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Interfacial Water at Graphene Oxide Surface: Ordered or Disordered?

Visal Subasinghege Don1, Rolf David1,2, Pu Du1

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The Journal of Physical Chemistry. B
|January 30, 2019
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This summary is machine-generated.

Simulating the graphene oxide-water interface reveals Born-Oppenheimer molecular dynamics (BOMD) shows less structured water than classical force fields. This highlights the importance of induction forces in understanding interfacial behavior.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Surface science

Background:

  • Graphene oxide (GO) is a promising material for various applications due to its unique properties.
  • Understanding the GO-water interface is crucial for optimizing its performance in aqueous environments.
  • Classical force fields often simplify molecular interactions, potentially limiting accuracy.

Purpose of the Study:

  • To compare the accuracy of different simulation methods for the GO-water interface.
  • To investigate the structural behavior of water molecules at the GO-water interface.
  • To analyze the contributions of different interaction components to interfacial energy.

Main Methods:

  • Born-Oppenheimer molecular dynamics (BOMD) simulations using revPBE-D3 and BLYP-D2 functionals.
  • Classical molecular dynamics simulations using the OPLS-AA force field.
  • Analysis of water molecule orientation and order parameters.
  • Higher-level symmetry-adapted perturbation theory (SAPT) calculations.

Main Results:

  • BOMD simulations showed significantly less structured interfacial water compared to the OPLS-AA force field.
  • The classical force field predicted a strongly ordered water interface.
  • SAPT calculations confirmed the importance of induction contributions to interaction energies.
  • Multiple conformations exhibited similar interaction energies, suggesting complex interfacial dynamics.

Conclusions:

  • BOMD simulations provide a more realistic description of the GO-water interface compared to classical force fields.
  • The ordering of water at the GO interface is less pronounced than predicted by classical models.
  • Accurate modeling of interfacial phenomena requires consideration of electronic contributions like induction.