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Hossain MM, Karim MM, Seo KD, Park DS, Shim YB. Capillary and Electrodynamic Forces-Driven Separation Detection of Metal Ions Using a Disposable Microfluidic Sensor with a Composite Electrode. Anal Chem 2023; 95:16701-16709. [PMID: 37922203 DOI: 10.1021/acs.analchem.3c03518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2023]
Abstract
A disposable microfluidic channel sensor printed on a plastic platform was developed to analyze heavy metal ions (HMIs) as a model target species. Precise separation and detection of multiple targets were established by symmetrically applying a small AC potential on the carbon channel walls to induce an electrodynamic force. The separation device was constructed by covering it with a plastic lid to achieve capillary action in the channel. The sample flow rate was regulated by the hydrophilicity of the lid plastic and electrodynamic convection by the AC field, which was characterized by the contact angle measurement and the additional electrodynamic force. The flow variables and their relevance to the capillary phenomena were demonstrated, and the analytical parameters were optimized. The working electrode was modified with poly(diamino terthiophene) anchored with nanosized graphene oxide (pDATT/GO) to enhance the detection performance. The experimental variables for separating and detecting the target species were optimized according to the AC frequency and amplitude, sample flow rate, electrolytes, pH, temperature, and applied potential for detection. The linear dynamic ranges were between 0.1 and 200.0 ppb, with detection limits of 0.04 ± 0.023, 0.29 ± 0.05, 0.07 ± 0.011, and 0.14 ± 0.06 ppb for Cu2+ Cd2+, Hg2+, and Pb2+, respectively. Finally, the reliability of the proposed method was evaluated through analysis of HMIs in real water samples. The results were matched to those obtained through parallel analysis using ICP-MS at a 95% confidence level.
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Affiliation(s)
- Mozammal Md Hossain
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Md Mobarok Karim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Kyeong-Deok Seo
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Deog-Su Park
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Yoon-Bo Shim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
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Hassan RU, Khalil SM, Khan SA, Moon J, Cho DH, Byun D. Electric field and viscous fluid polarity effects on capillary-driven flow dynamics between parallel plates. Heliyon 2023; 9:e16395. [PMID: 37251468 PMCID: PMC10220362 DOI: 10.1016/j.heliyon.2023.e16395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 05/12/2023] [Accepted: 05/15/2023] [Indexed: 05/31/2023] Open
Abstract
-Micropumps have attracted considerable interest in micro-electro-mechanical systems (MEMS), microfluidic devices, and biomedical engineering to transfer fluids through capillaries. However, improving the sluggish capillary-driven flow of highly viscous fluids is critical for commercializing MEMS devices, particularly in underfill applications. This study investigated the behavior of different viscous fluid flows under the influence of capillary and electric potential effects. We observed that upon increasing the electric potential to 500 V, the underfill flow length of viscous fluids increased by 45% compared to their capillary flow length. To explore the dynamics of underfill flow under the influence of an electric potential, the polarity of highly viscous fluids was altered by adding NaCl. The results indicated an increase of 20-41% in the underfill flow length of highly viscous conductive fluids (0.5-4% NaCl additives in glycerol) at 500 V compared to that at 0 V. The underfill viscous fluid flow length improved under the electric potential effect owing to the polarity across the substance and increased permittivity of the fluid. A time-dependent simulation, which included a quasi-electrostatic module, level set module, and laminar two-phase flow, was executed using the COMSOL Multiphysics software to analyze the effect of the external electric field on the capillary-driven flow. The numerical simulation results agreed well with the experimental data, with an average deviation of 4-7% at various time steps for different viscous fluids. Our findings demonstrate the potential of utilizing electric fields to control the capillary-driven flow of highly viscous fluids in underfill applications.
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Affiliation(s)
- Rizwan Ul Hassan
- Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | | | - Saeed Ahmed Khan
- Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Pakistan
| | - Joonkyeong Moon
- Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Dae-Hyun Cho
- Department of Mechatronics Engineering, Gyeongsang National University, 33 Dongjin-ro, Jinju, Gyeongsangnam-do, 52725, Republic of Korea
- Department of Energy System Engineering, Gyeongsang National University, 501 Jinjudae-ro, Jinju, Gyeongsangnam-do, 52828, Republic of Korea
| | - Doyoung Byun
- Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
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Karna NK, Wohlert J, Hjorth A, Theliander H. Capillary forces exerted by a water bridge on cellulose nanocrystals: the effect of an external electric field. Phys Chem Chem Phys 2023; 25:6326-6332. [PMID: 36779301 DOI: 10.1039/d2cp05563e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Capillary forces play an important role during the dewatering and drying of nanocellulosic materials. Traditional moisture removal techniques, such as heating, have been proved to be deterimental to the properties of these materials and hence, there is a need to develop novel dewatering techniques without affecting the desired properties of materials. It is, therefore, important to explore novel methods for dewatering these high-added-value materials without negatively influencing their properties. In this context, we explore the effect of electric field on the capillary forces developed by a liquid-water bridge between two cellulosic surfaces, which may be formed during the water removal process following its displacement from the interfibrillar spaces. All-atom molecular dynamics (MD) simulations have been used to study the influence of an externally applied electric field on the capillary force exerted by a water bridge. Our results suggest that the equilibrium contact angle of water and the capillary force exerted by the water bridge between two nanocellulosic surfaces depend on the magnitude and direction of the externally applied electric fields. Hence, an external electric field can be applied to manipulate the capillary forces between two particles. The close agreement between the capillary forces measured through MD simulations and those calculated through classical equations indicates that, within the range of the electric field applied in this study, Young-Laplace equations can be safely employed to predict the capillary forces between two particles. The present study provides insights into the use of electric fields for drying of nanocellulosic materials.
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Affiliation(s)
- Nabin Kumar Karna
- Chalmers University of Technology, Chalmersplatsen-4, Sweden. .,Wallenberg Wood Science Center, The Royal Institute of Technology, Chalmers University of Technology and Linköping University, SE-10044 Stockholm, Sweden
| | - Jakob Wohlert
- Wallenberg Wood Science Center, The Royal Institute of Technology, Chalmers University of Technology and Linköping University, SE-10044 Stockholm, Sweden.,KTH Royal Institute of Technology, Stockholm, Sweden
| | - Anna Hjorth
- Chalmers University of Technology, Chalmersplatsen-4, Sweden. .,Wallenberg Wood Science Center, The Royal Institute of Technology, Chalmers University of Technology and Linköping University, SE-10044 Stockholm, Sweden
| | - Hans Theliander
- Chalmers University of Technology, Chalmersplatsen-4, Sweden.
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Situ W, Zambrano HA, Walther JH. The effect of air solubility on the Kapitza resistance of the copper-water interface. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Rojano AE, Córdoba A, Walther JH, Zambrano HA. Effect of charge inversion on nanoconfined flow of multivalent ionic solutions. Phys Chem Chem Phys 2022; 24:4935-4943. [DOI: 10.1039/d1cp02102h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comprehensive understanding of fluid dynamics of dilute electrolyte solutions in nanoconfinement is essential to develop more efficient nanofluidic devices. In nanoconduits, the electrical double layer can occupy a considerable...
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He X, Wang YF, Zhang BX, Wang SL, Yang YR, Wang XD, Lee DJ. Effects of Nanodroplet Sizes on Wettability, Electrowetting Transition, and Spontaneous Dewetting Transition on Nanopillar-Arrayed Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:14571-14581. [PMID: 34894696 DOI: 10.1021/acs.langmuir.1c01807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In this study, the wetting and dewetting behaviors of water nanodroplets containing various molecule numbers on nanopillar-arrayed surfaces in the presence or absence of an external electric field are investigated via molecular dynamics (MD) simulations, aiming to examine whether there is a scale effect. The results show that, in the absence of an electric field, nanodroplets on coexisting Cassie/Wenzel surfaces may be in the Cassie or the Wenzel state depending on their initial states, and apparent contact angles of the Cassie or Wenzel nanodroplets increase monotonously with increasing the droplet size. Energy analysis shows that on the same coexisting Cassie/Wenzel surface, when an electric field is imposed, a small nanodroplet possesses a lower energy barrier separating the Cassie state from the Wenzel state. Therefore, the small nanodroplet is easier to collapse into the Wenzel state. Moreover, the spontaneous Wenzel-to-Cassie dewetting transition is not observed for the nanodroplets after the removal of the electric field because the Wenzel state is a globally stable energetic state. With the same pillar geometry, both the wetting transition and the dewetting transition are significantly modified for liquids with higher intrinsic contact angles. The energy barrier of the wetting transition increases for both the large and small nanodroplets, meaning that the Cassie state becomes more robust. The energy curve shows that the Wenzel state of the large nanodroplet has higher energy so that the droplet can return to the Cassie state when removing the electric field. Intriguingly, although the small Wenzel nanodroplet has lower energy in the presence of the electric field, the dewetting transition still occurs. The increased solid-liquid interfacial tension when removing the electric field is responsible for this abnormal result. The wetting and dewetting transitions follow different energy pathways, leading to a hysteresis energy loop. There exists a critical water molecule number separating the unstable/stable Wenzel configurations, above which the Cassie state is energetically favorable and the dewetting transition can occur spontaneously after removing the electric field.
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Affiliation(s)
- Xin He
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
| | - Yi-Feng Wang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
| | - Ben-Xi Zhang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
| | - Shuo-Lin Wang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
| | - Yan-Ru Yang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
| | - Xiao-Dong Wang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing 102206, China
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
- Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong, Kowloon 999077, Hong Kong
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7
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Bonakala S, Hasan MI. Comparative study of external electric field and potential effects on liquid water ions. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1998689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Satyanarayana Bonakala
- Department of Electrical Engineering and Electronics, Centre for Plasma Microbiology, University of Liverpool, Liverpool, UK
| | - Mohammad I. Hasan
- Department of Electrical Engineering and Electronics, Centre for Plasma Microbiology, University of Liverpool, Liverpool, UK
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8
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Karna NK, Wohlert J, Lidén A, Mattsson T, Theliander H. Wettability of cellulose surfaces under the influence of an external electric field. J Colloid Interface Sci 2021; 589:347-355. [PMID: 33476890 DOI: 10.1016/j.jcis.2021.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/12/2020] [Accepted: 01/01/2021] [Indexed: 11/15/2022]
Abstract
HYPOTHESIS Interfacial tensions play an important role in dewatering of hydrophilic materials like nanofibrillated cellulose, and are affected by the molecular organization of water at the interface. Application of an electric field influences the orientation of water molecules along the field direction. Hence, it should be possible to alter the interfacial free energies to tune the wettability of cellulose surface through application of an external electric field thus, aiding the dewatering process. SIMULATIONS Molecular dynamics simulations of cellulose surface in contact with water under the influence of an external electric field have been conducted with GLYCAM-06 forcefield. The effect of variation in electric field intensity and directions on the spreading coefficient has been addressed via orientational preference of water molecules and interfacial free energy analyses. FINDINGS The application of electric field influences the interfacial free energy difference at the cellulose-water interface. The spreading coefficient increases with the electric field directed parallel to the cellulose-water interface while it decreases in the perpendicular electric field. Variation in interfacial free energies seems to explain the change in contact angle adequately in presence of an electric field. The wettability of cellulose surface can be tuned by the application of an external electric field.
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Affiliation(s)
- Nabin Kumar Karna
- Division of Forest Products and Chemical Engineering, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, 412 96 Göteborg, Sweden; Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-10044, Sweden.
| | - Jakob Wohlert
- Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-10044, Sweden; Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-10044, Sweden.
| | - Anna Lidén
- Division of Forest Products and Chemical Engineering, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, 412 96 Göteborg, Sweden.
| | - Tuve Mattsson
- Division of Forest Products and Chemical Engineering, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, 412 96 Göteborg, Sweden; Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-10044, Sweden.
| | - Hans Theliander
- Division of Forest Products and Chemical Engineering, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, 412 96 Göteborg, Sweden; Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-10044, Sweden.
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9
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Zhang W, Ning Z, Cheng Z, Wang Q, Wu X, Huang L. Experimental Investigation of the Role of DC Voltage in the Wettability Alteration in Tight Sandstones. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11985-11995. [PMID: 32957786 DOI: 10.1021/acs.langmuir.0c02171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The usage of direct current (DC) voltage has enormous potential for oil fields due to the effect of wettability alteration. However, the unclear mechanism of the wettability alteration has limited the application of this technology to oil fields. In this study, chemical and physical methods including contact angle tests, Fourier-transform infrared spectroscopy (FTIR) measurements, and atomic force microscope (AFM) experiments were combined to investigate the wettability alteration mechanism for tight sandstones subjected to DC voltage treatment. From the view of a chemical factor, FTIR results show that DC voltage decreases the number of Si-O-Si, C-O-C, C-O, and COOH groups, while it also increases the number of C═O and OH groups. The changes in molecular groups further improve the water-wetting property of tight sandstones. On the other hand, in a physical way, AFM results indicate that DC voltage improves the roughness of the rock surface. At the same time, the wetting state transfers from the Cassie-Baxter to the Wenzel. This increases the contact area of the solid-liquid interface. The augment of roughness and the transfer of the wetting state improve the water-wetting property of tight sandstones. By comparing the influences of both chemical and physical factors on wettability, it is concluded that although roughness indeed affects the wettability, chemical factors play a dominant role in determining the wettability. Achievements in this study can help researchers and engineers better understand the mechanism of wettability alteration and further accelerate the development of tight sandstones with DC voltage-related technology.
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Affiliation(s)
- Wentong Zhang
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, Beijing 102249, P. R. China
- Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing, Beijing 102249, P. R. China
| | - Zhengfu Ning
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, Beijing 102249, P. R. China
- Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing, Beijing 102249, P. R. China
| | - Zhilin Cheng
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, Beijing 102249, P. R. China
- Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing, Beijing 102249, P. R. China
| | - Qing Wang
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, Beijing 102249, P. R. China
- Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing, Beijing 102249, P. R. China
| | - Xiaojun Wu
- State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, Beijing 102249, P. R. China
- Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing, Beijing 102249, P. R. China
| | - Liang Huang
- College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, P. R. China
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Ostler D, Kannam SK, Frascoli F, Daivis PJ, D Todd B. Inducing a Net Positive Flow of Water in Functionalized Concentric Carbon Nanotubes Using Rotating Electric Fields. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14742-14749. [PMID: 31614091 DOI: 10.1021/acs.langmuir.9b02594] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electropumping has shown great potential as an effective means of inducing a net positive flow of water in confined channels. In this paper we present the first nonequilibrium molecular dynamics study and continuum based numerical solutions that demonstrate an effective net positive flow between concentric carbon nanotubes (CNT) using electropumping. We apply a spatially uniform rotating electric field that couples to the water's permanent dipole moment. Taking advantage of the coupling between the spin angular momentum and the linear momentum we break the symmetry of the channel radius by functionalizing the inner CNT's outer surface with carboxyl groups to induce a net positive flow. We also show that our results for concentric nanotubes are consistent with our previous work where we demonstrated that an increase in functionalization beyond an optimal point in a single walled carbon nanotube resulted in a decrease in positive net flow. We then numerically solve the coupled hydrodynamic momentum equations to show that the nonequilibrium molecular dynamics results are consistent with the continuum theory.
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Affiliation(s)
- David Ostler
- Department of Mathematics, School of Science, Faculty of Science, Engineering and Technology , Swinburne University of Technology , Melbourne , Victoria 3122 , Australia
| | - Sridhar Kumar Kannam
- Department of Mathematics, School of Science, Faculty of Science, Engineering and Technology , Swinburne University of Technology , Melbourne , Victoria 3122 , Australia
| | - Federico Frascoli
- Department of Mathematics, School of Science, Faculty of Science, Engineering and Technology , Swinburne University of Technology , Melbourne , Victoria 3122 , Australia
| | - Peter J Daivis
- School of Science and Centre for Molecular and Nanoscale Physics , RMIT University , Melbourne , Victoria 3001 , Australia
| | - B D Todd
- Department of Mathematics, School of Science, Faculty of Science, Engineering and Technology , Swinburne University of Technology , Melbourne , Victoria 3122 , Australia
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Razmjou A, Eshaghi G, Orooji Y, Hosseini E, Korayem AH, Mohagheghian F, Boroumand Y, Noorbakhsh A, Asadnia M, Chen V. Lithium ion-selective membrane with 2D subnanometer channels. WATER RESEARCH 2019; 159:313-323. [PMID: 31102860 DOI: 10.1016/j.watres.2019.05.018] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 04/30/2019] [Accepted: 05/05/2019] [Indexed: 06/09/2023]
Abstract
In the last two years, the rapidly rising demand for lithium has exceeded supply, resulting in a sharp increase in the price of the metal. Conventional electric driven membrane processes can separate Li+ from divalent cations, but there is virtually no commercial membrane that can efficiently and selectively extract Li+ from a solution containing chemically similar ions such as Na+ and K+. Here, we show that the different movement behavior of Li+ ion within the sub-nanometre channel leads to Li+ ion-selectivity and high transport rate. Using inexpensive negatively charged 2D subnanometer hydrous phyllosilicate channels with interlayer space of 0.43 nm in a membrane-like morphology, we observed that for an interlayer spacing of below 1 nm, Li+ ions move along the length of the channel by jumping between its two walls. However, for above 1 nm spacing, the ions used only one channel wall to jump and travel. Molecular dynamic (MD) simulation also revealed that ions within the nanochannel exhibit acceleration-deceleration behavior. Experimental results showed that the nanochannels could selectively transport monovalent ions of Li+> Na+> and K+ while excluding other ions such as Cl- and Ca2+, with the selectivity ratios of 1.26, 1.59 and 1.36 for Li+/Na+, Li+/K+, and Na+/K+ respectively, which far exceed the mobility ratios in traditional porous ion exchange membranes. The findings of this work provide researchers with not only a new understanding of ions movement behavior within subnanometer confined areas but also make a platform for the future design of ion-selective membranes.
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Affiliation(s)
- Amir Razmjou
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, 73441-81746, Iran; UNESCO Centre for Membrane Science and Technology, School of Chemical Science and Engineering, University of New South Wales, Sydney, 2052, Australia.
| | - Ghazaleh Eshaghi
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, 73441-81746, Iran
| | - Yasin Orooji
- College of Materials Science and Engineering, Nanjing Forestry University, No. 158, Longpan Road, Nanjing, 210037, Jiangsu, People's Republic of China
| | - Ehsan Hosseini
- School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
| | | | - Fereshteh Mohagheghian
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, 73441-81746, Iran
| | - Yasaman Boroumand
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, 73441-81746, Iran
| | - Abdollah Noorbakhsh
- Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, 73441-81746, Iran
| | - Mohsen Asadnia
- School of Engineering, Macquarie University, Sydney, New South Wales, 2109, Australia
| | - Vicki Chen
- School of Chemical Engineering, University of Queensland, St. Lucia, 4072, Australia; UNESCO Centre for Membrane Science and Technology, School of Chemical Science and Engineering, University of New South Wales, Sydney, 2052, Australia
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Liao B, Qiu L, Wang D, Bao W, Wei Y, Wang Y. The behaviour of water on the surface of kaolinite with an oscillating electric field. RSC Adv 2019; 9:21793-21803. [PMID: 35518887 PMCID: PMC9066472 DOI: 10.1039/c9ra04269e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 07/09/2019] [Indexed: 12/01/2022] Open
Abstract
A quantitative understanding of oscillating electric field effects on the behaviour of water on the surface of kaolinite is vital for research in the field of clay–water systems. The behaviour of water molecules on the (0 0 1) and (0 0 −1) surfaces of kaolinite are systematically investigated in the absence or presence of an oscillating electric field using molecular dynamics simulations. The simulated results demonstrate that the applied oscillating electric fields parallel to kaolinite surface contribute to decreased amounts of adsorbed water molecules on the (0 0 1) surface of kaolinite. The oscillating electric field performs an inconspicuous effect on the adsorption of water on the (0 0 −1) surface of kaolinite. The behaviour of water on the surface of kaolinite will be impacted more severely by oscillating electric fields. Our results demonstrate that water molecules will rotate following the directions of the applied fields, which causes the decrease of hydrogen bonds, and thus, the weaker water–kaolinite interactions due to the applied field drive water molecules away from kaolinite surfaces. These results are of significance to understand the mechanisms of the oscillating electric fields affecting the behaviour of clay–water systems. A quantitative understanding of oscillating electric field effects on the behaviour of water on the surface of kaolinite is vital for research in the field of clay–water systems.![]()
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Affiliation(s)
- Bo Liao
- School of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Li Qiu
- School of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Diansheng Wang
- School of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Wancheng Bao
- School of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Yupeng Wei
- School of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Yudou Wang
- School of Science
- China University of Petroleum
- Qingdao 266580
- China
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13
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Wang M, Shen W, Ding S, Wang X, Wang Z, Wang Y, Liu F. A coupled effect of dehydration and electrostatic interactions on selective ion transport through charged nanochannels. NANOSCALE 2018; 10:18821-18828. [PMID: 30277244 DOI: 10.1039/c8nr04962a] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Selective ion transport is an essential feature of biological ion channels. Due to the subnanometer size and negatively charged surface of ion channels, the ion selectivity is affected by both dehydration effects and electrostatic interactions. Their coupled effect on selective ion transport, however, has been elusive. Here, using molecular dynamics simulations, we study ion (Li+ and Mg2+) transport through subnanometer carbon nanotubes (CNTs) with varying charge densities. Our results indicate that the dehydration effect governs the ionic transport at low surface charge densities, hence the nanochannel shows a selectivity for Li+ ions. In contrast, the nanochannel switches to a selectivity for Mg2+ ions as the electrostatic interaction between the cations and the negatively charged wall dominates the transport at high surface charge densities.
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Affiliation(s)
- Mao Wang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
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