynamics (MD) simulation, biodegradable biopolymer chitosan as a carrier for the drug gemcitabine was investigated and the effect of three initial drug concentrations (10, 40, and 80%) on its loading efficiency was studied. Then water was added to the systems of drug and biopolymer and the effects of water on the interactions of drug and chitosan and on the drug loading efficiency were examined. From the results it was found that the maximum loading of the drug occurred at 40% of the drug concentration. The radial distribution function calculations indicated that in the absence of water molecules, the drug molecules were located at shorter distance from chitosan and the loading efficiency of the drug in these systems was higher.
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Affiliation(s)
- Fariba Razmimanesh
- Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Avenue, Tehran, Iran
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20
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Wang R, Wu X, Yan X, He G, Hu Z. Proton conductivity enhancement of SPEEK membrane through n-BuOH assisted self-organization. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2014.12.054] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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22
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Vishnyakov A, Neimark AV. Self-assembly in Nafion membranes upon hydration: water mobility and adsorption isotherms. J Phys Chem B 2014; 118:11353-64. [PMID: 25157931 DOI: 10.1021/jp504975u] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
By means of dissipative particle dynamics (DPD) and Monte Carlo (MC) simulations, we explored geometrical, transport, and sorption properties of hydrated Nafion-type polyelectrolyte membranes. Composed of a perfluorinated backbone with sulfonate side chains, Nafion self-assembles upon hydration and segregates into interpenetrating hydrophilic and hydrophobic subphases. This segregated morphology determines the transport properties of Nafion membranes that are widely used as compartment separators in fuel cells and other electrochemical devices, as well as permselective diffusion barriers in protective fabrics. We introduced a coarse-grained model of Nafion, which accounts explicitly for polymer rigidity and electrostatic interactions between anionic side chains and hydrated metal cations. In a series of DPD simulations with increasing content of water, a classical percolation transition from a system of isolated water clusters to a 3D network of hydrophilic channels was observed. The hydrophilic subphase connectivity and water diffusion were studied by constructing digitized replicas of self-assembled morphologies and performing random walk simulations. A non-monotonic dependence of the tracer diffusivity on the water content was found. This unexpected behavior was explained by the formation of large and mostly isolated water domains detected at high water content and high equivalent polymer weight. Using MC simulations, we calculated the chemical potential of water in the hydrated polymer and constructed the water sorption isotherms, which extended to the oversaturated conditions. We determined that the maximum diffusivity and the onset of formation of large water domains corresponded to the saturation conditions at 100% humidity. The oversaturated membrane morphologies generated in the canonical ensemble DPD simulations correspond to the metastable and unstable states of Nafion membrane that are not realized in the experiments.
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Affiliation(s)
- Aleksey Vishnyakov
- Department of Chemical Engineering, Rutgers, the State University of New Jersey , 98 Brett Road, Piscataway, New Jersey 08854, United States
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23
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Pandav G, Ganesan V. Computer Simulations of Dendrimer–Polyelectrolyte Complexes. J Phys Chem B 2014; 118:10297-310. [DOI: 10.1021/jp505645r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Gunja Pandav
- Department
of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Venkat Ganesan
- Department of Chemical Engineering and Institute for
Computational and Engineering Sciences, University of Texas at Austin, Austin, Texas 78712, United States
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Wu H, Cao Y, Shen X, Li Z, Xu T, Jiang Z. Preparation and performance of different amino acids functionalized titania-embedded sulfonated poly (ether ether ketone) hybrid membranes for direct methanol fuel cells. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.03.058] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Komarov PV, Veselov IN, Khalatur PG. Self-organization of amphiphilic block copolymers in the presence of water: A mesoscale simulation. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.05.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Conductometric and computational study of cationic polymer membranes in H+ and Na+-forms at various hydration levels. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2013.05.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mahajan CV, Ganesan V. Influence of Hydrogen Bonding Effects on Methanol and Water Diffusivities in Acid–Base Polymer Blend Membranes of Sulfonated Poly(ether ether ketone) and Base Tethered Polysulfone. J Phys Chem B 2013; 117:5315-29. [DOI: 10.1021/jp3121512] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Chetan V. Mahajan
- Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Venkat Ganesan
- Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States
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28
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Understanding structure and transport characteristics in hydrated sulfonated poly(ether ether ketone)–sulfonated poly(ether sulfone) blend membranes using molecular dynamics simulations. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2012.11.033] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Woudstra JM, Ooms KJ. Investigating the Water in Hydrated sPEEK Membranes Using Multiple Quantum Filtered 2H NMR Spectroscopy. J Phys Chem B 2012; 116:14724-30. [DOI: 10.1021/jp309986x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Joel M. Woudstra
- Department
of Chemistry, The King’s University College, 9125-50 St. Edmonton,
Alberta, Canada T6B 2H3
| | - Kristopher J. Ooms
- Department
of Chemistry, The King’s University College, 9125-50 St. Edmonton,
Alberta, Canada T6B 2H3
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30
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Mahajan CV, Ganesan V. Correction to “Atomistic Simulations of Structure of Solvated Sulfonated Poly(ether ether ketone) Membranes and Their Comparisons to Nafion: I. Nanophase Segregation and Hydrophilic Domains”. J Phys Chem B 2012. [DOI: 10.1021/jp3033929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chetan V. Mahajan
- Department of Chemical
Engineering, University of Texas at Austin, Austin,
Texas 78712, United States
| | - Venkat Ganesan
- Department of Chemical
Engineering, University of Texas at Austin, Austin,
Texas 78712, United States
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31
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Doi K, Kato K, Kawano S. Characterization of polymer structures based on Burnside's lemma. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 84:011805. [PMID: 21867203 DOI: 10.1103/physreve.84.011805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Indexed: 05/31/2023]
Abstract
Polymer structure modeling is a trend of recent material sciences. Developments of computational science and nanotechnology make it possible to predict properties of complicated molecular structures. Many theoretical and computational methods have succeeded in elucidating the nature of polymer structures. It is not always best to model whole complicated structures depending on computer capabilities. Significant properties of materials may be manifested in simple structural aspects. In the present study, characteristics of a polymer structure are investigated by applying Burnside's lemma to the modeling procedure. This method is expected to be available to model polymers or molecular crystals in which functional groups play an important role in expressing their functions. Every structure under the symmetry and periodicity is counted completely and the energy distribution caused by the conformations of functional groups can be clarified. The detailed procedure is introduced and the present method is applied to a problem for investigating molecular structures of sulfonated poly(ether ether ketone) (SPEEK). SPEEK is focused on a candidate for proton exchange membranes in polymer electrolyte fuel cells. Sulfonic groups have a significant role in proton exchange membranes to make proton conduction channels. From our analysis, it is found that sulfonic groups tend to be dispersed in SPEEK membranes at their stable conditions. These are unfavorable characteristics for proton exchange membranes due to their difficulty to form desirable water channels inevitable for the high proton conductivity. This is one reason why SPEEK membranes are inferior to Nafion® membranes that express the highest performance as proton exchange membranes. Using the present method, experimental and theoretical results previously reported are confirmed and detailed characteristics are discussed in terms of structural simplicities.
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Affiliation(s)
- Kentaro Doi
- Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
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Affiliation(s)
- Shulu Feng
- Department of Chemistry, James Franck Institute and Computational Institute, University of Chicago, 5735 S Ellis Ave., Chicago, Illinois 60637, United States
| | - Gregory A. Voth
- Department of Chemistry, James Franck Institute and Computational Institute, University of Chicago, 5735 S Ellis Ave., Chicago, Illinois 60637, United States
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Idupulapati N, Devanathan R, Dupuis M. Atomistic Simulations of Perfluoro Phosphonic and Phosphinic Acid Membranes and Comparisons to Nafion. J Phys Chem B 2011; 115:2959-69. [DOI: 10.1021/jp111972h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Nagesh Idupulapati
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Ram Devanathan
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Michel Dupuis
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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34
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Esai Selvan M, Calvo-Muñoz E, Keffer DJ. Toward a Predictive Understanding of Water and Charge Transport in Proton Exchange Membranes. J Phys Chem B 2011; 115:3052-61. [DOI: 10.1021/jp1115004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Myvizhi Esai Selvan
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996-2200, United States
| | - Elisa Calvo-Muñoz
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996-2200, United States
| | - David J. Keffer
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996-2200, United States
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Republic of Korea
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35
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Lins RD, Devanathan R, Dupuis M. Modeling the Nanophase Structural Dynamics of Phenylated Sulfonated Poly Ether Ether Ketone Ketone (Ph-SPEEKK) Membranes As a Function of Hydration. J Phys Chem B 2011; 115:1817-24. [DOI: 10.1021/jp110331m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roberto D. Lins
- Department of Fundamental Chemistry, Federal University of Pernambuco (UFPE), Recife, PE, 50740-540, Brazil
| | - Ram Devanathan
- Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Michel Dupuis
- Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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