Cargando…

Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites

Epoxy nanocomposites reinforced with various grades of multilayer graphene nanoplatelets (GNPs) are manufactured and tested. The effects of size, surface area, and concentration of GNP, as well as alternating current (AC) frequency on the electrical and dielectric properties of epoxy nanocomposites...

Descripción completa

Detalles Bibliográficos
Autores principales: Ravindran, Anil Raj, Feng, Chuang, Huang, Shu, Wang, Yu, Zhao, Zhan, Yang, Jie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415418/
https://www.ncbi.nlm.nih.gov/pubmed/30966511
http://dx.doi.org/10.3390/polym10050477
_version_ 1783403183101444096
author Ravindran, Anil Raj
Feng, Chuang
Huang, Shu
Wang, Yu
Zhao, Zhan
Yang, Jie
author_facet Ravindran, Anil Raj
Feng, Chuang
Huang, Shu
Wang, Yu
Zhao, Zhan
Yang, Jie
author_sort Ravindran, Anil Raj
collection PubMed
description Epoxy nanocomposites reinforced with various grades of multilayer graphene nanoplatelets (GNPs) are manufactured and tested. The effects of size, surface area, and concentration of GNP, as well as alternating current (AC) frequency on the electrical and dielectric properties of epoxy nanocomposites are experimentally investigated. GNPs with larger size and surface area are always beneficial to increase the electrical conductivity of the composites. However, their effects on the dielectric constant are highly dependent on GNP concentration and AC frequency. At lower GNP concentration, the dielectric constant increases proportionally with the increase in GNP size, while decreasing as the AC frequency increases. At higher GNP concentration in epoxy, the dielectric constant first increases with the increase of the GNP size, but decreases thereafter. This trend is also observed for varying the processed GNP surface area on the dielectric constant. Moreover, the variations of the electrical conductivity and dielectric constant with the GNP concentration and AC frequency are then correlated with the measured interfiller spacing and GNP diameter.
format Online
Article
Text
id pubmed-6415418
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-64154182019-04-02 Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites Ravindran, Anil Raj Feng, Chuang Huang, Shu Wang, Yu Zhao, Zhan Yang, Jie Polymers (Basel) Article Epoxy nanocomposites reinforced with various grades of multilayer graphene nanoplatelets (GNPs) are manufactured and tested. The effects of size, surface area, and concentration of GNP, as well as alternating current (AC) frequency on the electrical and dielectric properties of epoxy nanocomposites are experimentally investigated. GNPs with larger size and surface area are always beneficial to increase the electrical conductivity of the composites. However, their effects on the dielectric constant are highly dependent on GNP concentration and AC frequency. At lower GNP concentration, the dielectric constant increases proportionally with the increase in GNP size, while decreasing as the AC frequency increases. At higher GNP concentration in epoxy, the dielectric constant first increases with the increase of the GNP size, but decreases thereafter. This trend is also observed for varying the processed GNP surface area on the dielectric constant. Moreover, the variations of the electrical conductivity and dielectric constant with the GNP concentration and AC frequency are then correlated with the measured interfiller spacing and GNP diameter. MDPI 2018-04-27 /pmc/articles/PMC6415418/ /pubmed/30966511 http://dx.doi.org/10.3390/polym10050477 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ravindran, Anil Raj
Feng, Chuang
Huang, Shu
Wang, Yu
Zhao, Zhan
Yang, Jie
Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites
title Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites
title_full Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites
title_fullStr Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites
title_full_unstemmed Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites
title_short Effects of Graphene Nanoplatelet Size and Surface Area on the AC Electrical Conductivity and Dielectric Constant of Epoxy Nanocomposites
title_sort effects of graphene nanoplatelet size and surface area on the ac electrical conductivity and dielectric constant of epoxy nanocomposites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415418/
https://www.ncbi.nlm.nih.gov/pubmed/30966511
http://dx.doi.org/10.3390/polym10050477
work_keys_str_mv AT ravindrananilraj effectsofgraphenenanoplateletsizeandsurfaceareaontheacelectricalconductivityanddielectricconstantofepoxynanocomposites
AT fengchuang effectsofgraphenenanoplateletsizeandsurfaceareaontheacelectricalconductivityanddielectricconstantofepoxynanocomposites
AT huangshu effectsofgraphenenanoplateletsizeandsurfaceareaontheacelectricalconductivityanddielectricconstantofepoxynanocomposites
AT wangyu effectsofgraphenenanoplateletsizeandsurfaceareaontheacelectricalconductivityanddielectricconstantofepoxynanocomposites
AT zhaozhan effectsofgraphenenanoplateletsizeandsurfaceareaontheacelectricalconductivityanddielectricconstantofepoxynanocomposites
AT yangjie effectsofgraphenenanoplateletsizeandsurfaceareaontheacelectricalconductivityanddielectricconstantofepoxynanocomposites