Topic Editors

Dr. Natália T. Correia
Unité Matériaux et Transformations, CNRS, UMR 8207, UMET, Université de Lille, F59000 Villeneuve d’Ascq, France
Dr. Teresa Viciosa
Instituto Superior Técnico, Lisbon, Portugal
Dr. Hermínio P. Diogo
Centro de Quimica Estrutural, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal

Broadband Dielectric Spectroscopy Fundamentals and Applications

Abstract submission deadline
closed (31 January 2025)
Manuscript submission deadline
30 April 2025
Viewed by
2108

Topic Information

Dear Colleagues,

We are pleased to inform you that a Topic entitled “Broadband Dielectric Spectroscopy Fundamentals and Applications” is currently underway, inspired by the forthcoming 12th edition of the Conference on Broadband Dielectric Spectroscopy and Its Applications, BDS 2024 Lisbon. Broadband Dielectric Spectroscopy (BDS) is a powerful experimental technique allowing the investigation of the molecular dynamics of materials that respond to an outer oscillating electrical field. Nowadays, combined methods and equipment covering up to 16 decades of frequency allow us to explore a panoply of time scales going from short-range and very local processes to long-range cooperative processes, activated under a set of predefined temperatures (and pressures). Besides molecular dynamics, charge transport and interfacial phenomena in heterogeneous disordered systems, in addition to confinement and non-linear effects, are also able to be characterized. Moreover, time-dependent events can be dielectrically monitored as chemical reactions, molecular interconversion, phase transformations and physical ageing. BDS has been applied in different fields of science and technology from pharmaceutics and biology to energy and the environment. Therefore, a variety of materials can be investigated by BDS, like molecular and macromolecular compounds, plastic crystals, ionic liquids, liquid crystals, eutectic systems and newly emerging functional materials, as self-healing/recyclable dynamic networks. Given its multidisciplinary approach and extensive range of applications, this Topic will be greatly enriched by new themes and contributions from authors outside the dielectric community whose fundamental and/or applied research adds new synergies at both experimental and theoretical levels. The Topic may include, but is not limited to, the following themes that fit the scope of the participating MDPI journals:

  • Polymer dynamics;
  • Soft matter dynamics and phase transitions in amorphous, partially ordered and ordered systems;
  • Impact of external variables in dielectric properties;
  • Water, hydrogen bonded and biological systems;
  • Charge transport and interfacial effects;
  • Monitoring of chemical reactions, crystallization process and physical ageing;
  • Ferroelectrics and ceramics;
  • BDS in relation to other spectroscopic or scattering techniques;
  • Confinement effects;
  • Modeling, theory and molecular dynamics simulation.

We hope to attract papers providing different perspectives on this transversal subject and we look forward to receiving your contributions.

Dr. Natália T. Correia
Dr. Teresa Viciosa
Dr. Hermínio Diogo
Topic Editors

Keywords

  • molecular dynamics
  • interfacial phenomena
  • non-linear effects
  • chemical reactions
  • charge transport
  • confinement
  • phase transformations
  • liquid crystals
  • ionic liquids
  • physical aging
  • plastic crystals
  • molecules

Participating Journals

Journal Name Impact Factor CiteScore Launched Year First Decision (median) APC
Applied Sciences
applsci
2.5 5.3 2011 18.4 Days CHF 2400 Submit
Ceramics
ceramics
2.7 3.0 2018 20.7 Days CHF 1600 Submit
Crystals
crystals
2.4 4.2 2011 11.1 Days CHF 2100 Submit
Membranes
membranes
3.3 6.1 2011 14.9 Days CHF 2200 Submit
Nanomaterials
nanomaterials
4.4 8.5 2010 14.1 Days CHF 2400 Submit
Polymers
polymers
4.7 8.0 2009 14.5 Days CHF 2700 Submit

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Published Papers (1 paper)

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19 pages, 2384 KiB  
Article
Exploring the Relationship Between Stability and Dynamics in Polymer-Based Amorphous Solid Dispersions for Pharmaceutical Applications
by Emeline Dudognon, Jeanne-Annick Bama and Frédéric Affouard
Polymers 2025, 17(9), 1210; https://doi.org/10.3390/polym17091210 (registering DOI) - 28 Apr 2025
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Abstract
Mixing polymeric excipients with drugs in amorphous solid dispersions (ASD) is known to enhance the bioavailability of drugs by inhibiting their recrystallisation. However, the mechanisms underlying stabilisation remain not fully understood. This study aims to improve our understanding of the role of dynamics, [...] Read more.
Mixing polymeric excipients with drugs in amorphous solid dispersions (ASD) is known to enhance the bioavailability of drugs by inhibiting their recrystallisation. However, the mechanisms underlying stabilisation remain not fully understood. This study aims to improve our understanding of the role of dynamics, particularly the molecular movements that drive instabilities, through investigations of ASD made of Polyvinylpyrrolidone (PVP K12) and a model drug, Terfenadine. The analyses combine temperature modulated differential scanning calorimetry (MDSC) and dielectric relaxation spectroscopy. The results reveal that the produced ASDs are supersaturated with Terfenadine, regardless of the content, and that PVP slows down the dynamics of the blends, limiting the recrystallisation of the drug during heating. Although the ASDs appear homogeneous based on thermal analysis with a single glass transition consistently detected by MDSC, the investigation of the dynamics reveals a dissociation of the main relaxation into two components for PVP contents below 30 wt.%. This dynamic heterogeneity suggests a structural heterogeneity with the coexistence of two amorphous phases of different compositions, each characterised by its own dynamics. The complex evolution of these dynamics under recrystallisation is rationalised by the confrontation with the phase and state diagram of Terfenadine/PVP blends established by MDSC. Full article
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