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

Cardona, Javier and Fartaria, Rui and Sweatman, Martin B. and Lue, Leo (2016) Molecular dynamics simulations for the prediction of the dielectric spectra of alcohols, glycols, and monoethanolamine. Molecular Simulation, 42 (5). pp. 370-390. ISSN 1029-0435 (https://doi.org/10.1080/08927022.2015.1055741)

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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.

  • Item type:Article
    ID code:54062
    Dates:
    Date
    Event
    23 March 2016
    Published
    22 July 2015
    Published Online
    21 May 2015
    Accepted
    Notes:This is an Accepted Manuscript of an article published by Taylor & Francis in Molecular Simulation on 23.03.2016, available online: http://wwww.tandfonline.com/10.1080/08927022.2015.1055741.
    Subjects:Technology > Chemical engineering
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:25 Aug 2015 10:37
    Last modified:18 Apr 2024 04:12
    URI:https://strathprints.strath.ac.uk/id/eprint/54062
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