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Mondal J, Maji D, Biswas R. Temperature-dependent dielectric relaxation measurements of (acetamide + K/Na SCN) deep eutectic solvents: Decoding the impact of cation identity via computer simulations. J Chem Phys 2024; 160:084506. [PMID: 38421071 DOI: 10.1063/5.0193512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 02/07/2024] [Indexed: 03/02/2024] Open
Abstract
The impact of successive replacement of K+ by Na+ on the megahertz-gigahertz polarization response of 0.25[fKSCN + (1 - f)NaSCN] + 0.75CH3CONH2 deep eutectic solvents (DESs) was explored via temperature-dependent (303 ≤ T/K ≤ 343) dielectric relaxation (DR) measurements and computer simulations. Both the DR measurements (0.2 ≤ ν/GHz ≤ 50) and the simulations revealed multi-Debye relaxations accompanied by a decrease in the solution static dielectric constant (ɛs) upon the replacement of K+ by Na+. Accurate measurements of the DR response of DESs below 100 MHz were limited by the well-known one-over-frequency divergence for conducting solutions. This problem was tackled in simulations by removing the zero frequency contributions arising from the ion current to the total simulated DR response. The temperature-dependent measurements revealed a much stronger viscosity decoupling of DR times for Na+-containing DES than for the corresponding K+ system. The differential scanning calorimetry measurements indicated a higher glass transition temperature for Na+-DES (∼220 K) than K+-DES (∼200 K), implying more fragility and cooperativity for the former (Na+-DES) than the latter. The computer simulations revealed a gradual decrease in the average number of H bonds (⟨nHB⟩) per acetamide molecule and increased frustrations in the average orientational order upon the replacement of K+ by Na+. Both the measured and simulated ɛs values were found to decrease linearly with ⟨nHB⟩. Decompositions of the simulated DR spectra revealed that the cation-dependent cross interaction (dipole-ion) term contributes negligibly to ɛs and appears in the terahertz regime. Finally, the simulated collective single-particle reorientational relaxations and the structural H-bond fluctuation dynamics revealed the microscopic origin of the cation identity dependence shown by the measured DR relaxation times.
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Affiliation(s)
- Jayanta Mondal
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Dhrubajyoti Maji
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Ranjit Biswas
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
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2
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Hioki M, Nakagawa Y, Sato T. Presence of bicontinuous microemulsion-type domains and dielectrically inert interfacial water layers in lamellar gel-stabilized oil-in-water emulsions. J Colloid Interface Sci 2023; 651:829-840. [PMID: 37573729 DOI: 10.1016/j.jcis.2023.08.023] [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: 04/11/2023] [Revised: 08/01/2023] [Accepted: 08/05/2023] [Indexed: 08/15/2023]
Abstract
HYPOTHESIS Lamellar gels are widely formulated in household and cosmetic products because of their eminent ability to improve long-term stability of thermodynamically unstable oil-in-water emulsions. However, despite long study, how and why membrane internal structure and membrane-membrane interactions are modified by the presence of polar and nonpolar oils remains elusive. EXPERIMENTS Using small- and wide-angle X-ray scattering, dielectric spectroscopy, and field-emission transmission electron microscope, we investigate intermembrane interactions and water-mediated microscopic interfacial properties in lamellar gels and lamellar gel-stabilized oil-in-water emulsions based on cetyltrimethylammonium chloride and 1-hexadecanol. FINDINGS Reducing membrane surface charge density enhances undulation fluctuation disorder, resulting in a crossover of dominant interactions from electrostatic double-layer repulsion to Helfrich interaction. Oil-emulsification induces similar structural impacts to the reduced 1-hexadecanol ratio, confirming preferential dissolution of higher-alcohol in oil phases. An emerging Teubner-Stray scattering component upon emulsification of nonpolar oil evidences that oil droplets and lamellar gels are indirectly connected via bicontinuous microemulsion-type domains. Dielectric spectra reveal strikingly small water permittivity in the lamellar gel and emulsion samples, which is quantitatively explained by a cumulative effect of a dielectrically inert interfacial thin water layer (<1nm) and a highly polarizable bulk-like water layer. This phenomenon appears to be intrinsic to diverse lamellar stack architectures.
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Affiliation(s)
- Marino Hioki
- Beauty Care Laboratory, Kracie Home Products, Ltd., 134 Goudo-cho, Hodogaya-Ku, Yokohama-City, Kanagawa 240-0005, Japan
| | - Yasuharu Nakagawa
- Beauty Care Laboratory, Kracie Home Products, Ltd., 134 Goudo-cho, Hodogaya-Ku, Yokohama-City, Kanagawa 240-0005, Japan.
| | - Takaaki Sato
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan.
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3
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Galindo C, Teope RV, Tarabeih L, Ben Ishai P, Feldman Y. Microwave Dielectric Relaxation of Univalent and Bivalent Electrolyte Solutions. J Phys Chem B 2023; 127:10003-10015. [PMID: 37963828 DOI: 10.1021/acs.jpcb.3c05221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
The microwave dielectric relaxation of aqueous solutions of univalent (KCl, NaCl, NaI) and bivalent (CaCl2, MgCl2) electrolytes at concentrations between 0.1 and 1 M at 25 °C was investigated using a vector network analyzer (0.5≤ ν ≤ 40 GHz). The spectra of these electrolyte systems are characterized by a symmetrical broadening of the main relaxation peak and were fitted using the Cole-Cole equation. In our analysis, we provide insights into the underlying physics of the relaxation events at microscopic and mesoscopic scales by using a 3D phase space trajectory that is based on the interactions of the relaxing dipole units with their surroundings and Frohlich's B function. The effect of the solutes on the H-bond network of water with increasing concentration is evident in the microwave dielectric spectra through decreasing dielectric strengths and relaxation times. It was found that the number of perturbed water molecules is higher in the case of bivalent electrolytes and appears to be proportional to the ionic radius. In our approach, the particular dependence between the broadening parameter α and the relaxation times τ reflects the rate of interactions between the elementary dipole units and their surroundings. We provide a quantitative analysis of the level of perturbation caused by the presence of ions in the hydrogen-bond network of water. It was found that the H-bonded network of water is highly perturbed in univalent systems compared to bivalent systems due to weaker bonded hydration shells. Finally, we found significant differences between the dielectric response of NaCl and NaI. The differences, originating in the counterions Cl- and I-, which are characterized by large ionic radii and consequently weaker electric fields in their vicinity, confirm that the effect of weakly hydrated ions should not be neglected in microwave dielectric spectra analysis.
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Affiliation(s)
- Cindy Galindo
- The Hebrew University of Jerusalem, Institute of Applied Physics, Jerusalem 9190401, Israel
| | - Rodolfo Victor Teope
- The Hebrew University of Jerusalem, Institute of Applied Physics, Jerusalem 9190401, Israel
| | - Lama Tarabeih
- The Hebrew University of Jerusalem, Institute of Applied Physics, Jerusalem 9190401, Israel
| | - Paul Ben Ishai
- Department of Physics, Ariel University, Kyriat Hamada St. 3, 40700 Ariel, Israel
| | - Yuri Feldman
- The Hebrew University of Jerusalem, Institute of Applied Physics, Jerusalem 9190401, Israel
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4
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Maji D, Biswas R. Dielectric relaxation and dielectric decrement in ionic acetamide deep eutectic solvents: Spectral decomposition and comparison with experiments. J Chem Phys 2023; 158:2888209. [PMID: 37139998 DOI: 10.1063/5.0147378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 04/17/2023] [Indexed: 05/05/2023] Open
Abstract
Frequency-dependent dielectric relaxation in three deep eutectic solvents (DESs), (acetamide+LiClO4/NO3/Br), was investigated in the temperature range, 329 ≤ T/K ≤ 358, via molecular dynamics simulations. Subsequently, decomposition of the real and the imaginary components of the simulated dielectric spectra was carried out to separate the rotational (dipole-dipole), translational (ion-ion), and ro-translational (dipole-ion) contributions. The dipolar contribution, as expected, was found to dominate all the frequency-dependent dielectric spectra over the entire frequency regime, while the other two components together made tiny contributions only. The translational (ion-ion) and the cross ro-translational contributions appeared in the THz regime in contrast to the viscosity-dependent dipolar relaxations that dominated the MHz-GHz frequency window. Our simulations predicted, in agreement with experiments, anion-dependent decrement of the static dielectric constant (ɛs ∼ 20 to 30) for acetamide (ɛs ∼ 66) in these ionic DESs. Simulated dipole-correlations (Kirkwood g factor) indicated significant orientational frustrations. The frustrated orientational structure was found to be associated with the anion-dependent damage of the acetamide H-bond network. Single dipole reorientation time distributions suggested slowed down acetamide rotations but did not indicate presence of any "rotationally frozen" molecule. The dielectric decrement is, therefore, largely static in origin. This provides a new insight into the ion dependence of the dielectric behavior of these ionic DESs. A good agreement between the simulated and the experimental timescales was also noticed.
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Affiliation(s)
- Dhrubajyoti Maji
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector III, Salt Lake, Kolkata, West Bengal 700106, India
| | - Ranjit Biswas
- Department of Chemical and Biological Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector III, Salt Lake, Kolkata, West Bengal 700106, India
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5
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Peychev B, Slavchov RI. Interactions between Small Inorganic Ions and Uncharged Monolayers on the Water/Air Interface. J Phys Chem B 2023; 127:2801-2817. [PMID: 36930736 PMCID: PMC10068745 DOI: 10.1021/acs.jpcb.2c08019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
The interaction of several simple electrolytes with uncharged insoluble monolayers is studied on the basis of tensiometric and potentiometric data for the surface electrolyte solution|air. The induced adsorption of electrolyte on the monolayer is determined via a combination of data for equilibrium spreading pressure and surface pressure versus area isotherms. We show that the monolayer-induced adsorption of electrolyte is not only strongly ion-specific but also surfactant-specific. The comparison between the ion-specific effects on a carboxylic acid monolayer at low pH and an ester monolayer shows that the anion series follows the same order while the cation series reverses. The effect of the electrolyte on the chemical potential of the monolayer shows attraction between the surfactant and the ions at low monolayer densities, but at high surface densities, repulsion seems to come into play. In nearly all investigated cases, a maximum of monolayer-induced electrolyte adsorption is observed at intermediate monolayer densities. This suggests specific interactions between the surfactant headgroup and the ions. The Volta potential data for the monolayers are analyzed on the basis of the equations of quadrupolar electrostatics. The analysis suggests that the ion-specific effect on the Volta potential is due to the ion-specific decrement of the bulk dielectric constant of the electrolyte solution. Moreover, we present evidence that in most cases the effect of the electrolyte on the orientation of the adsorbed dipoles cannot be neglected. Instead, the change in the ion distribution in the electric double layer seems to have a small effect on the Volta potential.
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Affiliation(s)
- Boyan Peychev
- Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom
| | - Radomir I Slavchov
- Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom
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6
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Polarizable force fields for accurate molecular simulations of aqueous solutions of electrolytes, crystalline salts, and solubility: Li+, Na+, K+, Rb+, F−, Cl−, Br−, I−. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Singh A, Doan LC, Lou D, Wen C, Vinh NQ. Interfacial Layers between Ion and Water Detected by Terahertz Spectroscopy. J Chem Phys 2022; 157:054501. [DOI: 10.1063/5.0095932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Dynamic fluctuations in hydrogen-bond network of water occur from femto- to nano-second timescale and provides insights into structural/dynamical aspects of water at ion-water interfaces. Employing terahertz spectroscopy assisted with molecular dynamics simulations, we study aqueous chloride solutions of five monovalent cations, namely, Li, Na, K, Rb and Cs. We show that ions modify the behavior of surrounding water molecules and form interfacial layers of water around them with physical properties distinct from that of bulk water. Small cations with high charge densities influence the kinetics of water well beyond the first solvation shell. At terahertz frequencies, we observe an emergence of fast relaxation processes of water with their magnitude following the ionic order Cs>Rb>K>Na>Li, revealing an enhanced population density of weakly coordinated water at ion-water interface. The results shed light on the structure breaking tendency of monovalent cations and provide insights into the properties of ionic solutions at the molecular level.
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Affiliation(s)
- Abhishek Singh
- Physics, Virginia Polytechnic Institute and State University, United States of America
| | - Luan C Doan
- Virginia Polytechnic Institute and State University, United States of America
| | - Djamila Lou
- Virginia Polytechnic Institute and State University, United States of America
| | - Chengyuan Wen
- Virginia Polytechnic Institute and State University - National Capital Region, United States of America
| | - Nguyen Q Vinh
- Department of Physics, Virginia Polytechnic Institute and State University, United States of America
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8
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Jiang L, Zhang K, Yao Y, Li S, Li J, Tian Z, Zhang W. Terahertz optoacoustic detection of aqueous salt solutions. iScience 2022; 25:104668. [PMID: 35832895 PMCID: PMC9272373 DOI: 10.1016/j.isci.2022.104668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 05/30/2022] [Accepted: 06/21/2022] [Indexed: 11/29/2022] Open
Affiliation(s)
- Liwen Jiang
- School of Precision Instruments and Optoelectronics Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Center for Terahertz Waves, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), No.92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Ke Zhang
- School of Precision Instruments and Optoelectronics Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Center for Terahertz Waves, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), No.92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Yixin Yao
- School of Precision Instruments and Optoelectronics Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Center for Terahertz Waves, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), No.92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Shuai Li
- School of Precision Instruments and Optoelectronics Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Jiao Li
- School of Precision Instruments and Optoelectronics Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Corresponding author
| | - Zhen Tian
- School of Precision Instruments and Optoelectronics Engineering, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Center for Terahertz Waves, Tianjin University, No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), No.92 Weijin Road, Nankai District, Tianjin 300072, China
- Corresponding author
| | - Weili Zhang
- School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, OK 74078, USA
- Corresponding author
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9
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Liese S, Schlaich A, Netz RR. Dielectric Constant of Aqueous Solutions of Proteins and Organic Polymers from Molecular Dynamics Simulations. J Chem Phys 2022; 156:224902. [DOI: 10.1063/5.0089397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dielectric constant of water/oligomer mixtures, spanning the range from pure water to pure oligomeric melts, is investigated using molecular dynamics (MD) simulations. As prototypical water-soluble organic substances we consider neutral poly-glycine, poly-ethylene glycol and charged monomeric propanic acid. As the water content is reduced, the dielectric constant decreases but does not follow an ideal mixing behavior. The deviations from ideal mixing originate primarily in the non-linear relation between the oligomer mass fraction and collective polarization effects. We find that the dielectric constant is dominated by water polarization, even if the oligomer mass fraction exceeds 50%. By a double extrapolation of the MD simulation results to the limit of vanishing water fraction and to the limit of infinite oligomeric chain length, we estimate the orientational contribution to the dielectric constant of the pure polymeric melts. By this procedure, we obtain ε = 17 {plus minus} 2 for polyglycine and ε = 1 {plus minus} 0.3 for polyethylene glycol. The large difference is rationalized by polarization correlations of glycine units. Interestingly, we find constant temperature simulations to outperform replica exchange simulations in terms of equilibration speed.
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Affiliation(s)
- Susanne Liese
- University of Augsburg Institute of Physics, Germany
| | | | - Roland R. Netz
- Physics, Freie Universitat Berlin Fachbereich Physik, Germany
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10
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Buyukdagli S. Explicit solvent theory of salt-induced dielectric decrement. Phys Chem Chem Phys 2022; 24:13976-13987. [DOI: 10.1039/d2cp00853j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Within the framework of an electrolyte model composed of structured solvent molecules and salt ions coupled by electrostatic and hard-core interactions, we characterize the physical mechanism behind salt-induced dielectric decrement.
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11
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Zimmermann J, Budde K, Arbeiter N, Molina F, Storch A, Uhrmacher AM, van Rienen U. Using a Digital Twin of an Electrical Stimulation Device to Monitor and Control the Electrical Stimulation of Cells in vitro. Front Bioeng Biotechnol 2021; 9:765516. [PMID: 34957068 PMCID: PMC8693021 DOI: 10.3389/fbioe.2021.765516] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 11/01/2021] [Indexed: 12/12/2022] Open
Abstract
Electrical stimulation for application in tissue engineering and regenerative medicine has received increasing attention in recent years. A variety of stimulation methods, waveforms and amplitudes have been studied. However, a clear choice of optimal stimulation parameters is still not available and is complicated by ambiguous reporting standards. In order to understand underlying cellular mechanisms affected by the electrical stimulation, the knowledge of the actual prevailing field strength or current density is required. Here, we present a comprehensive digital representation, a digital twin, of a basic electrical stimulation device for the electrical stimulation of cells in vitro. The effect of electrochemical processes at the electrode surface was experimentally characterised and integrated into a numerical model of the electrical stimulation. Uncertainty quantification techniques were used to identify the influence of model uncertainties on relevant observables. Different stimulation protocols were compared and it was assessed if the information contained in the monitored stimulation pulses could be related to the stimulation model. We found that our approach permits to model and simulate the recorded rectangular waveforms such that local electric field strengths become accessible. Moreover, we could predict stimulation voltages and currents reliably. This enabled us to define a controlled stimulation setting and to identify significant temperature changes of the cell culture in the monitored voltage data. Eventually, we give an outlook on how the presented methods can be applied in more complex situations such as the stimulation of hydrogels or tissue in vivo.
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Affiliation(s)
- Julius Zimmermann
- Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
| | - Kai Budde
- Institute for Visual and Analytic Computing, University of Rostock, Rostock, Germany
| | - Nils Arbeiter
- Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
| | - Francia Molina
- Department of Neurology, University of Rostock, Rostock, Germany
| | - Alexander Storch
- Department of Neurology, University of Rostock, Rostock, Germany
| | - Adelinde M Uhrmacher
- Institute for Visual and Analytic Computing, University of Rostock, Rostock, Germany.,Department Life, Light and Matter, University of Rostock, Rostock, Germany
| | - Ursula van Rienen
- Institute of General Electrical Engineering, University of Rostock, Rostock, Germany.,Department Life, Light and Matter, University of Rostock, Rostock, Germany.,Department Ageing of Individuals and Society, University of Rostock, Rostock, Germany
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12
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Delcompare-Rodriguez PA, Seriani N. Ultrathin space charge layer in hematite photoelectrodes: A theoretical investigation. J Chem Phys 2021; 155:114701. [PMID: 34551523 DOI: 10.1063/5.0060417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The space charge layer in hematite photoelectrodes has been analyzed by means of Poisson-Boltzmann equations, the Stern model, and density functional theory, in view of its application for photoelectrochemical water oxidation. The width of the space charge layer can be smaller than ∼10 Å under experimental conditions. In this regime, a substantial part of the potential drop takes place in the Helmholtz layer, leading to important corrections to the Mott-Schottky behavior of the space charge layer capacitance. These results shed light on an unexpected regime of high photoelectrocatalytic efficiency, different from the classical picture of the electrochemical interface of a semiconducting photocatalyst, which is also amenable to direct study by quantum-mechanical atomistic simulations. Density functional theory has been used to calculate the band bending (BB) in the space charge layer in atomistic models of pristine stoichiometric and hydroxylated surfaces. These surface terminations display BBs of 0.14 and 0.49 eV, respectively, with an increasing width of the space charge layer, however still in the sub-nanometer regime. This work shows that, at high doping, the width of the space charge layer of a hematite photoelectrode can become comparable with interatomic distances.
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Affiliation(s)
| | - N Seriani
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
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13
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Loche P, Steinbrunner P, Friedowitz S, Netz RR, Bonthuis DJ. Transferable Ion Force Fields in Water from a Simultaneous Optimization of Ion Solvation and Ion-Ion Interaction. J Phys Chem B 2021; 125:8581-8587. [PMID: 34292738 PMCID: PMC8389903 DOI: 10.1021/acs.jpcb.1c05303] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The poor performance
of many existing nonpolarizable ion force
fields is typically blamed on either the lack of explicit polarizability,
the absence of charge transfer, or the use of unreduced Coulomb interactions.
However, this analysis disregards the large and mostly unexplored
parameter range offered by the Lennard-Jones potential. We use a global
optimization procedure to develop water-model-transferable force fields
for the ions K+, Na+, Cl–,
and Br– in the complete parameter space of all Lennard-Jones
interactions using standard mixing rules. No extra-thermodynamic assumption
is necessary for the simultaneous optimization of the four ion pairs.
After an optimization with respect to the experimental solvation free
energy and activity, the force fields reproduce the concentration-dependent
density, ionic conductivity, and dielectric constant with high accuracy.
The force field is fully transferable between simple point charge/extended
and transferable intermolecular potential water models. Our results
show that a thermodynamically consistent force field for these ions
needs only Lennard-Jones and standard Coulomb interactions.
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Affiliation(s)
- Philip Loche
- Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
| | | | - Sean Friedowitz
- Department of Materials Science and Engineering, Stanford University, Stanford 94305, California, United States
| | - Roland R Netz
- Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
| | - Douwe Jan Bonthuis
- Institute of Theoretical and Computational Physics, Graz University of Technology, 8010 Graz, Austria
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14
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Le T, Tran NT. The Nonlinear Decrement in Static Permittivity of Electrolytes in High-Polarity Solvents. J SOLUTION CHEM 2021. [DOI: 10.1007/s10953-020-01045-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Yoon TJ, Vigil MJ, Raby EY, Singh RP, Maerzke KA, Currier RP, Findikoglu AT. Dielectric relaxation of neodymium chloride in water and in methanol. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Saric D, Kohns M, Vrabec J. Dielectric constant and density of aqueous alkali halide solutions by molecular dynamics: A force field assessment. J Chem Phys 2020; 152:164502. [PMID: 32357782 DOI: 10.1063/1.5144991] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The concentration dependence of the dielectric constant and the density of 11 aqueous alkali halide solutions (LiCl, NaCl, KCl, RbCl, CsCl, LiI, NaI, KI, CsI, KF, and CsF) is investigated by molecular simulation. Predictions using eight non-polarizable ion force fields combined with the TIP4P/ε water model are compared to experimental data. The influence of the water model and the temperature on the results for the NaCl brine are also addressed. The TIP4P/ε water model improves the accuracy of dielectric constant predictions compared to the SPC/E water model. The solution density is predicted well by most ion models. Almost all ion force fields qualitatively capture the decline of the dielectric constant with the increase of concentration for all solutions and with the increase of temperature for NaCl brine. However, the sampled dielectric constant is mostly in poor quantitative agreement with experimental data. These results are related to the microscopic solution structure, ion pairing, and ultimately the force field parameters. Ion force fields with excessive contact ion pairing and precipitation below the experimental solubility limit generally yield higher dielectric constant values. An adequate reproduction of the experimental solubility limit should therefore be a prerequisite for further investigations of the dielectric constant of aqueous electrolyte solutions by molecular simulation.
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Affiliation(s)
- Denis Saric
- Thermodynamics and Energy Technology, University of Paderborn, 33098 Paderborn, Germany
| | - Maximilian Kohns
- Laboratory of Engineering Thermodynamics, Technische Universität Kaiserslautern, 67633 Kaiserslautern, Germany
| | - Jadran Vrabec
- Thermodynamics and Process Engineering, Technical University Berlin, 10587 Berlin, Germany
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17
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Caduff A, Ben Ishai P, Feldman Y. Continuous noninvasive glucose monitoring; water as a relevant marker of glucose uptake in vivo. Biophys Rev 2019; 11:1017-1035. [PMID: 31741172 DOI: 10.1007/s12551-019-00601-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 10/13/2019] [Indexed: 01/22/2023] Open
Abstract
With diabetes set to become the number 3 killer in the Western hemisphere and proportionally growing in other parts of the world, the subject of noninvasive monitoring of glucose dynamics in blood remains a "hot" topic, with the involvement of many groups worldwide. There is a plethora of techniques involved in this academic push, but the so-called multisensor system with an impedance-based core seems to feature increasingly strongly. However, the symmetrical structure of the glucose molecule and its shielding by the smaller dipoles of water would suggest that this option should be less enticing. Yet there is enough phenomenological evidence to suggest that impedance-based methods are truly sensitive to the biophysical effects of glucose variations in the blood. We have been trying to answer this very fundamental conundrum: "Why is impedance or dielectric spectroscopy sensitive to glucose concentration changes in the blood and why can this be done over a very broad frequency band, including microwaves?" The vistas for medical diagnostics are very enticing. There have been a significant number of papers published that look seriously at this problem. In this review, we want to summarize this body of research and the underlying mechanisms and propose a perspective toward utilizing the phenomena. It is our impression that the current world view on the dielectric response of glucose in solution, as outlined below, will support the further evolution and implementation toward practical noninvasive glucose monitoring solutions.
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Affiliation(s)
- Andreas Caduff
- Applied Physics Department and the Center for Electromagnetic Research and Characterization, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
| | - Paul Ben Ishai
- Department of Physics, Ariel University, 40700, Ariel, Israel
| | - Yuri Feldman
- Applied Physics Department and the Center for Electromagnetic Research and Characterization, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel.
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19
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Measuring ion-pairing and hydration in variable charge supramolecular cages with microwave microfluidics. Commun Chem 2019. [DOI: 10.1038/s42004-019-0157-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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20
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Biswas S, Mallik BS. Heterogeneous Occupancy and Vibrational Dynamics of Spatially Patterned Water Molecules. J Phys Chem B 2019; 123:4278-4290. [PMID: 31018092 DOI: 10.1021/acs.jpcb.9b00271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We performed first-principles molecular dynamics simulations of relatively dilute aqueous solutions of sulfate and thiosulfate dianions to analyze the structure, dynamics, and vibrational spectral properties of water molecules around the solute, especially the spatially patterned solvent molecules in the first solvation layer and the extended layers. This study also involves the investigation of dynamics of dangling OH groups in these layers and their role in patterning the water molecules around the dianions. Structural evaluation of the systems is carried out by radial distribution functions, number integrals, and spatial distribution functions. The lifetime of dangling OH groups inside the solvation shell is compared more to that of the bulk. By constructing the O-H groups in three ensembles (S1, S2, and S3) around the anion, we show that the frequency distribution of OH modes in the S1 ensemble show red-shifting for both sulfate and thiosulfate. The O-H groups in the S2 ensemble of the sulfate-water system show red-shifting by 10 cm-1, while in the case of thiosulfate-water, these O-H groups show blue-shifting by 8 cm-1. The water molecules in S1 and S2 subensembles have slower dynamics compared to those in the bulk (S3). The dynamics of various kinds of hydrogen bonds were characterized by hydrogen bond population correlation functions. The spectral diffusion of solvation shell O-H modes was performed through a frequency-time correlation function. We find a significant amount of orientational retardation of water molecules in the S1 layer and moderate retardation in the S2 layer as compared to that in the bulk, S3 layer. All these findings, the red shift of the OH stretching frequency in S1 and S2 layers, slowing down of the orientational dynamics of OH vectors in S1 and S2 layers, and less diffusivity of water in S1 and S2 layers, show the long-range kosmotropic effect of multivalent sulfate and thiosulfate oxyanions. Due to the long-range effect, heterogeneous occupancy of water molecules is observed, and the water molecules are found to arrange in a patterned manner in the vicinity of anions with varied local density.
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Affiliation(s)
- Sohag Biswas
- Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, Sangareddy 502285 , Telangana , India
| | - Bhabani S Mallik
- Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, Sangareddy 502285 , Telangana , India
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21
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Purvis LAB, Valkovič L, Robson MD, Rodgers CT. Feasibility of absolute quantification for 31 P MRS at 7 T. Magn Reson Med 2019; 82:49-61. [PMID: 30892732 PMCID: PMC6492160 DOI: 10.1002/mrm.27729] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 02/12/2019] [Accepted: 02/14/2019] [Indexed: 12/24/2022]
Abstract
Purpose Phosphorus spectroscopy can differentiate among liver disease stages and types. To quantify absolute concentrations of phosphorus metabolites, sensitivity calibration and transmit field (B1+) correction are required. The trend toward ultrahigh fields (7 T) and the use of multichannel RF coils makes this ever more challenging. We investigated the constraints on reference phantoms, and implemented techniques for the absolute quantification of human liver phosphorus spectra acquired using a 10‐cm loop and a 16‐channel array at 7 T. Methods The effect of phantom conductivity was assessed at 25.8 MHz (1.5 T), 49.9 MHz (3 T), and 120.3 MHz (7 T) by electromagnetic modeling. Radiofrequency field maps (B1±) were measured in phosphate phantoms (18 mM and 40 mM) at 7 T. These maps were used to assess the correction of 4 phantom 3D‐CSI data sets using 3 techniques: phantom replacement, explicit normalization, and simplified normalization. In vivo liver spectra acquired with a 10‐cm loop were corrected with all 3 methods. Simplified normalization was applied to in vivo 16‐channel array data sets. Results Simulations show that quantification errors of less than 3% are achievable using a uniform electrolyte phantom with a conductivity of 0.23‐0.86 S.m−1 at 1.5 T, 0.39‐0.58 S.m−1 at 3 T, and 0.34‐0.42 S.m−1 (16‐19 mM KH2PO4(aq)) at 7 T. The mean γ‐ATP concentration quantified in vivo at 7 T was 1.39 ± 0.30 mmol.L−1 to 1.71 ± 0.35 mmol.L−1 wet tissue for the 10‐cm loop and 1.88 ± 0.25 mmol.L−1 wet tissue for the array. Conclusion It is essential to select a calibration phantom with appropriate conductivity for quantitative phosphorus spectroscopy at 7 T. Using an 18‐mM phosphate phantom and simplified normalization, human liver phosphate metabolite concentrations were successfully quantified at 7 T.
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Affiliation(s)
- Lucian A B Purvis
- Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
| | - Ladislav Valkovič
- Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom.,Department of Imaging Methods, Institute of Measurement Science, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Matthew D Robson
- Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
| | - Christopher T Rodgers
- Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom.,Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, United Kingdom
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Zavitsas AA. Quest To Demystify Water: Ideal Solution Behaviors Are Obtained by Adhering to the Equilibrium Mass Action Law. J Phys Chem B 2019; 123:869-883. [DOI: 10.1021/acs.jpcb.8b07166] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Andreas A. Zavitsas
- Department of Chemistry and Biochemistry, Long Island University, 1 University Plaza, Brooklyn, New York 11201, United States
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23
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Mukherjee K, Schwaab G, Havenith M. Cation-specific interactions of protein surface charges in dilute aqueous salt solutions: a combined study using dielectric relaxation spectroscopy and Raman spectroscopy. Phys Chem Chem Phys 2018; 20:29306-29313. [PMID: 30444249 DOI: 10.1039/c8cp05011b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We exploited glycine as a zwitterionic model system to experimentally probe the cation specific interaction of protein surface charges in dilute (≤0.25 mol L-1) aqueous solutions of four biologically relevant inorganic salts, NaCl, KCl, MgCl2 and CaCl2, via dielectric relaxation spectroscopy (DRS) and Raman spectroscopy. Glycine is the simplest building block of proteins and it exposes the same charged groups (carboxylate and ammonium) to the solvent that dominate the protein-water interface. As a counter ion, we selected Cl- due to its biological importance. For all systems, we performed simultaneous fitting of the real (ε') and imaginary (ε″) parts of the dielectric functions, assuming a multimodal relaxation model, obtained from concentration dependent dielectric measurements at ∼293 K. We observe a reduction of the dielectric amplitude for the glycine relaxation while the corresponding time constant shows only small (<7%) deviations compared to aqueous glycine solutions. We propose that the observed reduction in dielectric amplitude is due to a reduction of the effective dipole moment (µeff) of zwitterionic glycine caused by the interaction of glycine with the ion even at very low (0.05 M) salt concentrations. The interaction between divalent metal ions and zwitterionic glycine is increased compared to the monovalent cation-zwitterion interaction; a finding that is also supported by Raman spectroscopy. Our combined dielectric relaxation and Raman spectroscopic study indicates that ion-glycine interactions are weak and mediated by the solvent. Cation-specificity of protein surface charges is also observed in dilute salt solutions (≤0.25 mol L-1), where electrostatic interactions dominate.
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Affiliation(s)
- K Mukherjee
- Ruhr University Bochum, Faculty of Chemistry and Biochemistry, Physical Chemistry 2, Germany.
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Eldamak AR, Fear EC. Conformal and Disposable Antenna-Based Sensor for Non-Invasive Sweat Monitoring. SENSORS 2018; 18:s18124088. [PMID: 30469510 PMCID: PMC6308724 DOI: 10.3390/s18124088] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 11/17/2018] [Accepted: 11/20/2018] [Indexed: 11/16/2022]
Abstract
This paper presents a feasibility study for a non-wearable, conformal, low cost, and disposable antenna-based sensor for non-invasive hydration monitoring using sweat. It is composed of a patch antenna implemented on a cellulose filter paper substrate and operating in the range 2–4 GHz. The paper substrate can absorb liquids, such as sweat on the skin, through two slots incorporated within the antenna structure. Thus, the substrate dielectric properties are altered according to the properties of the absorbed liquid. Changes in reflection-based measurements are used to analyze salt solutions and artificial sweat, specifically the amount of sampled solution and the sodium chloride (NaCl) concentration. Using the shift in resonant frequency and magnitude of the reflection coefficient, NaCl concentrations in the range of 8.5–200 mmol/L, representing different hydration states, are detected. The measurements demonstrate the feasibility of using microwave based measurements for hydration monitoring using sweat.
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Affiliation(s)
- Angie R Eldamak
- Department of Electronics and Electrical Communication Engineering, Faculty of Engineering, Ain Shams University, Cairo 11517, Egypt.
- Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
| | - Elise C Fear
- Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
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25
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Yanase K, Obikane M, Ogura T, Buchner R, Igarashi A, Sato T. Ion fluctuations and intermembrane interactions in the aqueous dispersions of a dialkylchain cationic surfactant studied using dielectric relaxation spectroscopy and small- and wide-angle X-ray scattering. Phys Chem Chem Phys 2018; 20:26621-26633. [PMID: 30318537 DOI: 10.1039/c8cp05575k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A dialkylchain cationic surfactant forms the so-called α-gel in water showing virtually no fluidity, which is transformed into a highly fluidic dispersion upon addition of a small amount of salt. This intriguing phenomenon is utilized in household industries. However, the underlying mechanisms remain unclear. Here, we use dielectric relaxation spectroscopy (DRS) and simultaneous small- and wide-angle X-ray scattering (SWAXS) to shed light on this issue. We find that an excess amount of CaCl2 induces an α-gel-to-multi-lamellar vesicle (MLV) transition accompanied by a marked increase of the reservoir volume fraction. This resembles an unbound lamellar-to-bound lamellar transition that cannot be explained without invoking a weak long-ranged electrostatic attraction. The DRS data provide evidence that the counterions fluctuate both vertically and laterally at the interface, whose relaxation amplitudes sharply depend on a percolating state of an aqueous phase. The strikingly small bulk-water amplitude is likely to reflect depolarizing electric fields induced by the MLV architecture, along with genuine hydration effects. The modified Caillé approach to the SAXS intensities reveals sensitive salt-concentration dependent membrane-membrane interactions. The least undulating membranes are formed at a salt concentration of ca. 10 mmol L-1. Above 25 mmol L-1, where small surface separation (<2.5 nm) is attained, far more undulating membranes than those predicted by the Helfrich interaction are produced. This suggests that the hydration forces, generally believed to induce strong short-range repulsion, do not suppress the membrane undulation fluctuations.
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Affiliation(s)
- Keiichi Yanase
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano 386-8567, Japan.
| | - Miku Obikane
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano 386-8567, Japan.
| | - Taku Ogura
- Research & Development Headquarters, LION Corporation, Tokyo 132-0035, Japan.
| | - Richard Buchner
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040, Regensburg, Germany
| | - Akinori Igarashi
- Research & Development Headquarters, LION Corporation, Tokyo 132-0035, Japan.
| | - Takaaki Sato
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano 386-8567, Japan.
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Zhang Q, Pan Z, Zhang L, Zhang R, Chen Z, Jin T, Wu T, Chen X, Zhuang W. Ion effect on the dynamics of water hydrogen bonding network: A theoretical and computational spectroscopy point of view. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2018. [DOI: 10.1002/wcms.1373] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Qiang Zhang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
- Department of ChemistryBohai UniversityJinzhouChina
| | - Zhijun Pan
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
| | - Lu Zhang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
| | - Ruiting Zhang
- School of Physics and Optoelectronic EngineeringXidian UniversityXi'anChina
| | - Zhening Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
| | - Tan Jin
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
| | - Tianmin Wu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
| | - Xian Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
| | - Wei Zhuang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouChina
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27
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Cota R, Ottosson N, Bakker HJ, Woutersen S. Evidence for Reduced Hydrogen-Bond Cooperativity in Ionic Solvation Shells from Isotope-Dependent Dielectric Relaxation. PHYSICAL REVIEW LETTERS 2018; 120:216001. [PMID: 29883173 DOI: 10.1103/physrevlett.120.216001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 01/08/2018] [Indexed: 06/08/2023]
Abstract
We find that the reduction in dielectric response (depolarization) of water caused by solvated ions is different for H_{2}O and D_{2}O. This isotope dependence allows us to reliably determine the kinetic contribution to the depolarization, which is found to be significantly smaller than predicted by existing theory. The discrepancy can be explained from a reduced hydrogen-bond cooperativity in the solvation shell: we obtain quantitative agreement between theory and experiment by reducing the Kirkwood correlation factor of the solvating water from 2.7 (the bulk value) to ∼1.6 for NaCl and ∼1 (corresponding to completely uncorrelated motion of water molecules) for CsCl.
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Affiliation(s)
- Roberto Cota
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | | | - Huib J Bakker
- AMOLF, Science Park 104, 1098 XG Amsterdam, Netherlands
| | - Sander Woutersen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
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Huang B, Muy S, Feng S, Katayama Y, Lu YC, Chen G, Shao-Horn Y. Non-covalent interactions in electrochemical reactions and implications in clean energy applications. Phys Chem Chem Phys 2018; 20:15680-15686. [DOI: 10.1039/c8cp02512f] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tuning redox solvation shell disordering was suggested to control reaction entropy change and redox kinetics in thermal electrochemical conversion.
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Affiliation(s)
- Botao Huang
- Electrochemical Energy Laboratory
- Massachusetts Institute of Technology
- Cambridge
- USA
- Research Laboratory of Electronics
| | - Sokseiha Muy
- Electrochemical Energy Laboratory
- Massachusetts Institute of Technology
- Cambridge
- USA
- Department of Material Science and Engineering
| | - Shuting Feng
- Electrochemical Energy Laboratory
- Massachusetts Institute of Technology
- Cambridge
- USA
- Department of Chemical Engineering
| | - Yu Katayama
- Electrochemical Energy Laboratory
- Massachusetts Institute of Technology
- Cambridge
- USA
- Department of Applied Chemistry
| | - Yi-Chun Lu
- Electrochemical Energy and Interfaces Laboratory
- Department of Mechanical and Automation Engineering
- The Chinese University of Hong Kong
- Shatin
- China
| | - Gang Chen
- Department of Mechanical Engineering
- Massachusetts Institute of Technology
- Cambridge
- USA
| | - Yang Shao-Horn
- Electrochemical Energy Laboratory
- Massachusetts Institute of Technology
- Cambridge
- USA
- Research Laboratory of Electronics
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29
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Odinaev S, Makhmadbegov RS. Calculating Permittivity and Dielectric Loss Frequency Spectra for Aqueous Electrolyte Solutions. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2018. [DOI: 10.1134/s0036024417120226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Ren G, Chen L, Wang Y. Dynamic heterogeneity in aqueous ionic solutions. Phys Chem Chem Phys 2018; 20:21313-21324. [DOI: 10.1039/c8cp02787k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
It is well known that supercooled liquids have heterogeneous dynamics, but it is still unclear whether dynamic heterogeneity also exists in aqueous ionic solutions at room or even higher temperatures.
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Affiliation(s)
- Gan Ren
- Department of Physics
- Civil Aviation Flight University of China
- Guanghan
- China
| | - Lin Chen
- State Key Laboratory of Environment-Friendly Energy Material
- Southwest University of Science and Technology
- Mianyang
- China
| | - Yanting Wang
- CAS Key Laboratory of Theoretical Physics
- Institute of Theoretical Physics
- Chinese Academy of Sciences
- Beijing
- China
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31
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Lima LF, Vieira AL, Mukai H, Andrade CM, Fernandes PR. Electric impedance of aqueous KCl and NaCl solutions: Salt concentration dependence on components of the equivalent electric circuit. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.069] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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32
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Das Mahanta D, Samanta N, Mitra RK. Decisive Role of Hydrophobicity on the Effect of Alkylammonium Chlorides on Protein Stability: A Terahertz Spectroscopic Finding. J Phys Chem B 2017; 121:7777-7785. [DOI: 10.1021/acs.jpcb.7b04088] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debasish Das Mahanta
- Chemical, Biological and
Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences Block-JD, Sector-III, Salt Lake, Kolkata, 700106, India
| | - Nirnay Samanta
- Chemical, Biological and
Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences Block-JD, Sector-III, Salt Lake, Kolkata, 700106, India
| | - Rajib Kumar Mitra
- Chemical, Biological and
Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences Block-JD, Sector-III, Salt Lake, Kolkata, 700106, India
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33
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Non-thermal effects of microwave in sodium chloride aqueous solution: Insights from molecular dynamics simulations. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.126] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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34
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Das S, Biswas R, Mukherjee B. Collective dynamic dipole moment and orientation fluctuations, cooperative hydrogen bond relaxations, and their connections to dielectric relaxation in ionic acetamide deep eutectics: Microscopic insight from simulations. J Chem Phys 2017; 145:084504. [PMID: 27586932 DOI: 10.1063/1.4961586] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The paper reports a detailed simulation study on collective reorientational relaxation, cooperative hydrogen bond (H-bond) fluctuations, and their connections to dielectric relaxation (DR) in deep eutectic solvents made of acetamide and three uni-univalent electrolytes, lithium nitrate (LiNO3), lithium bromide (LiBr), and lithium perchlorate (LiClO4). Because cooperative H-bond fluctuations and ion migration complicate the straightforward interpretation of measured DR timescales in terms of molecular dipolar rotations for these conducting media which support extensive intra- and inter-species H-bonding, one needs to separate out the individual components from the overall relaxation for examining the microscopic origin of various timescales. The present study does so and finds that reorientation of ion-complexed acetamide molecules generates relaxation timescales that are in sub-nanosecond to nanosecond range. This explains in molecular terms the nanosecond timescales reported by recent giga-Hertz DR measurements. Interestingly, the simulated survival timescale for the acetamide-Li(+) complex has been found to be a few tens of nanosecond, suggesting such a cation-complexed species may be responsible for a similar timescale reported by mega-Hertz DR measurements of acetamide/potassium thiocyanate deep eutectics near room temperature. The issue of collective versus single particle relaxation is discussed, and jump waiting time distributions are determined. Dependence on anion-identity in each of the cases has been examined. In short, the present study demonstrates that assumption of nano-sized domain formation is not required for explaining the DR detected nanosecond and longer timescales in these media.
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Affiliation(s)
- Suman Das
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700098, India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700098, India
| | - Biswaroop Mukherjee
- Thematic Unit for Excellence - Computational Materials Science, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700098, India
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35
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Balos V, Bonn M, Hunger J. Quantifying transient interactions between amide groups and the guanidinium cation. Phys Chem Chem Phys 2016; 17:28539-43. [PMID: 26461077 DOI: 10.1039/c5cp04619j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We study the interaction of the guanidinium cation, a widely used protein denaturant, with amide groups, the common structural motif of proteins. Our results provide evidence for direct contact between guanidinium and ∼2 amide groups, but the interaction is transient and weaker than for other cations with high charge-density.
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Affiliation(s)
- V Balos
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - M Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - J Hunger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
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36
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37
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Balos V, Kim H, Bonn M, Hunger J. Hofmeister-Effekte unter der Lupe: Die direkte Anion-Amid-Bindung ist schwächer als die Kation-Amid-Bindung. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602769] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Vasileios Balos
- Abteilung für molekulare Spektroskopie; Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Heejae Kim
- Abteilung für molekulare Spektroskopie; Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Mischa Bonn
- Abteilung für molekulare Spektroskopie; Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
| | - Johannes Hunger
- Abteilung für molekulare Spektroskopie; Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Deutschland
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38
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Balos V, Kim H, Bonn M, Hunger J. Dissecting Hofmeister Effects: Direct Anion-Amide Interactions Are Weaker than Cation-Amide Binding. Angew Chem Int Ed Engl 2016; 55:8125-8. [DOI: 10.1002/anie.201602769] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Vasileios Balos
- Department for Molecular Spectroscopy; Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Heejae Kim
- Department for Molecular Spectroscopy; Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Mischa Bonn
- Department for Molecular Spectroscopy; Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Johannes Hunger
- Department for Molecular Spectroscopy; Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
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39
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40
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Zavitsas AA. Comment on “The size and structure of selected hydrated ions and implications for ion channel selectivity” by Z.-H. Yang, RSC. Adv., 2015, 5, 1213. RSC Adv 2016. [DOI: 10.1039/c6ra13733d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hydration numbers of electrolytes from freezing point depressions plottedversusthe entropic contributions for the gaseous cations dissolving in water.
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41
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Shilov IY, Lyashchenko AK. The Role of Concentration Dependent Static Permittivity of Electrolyte Solutions in the Debye–Hückel Theory. J Phys Chem B 2015; 119:10087-95. [DOI: 10.1021/acs.jpcb.5b04555] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ignat Yu. Shilov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Andrey K. Lyashchenko
- Kurnakov
Institute of General
and Inorganic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia
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42
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Mukherjee K, Das A, Choudhury S, Barman A, Biswas R. Dielectric Relaxations of (Acetamide + Electrolyte) Deep Eutectic Solvents in the Frequency Window, 0.2 ≤ ν/GHz ≤ 50: Anion and Cation Dependence. J Phys Chem B 2015; 119:8063-71. [DOI: 10.1021/acs.jpcb.5b01502] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kallol Mukherjee
- Chemical, Biological
and Macromolecular Sciences (CBMS), and ‡Condensed Matter
Physics and Material Sciences (CMPMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
| | - Anuradha Das
- Chemical, Biological
and Macromolecular Sciences (CBMS), and ‡Condensed Matter
Physics and Material Sciences (CMPMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
| | - Samiran Choudhury
- Chemical, Biological
and Macromolecular Sciences (CBMS), and ‡Condensed Matter
Physics and Material Sciences (CMPMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
| | - Anjan Barman
- Chemical, Biological
and Macromolecular Sciences (CBMS), and ‡Condensed Matter
Physics and Material Sciences (CMPMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
| | - Ranjit Biswas
- Chemical, Biological
and Macromolecular Sciences (CBMS), and ‡Condensed Matter
Physics and Material Sciences (CMPMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700098, India
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43
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Eiberweiser A, Nazet A, Hefter G, Buchner R. Ion hydration and association in aqueous potassium phosphate solutions. J Phys Chem B 2015; 119:5270-81. [PMID: 25826464 DOI: 10.1021/acs.jpcb.5b01417] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ionic hydration and ion association in aqueous solutions of KH2PO4, K2HPO4, and K3PO4 at 25 °C up to high concentrations have been investigated using dielectric relaxation spectroscopy (DRS). The three phosphate anions were found to be extensively hydrated, with total hydration numbers at infinite dilution of ~11 (for H2PO4(-)), ~20 (HPO4(2-)), and ~39 (PO4(3-)). These values are indicative of the existence of a second hydration shell around HPO4(2-) and especially PO4(3-). Two types of hydrating water molecules could be quantified: irrotationally bound (ib, H2O molecules essentially "frozen" on the DRS time scale) and "slow" (loosely bound water molecules with identifiably slower dynamics than bulk water). For H2PO4(-) over the entire concentration range and for HPO4(2-) and PO4(3-) at concentrations c ≲ 1 mol L(-1), only "slow" H2O was detected; however, at higher concentrations of the latter two anions, an increasing fraction of ib water appears, making up ~50% of the total hydration number close to the saturation limit of K2HPO4. Contrary to common belief, all three salts showed significant ion pair formation, with standard association constants of the 1:1 species increasing in the order: KH2PO4(0)(aq) < KHPO4(-)(aq) < KPO4(2-)(aq). The main type of ion pair in solution shifted from solvent-shared ion pairs (SIPs) to double-solvent-separated ion pairs (2SIPs) in the same sequence.
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Affiliation(s)
- Andreas Eiberweiser
- †Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, D-93040 Regensburg, Germany
| | - Andreas Nazet
- †Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, D-93040 Regensburg, Germany
| | - Glenn Hefter
- ‡Chemistry Department, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - Richard Buchner
- †Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, D-93040 Regensburg, Germany
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44
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Liu F, Wang F, Jia G, Huang K. Molecular dynamics simulation of the cooperative effect by different force fields in monosodium glutamate aqueous solution. RSC Adv 2015. [DOI: 10.1039/c4ra11328d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Different force fields (GROMOS and OPLS) in conjunction with different water (SPC, SPCE, TIP3P, TIP4P and TIP5P) were assessed using molecular dynamics simulations of monosodium glutamate (MSG) aqueous solution.
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Affiliation(s)
- Fenghai Liu
- Sichuan University
- College of Electronic and Information Engineering
- Cheng Du
- China
| | - Feng Wang
- Sichuan Normal University
- College of Physics and Electronic Engineering
- Cheng Du
- China
| | - Guozhu Jia
- Sichuan Normal University
- College of Physics and Electronic Engineering
- Cheng Du
- China
| | - Kama Huang
- Sichuan University
- College of Electronic and Information Engineering
- Cheng Du
- China
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45
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Brandes E, Stage C, Motschmann H, Rieder J, Buchner R. Is surface layering of aqueous alkali halides determined by ion pairing in the bulk solution? J Chem Phys 2014; 141:18C509. [DOI: 10.1063/1.4895969] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Feldman Y, Puzenko A, Ben Ishai P, Gutina Greenbaum A. The dielectric response of interfacial water—from the ordered structures to the single hydrated shell. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3296-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Gujt J, Bešter-Rogač M, Hribar-Lee B. An Investigation of Ion-Pairing of Alkali Metal Halides in Aqueous Solutions Using the Electrical Conductivity and the Monte Carlo Computer Simulation Methods. J Mol Liq 2014; 190:34-41. [PMID: 24526801 DOI: 10.1016/j.molliq.2013.09.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The ion pairing is, in very dilute aqueous solutions, of rather small importance for solutions' properties, which renders its precise quantification quite a laborious task. Here we studied the ion pairing of alkali halides in water by using the precise electric conductivity measurements in dilute solutions, and in a wide temperature range. The low-concentration chemical model was used to analyze the results, and to estimate the association constant of different alkali halide salts. It has been shown that the association constant is related to the solubility of salts in water and produces a 'volcano relationship', when plotted against the difference between the free energy of hydration of the corresponding individual ions. The computer simulation, using the simple MB+dipole water model, were used to interprete the results, to find a microscopic basis for Collins' law of matching water affinities.
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Affiliation(s)
- Jure Gujt
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, SI-1000 Ljubljana, Slovenia
| | - Marija Bešter-Rogač
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, SI-1000 Ljubljana, Slovenia
| | - Barbara Hribar-Lee
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, SI-1000 Ljubljana, Slovenia
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48
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Shagieva FM, Boinovich LB. Manifestation of ion specificity in the behavior of the dynamic dielectric permittivity of aqueous solutions of alkali metal halides. J STRUCT CHEM+ 2014. [DOI: 10.1134/s0022476613080143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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49
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Kondoh M, Ohshima Y, Tsubouchi M. Ion effects on the structure of water studied by terahertz time-domain spectroscopy. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2013.11.055] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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50
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Ben Ishai P, Mamontov E, Nickels JD, Sokolov AP. Influence of Ions on Water Diffusion—A Neutron Scattering Study. J Phys Chem B 2013; 117:7724-8. [DOI: 10.1021/jp4030415] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul Ben Ishai
- Department of Applied Physics, The Hebrew University of Jerusalem, Givat Ram, Jerusalem
91904, Israel
- Joint Institute for Neutron Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee
37831, United States
- Department
of Chemistry, University of Tennessee,
Knoxville, Tennessee 37996,
United States
| | - Eugene Mamontov
- Chemical
and Engineering Materials
Division, MS 6473, P.O. Box 2008, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jonathan D. Nickels
- Joint Institute for Neutron Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee
37831, United States
- Department
of Chemistry, University of Tennessee,
Knoxville, Tennessee 37996,
United States
| | - Alexei P. Sokolov
- Joint Institute for Neutron Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee
37831, United States
- Department
of Chemistry, University of Tennessee,
Knoxville, Tennessee 37996,
United States
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