Ab initio modelling of interfaces in nanocomposites for high voltage insulation

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Search: WFRF:(Unge Mikael) > Ab initio modelling...

Details
MARC

Kubyshkina, Elena,1990-KTH,Elektroteknisk teori och konstruktion (author)

Ab initio modelling of interfaces in nanocomposites for high voltage insulation

BookEnglish2018

Publisher, publication year, extent ...

KTH Royal Institute of Technology,2018
67 s.
electronicrdacarrier

Numbers

LIBRIS-ID:oai:DiVA.org:kth-225964
ISBN:9789177297437
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-225964URI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

Classification

Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

Notes

QC 20180413
Dielectric nanocomposite materials have been experimentally proven to have properties that are beneficial in applications for efficient energy transport. However, today there are still no empirical models or rules that can predict the performance of a certain combination of materials in the nanocomposite, and there are also no definitive explanations of their dielectric behavior. A deeper understanding of the phenomena behind these materials' response to an applied electric field can open new possibilities for improvement of the insulating properties of nanocomposites.The goal of this work is to locate the key processes that are responsible for dielectric performance. The methodology of the study is based on ab initio technology, that relies solely on the knowledge of chemical and structural composition of the material. In this work, the charge-related properties of nanocomposite interfaces are studied. The primary material of the study is chosen to be polyethylene-based composite with magnesium oxide nanoparticles.The impact of the nanoparticle crystal surface termination and its silane treatment on the electronic structure of the interface between MgO and polyethylene are investigated here. Moreover, the effects of presence of carboxyl defect and water molecule near the interface are considered in this work as well.Based on the calculated electronic structure data, a model for charge dynamics is proposed. The model explains mechanisms for conductivity and space charge reduction in nanocomposites, but also predicts an increase in thermal stress and susceptibility for chemical defects. It is suggested here that the suppression mechanisms for space charge and conductivity in nanocomposites are inherently unstable and can also accelerate material aging.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

Jonsson, B. Lars G.,ProfessorKTH,Elektroteknisk teori och konstruktion(Swepub:kth)u12ind03 (thesis advisor)
Unge, Mikael,Assistant Professor (Affiliated faculty)KTH,Polymera material,ABB Corporate Research (thesis advisor)
Åstrand, Per-Olof,ProfessorNorwegian University of Science and Technology (opponent)
KTHElektroteknisk teori och konstruktion (creator_code:org_t)

Internet link

Find in a library

Ab initio modelling of interfaces in nanocomposites for high voltage insulation (Search the publication in LIBRIS)

To the university's database

Find more in SwePub

By the author/editor: Kubyshkina, Elen ...; Jonsson, B. Lars ...; Unge, Mikael, As ...; Åstrand, Per-Olo ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...

By the university: Royal Institute of Technology

Search outside SwePub

Extend your search to:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se