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Zhang D, Shao Y, Zhou J, Zhan Q, Wen Z, Mao S, Wei J, Qi L, Shao Y, Wang H. Nanopipette dynamic microscopy unveils nano coffee ring. Proc Natl Acad Sci U S A 2024; 121:e2314320121. [PMID: 38954540 PMCID: PMC11252805 DOI: 10.1073/pnas.2314320121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Accepted: 05/27/2024] [Indexed: 07/04/2024] Open
Abstract
Liquid-phase electron microscopy (LP-EM) imaging has revolutionized our understanding of nanosynthesis and assembly. However, the current closed geometry limits its application for open systems. The ubiquitous physical process of the coffee-ring phenomenon that underpins materials and engineering science remains elusive at the nanoscale due to the lack of experimental tools. We introduce a quartz nanopipette liquid cell with a tunable dimension that requires only standard microscopes. Depending on the imaging condition, the open geometry of the nanopipette allows the imaging of evaporation-induced pattern formation, but it can also function as an ordinary closed-geometry liquid cell where evaporation is negligible despite the nano opening. The nano coffee-ring phenomenon was observed by tracking individual nanoparticles in an evaporating nanodroplet created from a thin liquid film by interfacial instability. Nanoflows drive the assembly and disruption of a ring pattern with the absence of particle-particle correlations. With surface effects, nanoflows override thermal fluctuations at tens of nanometers, in which nanoparticles displayed a "drunken man trajectory" and performed work at a value much smaller than kBT.
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Affiliation(s)
- Deyi Zhang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
| | - Yi Shao
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
| | - Jiayi Zhou
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
| | - Qiangwei Zhan
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
| | - Ziyang Wen
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
| | - Sheng Mao
- College of Engineering, Peking University, Beijing100871, People’s Republic of China
| | - Jingjing Wei
- School of Chemistry and Chemical Engineering, Shandong University, Jinan250100, People’s Republic of China
| | - Limin Qi
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
| | - Yuanhua Shao
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
| | - Huan Wang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Key Laboratory of Polymer Chemistry and Physics, National Biomedical Imaging Center, Peking University, Beijing100871, People’s Republic of China
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2
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Rudnicki K, Sobczak K, Karpiński R, Borgul P, Powałka E, Skrzypek S, Poltorak L. Phenylethylamine sensing at the electrified liquid-liquid interface. Can electrochemistry be used to follow the UHT milk spoilage process? Food Chem 2024; 442:138407. [PMID: 38241999 DOI: 10.1016/j.foodchem.2024.138407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 12/22/2023] [Accepted: 01/07/2024] [Indexed: 01/21/2024]
Abstract
This study involved an investigation into the electrochemical characteristic of a few biogenic amines (BAs) occurring at the polarized interface between two immiscible electrolyte solutions (ITIES) with ion transfer voltammetry (ITV). The main focus of this research was the comprehensive electroanalytical and physicochemical analysis of phenylethylamine (PEA), allowing the determined of the formal Galvani potential of the ion transfer reaction (ΔorgaqΦ'), diffusion coefficients (D), formal free Gibbs energy of the ion transfer reaction (ΔG'aq→org) and water-1,2-dichloroethane partition coefficient (logPwater/DCEPEA). Furthermore, the collected data were employed to calculate analytical parameters, including voltametric detection sensitivity, limits of detection and the target analyte quantification. Moreover, the influence of the presence of 7 other BAs (histamine, spermine, spermidine, putrescine, cadaverine, tyramine and tryptamine) on the recorded signals originating from the PEA ion transfer was checked. The feasibility of the developed method was corroborated through experimentation with milk samples. Additionally, utilizing the devised methodology, an electrochemical assessment of the spoilage progression in milk samples was undertaken.
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Affiliation(s)
- Konrad Rudnicki
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403 Lodz, Poland.
| | - Karolina Sobczak
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403 Lodz, Poland
| | - Robert Karpiński
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403 Lodz, Poland
| | - Paulina Borgul
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403 Lodz, Poland
| | - Emilia Powałka
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403 Lodz, Poland
| | - Sławomira Skrzypek
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403 Lodz, Poland
| | - Lukasz Poltorak
- Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403 Lodz, Poland.
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Li P, Liu J, Yuan JH, Guo Y, Wang S, Zhang P, Wang W. Artificial Funnel Nanochannel Device Emulates Synaptic Behavior. NANO LETTERS 2024; 24:6192-6200. [PMID: 38666542 DOI: 10.1021/acs.nanolett.3c05079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
Creating artificial synapses that can interact with biological neural systems is critical for developing advanced intelligent systems. However, there are still many difficulties, including device morphology and fluid selection. Based on Micro-Electro-Mechanical System technologies, we utilized two immiscible electrolytes to form a liquid/liquid interface at the tip of a funnel nanochannel, effectively enabling a wafer-level fabrication, interactions between multiple information carriers, and electron-to-chemical signal transitions. The distinctive ionic transport properties successfully achieved a hysteresis in ionic transport, resulting in adjustable multistage conductance gradient and synaptic functions. Notably, the device is similar to biological systems in terms of structure and signal carriers, especially for the low operating voltage (200 mV), which matches the biological neural potential (∼110 mV). This work lays the foundation for realizing the function of iontronics neuromorphic computing at ultralow operating voltages and in-memory computing, which can break the limits of information barriers for brain-machine interfaces.
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Affiliation(s)
- Peiyue Li
- School of Integrated Circuits, Peking University, Beijing 100871, People's Republic of China
| | - Junjie Liu
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Jun-Hui Yuan
- School of Science, Wuhan University of Technology, Wuhan 430070, People's Republic of China
| | - Yechang Guo
- School of Integrated Circuits, Peking University, Beijing 100871, People's Republic of China
| | - Shaofeng Wang
- School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China
| | - Pan Zhang
- School of Integrated Circuits, Peking University, Beijing 100871, People's Republic of China
- National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Beijing 100871, People's Republic of China
| | - Wei Wang
- School of Integrated Circuits, Peking University, Beijing 100871, People's Republic of China
- National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Beijing 100871, People's Republic of China
- Beijing Advanced Innovation Center for Integrated Circuits, Beijing 100871, People's Republic of China
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4
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Lamichhane HB, Arrigan DWM. Modulating the ion-transfer electrochemistry of perfluorooctanoate with serum albumin and β-cyclodextrin. Analyst 2024; 149:2647-2654. [PMID: 38546701 DOI: 10.1039/d3an02164e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2024]
Abstract
Per- and polyfluoroalkyl substances (PFAS) are durable synthetic pollutants that persist in the environment and resist biodegradation. Ion-transfer electrochemistry at aqueous-organic interfaces is a simple strategy for the detection of ionised PFAS. Herein, we investigate the modulation of the ion transfer voltammetry of perfluorooctanoate (PFOA) at liquid-liquid micro-interface arrays by aqueous phase bovine serum albumin (BSA) or β-cyclodextrin (β-CD) and examine the determination of association constants for these binding interactions. By tracking the ion transfer current due to ionised, uncomplexed PFOA as a function of BSA or β-CD concentration, titration curves are produced. Fitting of a binding isotherm to these data provides the association constants. The association constant of PFOA with the BSA determined in this way was ca. 105 M-1 assuming a 1 : 1 binding. Likewise, the association constant for PFOA with β-CD was ca. 104 M-1 for a 1 : 1 β-CD-PFOA complex. Finally, the simultaneous effect of both BSA and β-CD on the ion transfer voltammetry of PFOA was studied, showing clearly that PFOA bound to BSA is released (de-complexed) upon addition of β-CD. The results presented here show ion transfer voltammetry as a simple strategy for the study of molecular and biomolecular binding of ionised PFAS and is potentially useful in understanding the affinity of different PFAS with aqueous phase binding agents such as proteins and carbohydrates.
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Affiliation(s)
- Hum Bahadur Lamichhane
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
| | - Damien W M Arrigan
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
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Huang SH, Parandhaman M, Farnia S, Kim J, Amemiya S. Nanoelectrochemistry at liquid/liquid interfaces for analytical, biological, and material applications. Chem Commun (Camb) 2023; 59:9575-9590. [PMID: 37458703 PMCID: PMC10416082 DOI: 10.1039/d3cc01982a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
Herein, we feature our recent efforts toward the development and application of nanoelectrochemistry at liquid/liquid interfaces, which are also known as interfaces between two immiscible electrolyte solutions (ITIES). Nanopipets, nanopores, and nanoemulsions are developed to create the nanoscale ITIES for the quantitative electrochemical measurement of ion transfer, electron transfer, and molecular transport across the interface. The nanoscale ITIES serves as an electrochemical nanosensor to enable the selective detection of various ions and molecules as well as high-resolution chemical imaging based on scanning electrochemical microscopy. The powerful nanoelectroanalytical methods will be useful for biological and material applications as illustrated by in situ studies of solid-state nanopores, nuclear pore complexes, living bacteria, and advanced nanoemulsions. These studies provide unprecedented insights into the chemical reactivity of important biological and material systems even at the single nanostructure level.
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Affiliation(s)
- Siao-Han Huang
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
| | | | - Solaleh Farnia
- Department of Chemistry, University of Rhode Island, Kingston, RI, 02881, USA.
| | - Jiyeon Kim
- Department of Chemistry, University of Rhode Island, Kingston, RI, 02881, USA.
| | - Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
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Wang X, Yang H, Yu Z, Zhang Z, Chen Y. Two-Dimensional Graphene-Based Potassium Channels Built at an Oil/Water Interface. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5393. [PMID: 37570097 PMCID: PMC10419551 DOI: 10.3390/ma16155393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 07/27/2023] [Accepted: 07/29/2023] [Indexed: 08/13/2023]
Abstract
Graphene-based laminar membranes exhibit remarkable ion sieving properties, but their monovalent ion selectivity is still low and much less than the natural ion channels. Inspired by the elementary structure/function relationships of biological ion channels embedded in biomembranes, a new strategy is proposed herein to mimic biological K+ channels by using the graphene laminar membrane (GLM) composed of two-dimensional (2D) angstrom(Å)-scale channels to support a simple model of semi-biomembrane, namely oil/water (O/W) interface. It is found that K+ is strongly preferred over Na+ and Li+ for transferring across the GLM-supported water/1,2-dichloroethane (W/DCE) interface within the same potential window (-0.1-0.6 V), although the monovalent ion selectivity of GLM under the aqueous solution is still low (K+/Na+~1.11 and K+/Li+~1.35). Moreover, the voltammetric responses corresponding to the ion transfer of NH4+ observed at the GLM-supported W/DCE interface also show that NH4+ can often pass through the biological K+ channels due to their comparable hydration-free energies and cation-π interactions. The underlying mechanism of as-observed K+ selective voltammetric responses is discussed and found to be consistent with the energy balance of cationic partial-dehydration (energetic costs) and cation-π interaction (energetic gains) as involved in biological K+ channels.
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Affiliation(s)
- Xiaoyuan Wang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
| | | | | | | | - Yong Chen
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
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7
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Premadasa UI, Bocharova V, Lin L, Genix AC, Heller WT, Sacci RL, Ma YZ, Thiele NA, Doughty B. Tracking Molecular Transport Across Oil/Aqueous Interfaces: Insight into "Antagonistic" Binding in Solvent Extraction. J Phys Chem B 2023. [PMID: 37216432 DOI: 10.1021/acs.jpcb.3c00386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Liquid/liquid (L/L) interfaces play a key, yet poorly understood, role in a range of complex chemical phenomena where time-evolving interfacial structures and transient supramolecular assemblies act as gatekeepers to function. Here, we employ surface-specific vibrational sum frequency generation combined with neutron and X-ray scattering methods to track the transport of dioctyl phosphoric acid (DOP) and di-(2-ethylhexyl) phosphoric acid (DEHPA) ligands used in solvent extraction at buried oil/aqueous interfaces away from equilibrium. Our results show evidence for a dynamic interfacial restructuring at low ligand concentrations in contrast to expectation. These time-varying interfaces arise from the transport of sparingly soluble interfacial ligands into the neighboring aqueous phase. These results support a proposed "antagonistic" role of ligand complexation in the aqueous phase that could serve as a holdback mechanism in kinetic liquid extractions. These findings provide new insights into interfacially controlled chemical transport at L/L interfaces and how these interfaces vary chemically, structurally, and temporally in a concentration-dependent manner and present potential avenues to design selective kinetic separations.
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Affiliation(s)
- Uvinduni I Premadasa
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Vera Bocharova
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Lu Lin
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Anne-Caroline Genix
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, F-34095 Montpellier, France
| | - William T Heller
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Robert L Sacci
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Ying-Zhong Ma
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Nikki A Thiele
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Benjamin Doughty
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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Stelmaszczyk P, Kwaczyński K, Rudnicki K, Skrzypek S, Wietecha-Posłuszny R, Poltorak L. Nitrazepam and 7-aminonitrazepam studied at the macroscopic and microscopic electrified liquid-liquid interface. Mikrochim Acta 2023; 190:182. [PMID: 37052720 PMCID: PMC10101902 DOI: 10.1007/s00604-023-05739-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 03/09/2023] [Indexed: 04/14/2023]
Abstract
Two benzodiazepine type drugs, that is, nitrazepam and 7-aminonitrazepam, were studied at the electrified liquid-liquid interface (eLLI). Both drugs are illicit and act sedative in the human body and moreover are used as date rape drugs. Existence of the diazepine ring in the concerned chemicals structure and one additional amine group (for 7-aminonitrazepam) allows for the molecular charging below their pKa values, and hence, both drugs can cross the eLLI interface upon application of the appropriate value of the Galvani potential difference. Chosen molecules were studied at the macroscopic eLLI formed in the four electrode cell and microscopic eLLI formed within a microtip defined as the single pore having 25 μm in diameter. Microscopic eLLI was formed using only a few μL of the organic and the aqueous phase with the help of a 3D printed cell. Parameters such as limit of detection and voltammetric detection sensitivity are derived from the experimental data. Developed methodology was used to detect nitrazepam in pharmaceutical formulation and both drugs (nitrazepam and 7-aminonitrazepam) in spiked biological fluids (urine and blood).
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Affiliation(s)
- Paweł Stelmaszczyk
- Laboratory for Forensic Chemistry, Department of Analytical Chemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Krakow, Poland
| | - Karolina Kwaczyński
- Electrochemistry@Soft Interfaces Team, Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland
| | - Konrad Rudnicki
- Electrochemistry@Soft Interfaces Team, Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland
| | - Sławomira Skrzypek
- Electrochemistry@Soft Interfaces Team, Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland
| | - Renata Wietecha-Posłuszny
- Laboratory for Forensic Chemistry, Department of Analytical Chemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Krakow, Poland.
| | - Lukasz Poltorak
- Electrochemistry@Soft Interfaces Team, Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, Tamka 12, 91-403, Lodz, Poland.
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9
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Ma Y, Zhao X, Wang Q, Wang L. Fourier transform voltammetric studies of single nanoparticles transition impacts at the micro-liquid/liquid interface. J Electroanal Chem (Lausanne) 2023. [DOI: 10.1016/j.jelechem.2023.117412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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10
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Moshrefi R, Ryan K, Connors EP, Walsh JC, Merschrod E, Bodwell GJ, Stockmann TJ. Electrosynthesis of Au nanocluster embedded conductive polymer films at soft interfaces using dithiafulvenyl-functionalized pyrene. NANOSCALE 2023; 15:5834-5842. [PMID: 36861258 DOI: 10.1039/d2nr06519c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Nanoparticle (NP) embedded conductive polymer films are desirable platforms for electrocatalysis as well as biomedical and analytical applications. Increased catalytic and analytical performance is accompanied by concomitant decreases in NP size. Herein, highly reproducible electrogeneration of low dispersity Au nanocluster embedded ultra-thin (∼2 nm) conductive polymer films at a micro liquid|liquid interface is demonstrated. Confinement at a micropipette tip facilitates a heterogeneous electron transfer process across the interface between two immiscible electrolyte solutions (ITIES), between KAuCl4(aq) and a dithiafulvenyl-substituted pyrene monomer, 4,5-didecoxy-1,8-bis(dithiafulven-6-yl)pyrene (bis(DTF)pyrene), in oil, i.e., a w|o interface. At a large ITIES the reaction is spontaneous, rapid, and proceeds via transfer of AuCl4- to the oil phase, followed by homogeneous electron transfer generating uncontrolled polymer growth with larger (∼50 nm) Au nanoparticles (NPs). Thus, miniaturization facilitates external, potential control and limits the reaction pathway. Atomic (AFM) and Kelvin probe force microscopies (KPFM) imaged the topography and work function distribution of the as-prepared films. The latter was linked to nanocluster distribution.
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Affiliation(s)
- Reza Moshrefi
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Katelyn Ryan
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Evan P Connors
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Joshua C Walsh
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Erika Merschrod
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Graham J Bodwell
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Talia Jane Stockmann
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
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Sudalaimani S, Arun S, Esokkiya A, Sanjeev Kumar K, Sivakumar C, Giribabu K. Disposable-micropipette tip supported electrified liquid-organogel interface as a platform for sensing acetylcholine. Analyst 2023; 148:1451-1459. [PMID: 36804568 DOI: 10.1039/d2an01663j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Sensing acetylcholine has been predominantly based on enzymatic strategies using acetylcholine esterase and choline oxidase because of its electrochemical inertness. Electrified liquid-liquid interfaces are not limited to oxidation/reduction processes, and can be utilized to detect non-redox molecules which cannot be detected using conventional solid electrodes. In this study, a disposable micropipette tip based liquid-organogel interface, in the presence/absence of calixarene has been developed as a platform for sensing acetylcholine. We also explored a liquid-liquid interface approach for sensing acetylcholine using a pre-pulled glass micropipette. In both approaches, the configuration, i.e., liquid-organogel and liquid-liquid interface-current linearly increases during the backward transfer of acetylcholine. The simple and facilitated ion transfer of acetylcholine across the liquid-organogel exhibited a linear range of 10-50 μM and 1-30 μM with a detection limit of 0.18 μM and 0.23 μM and a sensitivity of 9.52 nA μM-1 and 9.20 nA μM-1, respectively. Whereas, the detection limit of simple and facilitated ion transfer of liquid-liquid interface using pre-pulled glass micropipette was found to be 0.42 μM and 0.13 μM with a sensitivity of 5 × 10-3 nA μM-1 and 3.39 × 10-2 nA μM-1. The results indicate that the liquid-organogel configuration supported on a disposable micropipette tip without any pre-fabrication is highly suitable for electrified soft interface sensing applications.
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Affiliation(s)
- S Sudalaimani
- Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi-630 003, Tamil Nadu, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - S Arun
- Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi-630 003, Tamil Nadu, India.
| | - A Esokkiya
- Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi-630 003, Tamil Nadu, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - K Sanjeev Kumar
- Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi-630 003, Tamil Nadu, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - C Sivakumar
- Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi-630 003, Tamil Nadu, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - K Giribabu
- Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi-630 003, Tamil Nadu, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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12
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Simultaneous electro-generation/polymerization of Cu nanocluster embedded conductive poly(2,2':5',2''-terthiophene) films at micro and macro liquid/liquid interfaces. Sci Rep 2023; 13:1201. [PMID: 36681717 PMCID: PMC9867727 DOI: 10.1038/s41598-023-28391-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 01/18/2023] [Indexed: 01/22/2023] Open
Abstract
Cu nanoparticles (NPs) have been shown to be excellent electrocatalysts, particularly for CO2 reduction - a critical reaction for sequestering anthropogenic, atmospheric carbon. Herein, the micro interface between two immiscible electrolyte solutions (ITIES) is exploited for the simultaneous electropolymerization of 2,2':5',2''-terthiophene (TT) and reduction of Cu2+ to Cu nanoparticles (NPs) generating a flexible electrocatalytic composite electrode material. TT acts as an electron donor in 1,2-dichloroethane (DCE) through heterogeneous electron transfer across the water|DCE (w|DCE) interface to CuSO4 dissolved in water. The nanocomposite formation process was probed using cyclic voltammetry as well as electrochemical impedance spectroscopy (EIS). CV and EIS data show that the film forms quickly; however, the interfacial reaction is not spontaneous and does not proceed without an applied potential. At high [TT] the heterogeneous electron transfer wave was recorded voltammetrically but not at low [TT]. However, probing the edge of the polarizable potential window was found to be sufficient to initiate electrogeneration/electropolymerization. SEM and TEM were used to image and analyze the final Cu NP/poly-TT composites and it was discovered that there is a concomitant decrease in NP size with increasing [TT]. Preliminary electrocatalysis results at a nanocomposite modified large glassy carbon electrode saw a > 2 × increase in CO2 reduction currents versus an unmodified electrode. These data suggest that this strategy is a promising means of generating electrocatalytic materials for carbon capture. However, films electrosynthesized at a micro and ~ 1 mm ITIES demonstrated poor reusability.
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13
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Da Y, Luo S, Tian Y. Real-Time Monitoring of Neurotransmitters in the Brain of Living Animals. ACS APPLIED MATERIALS & INTERFACES 2023; 15:138-157. [PMID: 35394736 DOI: 10.1021/acsami.2c02740] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Neurotransmitters, as important chemical small molecules, perform the function of neural signal transmission from cell to cell. Excess concentrations of neurotransmitters are often closely associated with brain diseases, such as Alzheimer's disease, depression, schizophrenia, and Parkinson's disease. On the other hand, the release of neurotransmitters under the induced stimulation indicates the occurrence of reward-related behaviors, including food and drug addiction. Therefore, to understand the physiological and pathological functions of neurotransmitters, especially in complex environments of the living brain, it is urgent to develop effective tools to monitor their dynamics with high sensitivity and specificity. Over the past 30 years, significant advances in electrochemical sensors and optical probes have brought new possibilities for studying neurons and neural circuits by monitoring the changes in neurotransmitters. This Review focuses on the progress in the construction of sensors for in vivo analysis of neurotransmitters in the brain and summarizes current attempts to address key issues in the development of sensors with high selectivity, sensitivity, and stability. Combined with the latest advances in technologies and methods, several strategies for sensor construction are provided for recording chemical signal changes in the complex environment of the brain.
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Affiliation(s)
- Yifan Da
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, Dongchuan Road 500, Shanghai 200241, China
| | - Shihua Luo
- Department of Traumatology, Rui Jin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Yang Tian
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, Dongchuan Road 500, Shanghai 200241, China
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Heroin detection in a droplet hosted in a 3D printed support at the miniaturized electrified liquid-liquid interface. Sci Rep 2022; 12:18615. [PMID: 36329050 PMCID: PMC9633610 DOI: 10.1038/s41598-022-21689-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 09/30/2022] [Indexed: 11/06/2022] Open
Abstract
Simple sensing protocols for the detection of illicit drugs are needed. Electrochemical sensing is especially attractive in this respect, as its cost together with the analytical accuracy aspires to replace still frequently used colorimetric tests. In this work, we have shown that the interfacial transfer of protonated heroin can be followed at the electrified water-1,2-dichloroethane interface. We have comprehensively studied the interfacial behavior of heroin alone and in the presence of its major and abundant cutting agents, caffeine and paracetamol. To maximally increase developed sensing protocol applicability we have designed and 3D printed a platform requiring only a few microliters of the aqueous and the organic phase. The proposed sensing platform was equipped with a cavity hosting a short section of Ag/AgCl electrode, up to 20 µL of the aqueous phase and the end of the micropipette tip being used as a casing of a fused silica capillary having 25 µm as the internal pore diameter. The volume of the organic phase was equal to around 5 µL and was present inside the micropipette tip. We have shown that under optimized conditions heroin can be detected in the presence of caffeine and paracetamol existing in a sample with 10,000 times excess over the analyte of interest. The calculated limit of detection equal to 1.3 µM, linear dynamic range spanning to at least 50 µM, good reproducibility, and very low volume of needed sample is fully in line with forensic demands.
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15
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Oleic and nitro-oleic acid behavior at an electrified water-1,2-dichloroethane interface. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Moshrefi R, Stockmann TJ. Electrodeless Synthesis of Low Dispersity Au Nanoparticles and Nanoclusters at an Immiscible Micro Water/Ionic Liquid Interface. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2748. [PMID: 36014613 PMCID: PMC9416156 DOI: 10.3390/nano12162748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/08/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Owing to their biocompatibility, optical, and catalytic properties, Au nanoparticles (NPs) have been the subject of much research. Since smaller NPs have enhanced catalytic properties and NP morphology greatly impacts their effectiveness, controlled and reproducible methods of generating Au NPs are still being sought. Herein, Au NPs were electrochemically generated at a water|ionic liquid (w|IL) immiscible micro-interface, 25 µm in diameter, using a redox active IL and compared to results at a water|oil (w|o) one. The liquid|liquid interface is advantageous as it is pristine and highly reproducible, as well as an excellent means of species and charge separation. In this system, KAuCl4 dissolved in the aqueous phase reacts under external potential control at the water|P8888TB (tetraoctylphosphonium tetrakis(pentafluorophenyl)borate) with trioctyl(ferrocenylhexanoyl)phosphonium tetrakis(pentafluorophenyl)borate (FcIL), an electron donor and redox active IL. FcIL was prepared with a common anion to P8888TB, which greatly enhances its solubility in the bulk IL. Simple ion transfer of AuCl4− and AuCl(4−γ)(OH)γ− at the w|P8888TB micro-interface were characterized voltammetrically as well as their heterogeneous electron transfer reaction with FcIL. This interfacial reaction generates Au NPs whose size can be thermodynamically controlled by modifying the pH of the aqueous phase. Critically, at low pH, nanoclusters, <1.7 nm in diameter, were generated owing to inhibited thermodynamics in combination with the supramolecular fluidic nature of the IL microenvironment that was observed surrounding the as-prepared NPs.
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Cao J, Zhou J, Li M, Chen J, Zhang Y, Liu X. Insightful understanding of three-phase interface behaviors in 1T-2H MoS2/CFP electrode for hydrogen evolution improvement. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.11.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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18
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You Y, Bai S, Ma Y, Liu C, Wang L. A Nanopipette Supported Oil/Water Interface Sensor for the Kinetics Analysis and Determination of Phenothiazine Derivatives. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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19
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Kowalewska K, Sipa K, Kaczmarek K, Skrzypek S, Poltorak L. Interfacial Synthesis of Nylon‐6.6 and Its Modification with Silver‐Based Nanoparticles at the Electrified Liquid‐Liquid Interface. ChemElectroChem 2022. [DOI: 10.1002/celc.202200435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Karolina Sipa
- University of Lodz: Uniwersytet Lodzki Faculty of Chemistry POLAND
| | | | | | - Lukasz Poltorak
- Uniwersytet Lodzki Faculty of Chemistry Tamka 12 90-403 Lodz POLAND
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He P, Shao Y, Yu Z, Liang X, Liu J, Bian Y, Zhu Z, Li M, Pereira CM, Shao Y. Electrostatic-Gated Kinetics of Rapid Ion Transfers at a Nano-liquid/Liquid Interface. Anal Chem 2022; 94:9801-9810. [PMID: 35766488 DOI: 10.1021/acs.analchem.2c01574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Charge (ion and electron)-transfer reactions at a liquid/liquid interface are critical processes in many important biological and chemical systems. An ion-transfer (IT) process is usually very fast, making it difficult to accurately measure its kinetic parameters. Nano-liquid/liquid interfaces supported at nanopipettes are advantageous approaches to study the kinetics of such ultrafast IT processes due to their high mass transport rate. However, correct measurements of IT kinetic parameters at nanointerfaces supported at nanopipettes are inhibited by a lack of knowledge of the nanometer-sized interface geometry, influence of the electric double layer, wall charge polarity, etc. Herein, we propose a new electrochemical characterization equation for nanopipettes and make a suggestion on the shape of a nano-water/1,2-dichloroethane (nano-W/DCE) interface based on the characterization and calculation results. A theoretical model based on the Poisson-Nernst-Planck equation was applied to systematically study how the electric double layer influences the IT process of cations (TMA+, TEA+, TPrA+, ACh+) and anions (ClO4-, SCN-, PF6-, BF4-) at the nano-W/DCE interface. The relationships between the wall charge conditions and distribution of concentration and potential inside the nanopipette revealed that the measured standard rate constant (k0) was enhanced when the polarity of the ionic species was opposite to the pipette wall charge and reduced when the same. This work lays the right foundation to obtain the kinetics at the nano-liquid/liquid interfaces.
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Affiliation(s)
- Peng He
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yi Shao
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zhengyou Yu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xu Liang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Junjie Liu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yixuan Bian
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zhiwei Zhu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Meixian Li
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Carlos M Pereira
- Centro de Investigação em Química da Universidade do Porto, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Porto 4099-002, Portugal
| | - Yuanhua Shao
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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21
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Sissaoui J, Efimov A, Kumpulainen T, Vauthey E. Photoinduced Electron Transfer in a Porphyrin-Fullerene Dyad at a Liquid Interface. J Phys Chem B 2022; 126:4723-4730. [PMID: 35727678 DOI: 10.1021/acs.jpcb.2c02405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The excited-state properties of an amphiphilic porphyrin-fullerene dyad and of its porphyrin analogue adsorbed at the dodecane/water interface are investigated by using surface second-harmonic generation. Although the porphyrin is formally centrosymmetric, the second-harmonic spectra of both compounds are dominated by the intense Soret band of the porphyrin. Polarization-selective measurements and molecular dynamics simulations suggest an angle of about 45° between the donor-acceptor axis and the interfacial plane, with the porphyrin interacting mostly with the nonpolar phase. Time-resolved measurements reveal a marked concentration dependence of the dynamics of both compounds upon Q-band excitation, indicating the occurrence of intermolecular quenching processes. The significant differences in dynamics and spectra between the dyad and the porphyrin analogue are explained by a self-quenching of the excited dyad via an intermolecular electron transfer.
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Affiliation(s)
- Jihad Sissaoui
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
| | - Alexander Efimov
- Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 8, 33100 Tampere, Finland
| | - Tatu Kumpulainen
- Department of Chemistry/Nanoscience Center, University of Jyväskylä, Survontie 9 C, 40014 Jyväskylä, Finland
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland
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22
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Itagaki R, Takizawa SY, Chang HC, Nakada A. Light-induced electron transfer/phase migration of a redox mediator for photocatalytic C-C coupling in a biphasic solution. Dalton Trans 2022; 51:9467-9476. [PMID: 35678270 DOI: 10.1039/d2dt01334g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photocatalytic molecular conversions that lead to value-added chemicals are of considerable interest. To achieve highly efficient photocatalytic reactions, it is equally important as it is challenging to construct systems that enable effective charge separation. Here, we demonstrate that the rational construction of a biphasic solution system with a ferrocenium/ferrocene (Fc+/Fc) redox couple enables efficient photocatalysis by spatial charge separation using the liquid-liquid interface. In a single-phase system, exposure of a 1,2-dichloroethane (DCE) solution containing a Ru(II)- or Ir(III)-based photosensitizer, Fc, and benzyl bromide (Bn-Br) to visible-light irradiation failed to generate any product. However, the photolysis in a H2O/DCE biphasic solution, where the compounds are initially distributed in the DCE phase, facilitated the reductive coupling of Bn-Br to dibenzyl (Bn2) using Fc as an electron donor. The key result of this study is that Fc+, generated by photooxidation of Fc in the DCE phase, migrates to the aqueous phase due to the drastic change in its partition coefficient compared to that of Fc. This liquid-liquid phase migration of the mediator is essential for facilitating the reduction of Bn-Br in the DCE phase as it suppresses backward charge recombination. The co-existence of anions can further modify the driving force of phase migration of Fc+ depending on their hydrophilicity; the best photocatalytic activity was obtained with a turnover frequency of 79.5 h-1 and a quantum efficiency of 0.2% for the formation of Bn2 by adding NBu4+Br- to the biphasic solution. This study showcases a potential approach for rectifying electron transfer with suppressed charge recombination to achieve efficient photocatalysis.
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Affiliation(s)
- Ren Itagaki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
| | - Shin-Ya Takizawa
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Ho-Chol Chang
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
| | - Akinobu Nakada
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan. .,Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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23
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Moshrefi R, Connors E, Merschrod E, Stockmann TJ. Simultaneous electropolymerization/Au nanoparticle generation at an electrified liquid/liquid micro-interface. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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24
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Liu J, Zheng X, Hua Y, Deng J, He P, Yu Z, Zhang X, Shi X, Shao Y. Electrochemical Study of Ion Transfers Processes at the Interfaces between Water and Trifluorotoluene and Its Derivatives. ChemElectroChem 2022. [DOI: 10.1002/celc.202200389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Junjie Liu
- Peking University College of Chemistry and Molecular Engineering CHINA
| | - Xinhe Zheng
- Peking University College of Chemistry and Molecular Engineering CHINA
| | - Yutong Hua
- Peking University College of Chemistry and Molecular Engineering CHINA
| | - Jintao Deng
- Peking University College of Chemistry and Molecular Engineering CHINA
| | - Peng He
- Peking University College of Chemistry and Molecular Engineering CHINA
| | - Zhengyou Yu
- Peking University College of Chemistry and Molecular Engineering CHINA
| | - Xianhao Zhang
- Peking University College of Chemistry and Molecular Engineering CHINA
| | - Xiaohong Shi
- Taiyuan Normal University Department of Chemistry CHINA
| | - Yuanhua Shao
- Peking University College of Chemistry and Molecular Engineering 202 Chengfu Road 100871 Beijing CHINA
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25
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26
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Voltammetric study of cefotaxime at the macroscopic and miniaturized interface between two immiscible electrolyte solutions. Mikrochim Acta 2021; 188:413. [PMID: 34751834 PMCID: PMC8578136 DOI: 10.1007/s00604-021-05072-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 10/17/2021] [Indexed: 12/12/2022]
Abstract
The electrochemical behavior of cefotaxime (CTX+) was investigated at the polarized macro- and micro-interface between two immiscible electrolyte solutions (ITIES) by cyclic voltammetry and alternating current voltammetry. Miniaturization was achieved with fused silica microcapillary tubing entrapped in a polymeric casing. Scanning electron microscopy (SEM) was employed for the fabricated LLI support characterization. Voltammetric investigation of CTX+ at macro- and μ-ITIES allowed the determination of many physicochemical parameters, such as formal Galvani potential of the ion transfer reaction (\documentclass[12pt]{minimal}
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\begin{document}$${\Delta }_{org}^{aq}{\varPhi}^{\prime }$$\end{document}ΔorgaqΦ′), diffusion coefficients (D), formal free Gibbs energy of the ion transfer reaction (∆G′aq → org), and water-1,2-dichloroethane partition coefficient (\documentclass[12pt]{minimal}
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\begin{document}$${\log}{P}_{water/ DCE}^{CTX+}$$\end{document}logPwater/DCECTX+). Additionally, based on the results obtained the analytical parameters including voltammetric sensitivity, limits of detection and the limits of quantification (in micromolar range) were calculated. The applicability of the developed procedures was verified in spiked still mineral and tap water samples.
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Nieminen E, Murtomäki L. Kinetics of Cu
2+
Reduction and Nanoparticle Nucleation at Micro‐scale 1,2‐Dichlorobenzene‐water Interface Studied by Cyclic Voltammetry and Square‐wave Voltammetry. ELECTROANAL 2021. [DOI: 10.1002/elan.202100172] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eemi Nieminen
- Department of Chemistry Aalto University P.O. Box 16100 FI-00076 Aalto Finland
| | - Lasse Murtomäki
- Department of Chemistry Aalto University P.O. Box 16100 FI-00076 Aalto Finland
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28
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Sudalaimani S, Sanjeev Kumar K, Esokkiya A, Suresh C, Giribabu K. Electrified liquid-liquid interface as an electrochemical tool for the sensing of putrescine and cadaverine. Analyst 2021; 146:3208-3215. [PMID: 33999050 DOI: 10.1039/d1an00019e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Putrescine and cadaverine are biogenic amines that serve as potential biomarkers for several types of cancers and monitoring food quality. Electrochemical sensing of putrescine and cadaverine by non-enzymatic routes remains a challenge because of their inertness at unmodified electrode surfaces and hence a liquid-liquid interface strategy has been employed for their detection. In the present study, electrochemical sensing of cadaverine and putrescine has been demonstrated by simple and facilitated ion-transfer processes using a liquid-liquid microinterface supported by a microcapillary. A microinterface was constructed in different configurations by varying the aqueous phase composition in the absence and presence of dibenzo-18-crown-6, and the ion-transfer ability of putrescine and cadaverine was studied in these configurations. A peak shaped voltammogram was observed in the backward scan, due to the linear diffusion of putrescine and cadaverine from the organic to the aqueous phase. The detection ability in the presence of dibenzo-18-crown-6 was observed in the concentration ranges of 0.25-25 μM and 0.25-40 μM for putrescine and cadaverine with detection limits of 0.11 and 0.17 μM respectively. In the presence of dibenzo-18-crown-6, the electrochemical sensing of putrescine and cadaverine was more pronounced compared to the simple ion-transfer process.
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Affiliation(s)
- S Sudalaimani
- Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi-630 003, Tamil Nadu, India.
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29
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Burgoyne ED, Molina-Osorio AF, Moshrefi R, Shanahan R, McGlacken GP, Stockmann TJ, Scanlon MD. Detection of Pseudomonas aeruginosa quorum sensing molecules at an electrified liquid|liquid micro-interface through facilitated proton transfer. Analyst 2021; 145:7000-7008. [PMID: 32869782 DOI: 10.1039/d0an01245a] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Miniaturization of electrochemical detection methods for point-of-care-devices is ideal for their integration and use within healthcare environments. Simultaneously, the prolific pathogenic bacteria Pseudomonas aeruginosa poses a serious health risk to patients with compromised immune systems. Recognizing these two factors, a proof-of-concept electrochemical method employing a micro-interface between water and oil (w/o) held at the tip of a pulled borosilicate glass capillary is presented. This method targets small molecules produced by P. aeruginosa colonies as signalling factors that control colony growth in a pseudo-multicellular process known as quorum sensing (QS). The QS molecules of interest are 4-hydroxy-2-heptylquinoline (HHQ) and 2-heptyl-3,4-dihydroxyquinoline (PQS, Pseudomonas quinolone signal). Hydrophobic HHQ and PQS molecules, dissolved in the oil phase, were observed electrochemically to facilitate proton transfer across the w/o interface. This interfacial complexation can be exploited as a facile electrochemical detection method for P. aeruginosa and is advantageous as it does not depend on the redox activity of HHQ/PQS. Interestingly, the limit-of-linearity is reached as [H+] ≈ [ligand]. Density functional theory calculations were performed to determine the proton affinities and gas-phase basicities of HHQ/PQS, as well as elucidate the likely site of stepwise protonation within each molecule.
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Affiliation(s)
- Edward D Burgoyne
- The Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland.
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30
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Jiang Q, Reader HE, Stockmann TJ. Electrochemical Characterization of Fe(II) Complexation Reactions at an Electrified Micro Liquid‐Liquid Interface. ChemElectroChem 2021. [DOI: 10.1002/celc.202100127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Qi Jiang
- Department of Chemistry Memorial University of Newfoundland 283 Prince Philip Dr. St. John's NL, A1B 3X7
| | - Heather E. Reader
- Department of Chemistry Memorial University of Newfoundland 283 Prince Philip Dr. St. John's NL, A1B 3X7
| | - Talia Jane Stockmann
- Department of Chemistry Memorial University of Newfoundland 283 Prince Philip Dr. St. John's NL, A1B 3X7
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31
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Morita A, Koizumi A, Hirano T. Recent progress in simulating microscopic ion transport mechanisms at liquid-liquid interfaces. J Chem Phys 2021; 154:080901. [PMID: 33639756 DOI: 10.1063/5.0039172] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Transport of ions through liquid-liquid interfaces is of fundamental importance to a wide variety of applications. However, since it is quite challenging for experimentalists to directly and selectively observe molecules at the interfaces, microscopic mechanisms of ion transport have been largely presumed from kinetic information. This Perspective illustrates recent examples that molecular dynamics simulations with proper free energy surfaces clarified mechanistic pictures of ion transport. The key is a proper choice of coordinates and defining/calculating free energy surfaces in multidimensional space. Once the free energy surfaces for realistic systems are available, they naturally provide new insight into the ion transport in unprecedented details, including water finger, transient ion pairing, and electron transfer.
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Affiliation(s)
- Akihiro Morita
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Ai Koizumi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Tomonori Hirano
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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32
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Fang Y, Deng H, Huang X, Wang L. Ion Selective Detection Based on the Nuances of the Kinetic Fingerprint for Ion Transfer at Soft Interfaces. Anal Chem 2021; 93:3353-3361. [PMID: 33550802 DOI: 10.1021/acs.analchem.0c02266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel approach has been developed for the selective determination of cations or anions based on the application of Fourier transformed staircase sinusoidal voltammetry (FT-SC-SV) in combination with the interface between two immiscible electrolyte solutions (ITIES) in the four-electrode configuration. The electrochemistry at the ITIES provides a very simple yet sensitive platform for the detection of a broad spectrum of redox inactive ions and even the neutral (bio)molecules that can be charged (e.g., protonated in appropriate pH). FT-SC-SV employs a complex potential excitation, i.e., a large-amplitude sine wave superimposed onto a dc bias potential that is stepped/scanned throughout the potential window. The response current is subsequently analyzed in the frequency domain by FT. Although the ions have close standard/formal transfer potential, discrimination and selective detection can be achieved by the higher harmonics. Feasibility and reliability of the proposed approach were verified with two pairs of ions that have very close transfer potentials across the ITIES and were chosen as the model systems. Besides, the additivity of the ionic current magnitude on concentration measured either in the mixture of ionic analytes or in individually prepared solutions containing the separate ionic analyte was tested. The experimental results prove that the principle of additivity holds. Compared with the traditional voltammetry, FT-SC-SV is simpler and more efficient in discrimination and quantification of apparently indistinguishable ion transfer from the viewpoint of thermodynamics. This demonstration may provide a new way for analytical detection of a broad range of redox inactive ions in terms of both fundamentals and applications.
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Affiliation(s)
- Yishan Fang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.,State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China
| | - Haiqiang Deng
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
| | - Xinjian Huang
- Institute of Applied Electronics, Midea Corporate Research Center, Foshan 528311, China
| | - Lishi Wang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
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Moshrefi R, Suryawanshi A, Stockmann TJ. Electrochemically controlled Au nanoparticle nucleation at a micro liquid/liquid interface using ferrocene as reducing agent. Electrochem commun 2021. [DOI: 10.1016/j.elecom.2020.106894] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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34
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Borgul P, Rudnicki K, Chu L, Leniart A, Skrzypek S, Sudhölter EJ, Poltorak L. Layer-by-layer (LbL) assembly of polyelectrolytes at the surface of a fiberglass membrane used as a support of the polarized liquid–liquid interface. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.137215] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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35
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Zannah S, W M Arrigan D. Electrochemistry of catalase at a liquid|liquid micro-interface array. Bioelectrochemistry 2020; 138:107694. [PMID: 33333457 DOI: 10.1016/j.bioelechem.2020.107694] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 10/28/2020] [Accepted: 11/01/2020] [Indexed: 01/18/2023]
Abstract
The electrochemistry of catalase (CAT) was investigated at the interface between two immiscible electrolyte solutions (ITIES) as a step towards its detection. Electrochemistry at the ITIES offers advantages such as the non-redox detection of biomolecules. The electrochemical behaviour of CAT at the ITIES, in a micro-interface array format, displayed a distinct cyclic voltammogram when the aqueous phase pH was lower than the isoelectric point (pI) of CAT. No voltammetric response was observed when the aqueous phase pH > pI of CAT, indicating that neutral or negatively charged CAT has no capability to facilitate anion transfer from the organic phase. Adsorptive stripping voltammetry (AdSV) was assessed for detection of low concentrations at the µITIES array. Application of a positive preconcentration potential for a fixed time enabled interfacial accumulation of CAT as a complex; subsequently, a voltammetric scan to lower potentials desorbed the complex, providing the electroanalytical signal. Assessment of sample matrix effects by examining the electrochemistry of CAT in artificial serum indicated that detection in pH-adjusted samples is feasible. Together, these results demonstrate that CAT is electroactive at the liquid-liquid interface and this may be useful as a strategy to detect and characterize the enzyme in a label-free manner.
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Affiliation(s)
- Shaheda Zannah
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
| | - Damien W M Arrigan
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
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36
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37
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Ametryn detection by proton assisted transfer at a single micro-interface between two immiscible electrolyte solutions. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114745] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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38
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Chen R, Xu K, Shen M. Avocado oil, coconut oil, walnut oil as true oil phase for ion transfer at nanoscale liquid/liquid interfaces. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136788] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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39
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Detection of zwitterion at an electrified liquid-liquid interface: A chemical equilibrium perspective. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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40
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Gao P, Yang X, Tartakovsky AM. Learning Coarse-Grained Potentials for Binary Fluids. J Chem Inf Model 2020; 60:3731-3745. [PMID: 32668158 DOI: 10.1021/acs.jcim.0c00337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For a multiple-fluid system, CG models capable of accurately predicting the interfacial properties as a function of curvature are still lacking. In this work, we propose a new probabilistic machine learning (ML) model for learning CG potentials for binary fluids. The water-hexane mixture is selected as a typical immiscible binary liquid-liquid system. We develop a new CG force field (FF) using the Shinoda-DeVane-Klein (SDK) FF framework and compute parameters in this CG FF using the proposed probabilistic ML method. It is shown that a standard response-surface approach does not provide a unique set of parameters, as it results in a loss function with multiple shallow minima. To address this challenge, we develop a probabilistic ML approach where we compute the probability density function (PDF) of parameters that minimize the loss function. The PDF has a well-defined peak corresponding to a unique set of parameters in the CG FF that reproduces the desired properties of a liquid-liquid interface. We compare the performance of the new CG FF with several existing FFs for the water-hexane mixture, including two atomistic and three CG FFs with respect to modeling the interface structure and thermodynamic properties. It is demonstrated that the new FF significantly improves the CG model prediction of both the interfacial tension and structure for the water-hexane mixture.
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Affiliation(s)
- Peiyuan Gao
- Advanced Computing, Mathematics, and Data Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Xiu Yang
- Department of Industrial and Systems Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Alexandre M Tartakovsky
- Advanced Computing, Mathematics, and Data Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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41
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Rastgar S, Teixeira Santos K, Angelucci CA, Wittstock G. Catalytic Activity of Alkali Metal Cations for the Chemical Oxygen Reduction Reaction in a Biphasic Liquid System Probed by Scanning Electrochemical Microscopy. Chemistry 2020; 26:10882-10890. [PMID: 32460434 PMCID: PMC7496973 DOI: 10.1002/chem.202001967] [Citation(s) in RCA: 5] [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: 04/22/2020] [Revised: 05/24/2020] [Indexed: 12/01/2022]
Abstract
Chemical reduction of dioxygen in organic solvents for the production of reactive oxygen species or the concomitant oxidation of organic substrates can be enhanced by the separation of products and educts in biphasic liquid systems. Here, the coupled electron and ion transfer processes is studied as well as reagent fluxes across the liquid|liquid interface for the chemical reduction of dioxygen by decamethylferrocene (DMFc) in a dichloroethane-based organic electrolyte forming an interface with an aqueous electrolyte containing alkali metal ions. This interface is stabilized at the orifice of a pipette, across which a Galvani potential difference is externally applied and precisely adjusted to enforce the transfer of different alkali metal ions from the aqueous to the organic electrolyte. The oxygen reduction is followed by H2 O2 detection in the aqueous phase close to the interface by a microelectrode of a scanning electrochemical microscope (SECM). The results prove a strong catalytic effect of hydrated alkali metal ions on the formation rate of H2 O2 , which varies systematically with the acidity of the transferred alkali metal ions in the organic phase.
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Affiliation(s)
- Shokoufeh Rastgar
- Carl von Ossietzky University of OldenburgChemistry Department261111OldenburgGermany
| | - Keyla Teixeira Santos
- Carl von Ossietzky University of OldenburgChemistry Department261111OldenburgGermany
- Federal University of ABCCenter for Natural and Human SciencesAv. dos Estados 500109210-580Santo André/SPBrazil
| | - Camilo Andrea Angelucci
- Federal University of ABCCenter for Natural and Human SciencesAv. dos Estados 500109210-580Santo André/SPBrazil
| | - Gunther Wittstock
- Carl von Ossietzky University of OldenburgChemistry Department261111OldenburgGermany
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42
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Qiu H, Jiang T, Wang X, Zhu L, Wang Q, Zhao Y, Ge J, Chen Y. Electrochemical investigation of adsorption of graphene oxide at an interface between two immiscible electrolyte solutions. RSC Adv 2020; 10:25817-25827. [PMID: 35518605 PMCID: PMC9055337 DOI: 10.1039/d0ra02560g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 06/25/2020] [Indexed: 01/18/2023] Open
Abstract
Graphene oxide (GO) has been recognized as an amphiphilic molecule or a soft colloidal particle with the ability to adsorb and assemble at the liquid/liquid (L/L) interface. However, most extant works concerning the adsorption behaviors of GO at the L/L interface have been limited to the non-polarized L/L interface. Here, we studied what would happen if GO nanosheets met with a polarizable L/L interface, namely an interface between two immiscible electrolyte solutions (ITIES). On one hand, the adsorption behavior of GO nanosheets at the L/L interface was electrochemically investigated firstly by using cyclic voltammetry (CV) and alternating current voltammetry (ACV). On the other hand, the influence of the adsorbed GO layers at the L/L interface on the ion transfer reactions was studied by employing ion-transfer voltammetry of TEA+ and ClO4− selected as probe ions. Capacitance measurements show that the interfacial capacitance increases greatly in the presence of GO nanosheets inside the aqueous phase, which can be attributed to the increases of interfacial corrugation and charge density induced by the parallel adsorption and assembly of GO at the L/L interface. In addition, it is found that the application of an interfacial potential difference by external polarization can promote the adsorption of GO at the L/L interface. Moreover, the ion-transfer voltammetric results further demonstrate that the GO layers formed at the interface can suppress the ion transfer reactions due to interfacial blocking and charge screening, as well as the hindrance effect induced by the GO layers. All the results with insights into the interfacial behavior of GO under polarization with an external electric field enable understanding the adsorption behavior of GO at the L/L interface more comprehensively. The adsorption behavior of graphene oxide (GO) nanosheets at an interface between two immiscible electrolyte solutions (ITIES) was electrochemically investigated firstly by using cyclic voltammetry (CV) and alternating current voltammetry (ACV).![]()
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Affiliation(s)
- Haiyan Qiu
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Tao Jiang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Xiaoyuan Wang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Lin Zhu
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Qingwei Wang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Yun Zhao
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
| | - Jianjian Ge
- School of Science, Shanghai Institute of Technology Shanghai 201418 China
| | - Yong Chen
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology Shanghai 201418 China
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43
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Chen R, Alanis K, Welle TM, Shen M. Nanoelectrochemistry in the study of single-cell signaling. Anal Bioanal Chem 2020; 412:6121-6132. [PMID: 32424795 DOI: 10.1007/s00216-020-02655-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 04/02/2020] [Accepted: 04/08/2020] [Indexed: 12/28/2022]
Abstract
Label-free biosensing has been the dream of scientists and biotechnologists as reported by Vollmer and Arnold (Nat Methods 5:591-596, 2008). The ability of examining living cells is crucial to cell biology as noted by Fang (Int J Electrochem 2011:460850, 2011). Chemical measurement with electrodes is label-free and has demonstrated capability of studying living cells. In recent years, nanoelectrodes of different functionality have been developed. These nanometer-sized electrodes, coupled with scanning electrochemical microscopy (SECM), have further enabled nanometer spatial resolution study in aqueous environments. Developments in the field of nanoelectrochemistry have allowed measurement of signaling species at single cells, contributing to better understanding of cell biology. Leading studies using nanoelectrochemistry of a variety of cellular signaling molecules, including redox-active neurotransmitter (e.g., dopamine), non-redox-active neurotransmitter (e.g., acetylcholine), reactive oxygen species (ROS), and reactive nitrogen species (RNS), are reviewed here.
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Affiliation(s)
- Ran Chen
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA
| | - Kristen Alanis
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA
| | - Theresa M Welle
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA
| | - Mei Shen
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA.
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44
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Kasuno M, Wakabayashi K, Matsuyama Y, Yamamura R. Ion transfer voltammetry at the interface of water and low dielectric constant organic solutions. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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45
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Koizumi A, Tahara H, Hirano T, Morita A. Revealing Transient Shuttling Mechanism of Catalytic Ion Transport through Liquid-Liquid Interface. J Phys Chem Lett 2020; 11:1584-1588. [PMID: 32020807 DOI: 10.1021/acs.jpclett.9b03742] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Hard, hydrophilic ions that hardly transport over the water-oil interface by imposing external electric potential could undergo facile transport with a trace of ligand. Such phenomena, called "shuttling", are elucidated by microscopic investigation with molecular dynamics simulations. The catalytic role manifests itself in a 2-D free-energy surface within the nanometer range of the interface. The free-energy landscape clearly distinguishes the condition that the catalytic shuttling plays a vital role in the ion transport. The mechanism associated with transient complex formation at the interface is shown to be widely relevant to the ion kinetics and extends the conventional concept of facilitated ion transport.
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Affiliation(s)
- Ai Koizumi
- Department of Chemistry, Graduate School of Science , Tohoku University , Sendai 980-8578 , Japan
| | - Hirofumi Tahara
- Department of Chemistry, Graduate School of Science , Tohoku University , Sendai 980-8578 , Japan
| | - Tomonori Hirano
- Department of Chemistry, Graduate School of Science , Tohoku University , Sendai 980-8578 , Japan
| | - Akihiro Morita
- Department of Chemistry, Graduate School of Science , Tohoku University , Sendai 980-8578 , Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) , Kyoto University , Kyoto 615-8520 , Japan
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46
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Probing non-polarizable liquid/liquid interfaces using scanning ion conductance microscopy. Sci China Chem 2020. [DOI: 10.1007/s11426-019-9661-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Chen R, Yang A, Chang A, Oweimrin PF, Romero J, Vichitcharoenpaisarn P, Tapia S, Ha K, Villaflor C, Shen M. A Newly Synthesized Tris(crown ether) Ionophore for Assisted Ion Transfer at NanoITIES Electrodes. ChemElectroChem 2020. [DOI: 10.1002/celc.201901997] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ran Chen
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Anna Yang
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Albert Chang
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Philip F. Oweimrin
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Julian Romero
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | | | - Stephanie Tapia
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Kevin Ha
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Christopher Villaflor
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Mei Shen
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
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48
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Electrochemical Behavior and Detection of Diclofenac at a Microporous Si3N4 Membrane Modified Water–1,6-dichlorohexane Interface System. CHEMOSENSORS 2020. [DOI: 10.3390/chemosensors8010011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The electrochemical behavior when the liquid–liquid interface was modified by commercially available, microporous silicon nitride membrane, was achieved using cyclic voltammetry with tetramethyl ammonium. The transfer characteristics of the ionizable drug diclofenac ( DCF − ), as an anti-inflammatory, anti-rheumatic, antipyretic, and analgesic treatment in common use in biomedical applications, were also investigated across microporous silicon nitride-modified liquid interface. Thus, some thermodynamic variables for DCF − , such as the standard Gibbs energy of transfer, the standard transfer potential and lipophilicity were estimated. Furthermore, the influence of possible interfering substances (ascorbic acid, sugar, amino acid, urea, and metal ions) on the detection of DCF − was investigated. An electrochemical DCF sensor is investigated using differential pulse voltammetry (DPV) as the quantification technique, a linear range of 8–56 µM and a limit of detection of 1.5 µM was possible due to the miniaturized interfaces formed within silicon nitride.
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49
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Terry Weatherly CK, Ren H, Edwards MA, Wang L, White HS. Coupled Electron- and Phase-Transfer Reactions at a Three-Phase Interface. J Am Chem Soc 2019; 141:18091-18098. [PMID: 31621317 DOI: 10.1021/jacs.9b07283] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Coupled electron- and phase-transfer reactions are fundamentally important in electrochemical energy conversion and storage, e.g., intercalation of Li+ in batteries and electrochemistry at the three-phase boundary in fuel cells. The mechanism, energetics, and kinetics of these complex reactions play an important role in device performance. Herein, we describe experimental methodology to quantitatively investigate coupled electron- and phase-transfer reactions at an individual, geometrically well-defined, three-phase interface. Specifically, a Pt-Ir wire electrode is placed across a H2O/1,2-dichloroethane (DCE) interface, creating a Pt-Ir/H2O/DCE boundary that is defined mathematically by a line around the surface of the wire. We investigated the oxidation of ferrocene (Fc), initially present in DCE (but essentially insoluble in water), at the three-phase boundary, and the transfer of its charged reaction product ferrocenium (Fc+) across the interface into the aqueous phase. In cyclic voltammetry, a reversible wave at E1/2 ∼ 0.58 V is observed for Fc oxidation in DCE on the first scan. The Fc+ produced near the H2O/DCE interface transfers into the aqueous phase. On the second and subsequent cycles, a second reversible wave at more negative potentials, E1/2 ∼ 0.33 V, is observed, corresponding to the reduction of Fc+ (and reoxidation back to Fc) in the aqueous phase. Finite-element simulations quantitatively capture the voltammetric response of coupled electron and phase transfer at the three-phase interface and indicate that the electrochemical response observed in the aqueous phase occurs within ∼200 μm of the Pt-Ir/H2O/DCE boundary. Finally, we demonstrate that the rate of transfer of Fc+ is strongly dependent on the concentration of supporting electrolyte, reaching a maximum at an intermediate electrolyte concentration, suggesting a critical role of the electric field distribution in determining the reaction rates at the three-phase interface.
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Affiliation(s)
| | - Hang Ren
- Department of Chemistry , University of Utah , Salt Lake City , Utah 84112 , United States
| | - Martin A Edwards
- Department of Chemistry , University of Utah , Salt Lake City , Utah 84112 , United States
| | - Li Wang
- Department of Chemistry , University of Utah , Salt Lake City , Utah 84112 , United States
| | - Henry S White
- Department of Chemistry , University of Utah , Salt Lake City , Utah 84112 , United States
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50
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Gu C, Nie X, Jiang J, Chen Z, Dong Y, Zhang X, Liu J, Yu Z, Zhu Z, Liu J, Liu X, Shao Y. Mechanistic Study of Oxygen Reduction at Liquid/Liquid Interfaces by Hybrid Ultramicroelectrodes and Mass Spectrometry. J Am Chem Soc 2019; 141:13212-13221. [PMID: 31353892 DOI: 10.1021/jacs.9b06299] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proton-coupled electron transfer (PCET) reactions at various interfaces (liquid/membrane, solid/electrolyte, liquid/liquid) lie at the heart of many processes in biology and chemistry. Mechanistic study can provide profound understanding of PCET and rational design of new systems. However, most mechanisms of PCET reactions at a liquid/liquid interface have been proposed based on electrochemical and spectroscopic data, which lack direct evidence for possible intermediates. Moreover, a liquid/liquid interface as one type of soft interface is dynamic, making the investigation of interfacial reactions very challenging. Herein a novel electrochemistry method coupled to mass spectrometry (EC-MS) was introduced for in situ study of the oxygen reduction reaction (ORR) by ferrocene (Fc) under catalysis from cobalt tetraphenylporphine (CoTPP) at liquid/liquid interfaces. The key units are two types of gel hybrid ultramicroelectrodes (agar-gel/organic hybrid ultramicroelectrodes and water/PVC-gel hybrid ultramicroelectrodes), which were made based on dual micro- or nanopipettes. A solidified liquid/liquid interface can be formed at the tip of these pipettes, and it serves as both an electrochemical cell and a nanospray emitter for mass spectrometry. We demonstrated that the solidified L/L interfaces were very similar to typical L/L interfaces. Key CoTPP intermediates of the ORR at the liquid/liquid interfaces were identified for the first time, and the four-electron oxygen reduction pathway predominated, which provides valuable insights into the mechanism of the ORR. Theoretical simulation has further supported the possibility of formation of intermediates. This type of platform is promising for in situ tracking and identifying intermediates to study complicated reactions at liquid/liquid interfaces or other soft interfaces.
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Affiliation(s)
- Chaoyue Gu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Xin Nie
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Jiezhang Jiang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Zifei Chen
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Yifan Dong
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Xin Zhang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Junjie Liu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Zhengyou Yu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Zhiwei Zhu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Jian Liu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Xiaoyun Liu
- Department of Microbiology, School of Basic Medical Sciences , Peking University Health Science Center , Beijing 100191 , China
| | - Yuanhua Shao
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
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