Cargando…
Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees
We prepared poly(ethylaniline)-coated graphene oxide nanoflakes and then treated them with different concentrations of hydrazine solution to form dielectric composite nanoflakes having different reduction degrees of reduced graphene oxide core and insulating polyethylaniline shell (PEANI/rGO). The m...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7692228/ https://www.ncbi.nlm.nih.gov/pubmed/33138140 http://dx.doi.org/10.3390/polym12112528 |
_version_ | 1783614463429050368 |
---|---|
author | Wang, Yudong Yang, Min Chen, Honggang Zhao, Xiaopeng Yin, Jianbo |
author_facet | Wang, Yudong Yang, Min Chen, Honggang Zhao, Xiaopeng Yin, Jianbo |
author_sort | Wang, Yudong |
collection | PubMed |
description | We prepared poly(ethylaniline)-coated graphene oxide nanoflakes and then treated them with different concentrations of hydrazine solution to form dielectric composite nanoflakes having different reduction degrees of reduced graphene oxide core and insulating polyethylaniline shell (PEANI/rGO). The morphology of PEANI/rGO was observed by scanning electron microscopy, while the chemical structure was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectrometer. The influence of reduction degrees on the conductivity, dielectric polarization and electrorheological effect of PEANI/rGO in suspensions was investigated by dielectric spectroscopy and rheological test under electric fields. It shows that the PEANI/rGO has two interfacial polarization processes respectively due to rGO core and PEANI shell. As the number of hydrazine increases, the conductivity and polarization rate of rGO core increase. As a result, the difference between the polarization rate of rGO core and that of the PEANI shell gradually becomes large. This increased difference does not significantly decrease the yield stress but causes the flow instability of PEANI/GO suspensions under the simultaneous action of electric and shear fields. |
format | Online Article Text |
id | pubmed-7692228 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-76922282020-11-28 Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees Wang, Yudong Yang, Min Chen, Honggang Zhao, Xiaopeng Yin, Jianbo Polymers (Basel) Article We prepared poly(ethylaniline)-coated graphene oxide nanoflakes and then treated them with different concentrations of hydrazine solution to form dielectric composite nanoflakes having different reduction degrees of reduced graphene oxide core and insulating polyethylaniline shell (PEANI/rGO). The morphology of PEANI/rGO was observed by scanning electron microscopy, while the chemical structure was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectrometer. The influence of reduction degrees on the conductivity, dielectric polarization and electrorheological effect of PEANI/rGO in suspensions was investigated by dielectric spectroscopy and rheological test under electric fields. It shows that the PEANI/rGO has two interfacial polarization processes respectively due to rGO core and PEANI shell. As the number of hydrazine increases, the conductivity and polarization rate of rGO core increase. As a result, the difference between the polarization rate of rGO core and that of the PEANI shell gradually becomes large. This increased difference does not significantly decrease the yield stress but causes the flow instability of PEANI/GO suspensions under the simultaneous action of electric and shear fields. MDPI 2020-10-29 /pmc/articles/PMC7692228/ /pubmed/33138140 http://dx.doi.org/10.3390/polym12112528 Text en © 2020 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 Wang, Yudong Yang, Min Chen, Honggang Zhao, Xiaopeng Yin, Jianbo Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees |
title | Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees |
title_full | Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees |
title_fullStr | Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees |
title_full_unstemmed | Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees |
title_short | Dielectric Polarization and Electrorheological Response of Poly(ethylaniline)-Coated Reduced Graphene Oxide Nanoflakes with Different Reduction Degrees |
title_sort | dielectric polarization and electrorheological response of poly(ethylaniline)-coated reduced graphene oxide nanoflakes with different reduction degrees |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7692228/ https://www.ncbi.nlm.nih.gov/pubmed/33138140 http://dx.doi.org/10.3390/polym12112528 |
work_keys_str_mv | AT wangyudong dielectricpolarizationandelectrorheologicalresponseofpolyethylanilinecoatedreducedgrapheneoxidenanoflakeswithdifferentreductiondegrees AT yangmin dielectricpolarizationandelectrorheologicalresponseofpolyethylanilinecoatedreducedgrapheneoxidenanoflakeswithdifferentreductiondegrees AT chenhonggang dielectricpolarizationandelectrorheologicalresponseofpolyethylanilinecoatedreducedgrapheneoxidenanoflakeswithdifferentreductiondegrees AT zhaoxiaopeng dielectricpolarizationandelectrorheologicalresponseofpolyethylanilinecoatedreducedgrapheneoxidenanoflakeswithdifferentreductiondegrees AT yinjianbo dielectricpolarizationandelectrorheologicalresponseofpolyethylanilinecoatedreducedgrapheneoxidenanoflakeswithdifferentreductiondegrees |