Molecular dynamics simulations for the prediction of the dielectric spectra of alcohols, glycols, and monoethanolamine

Javier Cardona, Rui Fartaria, Martin B. Sweatman, Leo Lue

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19 Citations (Scopus)
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Abstract

The response of molecular systems to electromagnetic radiation in the microwave region (0.3–300 GHz) has been principally studied experimentally, using broadband dielectric spectroscopy. However, relaxation times corresponding to reorganisation of molecular dipoles due to their interaction with electromagnetic radiation at microwave frequencies are within the scope of modern molecular simulations. In this work, fluctuations of the total dipole moment of a molecular system, obtained through molecular dynamics simulations, are used to determine the dielectric spectra of water, a series of alcohols and glycols, and monoethanolamine. Although the force fields employed in this study have principally been developed to describe thermodynamic properties, most them give fairly good predictions of this dynamical property for these systems. However, the inaccuracy of some models and the long simulation times required for the accurate estimation of the static dielectric constant can sometimes be problematic. We show that the use of the experimental value for the static dielectric constant in the calculations, instead of the one predicted by the different models, yields satisfactory results for the dielectric spectra, and hence the heat absorbed from microwaves, avoiding the need for extraordinarily long simulations or re-calibration of molecular models.
Original languageEnglish
Pages (from-to)370-390
Number of pages21
JournalMolecular Simulation
Volume42
Issue number5
Early online date22 Jul 2015
DOIs
Publication statusPublished - 23 Mar 2016

Keywords

  • dielectric spectra
  • microwaves
  • molecular dynamics
  • alcohols
  • monoethanolamine

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  • Molecular dynamics investigation of the influence of the hydrogen bond networks in ethanol/water mixtures on dielectric spectra

    Cardona, J., Sweatman, M. B. & Lue, L., 1 Feb 2018, In : Journal of Physical Chemistry B. 122, 4, p. 1505-1515 11 p.

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  • 17 Citations (Scopus)
    59 Downloads (Pure)

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