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Besford QA, Van den Heuvel W, Christofferson AJ. Dipolar Dispersion Forces in Water-Methanol Mixtures: Enhancement of Water Interactions upon Dilution Drives Self-Association. J Phys Chem B 2022; 126:6231-6239. [PMID: 35976055 DOI: 10.1021/acs.jpcb.2c04638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mixtures of short-chain alcohols and water produce anomalous thermodynamic and structural quantities, including molecular segregation into water-rich and alcohol-rich components. Herein, we used molecular dynamics simulations with polarizable models to investigate interactions that could drive the self-association of water molecules in mixtures with methanol (MeOH). As water was diluted with MeOH, significant changes in the distribution of molecules and solvation properties occurred, where water exhibited a clear preference for self-association. When common structural quantities were analyzed, it was found that there was a clear reduction in water-water hydrogen bonding and tetrahedral order (both in terms of typical bulk behavior), contrary to the observed water self-association. However, when dipolar dispersion forces between all molecules as a function of system composition were analyzed, it was found that water-water dipolar interactions became significantly stronger with dilution (6-fold stronger interaction in 75% MeOH compared to 0% MeOH). This was only observed for water, where MeOH-MeOH interactions became weaker as the systems were more dilute in MeOH. These forces result from specific dipole orientations, likely occurring to adopt lower energy configurations (i.e., head-to-tail or antiparallel). For water, this may result from lost other interactions (e.g., hydrogen bonding), leading to more rotational freedom between the dipole moments. These intriguing changes in dipolar interactions, which directly result from structural changes, can therefore explain, in part, the driving force for water self-association in MeOH-water mixtures.
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Affiliation(s)
- Quinn A Besford
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Willem Van den Heuvel
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Andrew J Christofferson
- School of Science, STEM College, RMIT University, Melbourne, Victoria 3001, Australia.,ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne, Victoria 3001, Australia
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2
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Odendahl NL, Geissler PL. Local Ice-like Structure at the Liquid Water Surface. J Am Chem Soc 2022; 144:11178-11188. [PMID: 35696525 DOI: 10.1021/jacs.2c01827] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Experiments and computer simulations have established that liquid water's surfaces can deviate in important ways from familiar bulk behavior. Even in the simplest case of an air-water interface, distinctive layering, orientational biases, and hydrogen bond arrangements have been reported, but an overarching picture of their origins and relationships has been incomplete. Here we show that a broad set of such observations can be understood through an analogy with the basal face of crystalline ice. Using simulations, we demonstrate a number of structural similarities between water and ice surfaces, suggesting the presence of domains at the air-water interface with ice-like features that persist over 2-3 molecular diameters. Most prominent is a shared characteristic layering of molecular density and orientation perpendicular to the interface. Lateral correlations of hydrogen bond network geometry point to structural similarities in the parallel direction as well. Our results bolster and significantly extend previous conceptions of ice-like structure at the liquid's boundary and suggest that the much-discussed quasi-liquid layer on ice evolves subtly above the melting point into a quasi-ice layer at the surface of liquid water.
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Affiliation(s)
- Nathan L Odendahl
- Department of Chemistry, University of California, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Phillip L Geissler
- Department of Chemistry, University of California, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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3
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Besford QA, Schubotz S, Chae S, Özdabak Sert AB, Weiss ACG, Auernhammer GK, Uhlmann P, Farinha JPS, Fery A. Molecular Transport within Polymer Brushes: A FRET View at Aqueous Interfaces. Molecules 2022; 27:molecules27093043. [PMID: 35566393 PMCID: PMC9102696 DOI: 10.3390/molecules27093043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 05/04/2022] [Accepted: 05/05/2022] [Indexed: 11/17/2022] Open
Abstract
Molecular permeability through polymer brush chains is implicated in surface lubrication, wettability, and solute capture and release. Probing molecular transport through polymer brushes can reveal information on the polymer nanostructure, with a permeability that is dependent on chain conformation and grafting density. Herein, we introduce a brush system to study the molecular transport of fluorophores from an aqueous droplet into the external “dry” polymer brush with the vapour phase above. The brushes consist of a random copolymer of N-isopropylacrylamide and a Förster resonance energy transfer (FRET) donor-labelled monomer, forming ultrathin brush architectures of about 35 nm in solvated height. Aqueous droplets containing a separate FRET acceptor are placed onto the surfaces, with FRET monitored spatially around the 3-phase contact line. FRET is used to monitor the transport from the droplet to the outside brush, and the changing internal distributions with time as the droplets prepare to recede. This reveals information on the dynamics and distances involved in the molecular transport of the FRET acceptor towards and away from the droplet contact line, which are strongly dependent on the relative humidity of the system. We anticipate our system to be extremely useful for studying lubrication dynamics and surface droplet wettability processes.
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Affiliation(s)
- Quinn A. Besford
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
- Correspondence: (Q.A.B.); (A.F.)
| | - Simon Schubotz
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Soosang Chae
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Ayşe B. Özdabak Sert
- Molecular Biology and Genetics Department, Istanbul Technical University, 34469 Istanbul, Turkey;
| | - Alessia C. G. Weiss
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Günter K. Auernhammer
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Petra Uhlmann
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - José Paulo S. Farinha
- Centro de Química Estrutural, Department of Chemical Engineering, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
- Correspondence: (Q.A.B.); (A.F.)
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4
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Kadaoluwa Pathirannahalage SP, Meftahi N, Elbourne A, Weiss ACG, McConville CF, Padua A, Winkler DA, Costa Gomes M, Greaves TL, Le TC, Besford QA, Christofferson AJ. Systematic Comparison of the Structural and Dynamic Properties of Commonly Used Water Models for Molecular Dynamics Simulations. J Chem Inf Model 2021; 61:4521-4536. [PMID: 34406000 DOI: 10.1021/acs.jcim.1c00794] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Water is a unique solvent that is ubiquitous in biology and present in a variety of solutions, mixtures, and materials settings. It therefore forms the basis for all molecular dynamics simulations of biological phenomena, as well as for many chemical, industrial, and materials investigations. Over the years, many water models have been developed, and it remains a challenge to find a single water model that accurately reproduces all experimental properties of water simultaneously. Here, we report a comprehensive comparison of structural and dynamic properties of 30 commonly used 3-point, 4-point, 5-point, and polarizable water models simulated using consistent settings and analysis methods. For the properties of density, coordination number, surface tension, dielectric constant, self-diffusion coefficient, and solvation free energy of methane, models published within the past two decades consistently show better agreement with experimental values compared to models published earlier, albeit with some notable exceptions. However, no single model reproduced all experimental values exactly, highlighting the need to carefully choose a water model for a particular study, depending on the phenomena of interest. Finally, machine learning algorithms quantified the relationship between the water model force field parameters and the resulting bulk properties, providing insight into the parameter-property relationship and illustrating the challenges of developing a water model that can accurately reproduce all properties of water simultaneously.
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Affiliation(s)
- Sachini P Kadaoluwa Pathirannahalage
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia.,Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Lyon 69342, France
| | - Nastaran Meftahi
- ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne, Victoria 3000, Australia
| | - Aaron Elbourne
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia
| | - Alessia C G Weiss
- Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Chris F McConville
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia.,Institute for Frontier Materials, Deakin University, Geelong, Victoria 3220, Australia
| | - Agilio Padua
- Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Lyon 69342, France
| | - David A Winkler
- School of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia.,Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia.,School of Pharmacy, University of Nottingham, Nottingham NG7 2QL, U.K
| | | | - Tamar L Greaves
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia
| | - Tu C Le
- School of Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Quinn A Besford
- Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Andrew J Christofferson
- School of Science, RMIT University, Melbourne, Victoria 3000, Australia.,ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne, Victoria 3000, Australia
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5
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Affiliation(s)
- Franz M Geiger
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
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Hammons JA, Besford QA, Ilavsky J, Christofferson AJ. Manipulating meso-scale solvent structure from Pd nanoparticle deposits in deep eutectic solvents. J Chem Phys 2021; 155:074505. [PMID: 34418930 DOI: 10.1063/5.0058605] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Deep Eutectic Solvents (DESs) are complex solutions that present unique challenges compared to traditional solvents. Unlike most aqueous electrolytes and ionic liquids, DESs have delicate hydrogen bond networks that are responsible for their highly sensitive compositional dependence on the melting point. Prior work has demonstrated a unique nanoscale structure both experimentally and theoretically that brings both challenges and opportunities to their adoption in traditional electrochemical processes. In this study, we use in situ sample-rotated ultra-small angle x-ray scattering to resolve the near-interface solvent structure after electrodepositing Pd nanoparticles onto a glassy carbon electrode in choline chloride:urea and choline chloride:ethylene glycol DESs. Our results indicate that a hierarchical solvent structure can be observed on the meso-scale in the choline chloride:urea and choline chloride:ethylene glycol systems. Importantly, this extended solvent structure increases between -0.3 V and -0.5 V (vs Ag/AgCl) and remains high until -0.9 V (vs Ag/AgCl). Experimentally, the nature of this structure is more pronounced in the ethylene glycol system, as evidenced by both the x-ray scattering and the electrochemical impedance spectroscopy. Molecular dynamics simulations and dipolar orientation analysis reveal that chloride delocalization near the Pd interface and long-range interactions between the choline and each hydrogen bond donor (HBD) are very different and qualitatively consistent with the experimental data. These results show how the long-range solvent-deposit interactions can be tuned by changing the HBD in the DES and the applied potential.
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Affiliation(s)
- Joshua A Hammons
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Quinn A Besford
- Leibniz-Institut für Polymerforschung e. V., Hohe Straße 6, 01069 Dresden, Germany
| | - Jan Ilavsky
- Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
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7
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Elbourne A, Besford QA, Meftahi N, Crawford RJ, Daeneke T, Greaves TL, McConville CF, Bryant G, Bryant SJ, Christofferson AJ. The Impact of Water on the Lateral Nanostructure of a Deep Eutectic Solvent–Solid Interface. Aust J Chem 2021. [DOI: 10.1071/ch21078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Deep eutectic solvents (DESs) are tuneable solvents with attractive properties for numerous applications. Their structure–property relationships are still under investigation, especially at the solid–liquid interface. Moreover, the influence of water on interfacial nanostructure must be understood for process optimization. Here, we employ a combination of atomic force microscopy and molecular dynamics simulations to determine the lateral and surface-normal nanostructure of the DES choline chloride:glycerol at the mica interface with different concentrations of water. For the neat DES system, the lateral nanostructure is driven by polar interactions. The surface adsorbed layer forms a distinct rhomboidal symmetry, with a repeat spacing of ~0.9 nm, comprising all DES species. The adsorbed nanostructure remains largely unchanged in 75 mol-% DES compared with pure DES, but at 50 mol-%, the structure is broken and there is a compromise between the native DES and pure water structure. By 25 mol-% DES, the water species dominates the adsorbed liquid layer, leaving very few DES species aggregates at the interface. In contrast, the near-surface surface-normal nanostructure, over a depth of ~3 nm from the surface, remains relatively unchanged down to 25 mol-% DES where the liquid arrangement changed. These results demonstrate not only the significant influence that water has on liquid nanostructure, but also show that there is an asymmetric effect whereby water disrupts the nanostructure to a greater degree closer to the surface. This work provides insight into the complex interactions between DES and water and may enhance their optimization for surface-based applications.
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8
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Elbourne A, Meftahi N, Greaves TL, McConville CF, Bryant G, Bryant SJ, Christofferson AJ. Nanostructure of a deep eutectic solvent at solid interfaces. J Colloid Interface Sci 2021; 591:38-51. [PMID: 33592524 DOI: 10.1016/j.jcis.2021.01.089] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 12/24/2022]
Abstract
HYPOTHESIS Deep eutectic solvents (DESs) are an attractive class of tunable solvents. However, their uptake for relevant applications has been limited due to a lack of detailed information on their structure-property relationships, both in the bulk and at interfaces. The lateral nanostructure of the DES-solid interfaces is likely to be more complex than previously reported and requires detailed, high-resolution investigation. EXPERIMENTS We employ a combination of high-resolution amplitude-modulated atomic force microscopy and molecular dynamics simulations to elucidate the lateral nanostructure of a DES at the solid-liquid interface. Specifically, the lateral and near-surface nanostructure of the DES choline chloride:glycerol is probed at the mica and highly-ordered pyrolytic graphite interfaces. FINDINGS The lateral nanostructure of the DES-solid interface is heterogeneous and well-ordered in both systems. At the mica interface, the DES is strongly ordered via polar interactions. The adsorbed layer has a distinct rhomboidal symmetry with a repeat spacing of ~0.9 nm comprising all DES species. At the highly ordered pyrolytic graphite interface, the adsorbed layer appears distinctly different, forming an apolor-driven row-like structure with a repeat spacing of ~0.6 nm, which largely excludes the chloride ion. The interfacial nanostructure results from a delicate balance of substrate templating, liquid-liquid interactions, species surface affinity, and packing constraints of cations, anions, and molecular components within the DES. For both systems, distinct near-surface nanostructural layering is observed, which becomes more pronounced close to the substrate. The surface nanostructures elucidated here significantly expand our understanding of DES interfacial behavior and will enhance the optimization of DES systems for surface-based applications.
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Affiliation(s)
- Aaron Elbourne
- School of Science, RMIT University, Melbourne, VIC 3000, Australia.
| | - Nastaran Meftahi
- ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne, VIC 3001, Australia
| | - Tamar L Greaves
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Christopher F McConville
- School of Science, RMIT University, Melbourne, VIC 3000, Australia; Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia
| | - Gary Bryant
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Saffron J Bryant
- School of Science, RMIT University, Melbourne, VIC 3000, Australia.
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Besford QA, Christofferson AJ, Kalayan J, Sommer JU, Henchman RH. The Attraction of Water for Itself at Hydrophobic Quartz Interfaces. J Phys Chem B 2020; 124:6369-6375. [PMID: 32589426 DOI: 10.1021/acs.jpcb.0c04545] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Structural forces within aqueous water at a solid interface can significantly change surface reactivity and the affinity of solutes toward it. We show using molecular dynamics simulations how hydrophilic and hydrophobic quartz surfaces perturb the orientational structure of aqueous water, ultimately strengthening dipolar forces between molecules in proximity to the interface. When derived as a function of distance from each surface, it was found that both surfaces indirectly enhance the long-range dipolar attraction of water for itself toward the interfacial region. This was found to be longer-ranged for water molecules solvating the hydrophobic surface than those solvating the hydrophilic surface, with a range of up to 2.5 nm from the hydrophobic surface. Our results give direct quantification of surface-induced changes in solvent-solvent attraction, ultimately providing a counterintuitive addition to the balance of hydrophobic forces at aqueous-solid interfaces.
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Affiliation(s)
- Quinn A Besford
- Institute of Physical Chemistry and Polymer Physics, Leibniz Institute for Polymer Research Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany
| | | | - Jas Kalayan
- Manchester Institute of Biotechnology, The University of Manchester, Manchester M13 9PL, U.K.,School of Chemistry, The University of Manchester, Oxford M13 9PL, U.K
| | - Jens-Uwe Sommer
- Institute Theory of Polymers, Leibniz Institute for Polymer Research Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Richard H Henchman
- Manchester Institute of Biotechnology, The University of Manchester, Manchester M13 9PL, U.K.,School of Chemistry, The University of Manchester, Oxford M13 9PL, U.K
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Sarhangi SM, Waskasi MM, Hashemianzadeh SM, Matyushov DV. Effective Dielectric Constant of Water at the Interface with Charged C60 Fullerenes. J Phys Chem B 2019; 123:3135-3143. [DOI: 10.1021/acs.jpcb.9b00901] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Setare Mostajabi Sarhangi
- Molecular Simulation Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran
| | | | - Seyed Majid Hashemianzadeh
- Molecular Simulation Research Laboratory, Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran
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