1
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Sharma A, Leverant CJ, Richards D, Beamis CP, Spoerke ED, Percival SJ, Rempe SB, Vanegas JM. Transport and Energetics of Carbon Dioxide in Ionic Liquids at Aqueous Interfaces. J Phys Chem B 2023. [PMID: 38048268 DOI: 10.1021/acs.jpcb.3c05946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
A major hurdle in utilizing carbon dioxide (CO2) lies in separating it from industrial flue gas mixtures and finding suitable storage methods that enable its application in various industries. To address this issue, we utilized a combination of molecular dynamics simulations and experiments to investigate the behavior of CO2 in common room-temperature ionic liquids (RTIL) when in contact with aqueous interfaces. Our investigation of RTILs, [EMIM][TFSI] and [OMIM][TFSI], and their interaction with a pure water layer mimics the environment of a previously developed ultrathin enzymatic liquid membrane for CO2 separation. We analyzed diffusion constants and viscosity, which reveals that CO2 molecules exhibit faster mobility within the selected ILs compared to what would be predicted solely based on the viscosity of the liquids using the standard Einstein-Stokes relation. Moreover, we calculated the free energy of translocation for various species across the aqueous-IL interface, including CO2 and HCO3-. Free energy profiles demonstrate that CO2 exhibits a more favorable partitioning behavior in the RTILs compared to that in pure water, while a significant barrier hinders the movement of HCO3- from the aqueous layer. Experimental measurement of the CO2 transport in the RTILs corroborates the model. These findings strongly suggest that hydrophobic RTILs could serve as a promising option for selectively transporting CO2 from aqueous media and concentrating it as a preliminary step toward storage.
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Affiliation(s)
- Arjun Sharma
- Department of Physics, University of Vermont, Burlington, Vermont 05405, United States
| | - Calen J Leverant
- Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Danielle Richards
- Electronic, Optical, and Nano Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | | | - Erik D Spoerke
- Electronic, Optical, and Nano Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Stephen J Percival
- Electronic, Optical, and Nano Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Susan B Rempe
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Juan M Vanegas
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331, United States
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2
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Sharma A, Chiang RA, Manginell M, Nardi I, Coker EN, Vanegas JM, Rempe SB, Bachand GD. Carbonic Anhydrase Robustness for Use in Nanoscale CO 2 Capture Technologies. ACS OMEGA 2023; 8:37830-37841. [PMID: 37867662 PMCID: PMC10586288 DOI: 10.1021/acsomega.3c02630] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 09/08/2023] [Indexed: 10/24/2023]
Abstract
Continued dependence on crude oil and natural gas resources for fossil fuels has caused global atmospheric carbon dioxide (CO2) emissions to increase to record-setting proportions. There is an urgent need for efficient and inexpensive carbon sequestration systems to mitigate large-scale emissions of CO2 from industrial flue gas. Carbonic anhydrase (CA) has shown high potential for enhanced CO2 capture applications compared to conventional absorption-based methods currently utilized in various industrial settings. This study aims to understand structural aspects that contribute to the stability of CA enzymes critical for their applications in industrial processes, which require the ability to withstand conditions different from those in their native environments. Here, we evaluated the thermostability and enzyme activity of mesophilic and thermophilic CA variants at different temperature conditions and in the presence of atmospheric gas pollutants like nitrogen oxides and sulfur oxides. Based on our enzyme activity assays and molecular dynamics simulations, we see increased conformational stability and CA activity levels in thermostable CA variants incubated week-long at different temperature conditions. The thermostable CA variants also retained high levels of CA activity despite changes in solution pH due to increasing NO and SO2 concentrations. A loss of CA activity was observed only at high concentrations of NO/SO2 that possibly can be minimized with the appropriate buffered solutions.
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Affiliation(s)
- Arjun Sharma
- Department
of Physics, The University of Vermont, Burlington, Vermont 05405-0160, United
States
| | - Rong-an Chiang
- Memzyme,
LLC, Albuquerque, New Mexico 87123, United States
| | - Monica Manginell
- Center
for Integrated Nanotechnologies, Sandia
National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Isaac Nardi
- Epigentor
Consultants, Inc., Miami, Florida 87185, United States
| | - Eric N. Coker
- Electronic,
Optical, and Nanomaterials Department, Sandia
National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Juan M. Vanegas
- Department
of Physics, The University of Vermont, Burlington, Vermont 05405-0160, United
States
| | - Susan B. Rempe
- Center
for Integrated Nanotechnologies, Sandia
National Laboratories, Albuquerque, New Mexico 87185, United States
| | - George D. Bachand
- Center
for Integrated Nanotechnologies, Sandia
National Laboratories, Albuquerque, New Mexico 87185, United States
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3
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Ho TA, Wang Y, Rempe SB, Dasgupta N, Johnston CT, Xu G, Zwier TS, Mills M. Control of the Structural Charge Distribution and Hydration State upon Intercalation of CO 2 into Expansive Clay Interlayers. J Phys Chem Lett 2023; 14:2901-2909. [PMID: 36926904 DOI: 10.1021/acs.jpclett.3c00291] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Numerous experimental investigations indicated that expansive clays such as montmorillonite can intercalate CO2 preferentially into their interlayers and therefore potentially act as a material for CO2 separation, capture, and storage. However, an understanding of the energy-structure relationship during the intercalation of CO2 into clay interlayers remains elusive. Here, we use metadynamics molecular dynamics simulations to elucidate the energy landscape associated with CO2 intercalation. Our free energy calculations indicate that CO2 favorably partitions into nanoconfined water in clay interlayers from a gas phase, leading to an increase in the CO2/H2O ratio in clay interlayers as compared to that in bulk water. CO2 molecules prefer to be located at the centers of charge-neutral hydrophobic siloxane rings, whereas interlayer spaces close to structural charges tend to avoid CO2 intercalation. The structural charge distribution significantly affects the amount of CO2 intercalated in the interlayers. These results provide a mechanistic understanding of CO2 intercalation in clays for CO2 separation, capture, and storage.
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Affiliation(s)
- Tuan A Ho
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Yifeng Wang
- Nuclear Waste Disposal Research and Analysis Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Susan B Rempe
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Nabankur Dasgupta
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Cliff T Johnston
- Department of Agronomy and Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, Indiana 47907, United States
| | - Guangping Xu
- Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Timothy S Zwier
- Gas Phase Chemical Physics Department, Sandia National Laboratories, Livermore, California 94550, United States
| | - Melissa Mills
- Nuclear Waste Disposal Research and Analysis Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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4
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Li J, Guo J, Dai H. Probing dissolved CO 2(aq) in aqueous solutions for CO 2 electroreduction and storage. SCIENCE ADVANCES 2022; 8:eabo0399. [PMID: 35559679 PMCID: PMC9106293 DOI: 10.1126/sciadv.abo0399] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 03/31/2022] [Indexed: 05/31/2023]
Abstract
CO2 dissolved in aqueous solutions CO2(aq) is important to CO2 capture, storage, photo-/electroreduction in the fight against global warming and to CO2 analysis in drinks. Here, we developed microscale infrared (IR) spectroscopy for in situ dynamic quantitating CO2(aq). The quantized CO2(g) rotational state transitions were observed to quench for CO2(aq), accompanied by increased H2O IR absorption. An accurate CO2 molar extinction coefficient ε was derived for in situ CO2(aq) quantification up to 58 atm. We directly measured CO2(aq) concentrations in electrolytes under CO2(g) bubbling and high-pressure conditions with high spectral and time resolutions. In KHCO3 electrolytes with CO2(aq) > ~1 M, CO2 electroreduction (CO2RR) to formate reached >98% Faradaic efficiencies on copper (Cu2O/Cu)-based electrocatalyst. Furthermore, CO2 dissolution/desolvation kinetics showed large hysteresis and ultraslow reversal of CO2(aq) supersaturation in aqueous systems, with implications to CO2 capture, storage, and supersaturation phenomena in natural water bodies.
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Affiliation(s)
- Jiachen Li
- Department of Chemistry and Bio-X, Stanford University, Stanford, CA 94305, USA
- Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
| | - Jinyu Guo
- Department of Chemistry and Bio-X, Stanford University, Stanford, CA 94305, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Hongjie Dai
- Department of Chemistry and Bio-X, Stanford University, Stanford, CA 94305, USA
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5
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Gleim J, Lindner J, Voehringer P. Vibrational Relaxation of Carbon Dioxide in Water. J Chem Phys 2022; 156:094505. [DOI: 10.1063/5.0082358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jeannine Gleim
- Rheinische Friedrich-Wilhelms-Universität Bonn Institut für Physikalische und Theoretische Chemie, Germany
| | - Jörg Lindner
- Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn Institut für Physikalische und Theoretische Chemie, Germany
| | - Peter Voehringer
- Institut fuer Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn Institut für Physikalische und Theoretische Chemie, Germany
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6
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Serva A, Havenith M, Pezzotti S. The role of hydrophobic hydration in the free energy of chemical reactions at the gold/water interface: Size and position effects. J Chem Phys 2021; 155:204706. [PMID: 34852496 DOI: 10.1063/5.0069498] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Metal/water interfaces catalyze a large variety of chemical reactions, which often involve small hydrophobic molecules. In the present theoretical study, we show that hydrophobic hydration at the Au(100)/water interface actively contributes to the reaction free energy by up to several hundreds of meV. This occurs either in adsorption/desorption reaction steps, where the vertical distance from the surface changes in going from reactants to products, or in addition and elimination reaction steps, where two small reactants merge into a larger product and vice versa. We find that size and position effects cannot be captured by treating them as independent variables. Instead, their simultaneous evaluation allows us to map the important contributions, and we provide examples of their combinations for which interfacial reactions can be either favored or disfavored. By taking a N2 and a CO2 reduction pathway as test cases, we show that explicitly considering hydrophobic effects is important for the selectivity and rate of these relevant interfacial processes.
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Affiliation(s)
- Alessandra Serva
- Sorbonne Université, CNRS, Physico-Chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France
| | - Martina Havenith
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
| | - Simone Pezzotti
- Department of Physical Chemistry II, Ruhr University Bochum, 44780 Bochum, Germany
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7
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Maldonado AM, Basdogan Y, Berryman JT, Rempe SB, Keith JA. First-principles modeling of chemistry in mixed solvents: Where to go from here? J Chem Phys 2020; 152:130902. [PMID: 32268733 DOI: 10.1063/1.5143207] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Mixed solvents (i.e., binary or higher order mixtures of ionic or nonionic liquids) play crucial roles in chemical syntheses, separations, and electrochemical devices because they can be tuned for specific reactions and applications. Apart from fully explicit solvation treatments that can be difficult to parameterize or computationally expensive, there is currently no well-established first-principles regimen for reliably modeling atomic-scale chemistry in mixed solvent environments. We offer our perspective on how this process could be achieved in the near future as mixed solvent systems become more explored using theoretical and computational chemistry. We first outline what makes mixed solvent systems far more complex compared to single-component solvents. An overview of current and promising techniques for modeling mixed solvent environments is provided. We focus on so-called hybrid solvation treatments such as the conductor-like screening model for real solvents and the reference interaction site model, which are far less computationally demanding than explicit simulations. We also propose that cluster-continuum approaches rooted in physically rigorous quasi-chemical theory provide a robust, yet practical, route for studying chemical processes in mixed solvents.
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Affiliation(s)
- Alex M Maldonado
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
| | - Yasemin Basdogan
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
| | - Joshua T Berryman
- Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg City, Luxembourg
| | - Susan B Rempe
- Center for Computational Biology and Biophysics, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - John A Keith
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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8
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Yang F, Wang X, Liu Y, Yang Y, Zhao M, Liu X, Li W. Understanding CO2 capture kinetics and energetics by ionic liquids with molecular dynamics simulation. RSC Adv 2020; 10:13968-13974. [PMID: 35498469 PMCID: PMC9051916 DOI: 10.1039/d0ra02221g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 03/16/2020] [Indexed: 11/21/2022] Open
Abstract
The interactions between ionic liquids (ILs) and CO2 were studied by molecular dynamics simulations. Several key characters, including the volumes of cations and anions, the length of the alkyl chain have been assessed on CO2 capture capability.
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Affiliation(s)
- Fan Yang
- School of Physics and State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
| | - Xianjuan Wang
- School of Physics and State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
| | - Yang Liu
- School of Physics and State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
| | - Yanmei Yang
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
| | - Mingwen Zhao
- School of Physics and State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
| | - Xiangdong Liu
- School of Physics and State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
| | - Weifeng Li
- School of Physics and State Key Laboratory of Crystal Materials
- Shandong University
- Jinan
- China
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9
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Basdogan Y, Groenenboom MC, Henderson E, De S, Rempe SB, Keith JA. Machine Learning-Guided Approach for Studying Solvation Environments. J Chem Theory Comput 2019; 16:633-642. [PMID: 31809056 DOI: 10.1021/acs.jctc.9b00605] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Molecular-level understanding and characterization of solvation environments are often needed across chemistry, biology, and engineering. Toward practical modeling of local solvation effects of any solute in any solvent, we report a static and all-quantum mechanics-based cluster-continuum approach for calculating single-ion solvation free energies. This approach uses a global optimization procedure to identify low-energy molecular clusters with different numbers of explicit solvent molecules and then employs the smooth overlap for atomic positions learning kernel to quantify the similarity between different low-energy solute environments. From these data, we use sketch maps, a nonlinear dimensionality reduction algorithm, to obtain a two-dimensional visual representation of the similarity between solute environments in differently sized microsolvated clusters. After testing this approach on different ions having charges 2+, 1+, 1-, and 2-, we find that the solvation environment around each ion can be seen to usually become more similar in hand with its calculated single-ion solvation free energy. Without needing either dynamics simulations or an a priori knowledge of local solvation structure of the ions, this approach can be used to calculate solvation free energies within 5% of experimental measurements for most cases, and it should be transferable for the study of other systems where dynamics simulations are not easily carried out.
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Affiliation(s)
- Yasemin Basdogan
- Department of Chemical and Petroleum Engineering Swanson School of Engineering , University of Pittsburgh , Pittsburgh 15261 , Pennsylvania , United States
| | - Mitchell C Groenenboom
- Department of Chemical and Petroleum Engineering Swanson School of Engineering , University of Pittsburgh , Pittsburgh 15261 , Pennsylvania , United States
| | - Ethan Henderson
- Department of Chemical and Petroleum Engineering Swanson School of Engineering , University of Pittsburgh , Pittsburgh 15261 , Pennsylvania , United States
| | - Sandip De
- Laboratory of Computational Science and Modelling, Institute of Materials , École Polytechnique Fédérale de Lausanne , Lausanne 1015 , Switzerland
| | - Susan B Rempe
- Department of Nanobiology , Sandia National Laboratories , Albuquerque 87185 , New Mexico , United States
| | - John A Keith
- Department of Chemical and Petroleum Engineering Swanson School of Engineering , University of Pittsburgh , Pittsburgh 15261 , Pennsylvania , United States
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10
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Muralidharan A, Pratt L, Chaudhari M, Rempe S. Quasi-chemical theory for anion hydration and specific ion effects: Cl-(aq) vs. F-(aq). ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.cpletx.2019.100037] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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11
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Muralidharan A, Pratt LR, Chaudhari MI, Rempe SB. Quasi-Chemical Theory with Cluster Sampling from Ab Initio Molecular Dynamics: Fluoride (F -) Anion Hydration. J Phys Chem A 2018; 122:9806-9812. [PMID: 30475612 DOI: 10.1021/acs.jpca.8b08474] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Accurate predictions of the hydration free energy for anions typically has been more challenging than that for cations. Hydrogen bond donation to the anion in hydrated clusters such as F(H2O) n - can lead to delicate structures. Consequently, the energy landscape contains many local minima, even for small clusters, and these minima present a challenge for computational optimization. Utilization of cluster experimental results for the free energies of gas-phase clusters shows that even though anharmonic effects are interesting they need not be of troublesome magnitudes for careful applications of quasi-chemical theory to ion hydration. Energy-optimized cluster structures for anions can leave the central ion highly exposed, and application of implicit solvation models to these structures can incur more serious errors than those for metal cations. Utilizing cluster structures sampled from ab initio molecular dynamics simulations substantially fixes those issues.
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Affiliation(s)
- A Muralidharan
- Department of Chemical and Biomolecular Engineering , Tulane University , New Orleans , Louisiana 70118 , United States
| | - L R Pratt
- Department of Chemical and Biomolecular Engineering , Tulane University , New Orleans , Louisiana 70118 , United States
| | - M I Chaudhari
- Center for Biological and Engineering Sciences , Sandia National Laboratories , Albuquerque , New Mexico 87185 , United States
| | - S B Rempe
- Center for Biological and Engineering Sciences , Sandia National Laboratories , Albuquerque , New Mexico 87185 , United States
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12
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Prasetyo N, Hofer TS. Structure, Dynamics, and Hydration Free Energy of Carbon Dioxide in Aqueous Solution: A Quantum Mechanical/Molecular Mechanics Molecular Dynamics Thermodynamic Integration (QM/MM MD TI) Simulation Study. J Chem Theory Comput 2018; 14:6472-6483. [PMID: 30336013 DOI: 10.1021/acs.jctc.8b00557] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The solvation of carbon dioxide in solution represents a key step for the capture and fixation CO2 in nature, which may be further influenced by the formation of (bi)carbonate species and/or the formation of CO2 clusters in solution. The latter processes are strongly dependent on the exact environment of the liquid state (e.g., pH value, solvated ions, etc.) and may interfere with the experimental determination of structural, dynamical, and thermodynamic properties. In this work a hybrid quantum mechanical/molecular mechanical (QM/MM) simulation approach at correlated ab initio level of theory resolution-of-identity second-order Møller-Plesset Perturbation Theory (RI-MP2) has been applied in the framework of thermodynamic integration (TI) to study structure, dynamics, and the hydration free energy of a single carbon dioxide molecule in aqueous solution. A detailed analysis of the individual QM/MM potential energy contributions demonstrate that the overall potential remains highly consistent over the entire sampling phase and that no artificial contributions are influencing the determination of the hydration free energy. The latter value of 0.01 ± 0.92 kcal/mol was found in very good agreement with the values of 0.06 and 0.24 kcal/mol obtained via quasi-chemical theory and experimental measurements, respectively. In order to obtain detailed information about the C- and O C-water interaction, conically restricted regions with respect to the main axis of the CO2 molecule have been employed in structural analysis. The presented data not only provide detailed information about the hydration properties of CO2 but act as a critical validation of the simulation technique, which will be beneficial in the study of nonaqueous solvents such as pure and aqueous NH3 solutions, which have been suggested as potential candidates to capture CO2 from anthropogenic sources.
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Affiliation(s)
- Niko Prasetyo
- Theoretical Chemistry Division, Institute of General, Inorganic and Theoretical Chemistry , University of Innsbruck , Innrain 80-82A , A-6020 Innsbruck , Austria.,Austria-Indonesia Centre (AIC) for Computational Chemistry , Universitas Gadjah Mada , Sekip Utara, Yogyakarta 55281 , Indonesia.,Department of Chemistry, Faculty of Mathematics and Natural Sciences , Universitas Gadjah Mada , Sekip Utara, Yogyakarta 55281 , Indonesia
| | - Thomas S Hofer
- Theoretical Chemistry Division, Institute of General, Inorganic and Theoretical Chemistry , University of Innsbruck , Innrain 80-82A , A-6020 Innsbruck , Austria
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13
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Ho TA, Ilgen A. Density Fluctuation in Aqueous Solutions and Molecular Origin of Salting-Out Effect for CO 2. J Phys Chem B 2017; 121:11485-11491. [PMID: 29072910 DOI: 10.1021/acs.jpcb.7b09215] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using molecular dynamics simulation, we studied the density fluctuations and cavity formation probabilities in aqueous solutions and their effect on the hydration of CO2. With increasing salt concentration, we report an increased probability of observing a larger than the average number of species in the probe volume. Our energetic analyses indicate that the van der Waals and electrostatic interactions between CO2 and aqueous solutions become more favorable with increasing salt concentration, favoring the solubility of CO2 (salting in). However, due to the decreasing number of cavities forming when salt concentration is increased, the solubility of CO2 decreases. The formation of cavities was found to be the primary control on the dissolution of gas, and is responsible for the observed CO2 salting-out effect. Our results provide the fundamental understanding of the density fluctuation in aqueous solutions and the molecular origin of the salting-out effect for real gas.
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Affiliation(s)
- Tuan Anh Ho
- Geochemistry Department, Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
| | - Anastasia Ilgen
- Geochemistry Department, Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
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14
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Chaudhari MI, Pratt LR, Rempe SB. Utility of chemical computations in predicting solution free energies of metal ions. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1342127] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Mangesh I. Chaudhari
- Center for Biological and Engineering Sciences, Sandia National Laboratories, Albuquerque, NM, USA
| | - Lawrence R. Pratt
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA, USA
| | - Susan B. Rempe
- Center for Biological and Engineering Sciences, Sandia National Laboratories, Albuquerque, NM, USA
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15
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Chaudhari MI, Nair JR, Pratt LR, Soto FA, Balbuena PB, Rempe SB. Scaling Atomic Partial Charges of Carbonate Solvents for Lithium Ion Solvation and Diffusion. J Chem Theory Comput 2016; 12:5709-5718. [DOI: 10.1021/acs.jctc.6b00824] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mangesh I. Chaudhari
- Center
for Biological and Engineering Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jijeesh R. Nair
- Department
of Applied Science and Technology, Politecnico di Torino, Turin 10129, Italy
| | - Lawrence R. Pratt
- Department
of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, United States
| | - Fernando A. Soto
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Perla B. Balbuena
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Susan B. Rempe
- Center
for Biological and Engineering Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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16
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Pratt LR, Chaudhari MI, Rempe SB. Statistical Analyses of Hydrophobic Interactions: A Mini-Review. J Phys Chem B 2016; 120:6455-60. [PMID: 27258151 DOI: 10.1021/acs.jpcb.6b04082] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This review focuses on the striking recent progress in solving for hydrophobic interactions between small inert molecules. We discuss several new understandings. First, the inverse temperature phenomenology of hydrophobic interactions, i.e., strengthening of hydrophobic bonds with increasing temperature, is decisively exhibited by hydrophobic interactions between atomic-scale hard sphere solutes in water. Second, inclusion of attractive interactions associated with atomic-size hydrophobic reference cases leads to substantial, nontrivial corrections to reference results for purely repulsive solutes. Hydrophobic bonds are weakened by adding solute dispersion forces to treatment of reference cases. The classic statistical mechanical theory for those corrections is not accurate in this application, but molecular quasi-chemical theory shows promise. Finally, because of the masking roles of excluded volume and attractive interactions, comparisons that do not discriminate the different possibilities face an interpretive danger.
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Affiliation(s)
- Lawrence R Pratt
- Department of Chemical and Biomolecular Engineering, Tulane University , New Orleans, Louisiana 70118, United States
| | - Mangesh I Chaudhari
- Center for Biological and Engineering Sciences, Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
| | - Susan B Rempe
- Center for Biological and Engineering Sciences, Sandia National Laboratories , Albuquerque, New Mexico 87185, United States
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Soniat M, Rogers DM, Rempe SB. Dispersion- and Exchange-Corrected Density Functional Theory for Sodium Ion Hydration. J Chem Theory Comput 2016; 11:2958-67. [PMID: 26575733 DOI: 10.1021/acs.jctc.5b00357] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A challenge in density functional theory is developing functionals that simultaneously describe intermolecular electron correlation and electron delocalization. Recent exchange-correlation functionals address those two issues by adding corrections important at long ranges: an atom-centered pairwise dispersion term to account for correlation and a modified long-range component of the electron exchange term to correct for delocalization. Here we investigate how those corrections influence the accuracy of binding free energy predictions for sodium-water clusters. We find that the dual-corrected ωB97X-D functional gives cluster binding energies closest to high-level ab initio methods (CCSD(T)). Binding energy decomposition shows that the ωB97X-D functional predicts the smallest ion-water (pairwise) interaction energy and larger multibody contributions for a four-water cluster than most other functionals - a trend consistent with CCSD(T) results. Also, ωB97X-D produces the smallest amounts of charge transfer and the least polarizable waters of the density functionals studied, which mimics the lower polarizability of CCSD. When compared with experimental binding free energies, however, the exchange-corrected CAM-B3LYP functional performs best (error <1 kcal/mol), possibly because of its parametrization to experimental formation enthalpies. For clusters containing more than four waters, "split-shell" coordination must be considered to obtain accurate free energies in comparison with experiment.
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Affiliation(s)
- Marielle Soniat
- Department of Chemistry, University of New Orleans , 2000 Lakeshore Drive, New Orleans, Louisiana 70148, United States
| | - David M Rogers
- Center for Biological and Engineering Sciences, Sandia National Laboratories , Albuquerque, New Mexico 87123, United States.,Department of Chemistry, University of South Florida , Tampa, Florida 33620, United States
| | - Susan B Rempe
- Center for Biological and Engineering Sciences, Sandia National Laboratories , Albuquerque, New Mexico 87123, United States
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Abstract
The hydration structure of Ba(2+) ion is important for understanding blocking mechanisms in potassium ion channels. Here, we combine statistical mechanical theory, ab initio molecular dynamics simulations, and electronic structure methods to calculate the hydration free energy and local hydration structure of Ba(2+)(aq). The predicted hydration free energy (-304 ± 1 kcal/mol) agrees with the experimental value (-303 kcal/mol) when a maximally occupied, unimodal inner solvation shell is treated. In the local environment defined by the first shell of hydrating waters, Ba(2+) is directly and stably coordinated by eight (8) waters. Octa-coordination resembles the crystal structure of Ba(2+) and K(+) bound in potassium ion channels, but differs from the local hydration structure of K(+)(aq) determined earlier.
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Affiliation(s)
- Mangesh I Chaudhari
- †Center for Biological and Engineering Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Marielle Soniat
- ‡Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148, United States
| | - Susan B Rempe
- †Center for Biological and Engineering Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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Chaudhari MI, Sabo D, Pratt LR, Rempe SB. Hydration of Kr(aq) in Dilute and Concentrated Solutions. J Phys Chem B 2014; 119:9098-102. [DOI: 10.1021/jp508866h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Mangesh I. Chaudhari
- Center
for Biological and
Material Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Dubravko Sabo
- Department of Chemistry, New York University, New York, New York 10003, United States
| | - Lawrence R. Pratt
- Department of Chemical
and
Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, United States
| | - Susan B. Rempe
- Center for Biological and
Material Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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Ramírez-Solís A, Maron L. Aqueous microsolvation of CdCl₂: density functional theory and Born-Oppenheimer molecular dynamics studies. J Chem Phys 2014; 141:094304. [PMID: 25194369 DOI: 10.1063/1.4894286] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report a systematic study of aqueous microsolvation of CdCl2. The optimized structures and binding energies of the CdCl2-(H2O)n clusters with n = 1-24 have been computed at the B3PW91/6-31G** level. The solvation patterns obtained at the DFT level are verified at the MP2/AVTZ level for n < 6. Unlike HgCl2-(H2O)n case, where there are at most three Hg-O(w) orbital interactions, Cd also establishes four equatorial orbital interactions with water for n > 6 leading to a planar square bipyramid hexacoordination around Cd. The first solvation shell is fully attained with 12 water molecules. At the same level of theory the water binding energies are much larger than those previously found for HgCl2 due to the stronger Cd-O(w) interactions arising from the smaller core of Cd. For the largest system studied, CdCl2-(H2O)24, both penta- and hexa-coordination stable patterns around Cd are found. However, Born-Opphenheimer molecular dynamics simulations starting from these optimized geometries at 700 K reveal the greater stability of the Cd-pentacoordinated species, where a CdCl2-(H2O)3 trigonal bipyramid effective solute appears. The Cd-O(water) radial distribution function shows a bimodal distribution with two maxima at 2.4 Å and 4.2 Å, revealing the different coordination spheres, even with such a small number of solvating water molecules.
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Affiliation(s)
- A Ramírez-Solís
- Laboratoire de Physicochimie de Nano-Objets, INSA-IRSAMC, Université de Toulouse III, 135, Avenue de Rangueil, Toulouse, F31077, France
| | - L Maron
- Laboratoire de Physicochimie de Nano-Objets, INSA-IRSAMC, Université de Toulouse III, 135, Avenue de Rangueil, Toulouse, F31077, France
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21
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Sepehr F, Paddison SJ. The solvation structure and thermodynamics of aqueous vanadium cations. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.08.089] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Chen C, Zhang K, Wang P, Li WZ, Song YC, Zhang N. Ion hydration and hydrogen bond structure in NaCl solutions at temperatures and pressures for carbon dioxide sequestration: the effects of solvated CO2molecules. Mol Phys 2013. [DOI: 10.1080/00268976.2013.800244] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Shi Y, Beck TL. Length scales and interfacial potentials in ion hydration. J Chem Phys 2013; 139:044504. [DOI: 10.1063/1.4814070] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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Sabo D, Jiao D, Varma S, Pratt LR, Rempe SB. Case study of Rb+(aq), quasi-chemical theory of ion hydration, and the no split occupancies rule. ACTA ACUST UNITED AC 2013. [DOI: 10.1039/c3pc90009f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Riccardi D, Guo HB, Parks JM, Gu B, Liang L, Smith JC. Cluster-Continuum Calculations of Hydration Free Energies of Anions and Group 12 Divalent Cations. J Chem Theory Comput 2012; 9:555-69. [DOI: 10.1021/ct300296k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Demian Riccardi
- UT/ORNL Center for Molecular
Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak
Ridge, Tennessee 37831-6309, United States
- Department of Biochemistry and
Cellular and Molecular Biology, University of Tennessee, Knoxville,
Tennessee 37996, United States
| | - Hao-Bo Guo
- UT/ORNL Center for Molecular
Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak
Ridge, Tennessee 37831-6309, United States
| | - Jerry M. Parks
- UT/ORNL Center for Molecular
Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak
Ridge, Tennessee 37831-6309, United States
| | - Baohua Gu
- Environmental Science Division,
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United
States
| | - Liyuan Liang
- Environmental Science Division,
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United
States
| | - Jeremy C. Smith
- UT/ORNL Center for Molecular
Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak
Ridge, Tennessee 37831-6309, United States
- Department of Biochemistry and
Cellular and Molecular Biology, University of Tennessee, Knoxville,
Tennessee 37996, United States
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Jiao D, Rempe SB. Combined Density Functional Theory (DFT) and Continuum Calculations of pKa in Carbonic Anhydrase. Biochemistry 2012; 51:5979-89. [DOI: 10.1021/bi201771q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Dian Jiao
- Center for Biological and Materials Sciences, MS 0895, Sandia National Laboratories, Albuquerque, New Mexico
87185, United States
| | - Susan B. Rempe
- Center for Biological and Materials Sciences, MS 0895, Sandia National Laboratories, Albuquerque, New Mexico
87185, United States
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