1
|
Wang J, Li H, Tavakol M, Serva A, Nener B, Parish G, Salanne M, Warr GG, Voïtchovsky K, Atkin R. Ions Adsorbed at Amorphous Solid/Solution Interfaces Form Wigner Crystal-like Structures. ACS NANO 2024; 18:1181-1194. [PMID: 38117206 DOI: 10.1021/acsnano.3c11349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
When a surface is immersed in a solution, it usually acquires a charge, which attracts counterions and repels co-ions to form an electrical double layer. The ions directly adsorbed to the surface are referred to as the Stern layer. The structure of the Stern layer normal to the interface was described decades ago, but the lateral organization within the Stern layer has received scant attention. This is because instrumental limitations have prevented visualization of the ion arrangements except for atypical, model, crystalline surfaces. Here, we use high-resolution amplitude modulated atomic force microscopy (AFM) to visualize in situ the lateral structure of Stern layer ions adsorbed to polycrystalline gold, and amorphous silica and gallium nitride (GaN). For all three substrates, when the density of ions in the layer exceeds a system-dependent threshold, correlation effects induce the formation of close packed structures akin to Wigner crystals. Depending on the surface and the ions, the Wigner crystal-like structure can be hexagonally close packed, cubic, or worm-like. The influence of the electrolyte concentration, species, and valence, as well as the surface type and charge, on the Stern layer structures is described. When the system parameters are changed to reduce the Stern layer ion surface excess below the threshold value, Wigner crystal-like structures do not form and the Stern layer is unstructured. For gold surfaces, molecular dynamics (MD) simulations reveal that when sufficient potential is applied to the surface, ion clusters form with dimensions similar to the Wigner crystal-like structures in the AFM images. The lateral Stern layer structures presented, and in particular the Wigner crystal-like structures, will influence diverse applications in chemistry, energy storage, environmental science, nanotechnology, biology, and medicine.
Collapse
Affiliation(s)
- Jianan Wang
- School of Molecular Sciences, The University of Western Australia, Perth 6009, Australia
| | - Hua Li
- School of Molecular Sciences, The University of Western Australia, Perth 6009, Australia
- Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth 6009, Australia
| | - Mahdi Tavakol
- Department of Physics, Durham University, Durham DH1 3LE, U.K
| | - Alessandra Serva
- Sorbonne Université, CNRS, Physicochimie des Électrolytes et Nanosystèmes Interfaciaux, PHENIX, Paris F-75005, France
| | - Brett Nener
- School of Engineering, The University of Western Australia, Perth 6009, Australia
| | - Giacinta Parish
- School of Engineering, The University of Western Australia, Perth 6009, Australia
| | - Mathieu Salanne
- Sorbonne Université, CNRS, Physicochimie des Électrolytes et Nanosystèmes Interfaciaux, PHENIX, Paris F-75005, France
| | - Gregory G Warr
- School of Chemistry and Sydney Nano Institute, The University of Sydney, Sydney 2006, Australia
| | | | - Rob Atkin
- School of Molecular Sciences, The University of Western Australia, Perth 6009, Australia
| |
Collapse
|
2
|
Liu Z, Bahadoran A, Alizadeh A, Emami N, Al-Musaw TJ, Alawadi AHR, Aljeboree AM, Shamsborhan M, Najafipour I, Mousavi SE, Mosallanezhad M, Toghraie D. Sonocrystallization of a novel ZIF/zeolite composite adsorbent with high chemical stability for removal of the pharmaceutical pollutant azithromycin from contaminated water. ULTRASONICS SONOCHEMISTRY 2023; 97:106463. [PMID: 37290151 DOI: 10.1016/j.ultsonch.2023.106463] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 05/20/2023] [Accepted: 05/25/2023] [Indexed: 06/10/2023]
Abstract
Water pollution management, reduction, and elimination are critical challenges of the current era that threaten millions of lives. By spreading the coronavirus in December 2019, the use of antibiotics, such as azithromycin increased. This drug was not metabolized, and entered the surface waters. ZIF-8/Zeolit composite was made by the sonochemical method. Furthermore, the effect of pH, the regeneration of adsorbents, kinetics, isotherms, and thermodynamics were attended. The adsorption capacity of zeolite, ZIF-8, and the composite ZIF-8/Zeolite were 22.37, 235.3, and 131 mg/g, respectively. The adsorbent reaches the equilibrium in 60 min, and at pH = 8. The adsorption process was spontaneous, endothermic associated with increased entropy. The results of the experiment were analyzed using Langmuir isotherms and pseudo-second order kinetic models with a R2 of 0.99, and successfully removing the composite by 85% in 10 cycles. It indicated that the maximum amount of drug could be removed with a small amount of composite.
Collapse
Affiliation(s)
- Zhiming Liu
- RENMIN Hospital of Wuhan University, Department of Stomatology, Wuhan, Hubei 430060, China.
| | - Ashkan Bahadoran
- Materials Interfaces Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, Guangdong, China
| | - As'ad Alizadeh
- Department of Civil Engineering, College of Engineering, Cihan University-Erbil, Erbil, Iraq
| | - Nafiseh Emami
- Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran
| | - Tariq J Al-Musaw
- Building and Construction Techniques Engineering Department, Al-Mustaqbal University College, 51001 Hillah, Babylon, Iraq
| | | | - Aseel M Aljeboree
- Department of Chemistry, College of Science for Women, University of Babylon, Hilla, Iraq
| | - Mahmoud Shamsborhan
- Department of Mechanical Engineering, College of Engineering, University of Zakho, Zakho, Iraq
| | - Iman Najafipour
- Department of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Seyed Erfan Mousavi
- Department of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Milad Mosallanezhad
- Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran
| | - Davood Toghraie
- Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr Khomeinishahr, Iran.
| |
Collapse
|
3
|
Wang J, Li H, Li H, Keller S, Mishra UK, Nener BD, Parish G, Atkin R. Effects of surface oxidation on the pH-dependent surface charge of oxidized aluminum gallium nitride. J Colloid Interface Sci 2021; 603:604-614. [PMID: 34217948 DOI: 10.1016/j.jcis.2021.06.126] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 06/10/2021] [Accepted: 06/21/2021] [Indexed: 10/21/2022]
Abstract
HYPOTHESIS The properties of the oxidized surface for common materials, such as silicon and titanium, are known to be markedly different from the reduced surface. We hypothesize that surface-oxidized aluminum gallium nitride ((oxidized-AlGaN)/GaN) surface charge behavior is different to unoxidized AlGaN (with ultrathin native oxide only), which can be validated via surfactant adsorption. Understanding these differences will explain why (oxidized-AlGaN)/GaN-based sensors are better performing than AlGaN ones, which has been previously demonstrated but not understood. EXPERIMENTS The surface of an AlGaN/GaN structure was oxidized with hot piranha solution and oxygen plasma. AFM force measurements and imaging were performed to probe the charge properties of the surface in aqueous solutions of varying pH containing only an acid or base, or with an added ionic surfactant: cationic cetyltrimethylammonium bromide (CTAB) or anionic sodium dodecylsulfate (SDS). FINDINGS The (oxidized-AlGaN)/GaN surface is positively charged at pH 4 and pH 5.5, although pH 5.5 should be close to the isoelectric point of the surface. The surface is negatively charged at pH 10 and pH 12, and sufficiently charged to attract cooperative adsorption of CTAB aggregates at pH 12. At pH 2, the evidence is inconclusive, but the surface is most likely positively charged. Compared to unoxidized AlGaN, the (oxidized-AlGaN)/GaN surface shows a wider range of surface charge magnitude over pH values between 2 and 12. This suggests that the (oxidized-AlGaN)/GaN surface has a higher surface hydroxyl group density than unoxidized AlGaN, which explains the higher sensitivity for pH sensors based on (oxidized-AlGaN)/GaN structures.
Collapse
Affiliation(s)
- Jianan Wang
- School of Engineering, The University of Western Australia, Perth, WA 6009, Australia; School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia.
| | - Hua Li
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia; Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA 6009, Australia.
| | - Haoran Li
- Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA 93106-9560, USA.
| | - Stacia Keller
- Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA 93106-9560, USA.
| | - Umesh K Mishra
- Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA 93106-9560, USA.
| | - Brett D Nener
- School of Engineering, The University of Western Australia, Perth, WA 6009, Australia.
| | - Giacinta Parish
- School of Engineering, The University of Western Australia, Perth, WA 6009, Australia.
| | - Rob Atkin
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia.
| |
Collapse
|