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Mitra S, Basak M. Nonequilibrium Dynamics of Transient Autoelectrophoresis and Effect of Surface Heterogeneity. J Phys Chem B 2023; 127:2034-2043. [PMID: 36853743 DOI: 10.1021/acs.jpcb.2c09119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Nonuniform proton flux around a reactive Janus particle as a result of zone selective heterogeneous surface reaction leads to the formation of asymmetric electrical double layers (EDLs) which assists in generating a proximate electric field dipole around the Janus particle to initiate autoelectrophoretic migration. To estimate the force of the autoelectrophoretic motion of such Janus particles, a mathematical model is set up taking Poisson-Nernst-Plank (PNP) equations coupled with the Navier-Stokes (NS) equations with appropriate boundary conditions. To track the actual motion of these particles, we employ moving deforming mesh and fluid-structure interactions (fsi) of COMSOL Multiphysics while a finite element method is deployed for solving the set of modeled equations. At the outset, transient genesis of the electric field around the particle owing to the nonuniform proton flux has been explored. We further explore the detailed unsteady particle dynamics of the autoelectrophoretic motion with the help of fluid structure interaction physics. It has been observed that the concept of perfect ionic equilibrium in autoelectrophoretic motion is hard to achieve. The autoelectrophoretic particle undergoes continuous change in terms of the ionic concentration around it, speed of the particle, and the transient electric field gradient across the particle. The parametric variation of proton flux reveals that at a relatively lower proton flux a quasi-equilibrium state can be achieved, whereas for higher proton flux the phenomenon can be a pure nonequilibrium case. This parametric study has been done to support the transient dynamics. It has also been shown that the presence of chemical heterogeneity on the particle surface can alter the dynamics of the particle significantly, and the chemical heterogeneity can be used as a tool to control directionality and tuning speed of autoelectrophoretic motion.
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Affiliation(s)
- Shirsendu Mitra
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India.,Pioneer of Success Online Educational Institute, Halisahar 743134, West Bengal, India
| | - Mitali Basak
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.,Pioneer of Success Online Educational Institute, Halisahar 743134, West Bengal, India
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Wangpraseurt D, You S, Sun Y, Chen S. Biomimetic 3D living materials powered by microorganisms. Trends Biotechnol 2022; 40:843-857. [DOI: 10.1016/j.tibtech.2022.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 12/14/2022]
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Li Z, Xie Z, Lu H, Wang Y, Liu Y. Cargo Transportation and Methylene Blue Degradation by Using Fuel-Powered Micromotors. ChemistryOpen 2021; 10:861-866. [PMID: 34346565 PMCID: PMC8409089 DOI: 10.1002/open.202100064] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 06/07/2021] [Indexed: 11/17/2022] Open
Abstract
In the past two decades, micromotors have experienced rapid development, especially in environmental remediation, the biomedical field, and in cargo delivery. In this study micromotors have been synthesized from a variety of materials. Different functional layers and catalytic layers are formed through template electrodeposition (the bottom-up method). At the same time, the article analyzes the influence of hydrogen peroxide concentration, surfactant type and concentration on the speed of the micromotors. Cargo transportation through tubular micromotors has always been a problem that people are eager to solve. In this article, we electrodeposit a layer of Ni in the microtubes, which effectively guides the microtubular motors to complete the cargo transportation. The potential applications of micromotors are also being explored. We added the prepared micromotors to the methylene blue solution to effectively enhance the degradation.
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Affiliation(s)
- Zhonghao Li
- Department of Physics and MathematicsShanghai Key Laboratory of Materials Protection andAdvanced Materials in Electric PowerShanghai University of Electric PowerShanghai201300China
| | - Zhongzhou Xie
- Department of Physics and MathematicsShanghai Key Laboratory of Materials Protection andAdvanced Materials in Electric PowerShanghai University of Electric PowerShanghai201300China
| | - Hao Lu
- Department of Physics and MathematicsShanghai Key Laboratory of Materials Protection andAdvanced Materials in Electric PowerShanghai University of Electric PowerShanghai201300China
| | - Ying Wang
- Department of Physics and MathematicsShanghai Key Laboratory of Materials Protection andAdvanced Materials in Electric PowerShanghai University of Electric PowerShanghai201300China
- Department of Materials ScienceFudan UniversityShanghai200433China
| | - Yongsheng Liu
- Department of Physics and MathematicsShanghai Key Laboratory of Materials Protection andAdvanced Materials in Electric PowerShanghai University of Electric PowerShanghai201300China
- Department of Materials ScienceFudan UniversityShanghai200433China
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Khezri B, Villa K, Novotný F, Sofer Z, Pumera M. Smartdust 3D-Printed Graphene-Based Al/Ga Robots for Photocatalytic Degradation of Explosives. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2002111. [PMID: 32633050 DOI: 10.1002/smll.202002111] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/25/2020] [Indexed: 06/11/2023]
Abstract
Milli/micro/nanorobots are considered smart devices able to convert energy taken from different sources into mechanical movement and accomplish the appointed tasks. Future advances and realization of these tiny devices are mostly limited by the narrow window of material choices, the fuel requirement, multistep surface functionalization, rational structural design, and propulsion ability in complex environments. All these aspects call for intensive improvements that may speed up the real application of such miniaturized robots. 3D-printed graphene-based smartdust robots provided with a magnetic response and filled with aluminum/gallium molten alloy (Al/Ga) for autonomous motion are presented. These robots can swim by reacting with the surrounding environment without adding any fuel. Because their outer surface is coated with a hydrogel/photocatalyst (chitosan/carbon nitride, C3 N4 ) layer, these robots are used for the photocatalytic degradation of the picric acid as an explosive model molecule under visible light. The results show a fast and efficient degradation of picric acid that is attributed to a synergistic effect between the adsorption capability of the chitosan and the photocatalytic activity of C3 N4 particles. This work provides added insight into the large-scale fabrication, easy functionalization, and propulsion of tiny robots for environmental applications.
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Affiliation(s)
- Bahareh Khezri
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Praha 6, Prague, 16822, Czech Republic
| | - Katherine Villa
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Praha 6, Prague, 16822, Czech Republic
| | - Filip Novotný
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Praha 6, Prague, 16822, Czech Republic
| | - Zdeněk Sofer
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Praha 6, Prague, 16822, Czech Republic
| | - Martin Pumera
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Praha 6, Prague, 16822, Czech Republic
- Department of Medical Research, China Medical University Hospital, China Medical University, No. 91 Hsueh-Shih Road, Taichung, Taiwan
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Korea
- Future Energy and Innovation Laboratory, Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, Brno, CZ-61600, Czech Republic
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Ying Y, Pumera M. Micro/Nanomotors for Water Purification. Chemistry 2018; 25:106-121. [DOI: 10.1002/chem.201804189] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 10/02/2018] [Indexed: 12/19/2022]
Affiliation(s)
- Yulong Ying
- Center for Advanced Functional NanorobotsDepartment of Inorganic ChemistryUniversity of Chemistry and Technology Prague Technická 5 16628 Prague 6 Czech Republic
| | - Martin Pumera
- Center for Advanced Functional NanorobotsDepartment of Inorganic ChemistryUniversity of Chemistry and Technology Prague Technická 5 16628 Prague 6 Czech Republic
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