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ReaxFF molecular dynamics simulations on the structure and dynamics of electrolyte water systems at ambient temperature

Evidence and attribution

Authority of statements

This ingest is an Elsevier corrected proof (papers/Nabankur_2019_CompMatSci_electrolyte_in_press.pdf) for the same article as 2019dasgupta-computationa-reaxff-molecular. Table and figure numbering follow the published volume.

Summary

ReaxFF molecular dynamics studies aqueous LiCl, NaCl, and KCl at 1–5 M (plus pure water) at 300 K using the Fedkin et al. electrolyte–water parameterization, reporting RDFs, angular distributions in the first hydration shell, H-bond and reorientational dynamics, residence times, and diffusion coefficients. This slug is an in-press / proof PDF variant; science matches 2019dasgupta-computationa-reaxff-molecular. Ambient electrolyte structure benchmarks are useful for battery electrolyte screening and for validating force-field ion–water couplings before interfacial runs add electrode chemistry.

Methods

Molecular dynamics (MD) systems (same article as VOR). 1000 water molecules (pure water) or 700 water molecules plus stoichiometric salt for 1–5 M LiCl, NaCl, and KCl; atom counts follow from those water counts plus the ions tabulated on [[2019dasgupta-computationa-reaxff-molecular]] (Table 1). Box volumes use ion van der Waals radii and target concentration as in the published Computational details.

Protocol. Minimization, compression, heating to 300 K, 100 ps equilibration, 0.5 ns production, 0.25 fs timestep, PBC, and Berendsen thermostat (100 fs damping) as summarized on the canonical page.

Ion concentration series. The authors keep box construction and neutralization conventions consistent across concentrations so RDF comparisons are meaningful.

Engine / code. LAMMPS with ReaxFF (same article as [[2019dasgupta-computationa-reaxff-molecular]]; this duplicate-ingest note does not add a separate engine declaration beyond that canonical record).

Barostat / pressure. N/A — fixed-volume (NVT-like) workflow without NPT hydrostatic pressure servocontrol (see canonical page).

Findings

  • ReaxFF reproduces solvation-shell structure and angular behavior in line with cited DFT/literature references; salt concentration reduces water self-diffusivity in the regimes reported, with mechanistic discussion of transient ionic species on 2019dasgupta-computationa-reaxff-molecular.
  • Cation-specific ordering trends (Li vs Na vs K) are interpreted through hydration strength and pair correlation shifts summarized on the canonical page.

Limitations

Proof layout may differ cosmetically from the paginated Comput. Mater. Sci. article; sub-ns segments and finite-size effects apply as on the canonical page.

Curation note: this duplicate exists because the corpus retained both in-press and final PDF filenames; DOI 10.1016/j.commatsci.2019.109349 is single—keep one canonical narrative on 2019dasgupta-computationa-reaxff-molecular and use this page for provenance of the alternate bytes. Chunk builders should hash the canonical page’s sections when generating Phase 5 IDs for this topic. Ambient 300 K production length 0.5 ns matches the canonical Comput. Mater. Sci. protocol table.

Relevance to group

van Duin co-authorship on ambient electrolyte–water ReaxFF built on the Fedkin line; this entry tracks alternate PDF bytes only.

Citations and evidence anchors

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