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Formation and the s...
Formation and the structure of freeze-dried MgO nanoparticle foams and their electrical behaviour in polyethylene
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- Pallon, Love K. H. (author)
- KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Olsson, Richard T. (author)
- KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Liu, Dongming, 1987- (author)
- KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Pourrahimi, Amir Masoud (author)
- KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Hedenqvist, Mikael S. (author)
- KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Hoang, Tuan Anh, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gubanski, Stanislaw, 1950 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gedde, Ulf W. (author)
- KTH,Fiber- och polymerteknologi,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 3:14, s. 7523-7534
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Abstract
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- 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
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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Pallon, Love K. ...
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Olsson, Richard ...
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Liu, Dongming, 1 ...
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Pourrahimi, Amir ...
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Hedenqvist, Mika ...
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Hoang, Tuan Anh, ...
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show more...
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Gubanski, Stanis ...
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Gedde, Ulf W.
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- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Chemical Enginee ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Electrical Engin ...
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Journal of Mater ...
- By the university
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Royal Institute of Technology
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Chalmers University of Technology