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  • Pallon, Love K. H.KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH) (author)

Formation and the structure of freeze-dried MgO nanoparticle foams and their electrical behaviour in polyethylene

  • Article/chapterEnglish2015

Publisher, publication year, extent ...

  • 2015
  • Royal Society of Chemistry (RSC),2015
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-165239
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-165239URI
  • https://doi.org/10.1039/c4ta06362gDOI
  • https://research.chalmers.se/publication/218169URI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20150505
  • Electrically insulating low-density polyethylene (LDPE) nanocomposites based on dispersed MgO nanoparticle foams are reported. The foams were obtained via freeze-drying aqueous suspensions of precipitated ca. 40 nm wide and 10 nm thick Mg(OH)(2) nanoparticles and dewatering (calcining) at 400 degrees C, resulting in a 25 times more voluminous powder compared to conventionally dried nanoparticles. This powder handling prior to extrusion melt-processing greatly facilitated the nanocomposite preparation since no particle grinding was necessary. Large quantities of particles were prepared (>5 g), and the nanoparticle foams showed improved dispersion in the LDPE matrix with 70% smaller aggregate sizes compared to the conventionally dried and ground nanopowders. The nature of the nanoparticle foams was evaluated in terms of their dispersion on Si-wafers using ultrasonication as a dispersing aid, which showed to be detrimental for the nanoparticle separation into solitary particles and induced severe aggregation of the calcined nanoparticles. The grind-free MgO nanoparticles/LDPE-composite was evaluated by electrical measurement. The prepared composite showed an initial ca. 1.5 orders of magnitude lower charging current at 10(2) s, and a 4.2 times lower charging current after 16 hours compared to unfilled LDPE. The results open a way for improved insulation to be implemented in the future high-voltage cable system and present a new promising nanoparticle powder handling technique that can be used on a large scale.

Subject headings and genre

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

  • Olsson, Richard T.KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1ob386f (author)
  • Liu, Dongming,1987-KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1d77137 (author)
  • Pourrahimi, Amir MasoudKTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1a3g182 (author)
  • Hedenqvist, Mikael S.KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u10rkaxe (author)
  • Hoang, Tuan Anh,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tuanan (author)
  • Gubanski, Stanislaw,1950Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)staszek (author)
  • Gedde, Ulf W.KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)(Swepub:kth)u1j56evm (author)
  • KTHFiber- och polymerteknologi (creator_code:org_t)

Related titles

  • In:Journal of Materials Chemistry A: Royal Society of Chemistry (RSC)3:14, s. 7523-75342050-74882050-7496

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