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Filippov LO, Silva LA, Pereira AM, Bastos LC, Correia JC, Silva K, Piçarra A, Foucaud Y. Molecular models of hematite, goethite, kaolinite, and quartz: Surface terminations, ionic interactions, nano topography, and water coordination. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Cox SJ. A theory for the stabilization of polar crystal surfaces by a liquid environment. J Chem Phys 2022; 157:094701. [PMID: 36075740 DOI: 10.1063/5.0097531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Polar crystal surfaces play an important role in the functionality of many materials and have been studied extensively over many decades. In this article, a theoretical framework is presented that extends existing theories by placing the surrounding solution environment on an equal footing with the crystal itself; this is advantageous, e.g., when considering processes such as crystal growth from solution. By considering the polar crystal as a stack of parallel plate capacitors immersed in a solution environment, the equilibrium adsorbed surface charge density is derived by minimizing the free energy of the system. In analogy to the well-known diverging surface energy of a polar crystal surface at zero temperature, for a crystal in solution it is shown that the "polar catastrophe" manifests as a diverging free energy cost to perturb the system from equilibrium. Going further than existing theories, the present formulation predicts that fluctuations in the adsorbed surface charge density become increasingly suppressed with increasing crystal thickness. We also show how, in the slab geometry often employed in both theoretical and computational studies of interfaces, an electric displacement field emerges as an electrostatic boundary condition, the origins of which are rooted in the slab geometry itself, rather than the use of periodic boundary conditions. This aspect of the work provides a firmer theoretical basis for the recent observation that standard "slab corrections" fail to correctly describe, even qualitatively, polar crystal surfaces in solution.
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Affiliation(s)
- Stephen J Cox
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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3
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Javitt LF, Curland S, Weissbuch I, Ehre D, Lahav M, Lubomirsky I. Chemical Nature of Heterogeneous Electrofreezing of Supercooled Water Revealed on Polar (Pyroelectric) Surfaces. Acc Chem Res 2022; 55:1383-1394. [PMID: 35504292 PMCID: PMC9118552 DOI: 10.1021/acs.accounts.2c00004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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The ability to control the icing temperature
of supercooled water
(SCW) is of supreme importance in subfields of pure and applied sciences.
The ice freezing of SCW can be influenced heterogeneously by electric
effects, a process known as electrofreezing. This effect was first
discovered during the 19th century; however, its mechanism is still
under debate. In this Account we demonstrate, by capitalizing on the
properties of polar crystals, that heterogeneous electrofreezing of
SCW is a chemical process influenced by an electric field and specific
ions. Polar crystals possess a net dipole moment. In addition, they
are pyroelectric, displaying short-lived surface charges at their
hemihedral faces at the two poles of the crystals as a result of temperature
changes. Accordingly, during cooling or heating, an electric field
is created, which is negated by the attraction of compensating charges
from the environment. This process had an impact in the following
experiments. The icing temperatures of SCW within crevices of polar
crystals are higher in comparison to icing temperatures within crevices
of nonpolar analogs. The role played by the electric effect was extricated
from other effects by the performance of icing experiments on the
surfaces of pyroelectric quasi-amorphous SrTiO3. During
those studies it was found that on positively charged surfaces the
icing temperature of SCW is elevated, whereas on negatively charged
surfaces it is reduced. Following investigations discovered that the
icing temperature of SCW is impacted by an ionic current created within
a hydrated layer on top of hydrophilic faces residing parallel to
the polar axes of the crystals. In the absence of such current on
analogous hydrophobic surfaces, the pyroelectric effect does not influence
the icing temperature of SCW. Those results implied that electrofreezing
of SCW is a process influenced by specific compensating ions attracted
by the pyroelectric field from the aqueous solution. When freezing
experiments are performed in an open atmosphere, bicarbonate and hydronium
ions, created by the dissolution of atmospheric CO2 in
water, influence the icing temperature. The bicarbonate ions, when
attracted by positively charged pyroelectric surfaces, elevate the
icing temperature, whereas their counterparts, hydronium ions, when
attracted by the negatively charged surfaces reduce the icing temperature.
Molecular dynamic simulations suggested that bicarbonate ions, concentrated
within the near positively charged interfacial layer, self-assemble
with water molecules to create stabilized slightly distorted “ice-like”
hexagonal assemblies which mimic the hexagons of the crystals of ice.
This occurs by replacing, within those ice-like hexagons, two hydrogen
bonds of water by C–O bonds of the HCO3– ion. On the basis of these simulations, it was predicted and experimentally
confirmed that other trigonal planar ions such as NO3–, guanidinium+, and the quasi-hexagonal
biguanidinium+ ion elevate the icing temperature. These
ions were coined as “ice makers”. Other ions including
hydronium, Cl–, and SO4–2 interfere with the formation of ice-like assemblies and operate
as “ice breakers”. The higher icing temperatures induced
within the crevices of the hydrophobic polar crystals in comparison
to the nonpolar analogs can be attributed to the proton ordering of
the water molecules. In contrast, the icing temperatures on related
hydrophilic surfaces are influenced both by compensating charges and
by proton ordering.
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Affiliation(s)
- Leah Fuhrman Javitt
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Sofia Curland
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Isabelle Weissbuch
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - David Ehre
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Meir Lahav
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Igor Lubomirsky
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 7610001, Israel
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4
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Zen A, Bui T, Bao Le TT, Tay WJ, Chellappah K, Collins IR, Rickman RD, Striolo A, Michaelides A. Long-Range Ionic and Short-Range Hydration Effects Govern Strongly Anisotropic Clay Nanoparticle Interactions. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:8143-8151. [PMID: 35592734 PMCID: PMC9109138 DOI: 10.1021/acs.jpcc.2c01306] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/14/2022] [Indexed: 06/15/2023]
Abstract
The aggregation of clay particles in aqueous solution is a ubiquitous everyday process of broad environmental and technological importance. However, it is poorly understood at the all-important atomistic level since it depends on a complex and dynamic interplay of solvent-mediated electrostatic, hydrogen bonding, and dispersion interactions. With this in mind, we have performed an extensive set of classical molecular dynamics simulations (included enhanced sampling simulations) on the interactions between model kaolinite nanoparticles in pure and salty water. Our simulations reveal highly anisotropic behavior, in which the interaction between the nanoparticles varies from attractive to repulsive depending on the relative orientation of the nanoparticles. Detailed analysis reveals that at large separation (>1.5 nm), this interaction is dominated by electrostatic effects, whereas at smaller separations, the nature of the water hydration structure becomes critical. This study highlights an incredible richness in how clay nanoparticles interact, which should be accounted for in, for example, coarse-grained models of clay nanoparticle aggregation.
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Affiliation(s)
- Andrea Zen
- Dipartimento
di Fisica Ettore Pancini, Università
di Napoli Federico II, Monte S. Angelo, I-80126 Napoli, Italy
- Department
of Earth Sciences, University College London, Gower Street, London WC1E 6BT, U.K.
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, U.K.
| | - Tai Bui
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, U.K.
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E
6BT, U.K.
| | - Tran Thi Bao Le
- Department
of Chemical Engineering, University College
London, WC1E 7JE London, U.K.
| | - Weparn J. Tay
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
| | - Kuhan Chellappah
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
| | - Ian R. Collins
- BP
Exploration Operating Co. Ltd, Chertsey Road, Thames TW16 7LN, U.K.
| | | | - Alberto Striolo
- Department
of Chemical Engineering, University College
London, WC1E 7JE London, U.K.
- School
of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Angelos Michaelides
- Thomas
Young Centre and London Centre for Nanotechnology, 17−19 Gordon Street, London WC1H 0AH, U.K.
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E
6BT, U.K.
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
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5
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Whale TF. Disordering effect of the ammonium cation accounts for anomalous enhancement of heterogeneous ice nucleation. J Chem Phys 2022; 156:144503. [DOI: 10.1063/5.0084635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Heterogeneous nucleation of ice from supercooled water is the process responsible for triggering nearly all ice formation in the natural environment. Understanding of heterogeneous ice nucleation is particularly key for understanding the formation of ice in clouds, which impacts weather and climate. While many effective ice nucleators are known the mechanisms of their actions remain poorly understood. Some inorganic nucleators have been found to nucleate ice at warmer temperatures in dilute ammonium solution than in pure water. This is surprising, analogous to salty water melting at a warmer temperature than pure water. Here, the magnitude of this effect is rationalized as being due to thermodynamically favorable ammonium-induced disordering of the hydrogen bond network of ice critical clusters formed on inorganic ice nucleators. Theoretical calculations are shown to be consistent with new experimental measurements aimed at finding the maximum magnitude of the effect. The implication of this study is that the ice-nucleating sites and surfaces of many inorganic ice nucleators are either polar or charged and therefore tend to induce formation of hydrogen ordered ice clusters. This work corroborates various literature reports indicating that some inorganic ice nucleators are most effective when nominally neutral and implies a commonality in mechanism between a wide range of inorganic ice nucleators.
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Affiliation(s)
- Thomas F Whale
- Department of Chemistry, University of Warwick, United Kingdom
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Gao A, Remsing RC. Self-consistent determination of long-range electrostatics in neural network potentials. Nat Commun 2022; 13:1572. [PMID: 35322046 PMCID: PMC8943018 DOI: 10.1038/s41467-022-29243-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 03/07/2022] [Indexed: 12/19/2022] Open
Abstract
Machine learning has the potential to revolutionize the field of molecular simulation through the development of efficient and accurate models of interatomic interactions. Neural networks can model interactions with the accuracy of quantum mechanics-based calculations, but with a fraction of the cost, enabling simulations of large systems over long timescales. However, implicit in the construction of neural network potentials is an assumption of locality, wherein atomic arrangements on the nanometer-scale are used to learn interatomic interactions. Because of this assumption, the resulting neural network models cannot describe long-range interactions that play critical roles in dielectric screening and chemical reactivity. Here, we address this issue by introducing the self-consistent field neural network - a general approach for learning the long-range response of molecular systems in neural network potentials that relies on a physically meaningful separation of the interatomic interactions - and demonstrate its utility by modeling liquid water with and without applied fields.
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Affiliation(s)
- Ang Gao
- Department of Physics, Beijing University of Posts and Telecommunications, 100876, Beijing, China.
| | - Richard C Remsing
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, 08854, USA.
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7
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Ceriotti M, Jensen L, Manolopoulos DE, Martinez TJ, Michaelides A, Ogilvie JP, Reichman DR, Shi Q, Straub JE, Vega C, Wang LS, Weiss E, Zhu X, Stein JL, Lian T. 2020 JCP Emerging Investigator Special Collection. J Chem Phys 2021; 155:230401. [PMID: 34937385 DOI: 10.1063/5.0078934] [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)
- Michele Ceriotti
- Laboratory of Computational Science and Modeling, Institute of Materials, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Lasse Jensen
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - David E Manolopoulos
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Todd J Martinez
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Angelos Michaelides
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Jennifer P Ogilvie
- Department of Physics and Biophysics, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA
| | - David R Reichman
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Qiang Shi
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; and Physical Science Laboratory, Huairou National Comprehensive Science Center, Beijing 101407, China
| | - John E Straub
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
| | - Carlos Vega
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Lai-Sheng Wang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA
| | - Emily Weiss
- Departments of Chemistry, Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Xiaoyang Zhu
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | | | - Tianquan Lian
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
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