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Vo P, Forsman J, Woodward CE. Boundary-Monte Carlo Method for Neutral and Charged Confined Fluids. J Chem Theory Comput 2022; 18:3766-3780. [PMID: 35575645 DOI: 10.1021/acs.jctc.1c01146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, we describe a new Monte Carlo (MC) simulation method to investigate highly coupled fluids in confined geometries at a constant chemical potential. This method is based on so-called multi-scale Hamiltonian methods, wherein the chemical potential is determined using a more amenable Hamiltonian for a fluid in an "outer" region, which facilitates standard methods, such as grand canonical MC simulations or Widom's particle insertion method. The (inner region) fluid of interest is placed in diffusive contact with the simpler outer fluid via a boundary zone wherein the Hamiltonian is transformed. The current method utilizes an ideal fluid for the outer regions, which allows for implicit rather than explicit simulations. Only the boundary and inner region need explicit consideration; hence, the nomenclature used is boundary-Monte Carlo. We illustrate the utility of the method for simple neutral and charged fluids in cylindrical and planar pores. In the latter case, we use a dense room-temperature ionic liquid model and illustrate how the boundary zone establishes a proper Donnan equilibrium between inner and outer fluids in the presence of charged planar electrodes. Thus, the method allows direct calculation of properties such as the differential capacitance, without the need for additional difficult calculations of the requisite Donnan potential.
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Affiliation(s)
- Phuong Vo
- School of Science, University of New South Wales, Canberra, Canberra ACT 2600, Australia
| | - Jan Forsman
- Department of Theoretical Chemistry, Chemical Centre, Lund University, Lund S-22100, Sweden
| | - Clifford E Woodward
- School of Science, University of New South Wales, Canberra, Canberra ACT 2600, Australia
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Yang D, Huang Y, Wang X, He R, Zhou G, Chen X, Yang Z. Different Hydrogen Bond Changes Driven by Surface Segregation Behavior of Imidazolium-Based Ionic Liquid Mixture at the Liquid-Vacuum Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11798-11808. [PMID: 32962350 DOI: 10.1021/acs.langmuir.0c01501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this work, molecular dynamics (MD) simulations were carried out to study the behaviors of a binary ionic liquid (IL) mixture consisting of equimolar [C2C1Im][BF4] and [C4C1Im][BF4], as well as two corresponding pure ILs, at the liquid-vacuum interface. Our simulation results show that the competition of nonpolar interactions between different alkyl chains of two cations results in an obvious surface segregation behavior of the IL mixture at the interface, indicating an enhanced aggregation of the [C4C1Im]+ cations but a weakened aggregation of the [C2C1Im]+ cations at the outermost surface. More interestingly, different hydrogen bond (HB) changes between two imidazolium cations at the interface can be driven by such surface segregation behavior, where the [C2C1Im]+ cations rather than the [C4C1Im]+ ones have more and stronger HBs with the [BF4]- anions by comparison with the corresponding pure ILs at the interface. Meanwhile, it is interesting to find that such a stronger HB would lower the rotations of the imidazolium rings of interfacial [C2C1Im]+ cations. By contrast, the [C4C1Im]+ cations at the outermost surface rotate faster owing to their weaker HB. In addition, the orientation analysis uncovers that there is a major decrease for the orderliness of interfacial [C2C1Im]+ cations, but a minor decrease for that of interfacial [C4C1Im]+ cations, from the pure IL to the IL mixture. Such distinct results are closely related to the surface segregation between the [C2C1Im]+ and [C4C1Im]+ cations in the IL mixture and their interfacial HB properties. Thus, our simulation results afford a deep insight into the surface segregation effect on the HB behavior of the imidazolium-based IL mixture at liquid-vacuum interface.
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Affiliation(s)
- Deshuai Yang
- Institute of Advanced Materials (IAM), State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Yiping Huang
- Institute of Advanced Materials (IAM), State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China
| | - Xueping Wang
- Institute of Advanced Materials (IAM), State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Ruiyao He
- Institute of Advanced Materials (IAM), State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Guobing Zhou
- Institute of Advanced Materials (IAM), State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Xiangshu Chen
- Institute of Advanced Materials (IAM), State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Zhen Yang
- Institute of Advanced Materials (IAM), State-Province Joint Engineering Laboratory of Zeolite Membrane Materials, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
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Wang YL, Li B, Sarman S, Mocci F, Lu ZY, Yuan J, Laaksonen A, Fayer MD. Microstructural and Dynamical Heterogeneities in Ionic Liquids. Chem Rev 2020; 120:5798-5877. [PMID: 32292036 PMCID: PMC7349628 DOI: 10.1021/acs.chemrev.9b00693] [Citation(s) in RCA: 192] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Indexed: 12/11/2022]
Abstract
Ionic liquids (ILs) are a special category of molten salts solely composed of ions with varied molecular symmetry and charge delocalization. The versatility in combining varied cation-anion moieties and in functionalizing ions with different atoms and molecular groups contributes to their peculiar interactions ranging from weak isotropic associations to strong, specific, and anisotropic forces. A delicate interplay among intra- and intermolecular interactions facilitates the formation of heterogeneous microstructures and liquid morphologies, which further contributes to their striking dynamical properties. Microstructural and dynamical heterogeneities of ILs lead to their multifaceted properties described by an inherent designer feature, which makes ILs important candidates for novel solvents, electrolytes, and functional materials in academia and industrial applications. Due to a massive number of combinations of ion pairs with ion species having distinct molecular structures and IL mixtures containing varied molecular solvents, a comprehensive understanding of their hierarchical structural and dynamical quantities is of great significance for a rational selection of ILs with appropriate properties and thereafter advancing their macroscopic functionalities in applications. In this review, we comprehensively trace recent advances in understanding delicate interplay of strong and weak interactions that underpin their complex phase behaviors with a particular emphasis on understanding heterogeneous microstructures and dynamics of ILs in bulk liquids, in mixtures with cosolvents, and in interfacial regions.
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Affiliation(s)
- Yong-Lei Wang
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Bin Li
- School
of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
| | - Sten Sarman
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Francesca Mocci
- Department
of Chemical and Geological Sciences, University
of Cagliari, I-09042 Monserrato, Italy
| | - Zhong-Yuan Lu
- State
Key Laboratory of Supramolecular Structure and Materials, Institute
of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China
| | - Jiayin Yuan
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Aatto Laaksonen
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
- State
Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China
- Centre of
Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry Aleea Grigore Ghica-Voda, 41A, 700487 Iasi, Romania
- Department
of Engineering Sciences and Mathematics, Division of Energy Science, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Michael D. Fayer
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
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Fatima U, Riyazuddeen, Montes-Campos H, Varela LM. Experimental and MD simulation investigation on thermophysical properties of binary/ternary mixtures of 1-butyl-3-methylimidazolium trifluoromethanesulfonate with molecular solvents. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112481] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Vo P, Lu H, Ma K, Forsman J, Woodward CE. Local Grand Canonical Monte Carlo Simulation Method for Confined Fluids. J Chem Theory Comput 2019; 15:6944-6957. [PMID: 31665596 DOI: 10.1021/acs.jctc.9b00804] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We describe a new local grand canonical Monte Carlo method to treat fluids in pores in chemical equilibrium with a reference bulk. The method is applied to Lennard-Jones particles in pores of different geometry and is shown to be much more accurate and efficient than other techniques such as traditional grand canonical simulations or Widom's particle insertion method. It utilizes a penalty potential to create a gas phase, which is in equilibrium with a more dense liquid component in the pore. Grand canonical Monte Carlo moves are employed in the gas phase, and the system then maintains chemical equilibrium by "diffusion" of particles. This creates an interface, which means that the confined fluid needs to occupy a large enough volume so that this is not an issue. We also applied the method to confined charged fluids and show how it can be used to determine local electrostatic potentials in the confined fluid, which are properly referenced to the bulk. This precludes the need to determine the Donnan potential (which controls electrochemical equilibrium) explicitly. Prior approaches have used explicit bulk simulations to measure this potential difference, which are significantly costly from a computational point of view. One outcome of our analysis is that pores of finite cross-section create a potential difference with the bulk via a small but nonzero linear charge density, which diminishes as ∼1/ln(L), where L is the pore length.
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Affiliation(s)
- Phuong Vo
- School of Science , University of New South Wales, Canberra , Canberra ACT 2600 , Australia
| | - Hongduo Lu
- Department of Theoretical Chemistry, Chemical Centre , Lund University P. O. Box 124, S-22100 Lund , Sweden
| | - Ke Ma
- School of Materials Science and Engineering , Tianjin University of Technology Tianjin 300384 , People's Republic of China
| | - Jan Forsman
- Department of Theoretical Chemistry, Chemical Centre , Lund University P. O. Box 124, S-22100 Lund , Sweden
| | - Clifford E Woodward
- School of Science , University of New South Wales, Canberra , Canberra ACT 2600 , Australia
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Kundu K, Chandra GK, Umapathy S, Kiefer J. Spectroscopic and computational insights into the ion-solvent interactions in hydrated aprotic and protic ionic liquids. Phys Chem Chem Phys 2019; 21:20791-20804. [PMID: 31513201 DOI: 10.1039/c9cp03670a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Ionic liquids (ILs) and their aqueous solutions are emerging media for solving and manipulating biochemical molecules such as proteins. Unleashing the full potential however requires a detailed mechanistic understanding of how suitable protic and aprotic ILs behave in the presence of water in the first place. The present work aims at making an important step by performing a combined experimental and computational study of two selected ILs and their mixtures with water: the aprotic cholinium propionate ([Chl][Pro]) and the protic N-methyl-2-pyrrolidonium propionate ([NMP][Pro]). IR and Raman spectroscopy reveal stronger ion-solvent interactions in [Chl][Pro]-H2O systems compared to [NMP][Pro]-H2O mixtures. This can be explained by the tightly packed ion-pair associations in [NMP][Pro] comprising the protic -N+-H counterpart, which allows the establishment of highly directional and strong interionic hydrogen bonds. The spectral decomposition of the O-D stretching band into three sub-peaks showed that the protic [NMP][Pro] favors the self-association of water molecules. On the other hand, the predominant fraction of water-anion/cation aggregates exists in aprotic [Chl][Pro]. These hydrated systems can be envisaged using quantum-chemical calculations in the following way: H2O[Chl]+H2O[Pro]-H2O and H2O[NMP]+[Pro]-H2O, which implied preferable solvent-shared ion-pair (SIP) configurations for [Chl][Pro]-H2O systems, whereas the contact ion-pair (CIP) state prevails for the [NMP][Pro]-H2O systems. The latter holds even in the water-rich regime. In future work, these findings will be the basis for an understanding of the underlying principles that govern the interactions of ions with bio-molecules in aqueous solutions.
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Affiliation(s)
- Kaushik Kundu
- Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore 560 012, Karnataka, India
| | - Goutam K Chandra
- Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore 560 012, Karnataka, India and Department of Physics, National Institute of Technology Calicut, Kozhikode 673601, Kerala, India
| | - Siva Umapathy
- Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore 560 012, Karnataka, India and Indian Institute of Science Education and Research, Bhopal Bhopal Bypass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India.
| | - Johannes Kiefer
- Technische Thermodynamik and MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany.
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Docampo-Álvarez B, Gómez-González V, Cabeza O, Ivaništšev VB, Gallego LJ, Varela LM. Molecular dynamics simulations of novel electrolytes based on mixtures of protic and aprotic ionic liquids at the electrochemical interface: Structure and capacitance of the electric double layer. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Walz MM, Ghahremanpour MM, van Maaren PJ, van der Spoel D. Phase-Transferable Force Field for Alkali Halides. J Chem Theory Comput 2018; 14:5933-5948. [DOI: 10.1021/acs.jctc.8b00507] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marie-Madeleine Walz
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Box 596, SE-75124 Uppsala, Sweden
| | - Mohammad M. Ghahremanpour
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Box 596, SE-75124 Uppsala, Sweden
| | - Paul J. van Maaren
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Box 596, SE-75124 Uppsala, Sweden
| | - David van der Spoel
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Box 596, SE-75124 Uppsala, Sweden
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Gutiérrez A, Atilhan M, Alcalde R, Trenzado J, Aparicio S. Insights on the mixtures of imidazolium based ionic liquids with molecular solvents. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.01.167] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Aspects of solvent polarity and solvent properties in developing efficient systems for processing biomass with ionic liquid mixtures and supercritical CO2. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2017.12.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Docampo-Álvarez B, Gómez-González V, Méndez-Morales T, Rodríguez JR, Cabeza O, Turmine M, Gallego LJ, Varela LM. The effect of alkyl chain length on the structure and thermodynamics of protic–aprotic ionic liquid mixtures: a molecular dynamics study. Phys Chem Chem Phys 2018; 20:9938-9949. [DOI: 10.1039/c8cp00575c] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mixtures of protic and aprotic ionic liquids exhibit non-ideal behavior with increasing alkyl chain length, caused by the formation of molecular complexes.
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Affiliation(s)
- Borja Docampo-Álvarez
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Víctor Gómez-González
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Trinidad Méndez-Morales
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Julio R. Rodríguez
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Oscar Cabeza
- Departamento de Física e Ciencias da Terra
- Facultade de Ciencias
- Universidade da Coruña
- Campus A Zapateira s/n
- E-15071 A Coruña
| | - Mireille Turmine
- Sorbonne Université
- CNRS
- Laboratoire Interfaces et Systèmes Electrochimiques
- LISE
- Paris
| | - Luis J. Gallego
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Luis M. Varela
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas
- Facultade de Física
- Universidade de Santiago de Compostela
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Gómez-González V, Docampo-Álvarez B, Montes-Campos H, Otero JC, Lago EL, Cabeza O, Gallego LJ, Varela LM. Solvation of Al3+ cations in bulk and confined protic ionic liquids: a computational study. Phys Chem Chem Phys 2018; 20:19071-19081. [DOI: 10.1039/c8cp02933d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanostructured solvation of Al3+ in an EAN ionic liquid, forming octahedral complexes with nitrate anions.
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Affiliation(s)
- Víctor Gómez-González
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas y Departamento de Física Aplicada
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Borja Docampo-Álvarez
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas y Departamento de Física Aplicada
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Hadrián Montes-Campos
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas y Departamento de Física Aplicada
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Juan Carlos Otero
- Universidad de Málaga
- Andalucía Tech
- Facultad de Ciencias
- Departamento de Química Física
- Unidad Asociada CSIC
| | - Elena López Lago
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas y Departamento de Física Aplicada
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Oscar Cabeza
- Departamento de Física y Ciencias de la Tierra
- Facultade de Ciencias
- Universidade da Coruña
- Campus A Zapateira s/n
- E-15071 A Coruña
| | - Luis J. Gallego
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas y Departamento de Física Aplicada
- Facultade de Física
- Universidade de Santiago de Compostela
| | - Luis M. Varela
- Grupo de Nanomateriales
- Fotónica y Materia Blanda
- Departamento de Física de Partículas y Departamento de Física Aplicada
- Facultade de Física
- Universidade de Santiago de Compostela
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Russina O, Lo Celso F, Plechkova NV, Triolo A. Emerging Evidences of Mesoscopic-Scale Complexity in Neat Ionic Liquids and Their Mixtures. J Phys Chem Lett 2017; 8:1197-1204. [PMID: 28234000 DOI: 10.1021/acs.jpclett.6b02811] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Ionic liquids (ILs) represent a blooming class of continuously developing advanced materials, with the aiming of a green chemical industry. Their appealing physical and chemical properties are largely influenced by their micro- and mesoscopic structure that is known to possess a high degree of hierarchical organization. High-impact application fields are largely affected by the complex morphology of neat ionic liquids and their mixtures. This Perspective highlights new arising research directions that point to an enhanced level of structural complexity in several IL-based systems, including mixtures. The latter represent a change in paradigm in the approach to formulate new, task-specific IL-based media, and the reported phenomenology has the potential to further expand their range of applications by calling for a revisitation of the nature of interactions in these exciting media.
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Affiliation(s)
- Olga Russina
- Dipartimento di Chimica, Università di Roma Sapienza , Rome 00185, Italy
| | - Fabrizio Lo Celso
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo , viale delle Scienze, ed. 17, 90128 Palermo, Italy
| | - Natalia V Plechkova
- QUILL, The Queen's University of Belfast , Stranmillis Road, Belfast, Northern Ireland, United Kingdom BT9 5AG
| | - Alessandro Triolo
- Laboratorio Liquidi Ionici, Istituto Struttura della Materia, Consiglio Nazionale delle Ricerche , Rome 00133, Italy
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