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Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites

[Image: see text] Polymer nanocomposites (NCs) offer outstanding potential for dielectric applications including insulation materials. The large interfacial area introduced by the nanoscale fillers plays a major role in improving the dielectric properties of NCs. Therefore, an effort to tailor the p...

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Autores principales: Mahtabani, Amirhossein, La Zara, Damiano, Niittymäki, Minna, Anyszka, Rafał, Rytöluoto, Ilkka, He, Xiaozhen, Saarimäki, Eetta, Seri, Paolo, Saedy, Saeed, Lahti, Kari, Paajanen, Mika, van Ommen, J. Ruud, Dierkes, Wilma, Blume, Anke
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10291639/
https://www.ncbi.nlm.nih.gov/pubmed/37377502
http://dx.doi.org/10.1021/acs.jpcc.3c02732
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author Mahtabani, Amirhossein
La Zara, Damiano
Niittymäki, Minna
Anyszka, Rafał
Rytöluoto, Ilkka
He, Xiaozhen
Saarimäki, Eetta
Seri, Paolo
Saedy, Saeed
Lahti, Kari
Paajanen, Mika
van Ommen, J. Ruud
Dierkes, Wilma
Blume, Anke
author_facet Mahtabani, Amirhossein
La Zara, Damiano
Niittymäki, Minna
Anyszka, Rafał
Rytöluoto, Ilkka
He, Xiaozhen
Saarimäki, Eetta
Seri, Paolo
Saedy, Saeed
Lahti, Kari
Paajanen, Mika
van Ommen, J. Ruud
Dierkes, Wilma
Blume, Anke
author_sort Mahtabani, Amirhossein
collection PubMed
description [Image: see text] Polymer nanocomposites (NCs) offer outstanding potential for dielectric applications including insulation materials. The large interfacial area introduced by the nanoscale fillers plays a major role in improving the dielectric properties of NCs. Therefore, an effort to tailor the properties of these interfaces can lead to substantial improvement of the material’s macroscopic dielectric response. Grafting electrically active functional groups to the surface of nanoparticles (NPs) in a controlled manner can yield reproducible alterations in charge trapping and transport as well as space charge phenomena in nanodielectrics. In the present study, fumed silica NPs are surface modified with polyurea from phenyl diisocyanate (PDIC) and ethylenediamine (ED) via molecular layer deposition (MLD) in a fluidized bed. The modified NPs are then incorporated into a polymer blend based on polypropylene (PP)/ethylene-octene-copolymer (EOC), and their morphological and dielectric properties are investigated. We demonstrate the alterations in the electronic structure of silica upon depositing urea units using density functional theory (DFT) calculations. Subsequently, the effect of urea functionalization on the dielectric properties of NCs is studied using thermally stimulated depolarization current (TSDC) and broadband dielectric spectroscopy (BDS) methods. The DFT calculations reveal the contribution of both shallow and deep traps upon deposition of urea units onto the NPs. It could be concluded that the deposition of polyurea on NPs results in a bi-modal distribution of trap depths that are related to each monomer in the urea units and can lead to a reduction of space charge formation at filler-polymer interfaces. MLD offers a promising tool for tailoring the interfacial interactions in dielectric NCs.
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spelling pubmed-102916392023-06-27 Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites Mahtabani, Amirhossein La Zara, Damiano Niittymäki, Minna Anyszka, Rafał Rytöluoto, Ilkka He, Xiaozhen Saarimäki, Eetta Seri, Paolo Saedy, Saeed Lahti, Kari Paajanen, Mika van Ommen, J. Ruud Dierkes, Wilma Blume, Anke J Phys Chem C Nanomater Interfaces [Image: see text] Polymer nanocomposites (NCs) offer outstanding potential for dielectric applications including insulation materials. The large interfacial area introduced by the nanoscale fillers plays a major role in improving the dielectric properties of NCs. Therefore, an effort to tailor the properties of these interfaces can lead to substantial improvement of the material’s macroscopic dielectric response. Grafting electrically active functional groups to the surface of nanoparticles (NPs) in a controlled manner can yield reproducible alterations in charge trapping and transport as well as space charge phenomena in nanodielectrics. In the present study, fumed silica NPs are surface modified with polyurea from phenyl diisocyanate (PDIC) and ethylenediamine (ED) via molecular layer deposition (MLD) in a fluidized bed. The modified NPs are then incorporated into a polymer blend based on polypropylene (PP)/ethylene-octene-copolymer (EOC), and their morphological and dielectric properties are investigated. We demonstrate the alterations in the electronic structure of silica upon depositing urea units using density functional theory (DFT) calculations. Subsequently, the effect of urea functionalization on the dielectric properties of NCs is studied using thermally stimulated depolarization current (TSDC) and broadband dielectric spectroscopy (BDS) methods. The DFT calculations reveal the contribution of both shallow and deep traps upon deposition of urea units onto the NPs. It could be concluded that the deposition of polyurea on NPs results in a bi-modal distribution of trap depths that are related to each monomer in the urea units and can lead to a reduction of space charge formation at filler-polymer interfaces. MLD offers a promising tool for tailoring the interfacial interactions in dielectric NCs. American Chemical Society 2023-06-09 /pmc/articles/PMC10291639/ /pubmed/37377502 http://dx.doi.org/10.1021/acs.jpcc.3c02732 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Mahtabani, Amirhossein
La Zara, Damiano
Niittymäki, Minna
Anyszka, Rafał
Rytöluoto, Ilkka
He, Xiaozhen
Saarimäki, Eetta
Seri, Paolo
Saedy, Saeed
Lahti, Kari
Paajanen, Mika
van Ommen, J. Ruud
Dierkes, Wilma
Blume, Anke
Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites
title Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites
title_full Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites
title_fullStr Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites
title_full_unstemmed Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites
title_short Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocomposites
title_sort molecular layer deposition of polyurea on silica nanoparticles and its application in dielectric nanocomposites
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10291639/
https://www.ncbi.nlm.nih.gov/pubmed/37377502
http://dx.doi.org/10.1021/acs.jpcc.3c02732
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