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Khan R, Andreescu D, Hassan MH, Ye J, Andreescu S. Nanoelectrochemistry Reveals Selective Interactions of Perfluoroalkyl Substances (PFASs) with Silver Nanoparticles. Angew Chem Int Ed Engl 2022; 61:e202209164. [DOI: 10.1002/anie.202209164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Reem Khan
- Chemistry and Biomolecular Science Clarkson University 8 Clarkson Ave. Potsdam NY 13699 USA
| | - Daniel Andreescu
- Chemistry and Biomolecular Science Clarkson University 8 Clarkson Ave. Potsdam NY 13699 USA
| | - Mohamed H. Hassan
- Chemistry and Biomolecular Science Clarkson University 8 Clarkson Ave. Potsdam NY 13699 USA
| | - Jingyun Ye
- Chemistry and Biomolecular Science Clarkson University 8 Clarkson Ave. Potsdam NY 13699 USA
| | - Silvana Andreescu
- Chemistry and Biomolecular Science Clarkson University 8 Clarkson Ave. Potsdam NY 13699 USA
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2
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Khan R, Andreescu D, Hassan MH, Ye J, Andreescu S. Nanoelectrochemistry Reveals Selective Interactions of Perfluoroalkyl Substances (PFASs) with Silver Nanoparticles. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Reem Khan
- Clarkson University Chemistry and Biomolecular Science UNITED STATES
| | - Daniel Andreescu
- Clarkson University Chemistry and Biomolecular Science 8 Clarkson Ave 13699 Potsdam UNITED STATES
| | - Mohamed H. Hassan
- Clarkson University Chemistry and Biomolecular Science UNITED STATES
| | - Jingyun Ye
- Clarkson University Chemistry and Biomolecular Science UNITED STATES
| | - Silvana Andreescu
- Clarkson University Chemistry and Biomolecular Science 8 Clarskon Ave 13699 Potsdam UNITED STATES
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Recent progress of phytogenic synthesis of ZnO, SnO 2, and CeO 2 nanomaterials. Bioprocess Biosyst Eng 2022; 45:619-645. [PMID: 35244777 DOI: 10.1007/s00449-022-02713-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 02/14/2022] [Indexed: 01/17/2023]
Abstract
A critical investigation on the fabrication of metal oxide nanoparticles (NPs) such as ZnO, SnO2, and CeO2 NPs synthesized from green and phytogenic method using plants and various plant parts have been compiled. In this review, different plant extraction methods, synthesis methods, characterization techniques, effects of plant extract on the physical, chemical, and optical properties of green synthesized ZnO, SnO2, and CeO2 NPs also have been compiled and discussed. Effect of several parameters on the size, morphology, and optical band gap energy of metal oxide have been explored. Moreover, the role of solvents has been found important and discussed. Extract composition i.e. phytochemicals also found to affect the morphology and size of the synthesized ZnO, SnO2, and CeO2 NPs. It was found that, there is no universal extraction method that is ideal and extraction techniques is unique to the plant type, plant parts, and solvent used.
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4
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Sodium de-insertion processes in single Na TMO2 particles studied by an electrochemical collision method: O3 phases versus P2 phases. Electrochem commun 2021. [DOI: 10.1016/j.elecom.2021.107000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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5
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Rahman A, Harunsani MH, Tan AL, Khan MM. Zinc oxide and zinc oxide-based nanostructures: biogenic and phytogenic synthesis, properties and applications. Bioprocess Biosyst Eng 2021; 44:1333-1372. [PMID: 33661388 DOI: 10.1007/s00449-021-02530-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 02/04/2021] [Indexed: 11/25/2022]
Abstract
Zinc oxide nanoparticles (ZnO NPs) are considered as very significant and essential material due to its multifunctional properties, stability, low cost and wide usage. Many green and biogenic approaches for ZnO NPs synthesis have been reported using various sources such as plants and microorganisms. Plants contain biomolecules that can act as capping, oxidizing and reducing agents that increase the rate of reaction and stabilizes the NPs. This review emphasizes and compiles different types of plants and parts of plant used for the synthesis of ZnO and its potential applications at one place. The influence of biogenic and phytogenic synthesized ZnO on its properties and possible mechanisms for its fabrication has been discussed. This review also highlights the potential applications and future prospects of phytogenic synthesized ZnO in the field of energy production and storage, sun light harvesting, environmental remediation, and biological applications.
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Affiliation(s)
- Ashmalina Rahman
- Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - Mohammad Hilni Harunsani
- Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - Ai Ling Tan
- Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - Mohammad Mansoob Khan
- Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam.
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6
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Little CA, Batchelor-McAuley C, Young NP, Compton RG. Shape and size of non-spherical silver nanoparticles: implications for calculating nanoparticle number concentrations. NANOSCALE 2018; 10:15943-15947. [PMID: 30124715 DOI: 10.1039/c8nr06062b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The international drive to measure accurate number concentrations of nanoparticles is impeded by the typically heterogeneous populations of non-spherical nanoparticles. The irregular shape and size of "50 nm" silver nanoparticles is studied using Electron Tomography. It is evidenced that even for highly symmetrical particles the volume can be over 20% less than that of the circumscribed sphere; more irregularly shaped particles can have volumes of over 45% less. On this basis, criteria are provided to determine the particle sphericity from 2D projections obtained from Electron Microscopy, including an empirical method for particle volume estimation. The results allow the visualisation of irregularly shaped particles, revealing the presence of previously unseen voids in the nanoparticle structure. Comparison of tomographic data with other commonly used particle-sizing methods exposes the limitations of these methods in studying nanoparticle populations that exhibit heterogeneity.
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Affiliation(s)
- Christopher A Little
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
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7
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Little CA, Xie R, Batchelor-McAuley C, Kätelhön E, Li X, Young NP, Compton RG. A quantitative methodology for the study of particle-electrode impacts. Phys Chem Chem Phys 2018; 20:13537-13546. [PMID: 29726865 DOI: 10.1039/c8cp01561a] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Herein we provide a generic framework for use in the acquisition and analysis of the electrochemical responses of individual nanoparticles, summarising aspects that must be considered to avoid mis-interpretation of data. Specifically, we threefold highlight the importance of the nanoparticle shape, the effect of the nanoparticle diffusion coefficient on the probability of it being observed and the influence of the used measurement bandwidth. Using the oxidation of silver nanoparticles as a model system, it is evidenced that when all of the above have been accounted for, the experimental data is consistent with being associated with the complete oxidation of the nanoparticles (50 nm diameter). The duration of many single nanoparticle events are found to be ca. milliseconds in duration over a range of experiments. Consequently, the insight that the use of lower frequency filtered data yields a more accurate description of the charge passed during a nano-event is likely widely applicable to this class of experiment; thus we report a generic methodology. Conversely, information regarding the dynamics of the nano redox event is obscured when using such lower frequency measurements; hence, both data sets are complementary and are required to provide full insight into the behaviour of the reactions at the nanoscale.
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Affiliation(s)
- Christopher A Little
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Ruochen Xie
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Christopher Batchelor-McAuley
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Enno Kätelhön
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Xiuting Li
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Neil P Young
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Richard G Compton
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
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8
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Ngamchuea K, Batchelor-McAuley C, Compton RG. The fate of silver nanoparticles in authentic human saliva. Nanotoxicology 2018; 12:305-311. [PMID: 29451053 DOI: 10.1080/17435390.2018.1438680] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The physicochemical properties of silver nanoparticles (AgNPs) in human whole saliva are investigated herein. In authentic saliva samples, AgNPs exhibit a great stability with over 70% of the nanomaterial remaining intact after a 24-h incubation in the presence of ∼0.3 mM dissolved oxygen. The small loss of AgNPs from the saliva sample has been demonstrated to be a result of two processes: agglomeration/aggregation (not involving oxygen) and oxidative dissolution of AgNPs (assisted by oxygen). In authentic saliva, AgNPs are also shown to be more inert both chemically (silver oxidative dissolution) and electrochemically (electron transfer at an electrode) than in synthetic saliva or aqueous electrolytes. The results thus predict based on the chemical persistence (over a 24-h study) of AgNPs in saliva and hence the minimal release of hazardous Ag+ and reactive oxygen species that the AgNPs are less likely to cause serious harm to the oral cavity but this persistence may enable their transport to other environments.
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Affiliation(s)
- Kamonwad Ngamchuea
- a Department of Chemistry, Physical and Theoretical Chemistry Laboratory , University of Oxford , Oxford , UK
| | | | - Richard G Compton
- a Department of Chemistry, Physical and Theoretical Chemistry Laboratory , University of Oxford , Oxford , UK
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9
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Sokolov SV, Eloul S, Kätelhön E, Batchelor-McAuley C, Compton RG. Electrode-particle impacts: a users guide. Phys Chem Chem Phys 2018; 19:28-43. [PMID: 27918031 DOI: 10.1039/c6cp07788a] [Citation(s) in RCA: 154] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We present a comprehensive guide to nano-impact experiments, in which we introduce newcomers to this rapidly-developing field of research. Central questions are answered regarding required experimental set-ups, categories of materials that can be detected, and the theoretical frameworks enabling the analysis of experimental data. Commonly-encountered issues are considered and presented alongside methods for their solutions.
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Affiliation(s)
- Stanislav V Sokolov
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
| | - Shaltiel Eloul
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
| | - Enno Kätelhön
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
| | - Christopher Batchelor-McAuley
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
| | - Richard G Compton
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
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10
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Wang C, Gao X, Chen Z, Chen Y, Chen H. Preparation, Characterization and Application of Polysaccharide-Based Metallic Nanoparticles: A Review. Polymers (Basel) 2017; 9:E689. [PMID: 30965987 PMCID: PMC6418682 DOI: 10.3390/polym9120689] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 12/03/2017] [Accepted: 12/05/2017] [Indexed: 12/25/2022] Open
Abstract
Polysaccharides are natural biopolymers that have been recognized to be the most promising hosts for the synthesis of metallic nanoparticles (MNPs) because of their outstanding biocompatible and biodegradable properties. Polysaccharides are diverse in size and molecular chains, making them suitable for the reduction and stabilization of MNPs. Considerable research has been directed toward investigating polysaccharide-based metallic nanoparticles (PMNPs) through host⁻guest strategy. In this review, approaches of preparation, including top-down and bottom-up approaches, are presented and compared. Different characterization techniques such as scanning electron microscopy, transmission electron microscopy, dynamic light scattering, UV-visible spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and small-angle X-ray scattering are discussed in detail. Besides, the applications of PMNPs in the field of wound healing, targeted delivery, biosensing, catalysis and agents with antimicrobial, antiviral and anticancer capabilities are specifically highlighted. The controversial toxicological effects of PMNPs are also discussed. This review can provide significant insights into the utilization of polysaccharides as the hosts to synthesize MPNs and facilitate their further development in synthesis approaches, characterization techniques as well as potential applications.
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Affiliation(s)
- Cong Wang
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.
| | - Xudong Gao
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.
| | - Zhongqin Chen
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.
| | - Yue Chen
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.
| | - Haixia Chen
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.
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11
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Ngamchuea K, Clark ROD, Sokolov SV, Young NP, Batchelor-McAuley C, Compton RG. Single Oxidative Collision Events of Silver Nanoparticles: Understanding the Rate-Determining Chemistry. Chemistry 2017; 23:16085-16096. [PMID: 28922508 DOI: 10.1002/chem.201703591] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Indexed: 01/13/2023]
Abstract
The oxidative dissolution of citrate-capped silver nanoparticles (AgNPs, ∼50 nm diameter) is investigated herein by two electrochemical techniques: nano-impacts and anodic stripping voltammetry. Nano-impacts or single nanoparticle-electrode collisions allow the detection of individual nanoparticles. The technique offers an advantage over surface-immobilized methods such as anodic stripping voltammetry as it eliminates the effects of particle agglomeration/aggregation. The electrochemical studies are performed in different electrolytes (KNO3 , KCl, KBr and KI) at varied concentrations (≤20 mm). In nano-impact measurements, the AgNP undergoes complete oxidation upon impact at a suitably potentiostated electrode. The frequency of the nanoparticle-electrode collisions observed as current-transient spikes depends on the electrolyte identity, its concentration and the potential applied at the working electrode. The frequencies of the spikes are significantly higher in the presence of halide ions and increase with increasing potentials. From the frequency, the rate of AgNP oxidation as compared with the timescale the AgNP is in electrical contact with the electrode can be inferred, and hence is indicative of the relative kinetics of the oxidation process. Primarily based on these results, we propose the initial formation of the silver (I) nucleus (Ag+ , AgCl, AgBr or AgI) as the rate-determining process of silver oxidation on the nanoparticle.
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Affiliation(s)
- Kamonwad Ngamchuea
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Richard O D Clark
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Stanislav V Sokolov
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Neil P Young
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Christopher Batchelor-McAuley
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Richard G Compton
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
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12
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Krause KJ, Brings F, Schnitker J, Kätelhön E, Rinklin P, Mayer D, Compton RG, Lemay SG, Offenhäusser A, Wolfrum B. The Influence of Supporting Ions on the Electrochemical Detection of Individual Silver Nanoparticles: Understanding the Shape and Frequency of Current Transients in Nano-impacts. Chemistry 2017; 23:4638-4643. [DOI: 10.1002/chem.201605924] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Indexed: 01/01/2023]
Affiliation(s)
- Kay J. Krause
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Fabian Brings
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Jan Schnitker
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Enno Kätelhön
- Department of Chemistry; Physical and Theoretical Chemistry Laboratory; Oxford University, South Parks Road; Oxford OX1 3QZ UK
| | - Philipp Rinklin
- Neuroelectronics, MSB, Department of Electrical and Computer Engineering; Technical University of Munich (TUM); Boltzmannstr. 11 85748 Garching Germany
- Bernstein Center for Computational Neuroscience Munich; Germany
| | - Dirk Mayer
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Richard G. Compton
- Department of Chemistry; Physical and Theoretical Chemistry Laboratory; Oxford University, South Parks Road; Oxford OX1 3QZ UK
| | - Serge G. Lemay
- MESA+ Institute for Nanotechnology; University of Twente, PO Box 217; 7500 AE Enschede The Netherlands
| | - Andreas Offenhäusser
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Bernhard Wolfrum
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
- Neuroelectronics, MSB, Department of Electrical and Computer Engineering; Technical University of Munich (TUM); Boltzmannstr. 11 85748 Garching Germany
- Bernstein Center for Computational Neuroscience Munich; Germany
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14
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Understanding nano-impacts: Reversible agglomeration and near-wall hindered diffusion. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.01.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Bartlett TR, Sokolov SV, Plowman BJ, Young NP, Compton RG. Tracking of photochemical Ostwald ripening of nanoparticles through voltammetric atom counting. NANOSCALE 2016; 8:16177-16181. [PMID: 27714080 DOI: 10.1039/c6nr05740c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the tracking of atom count in individual nanoparticles during photochemical Ostwald ripening. The nano-impact technique, in conjunction with UV-Vis and TEM analysis, is used to follow the photochemical formation of silver nano-prisms from spherical seed particles. A mechanism of photochemical Ostwald ripening is deduced and key growth stages are identified.
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Affiliation(s)
- Thomas R Bartlett
- Department of Physical and Theoretical Chemistry, Oxford University, South Parks Road, Oxford, OX13QZ, UK.
| | - Stanislav V Sokolov
- Department of Physical and Theoretical Chemistry, Oxford University, South Parks Road, Oxford, OX13QZ, UK.
| | - Blake J Plowman
- Department of Physical and Theoretical Chemistry, Oxford University, South Parks Road, Oxford, OX13QZ, UK.
| | - Neil P Young
- Department of Materials, Oxford University, Parks Road, Oxford, OX13PH, UK
| | - Richard G Compton
- Department of Physical and Theoretical Chemistry, Oxford University, South Parks Road, Oxford, OX13QZ, UK.
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Sokolov SV, Bartlett TR, Fair P, Fletcher S, Compton RG. Femtomolar Detection of Silver Nanoparticles by Flow-Enhanced Direct-Impact Voltammetry at a Microelectrode Array. Anal Chem 2016; 88:8908-12. [PMID: 27494652 PMCID: PMC5015217 DOI: 10.1021/acs.analchem.6b02670] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
![]()
We
report the femtomolar detection of silver (Ag) nanoparticles
by direct-impact voltammetry. This is achieved through the use of
a random array of microelectrodes (RAM) integrated into a purpose-built
flow cell, allowing combined diffusion and convection to the electrode
surface. A coupled RAM-flow cell system is implemented and is shown
to give reproducible wall-jet type flow characteristics, using potassium
ferrocyanide as a molecular redox species. The calibrated flow system
is then used to detect and quantitatively size Ag nanoparticles at
femtomolar concentrations. Under flow conditions, it is found the
nanoparticle impact frequency increases linearly with the volumetric
flow rate. The resulting limit of detection is more than 2 orders
of magnitude smaller than the previous detection limit for direct-impact voltammetry (900 fM) [J. Ellison et al. Sens. Actuators, B2014, 200, 47], and is more than 30 times smaller than the previous detection
limit for mediated-impact voltammetry (83 fM) [T.
M. Alligrant et al. Langmuir2014, 30, 13462].
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Affiliation(s)
- Stanislav V Sokolov
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road Oxford, OX1 3QZ, United Kingdom
| | - Thomas R Bartlett
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road Oxford, OX1 3QZ, United Kingdom
| | - Peter Fair
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road Oxford, OX1 3QZ, United Kingdom
| | - Stephen Fletcher
- Department of Chemistry, Loughborough University Leicestershire, LE11 3TU, United Kingdom
| | - Richard G Compton
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road Oxford, OX1 3QZ, United Kingdom
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Brainina KZ, Stozhko NY, Bukharinova MA, Galperin LG, Vidrevich MB, Murzakaev AM. Mathematical modeling and experimental data of the oxidation of ascorbic acid on electrodes modified by nanoparticles. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3249-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Plowman BJ, Young NP, Batchelor-McAuley C, Compton RG. Nanorod Aspect Ratios Determined by the Nano-Impact Technique. Angew Chem Int Ed Engl 2016; 55:7002-5. [DOI: 10.1002/anie.201602867] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Indexed: 12/26/2022]
Affiliation(s)
- Blake J. Plowman
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
| | - Neil P. Young
- Department of Materials; University of Oxford; Parks Road Oxford OX1 3PH UK
| | | | - Richard G. Compton
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
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Plowman BJ, Young NP, Batchelor-McAuley C, Compton RG. Nanorod Aspect Ratios Determined by the Nano-Impact Technique. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602867] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Blake J. Plowman
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
| | - Neil P. Young
- Department of Materials; University of Oxford; Parks Road Oxford OX1 3PH UK
| | | | - Richard G. Compton
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
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Shimizu K, Tschulik K, Compton RG. Exploring the mineral-water interface: reduction and reaction kinetics of single hematite (α-Fe 2O 3) nanoparticles. Chem Sci 2015; 7:1408-1414. [PMID: 29910899 PMCID: PMC5975920 DOI: 10.1039/c5sc03678j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 11/17/2015] [Indexed: 12/18/2022] Open
Abstract
Here we show that particle impact chronoamperometry allows the quantitative electrochemical characterization of individual mineral nanoparticles with adequate proton concentrations. Through this approach, we extract the kinetics and thermodynamics of the reductive dissolution of single hematite (α-Fe2O3) nanoparticles.
In spite of their natural and technological importance, the intrinsic electrochemical properties of hematite (α-Fe2O3) nanoparticles are not well understood. In particular, particle agglomeration, the presence of surface impurities, and/or inadequate proton concentrations are major obstacles to uncover the fundamental redox activities of minerals in solution. These are particularly problematic when samples are characterized in common electrochemical analyses such as cyclic voltammetry in which nanoparticles are immobilized on a stationary electrode. In this work, the intrinsic reaction kinetics and thermodynamics of individual hematite nanoparticles are investigated by particle impact chronoamperometry. The particle radius derived from the integrated area of spikes recorded in a chronoamperogram is in excellent agreement with electron microscopy results, indicating that the method provides a quantitative analysis of the reduction of the nanoparticles to the ferrous ion. A key finding is that the suspended individual nanoparticles undergo electrochemical reduction at potentials much more positive than those immobilized on a stationary electrode. The critical importance of the solid/water interface on nanoparticle activity is further illustrated by a kinetic model. It is found that the first electron transfer process is the rate determining step of the reductive dissolution of hematite nanoparticles, while the overall process is strongly affected by the interfacial proton concentration. This article highlights the effects of the interfacial proton and ferrous ion concentrations on the reductive dissolution of hematite nanoparticles and provides a highly effective method that can be readily applied to study a wide range of other mineral nanoparticles.
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Affiliation(s)
- K Shimizu
- Department of Chemistry , Physical and Theoretical Chemistry Laboratory , Oxford University , South Parks Road , Oxford , OX1 3QZ , UK . ; ; Tel: +44 (0)1865 275 957
| | - K Tschulik
- Department of Chemistry , Physical and Theoretical Chemistry Laboratory , Oxford University , South Parks Road , Oxford , OX1 3QZ , UK . ; ; Tel: +44 (0)1865 275 957.,Nano-Electrochemistry - Center for Electrochemical Sciences , Faculty of Chemistry and Biochemistry , Ruhr-University Bochum , D-44780 Bochum , Germany
| | - R G Compton
- Department of Chemistry , Physical and Theoretical Chemistry Laboratory , Oxford University , South Parks Road , Oxford , OX1 3QZ , UK . ; ; Tel: +44 (0)1865 275 957
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Zhou XF, Cheng W, Compton RG. Ion insertion into individual 7,7,8,8-tetracyanoquinodimethane nanoparticles. NANOSCALE 2015; 7:15719-15726. [PMID: 26350288 DOI: 10.1039/c5nr04503g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the quantification of partial ion insertion into individual 7,7,8,8-tetracyanoquinodimethane nanoparticles. It is shown that both potassium and sodium ions can be inserted into single TCNQ nanoparticles from aqueous solution. The extent of both potassium and sodium insertion into individual nanoparticles is quantitatively measured and shown to be partial and sodium ion shows a higher extent of insertion. The insertion process is inferred to be limited and controlled by the formation of a thin shell of salt, Na(+)/K(+) TCNQ˙(-) formed at the surface of the nanoparticle.
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Affiliation(s)
- X F Zhou
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
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22
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Sokolov SV, Tschulik K, Batchelor-McAuley C, Jurkschat K, Compton RG. Reversible or not? Distinguishing agglomeration and aggregation at the nanoscale. Anal Chem 2015; 87:10033-9. [PMID: 26352558 DOI: 10.1021/acs.analchem.5b02639] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nanoparticles are prone to clustering either via aggregation (irreversible) or agglomeration (reversible) processes. It is exceedingly difficult to distinguish the two via conventional techniques such as dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), or electron microscopy imaging (scanning electron microscopy (SEM), transmission electron microscopy (TEM)) as such techniques only generally confirm the presence of large particle clusters. Herein we develop a joint approach to tackle the issue of distinguishing between nanoparticle aggregation vs agglomeration by characterizing a colloidal system of Ag NPs using DLS, NTA, SEM imaging and the electrochemical nanoimpacts technique. In contrast to the conventional techniques which all reveal the presence of large clusters of particles, electrochemical nanoimpacts provide information regarding individual nanoparticles in the solution phase and reveal the presence of small nanoparticles (<30 nm) even in high ionic strength (above 0.5 M KCl) and allow a more complete analysis. The detection of small nanoparticles in high ionic strength media evidence the clustering to be a reversible process. As a result it is concluded that agglomeration rather than irreversible aggregation takes place. This observation is of general importance for all colloids as it provides a feasible analysis technique for a wide range of systems with an ability to distinguish subtly different processes.
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Affiliation(s)
- Stanislav V Sokolov
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road, Oxford OX1 3QZ, U.K
| | - Kristina Tschulik
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road, Oxford OX1 3QZ, U.K
| | - Christopher Batchelor-McAuley
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road, Oxford OX1 3QZ, U.K
| | - Kerstin Jurkschat
- Department of Materials, Oxford University , Parks Road, Oxford OX1 3PH, U.K
| | - Richard G Compton
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University , South Parks Road, Oxford OX1 3QZ, U.K
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