Externally applied electric fields in liquid water can induce a plethora of effects with wide implications in electrochemistry and hydrogen-based technologies. Although some effort has been made to elucidate the thermodynamics associated with the application of electric fields in aqueous systems, to the best of our knowledge, field-induced effects on the total and local entropy of bulk water have never been presented so far. Here, we report on classical TIP4P/2005 and ab initio molecular dynamics simulations measuring entropic contributions carried by diverse field intensities in liquid water at room temperature. We find that strong fields are capable of aligning large fractions of molecular dipoles. Nevertheless, the order-maker action of the field leads to quite modest entropy reductions in classical simulations. Albeit more significant variations are recorded during first-principles simulations, the associated entropy modifications are small compared to the entropy change involved in the freezing phenomenon, even at intense fields slightly beneath the molecular dissociation threshold. This finding further corroborates the idea that electrofreezing (i.e., the electric-field-induced crystallization) cannot take place in bulk water at room temperature. In addition, here, we propose a molecular-dynamics-based analysis (3D-2PT) that spatially resolves the local entropy and the number density of bulk water under an electric field, which enables us to map their field-induced changes in the environment of reference H2O molecules. By returning detailed spatial maps of the local order, the proposed approach is capable of establishing a link between entropic and structural modifications with atomistic resolution.
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Electric-field induced entropic effects in liquid water
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14 May 2023
Research Article|
May 08 2023
Electric-field induced entropic effects in liquid water
Special Collection:
2023 JCP Emerging Investigators Special Collection
Valeria Conti Nibali
;
Valeria Conti Nibali
(Data curation, Formal analysis, Investigation, Writing – original draft, Writing – review & editing)
1
Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina
, 98166 Messina, Italy
2
Institute for Chemical-Physical Processes, National Research Council of Italy (IPCF-CNR)
, 98158 Messina, Italy
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Sthitadhi Maiti
;
Sthitadhi Maiti
(Data curation, Formal analysis, Investigation, Methodology)
3
School of Molecular Sciences, Arizona State University
, Tempe, Arizona 85287, USA
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Franz Saija
;
Franz Saija
(Conceptualization, Investigation, Supervision)
2
Institute for Chemical-Physical Processes, National Research Council of Italy (IPCF-CNR)
, 98158 Messina, Italy
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Matthias Heyden
;
Matthias Heyden
a)
(Data curation, Formal analysis, Investigation, Methodology, Resources, Software, Writing – review & editing)
3
School of Molecular Sciences, Arizona State University
, Tempe, Arizona 85287, USA
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Giuseppe Cassone
Giuseppe Cassone
b)
(Conceptualization, Data curation, Formal analysis, Investigation, Resources, Supervision, Writing – original draft, Writing – review & editing)
2
Institute for Chemical-Physical Processes, National Research Council of Italy (IPCF-CNR)
, 98158 Messina, Italy
b)Author to whom correspondence should be addressed: cassone@ipcf.cnr.it
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b)Author to whom correspondence should be addressed: cassone@ipcf.cnr.it
a)
Electronic mail: heyden@asu.edu
Note: This paper is part of the 2023 JCP Emerging Investigators Special Collection.
J. Chem. Phys. 158, 184501 (2023)
Article history
Received:
December 20 2022
Accepted:
March 13 2023
Citation
Valeria Conti Nibali, Sthitadhi Maiti, Franz Saija, Matthias Heyden, Giuseppe Cassone; Electric-field induced entropic effects in liquid water. J. Chem. Phys. 14 May 2023; 158 (18): 184501. https://doi.org/10.1063/5.0139460
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