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Devi P, Verma R, Singh JP. Advancement in electrochemical, photocatalytic, and photoelectrochemical CO2 reduction: Recent progress in the role of oxygen vacancies in catalyst design. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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Lin N, Valiei A, McKay G, Nguyen D, Tufenkji N, Moraes C. Microfluidic Study of Bacterial Attachment on and Detachment from Zinc Oxide Nanopillars. ACS Biomater Sci Eng 2022; 8:3122-3131. [PMID: 35678761 DOI: 10.1021/acsbiomaterials.2c00233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nanopillars can influence how bacterial cells attach to a surface. Herein, we investigated whether self-assembled zinc oxide (ZnO) nanopillars synthesized on glass substrates via the conventional hydrothermal route possess anti-biofouling properties either by reducing the amount of initially attached cells or promoting the detachment of cells from the surface or both. To avoid complications associated with manual intervention methods of assessing bacterial attachment on nanopillar surfaces, we implemented a microfluidic approach. In our study, we synthesized two nanopillar topographies: a low surface density of ZnO nanopillars and a high surface density of ZnO nanopillars. Next, we mounted microfluidic channels to each of these substrates. This microfluidic approach allowed us to gently flow Pseudomonas aeruginosa, Staphylococcus aureus, or Bacillus subtilis cells onto the nanopillars for initial attachment before systematically increasing the flowrate to attempt to detach remaining attached cells without introducing air-liquid interface artefacts during the assay. Generally, initial bacterial attachment was similar across all substrates. However, cells consistently detached more readily from high-surface-density nanopillars compared to low-surface-density nanopillars. Electron microscopy revealed that cells that attached to high-surface-density nanopillars rested atop the nanopillars, fully exposed to microfluidic shear, whereas many cells became trapped in the void space between neighboring low-surface-density nanopillars, shielding these cells from detachment. Our findings indicate that self-assembled ZnO nanopillars can provide anti-biofouling properties under submerged flow but only if synthesized at high surface density.
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Affiliation(s)
- Nicholas Lin
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, Québec, Canada H3A 0C5
| | - Amin Valiei
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, Québec, Canada H3A 0C5
| | - Geoffrey McKay
- Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, 1001 Décarie Boulevard, Montréal, Québec, Canada H4A 3J1
| | - Dao Nguyen
- Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, 1001 Décarie Boulevard, Montréal, Québec, Canada H4A 3J1.,Department of Microbiology and Immunology, McGill University, 3775 University Street, Montréal, Québec, Canada H3A 2B4.,Department of Medicine, McGill University, 1001 Décarie Boulevard, Montréal, Québec, Canada H4A 3J1
| | - Nathalie Tufenkji
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, Québec, Canada H3A 0C5
| | - Christopher Moraes
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, Québec, Canada H3A 0C5.,Department of Biomedical Engineering, McGill University, 3775 University Street, Montréal, Québec, Canada H3A 2B4.,Rosalind and Morris Goodman Cancer Research Center, McGill University, 1160 Pine Avenue West, Montréal, Québec, Canada H3A 1A3.,Division of Experimental Medicine, McGill University, 1001 Décarie Boulevard, Montréal, Québec, Canada H4A 3J1
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3
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Chatterjee S, Das P, Giri PK, Manju U, Besra L, Basu S. Alteration of Wettability of Copper-Copper Oxide Nanocomposites through Cu-O Bond Breaking Swayed by Ultraviolet and Electron Irradiation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3299-3308. [PMID: 33711234 DOI: 10.1021/acs.langmuir.0c03180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Converting a nonwetting surface to a highly wetting one, aided by ultraviolet radiation, is well explored. Here, in this work, we show just the reverse behavior of a copper-copper oxide nanocomposite surface where ultraviolet radiation turned the superhydrophilic surface to a superhydrophobic one. This observation is explained both experimentally and theoretically using first-principles density functional theory-based calculations considering the metal-oxygen (Cu-O) bond breaking and related change in surface chemistry. This observation has further been corroborated with electron irradiation on the same nanocomposite material. To the best of our knowledge, for the first time, we show that the radiation-induced breaking of the copper-oxygen bond makes the nanostructure surface energetically unfavorable for water adsorption.
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Affiliation(s)
- Sriparna Chatterjee
- CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, Odisha, India
| | - Pritam Das
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Jatni 752050, Odisha, India
| | - Pratibha K Giri
- Department of Chemistry, College of Engineering and Technology, Bhubaneswar 751003, Odisha, India
| | - Unnikrishnan Manju
- CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, Odisha, India
| | - Laxmidhar Besra
- CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, Odisha, India
| | - Suddhasatwa Basu
- CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, Odisha, India
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Wang J, Zhang J, Pei X, Liu S, Ning F, Li Y, Wang C. Synergistic effects of the tip effect and electric adsorption on the enhanced electrowetting-on-dielectric performance of structured ZnO surfaces. CrystEngComm 2020. [DOI: 10.1039/d0ce00047g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
To improve the spreading ability of water droplet on structured surface, the tip effect is proposed to enhance the local electric field near the cone tip under the voltage application, and further increases the horizontal force on the water droplet.
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Affiliation(s)
- Jian Wang
- Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province
- College of Physics and Electronic Engineering
- Northwest Normal University
- Lanzhou
- China
| | - Jianwen Zhang
- Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province
- College of Physics and Electronic Engineering
- Northwest Normal University
- Lanzhou
- China
| | - Xinyu Pei
- Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province
- College of Physics and Electronic Engineering
- Northwest Normal University
- Lanzhou
- China
| | - Shu Liu
- Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province
- College of Physics and Electronic Engineering
- Northwest Normal University
- Lanzhou
- China
| | - Fei Ning
- Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province
- College of Physics and Electronic Engineering
- Northwest Normal University
- Lanzhou
- China
| | - Yan Li
- Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province
- College of Physics and Electronic Engineering
- Northwest Normal University
- Lanzhou
- China
| | - Chengwei Wang
- Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province
- College of Physics and Electronic Engineering
- Northwest Normal University
- Lanzhou
- China
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5
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Qi G, Liu X, Li C, Wang C, Yuan Z. The Origin of Superhydrophobicity for Intrinsically Hydrophilic Metal Oxides: A Preferential O
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Adsorption Dominated by Oxygen Vacancies. Angew Chem Int Ed Engl 2019; 58:17406-17411. [DOI: 10.1002/anie.201909121] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 09/23/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Gaocan Qi
- Tianjin Key Lab for Photoelectric Materials & DevicesSchool of Materials Science and EngineeringTianjin University of Technology Tianjin 300384 China
| | - Xijun Liu
- Center for Electron Microscopy TUT—FEI Joint LaboratoryTianjin University of Technology Tianjin 300384 China
| | - Chao Li
- Center for Electron Microscopy TUT—FEI Joint LaboratoryTianjin University of Technology Tianjin 300384 China
| | - Cheng Wang
- Center for Electron Microscopy TUT—FEI Joint LaboratoryTianjin University of Technology Tianjin 300384 China
| | - Zhihao Yuan
- Tianjin Key Lab for Photoelectric Materials & DevicesSchool of Materials Science and EngineeringTianjin University of Technology Tianjin 300384 China
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6
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Qi G, Liu X, Li C, Wang C, Yuan Z. The Origin of Superhydrophobicity for Intrinsically Hydrophilic Metal Oxides: A Preferential O
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Adsorption Dominated by Oxygen Vacancies. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gaocan Qi
- Tianjin Key Lab for Photoelectric Materials & DevicesSchool of Materials Science and EngineeringTianjin University of Technology Tianjin 300384 China
| | - Xijun Liu
- Center for Electron Microscopy TUT—FEI Joint LaboratoryTianjin University of Technology Tianjin 300384 China
| | - Chao Li
- Center for Electron Microscopy TUT—FEI Joint LaboratoryTianjin University of Technology Tianjin 300384 China
| | - Cheng Wang
- Center for Electron Microscopy TUT—FEI Joint LaboratoryTianjin University of Technology Tianjin 300384 China
| | - Zhihao Yuan
- Tianjin Key Lab for Photoelectric Materials & DevicesSchool of Materials Science and EngineeringTianjin University of Technology Tianjin 300384 China
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Zhang C, Zhai G, Zhang Y, Gao W, Shao Z, Zheng L, Mei F, Zhang H, Yang Y, Li X, Liu X, Xu B. Enhanced device performance and stability of perovskite solar cells with low-temperature ZnO/TiO2 bilayered electron transport layers. RSC Adv 2018; 8:23019-23026. [PMID: 35540162 PMCID: PMC9081582 DOI: 10.1039/c8ra03162b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 06/19/2018] [Indexed: 11/21/2022] Open
Abstract
Low-temperature solution-processed ZnO/TiO2 bilayered films have been demonstrated to be suitable ETLs for highly efficient and stable perovskite solar cells.
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Gahlaut SK, Yadav K, Sharan C, Singh JP. Quick and Selective Dual Mode Detection of H2S Gas by Mobile App Employing Silver Nanorods Array. Anal Chem 2017; 89:13582-13588. [DOI: 10.1021/acs.analchem.7b04064] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Shashank Kumar Gahlaut
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Kavita Yadav
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Chandrashekhar Sharan
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Jitendra Pratap Singh
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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9
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Wei Y, Du H, Kong J, Tran VT, Kai Koh J, Zhao C, He C. Fast light-induced reversible wettability of a zinc oxide nanorod array coated with a thin gold layer. NANOTECHNOLOGY 2017; 28:445404. [PMID: 28799525 DOI: 10.1088/1361-6528/aa85bc] [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
Zinc oxide (ZnO) has gained much attention recently due to its excellent physical and chemical properties, and has been extensively studied in energy harvesting applications such as photovoltaic and piezoelectric devices. In recent years, its reversible wettability has also attracted increasing interest. The wettability of ZnO nanostructures with various morphologies has been studied. However, to the best of our knowledge, there is still a lack of investigations on further modifications on ZnO to provide more benefits than pristine ZnO. Comprehensive studies on the reversible wettability are still needed. In this study, a ZnO nanorod array was prepared via a hydrothermal process and subsequently coated with thin gold layers with varied thickness. The morphologies and structures, optical properties and wettability were investigated. It is revealed that the ZnO-Au system possesses recoverable wettability upon switching between visible-ultraviolet light and a dark environment, which is verified by the contact angle change. The introduction of the thin gold layer to the ZnO nanorod array effectively increases the recovery rate of the wettability. The improvements are attributed to the hierarchical structures, which are formed by depositing thin gold layers onto the ZnO nanorod array, the visible light sensitivity due to the plasmonic effect of the deposited gold, as well as the fast charge-induced surface status change upon light illumination or dark storage. The improvement is beneficial to applications in environmental purification, energy harvesting, micro-lenses, and smart devices.
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Affiliation(s)
- Yuefan Wei
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
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Raturi P, Yadav K, Singh JP. ZnO-Nanowires-Coated Smart Surface Mesh with Reversible Wettability for Efficient On-Demand Oil/Water Separation. ACS APPLIED MATERIALS & INTERFACES 2017; 9:6007-6013. [PMID: 28124893 DOI: 10.1021/acsami.6b14448] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The rapid industrial growth has led to the large production of oily wastewater. Treatment of oily wastewater is an inevitable challenge to manage the greater demand of clean water for the rapidly growing population and economy. In the present work, we have developed a smart surface mesh with reversible wetting properties via a simple, ecofriendly, and scalable approach for on-demand oil-water separation. ZnO nanowires (NWs) obtained from the chemical vapor deposition method were coated on a stainless steel (SS) mesh. The as-synthesized ZnO-NWs-coated mesh shows superhydrophilic/underwater superoleophobic behavior. This mesh works in "water-removing" mode, where the superhydrophilic as well as underwater superoleophobic nature allows the water to permeate easily through the mesh while preventing oil. The wetting property of ZnO-NWs-coated mesh can be switched easily from superhydrophilic to superhydrophobic state and vice versa by simply annealing it at 300 °C alternatively under hydrogen and oxygen environment. The separation is solely driven by gravity. Thus, the reversible wettability of ZnO NWs provides a smart surface mesh which can be switched between "oil-removing" and "water-removing" modes. It was found that for more than 10 cycles of mesh reutilization in both modes alternatively, the separation efficiency of 99.9% stayed relatively invariant, indicating a prolonged antifouling property and excellent recyclability. This work provides a simple, fast, cost-effective, and on-demand solution for oily wastewater treatment and opens up new perspectives in the field of controllable oil-water separation.
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Affiliation(s)
- Parul Raturi
- Department of Physics, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
| | - Kavita Yadav
- Department of Physics, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
| | - J P Singh
- Department of Physics, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
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