Skip to content

ReaxFF Reactive Force Field Study of the Dissociation of Water on Titania Surfaces

Evidence and attribution

Authority of statements

Prose sections below (Summary, Methods, Findings, etc.) are curated summaries of the publication identified by doi, title, and pdf_path in the front matter above. They are not new primary claims by this wiki.

For definitive numerical values, reaction schemes, and interpretations, use the peer-reviewed article (and optional records under normalized/papers/ when present)—not this page alone.

Summary

Water–titania interactions underpin photocatalysis, solar cells, sensors, and biomaterials, yet atomistic models must balance reactivity with system size for wet interfaces. This J. Phys. Chem. C study—duplicated in the corpus as paper:2013raju-venue-jp-2013-02139h under a distinct PDF filename—uses a Ti/O/H ReaxFF parametrization to simulate adsorption and dissociation of water at 300 K on anatase (101), (100), (112), (001) and rutile (110) surfaces across multiple coverages. The authors compare molecular versus dissociative arrangements against DFT and experiment, then quantify dissociation extent as a function of facet and coverage, relating trends to hydrogen-bond coupling between adsorbed and outer water layers.

Methods

Grounding: papers/Raju_TiO2_water_JPC_C_2013.pdf; normalized/extracts/2013raju-venue-jp402139h_p1-2.txt (abstract + early Methods; overlaps DOI 10.1021/jp402139h with 2013raju-venue-jp402139h-2).

1 — MD application (same article text as 2013raju-venue-jp402139h-2)

For numerical MD settings (ensemble, timestep, thermostat coupling, segment lengths, ML definitions, and coverage grid), this wiki’s most explicit excerpt-backed summary lives on paper:2013raju-venue-jp402139h-2 (normalized/extracts/2013raju-venue-jp402139h-2_p1-2.txt). At a high level, the work studies water at 300 K on anatase (101), (100), (112), (001) and rutile (110) with multiple coverages using a recently developed Ti/O/H ReaxFF reactive model (abstract).

  • Engine / code: Molecular dynamics with ReaxFF as in the abstract; software packaging is specified on the continued Methods pages—see 2013raju-venue-jp402139h-2 (ADF ReaxFF implementation there).
  • System size & composition: Water + periodic TiO\(_2\) slab interfacial cells with random initial water placements at 0.50–3.0 ML coverages (ML defined vs Ti\(_{5c}\) sites) as detailed on 2013raju-venue-jp402139h-2; explicit atom counts are not copied onto this duplicate-PDF wiki page—read pdf_path tables.
  • System / boundary / ensemble / timestep / thermostat / duration / coverage: See 2013raju-venue-jp402139h-2 for excerpt-backed values (NVT, 0.25 fs, Berendsen 100 fs, 500 ps protocol, 0.50–3.0 ML grid).
  • Barostat: N/A — NVT as on 2013raju-venue-jp402139h-2.
  • Temperature: 300 K (abstract).
  • Pressure: N/A.
  • Electric field: N/A.
  • Replica / enhanced sampling: N/A.

2 — Force-field training

N/A — application/validation of a published Ti/O/H ReaxFF parameterization with extensive ReaxFF methodology exposition (extract), not a new parametrization paper.

Findings

  • Outcomes & mechanisms: Abstract-level results match 2013raju-venue-jp402139h-2: facet- and coverage-dependent water structuring, dissociation extents broadly consistent with prior DFT/experiment, and a demonstrated correlation between dissociation and H-bonding to non-adsorbed water via O–H stretch red shifts for adsorbed water.
  • Comparisons: Explicit comparisons to prior DFT catalogs and experimental adsorption/dissociation literature are claimed in the abstract.
  • Sensitivity / design levers: Facet and coverage are the primary knobs in the abstract framing; temperature is fixed at 300 K in the abstract statement.
  • Limitations & outlook: N/A — not captured on p1–2 extract for this slug; consult full PDF.
  • Corpus honesty: Duplicate PDF filename variant in the corpus for the same article; use paper:2013raju-venue-jp402139h-2 when you need Methods numbers from a shorter, operator-indexed extract.

Limitations

Duplicate corpus path for the same article generation; full quantitative tables appear beyond the p1–2 extract.

Relevance to group

Core oxide–electrolyte interface science with van Duin authorship; feeds later TiO₂ nanocrystal aggregation and battery-adjacent interface work in the corpus.

Citations and evidence anchors

  • Footer: J. Phys. Chem. C 2013, 117, 10558–10572 and DOI 10.1021/jp402139h (extract page 2).
  • Abstract (extract page 1).