Freeze-casting to create create directional micro-channels in regenerators for magnetic refrigeration

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Abstract

We present the engineering of directional porosity in the form of lamellar micro-channels in the magnetocaloric ceramic of La0.66Ca0.27Sr0.06Mn1.05O3 (LCSM) by freeze-casting. Freeze-casting is a templating technique based on the anisotropic growth of ice crystals in aqueous suspensions upon directional freezing, which, when applied to a suspension of LCSM results in hierarchical structures of aligned porosity in the form of micro-channels with widths of 5 μm to 20 μm. Channel sizes and tortuosity are measured and calculated from analysis of SEM images obtained at cross sections perpendicular and parallel to the freezing direction, respectively, while freezing conditions are monitored by temperature measurements. We propose that freeze-casting demonstrate apparent applicability within processing of ceramic materials for application as regenerator for magnetic refrigeration.
Original languageEnglish
Title of host publication8th International Conference on Caloric Cooling (Thermag VIII)
PublisherInternational Institute of Refrigeration
Publication date2018
Pages96-101
ISBN (Electronic)9782362150289
Publication statusPublished - 2018
EventThermag VIII - International Conference on Caloric Cooling (2018) - Darmstadt, Germany
Duration: 16 Sep 201820 Sep 2018
http://thermag2018.de/frontend/index.php?folder_id=783

Conference

ConferenceThermag VIII - International Conference on Caloric Cooling (2018)
CountryGermany
CityDarmstadt
Period16/09/201820/09/2018
Internet address
SeriesInstitut International du Froid. Bulletin
ISSN0020-6970

Keywords

  • Freeze-casting
  • Ice templating
  • Micro-channels
  • Porous ceramics
  • Magnetocaloric
  • Magnetic refrigeration
  • Active magnetic regenerator

Cite this

Christiansen, C. D., Nielsen, K. K., & Bjørk, R. (2018). Freeze-casting to create create directional micro-channels in regenerators for magnetic refrigeration. In 8th International Conference on Caloric Cooling (Thermag VIII) (pp. 96-101). International Institute of Refrigeration. Institut International du Froid. Bulletin
Christiansen, Cathrine Deichmann ; Nielsen, Kaspar Kirstein ; Bjørk, Rasmus. / Freeze-casting to create create directional micro-channels in regenerators for magnetic refrigeration. 8th International Conference on Caloric Cooling (Thermag VIII). International Institute of Refrigeration, 2018. pp. 96-101 (Institut International du Froid. Bulletin).
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abstract = "We present the engineering of directional porosity in the form of lamellar micro-channels in the magnetocaloric ceramic of La0.66Ca0.27Sr0.06Mn1.05O3 (LCSM) by freeze-casting. Freeze-casting is a templating technique based on the anisotropic growth of ice crystals in aqueous suspensions upon directional freezing, which, when applied to a suspension of LCSM results in hierarchical structures of aligned porosity in the form of micro-channels with widths of 5 μm to 20 μm. Channel sizes and tortuosity are measured and calculated from analysis of SEM images obtained at cross sections perpendicular and parallel to the freezing direction, respectively, while freezing conditions are monitored by temperature measurements. We propose that freeze-casting demonstrate apparent applicability within processing of ceramic materials for application as regenerator for magnetic refrigeration.",
keywords = "Freeze-casting, Ice templating, Micro-channels, Porous ceramics, Magnetocaloric, Magnetic refrigeration, Active magnetic regenerator",
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Christiansen, CD, Nielsen, KK & Bjørk, R 2018, Freeze-casting to create create directional micro-channels in regenerators for magnetic refrigeration. in 8th International Conference on Caloric Cooling (Thermag VIII). International Institute of Refrigeration, Institut International du Froid. Bulletin, pp. 96-101, Thermag VIII - International Conference on Caloric Cooling (2018), Darmstadt, Germany, 16/09/2018.

Freeze-casting to create create directional micro-channels in regenerators for magnetic refrigeration. / Christiansen, Cathrine Deichmann; Nielsen, Kaspar Kirstein; Bjørk, Rasmus.

8th International Conference on Caloric Cooling (Thermag VIII). International Institute of Refrigeration, 2018. p. 96-101 (Institut International du Froid. Bulletin).

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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N2 - We present the engineering of directional porosity in the form of lamellar micro-channels in the magnetocaloric ceramic of La0.66Ca0.27Sr0.06Mn1.05O3 (LCSM) by freeze-casting. Freeze-casting is a templating technique based on the anisotropic growth of ice crystals in aqueous suspensions upon directional freezing, which, when applied to a suspension of LCSM results in hierarchical structures of aligned porosity in the form of micro-channels with widths of 5 μm to 20 μm. Channel sizes and tortuosity are measured and calculated from analysis of SEM images obtained at cross sections perpendicular and parallel to the freezing direction, respectively, while freezing conditions are monitored by temperature measurements. We propose that freeze-casting demonstrate apparent applicability within processing of ceramic materials for application as regenerator for magnetic refrigeration.

AB - We present the engineering of directional porosity in the form of lamellar micro-channels in the magnetocaloric ceramic of La0.66Ca0.27Sr0.06Mn1.05O3 (LCSM) by freeze-casting. Freeze-casting is a templating technique based on the anisotropic growth of ice crystals in aqueous suspensions upon directional freezing, which, when applied to a suspension of LCSM results in hierarchical structures of aligned porosity in the form of micro-channels with widths of 5 μm to 20 μm. Channel sizes and tortuosity are measured and calculated from analysis of SEM images obtained at cross sections perpendicular and parallel to the freezing direction, respectively, while freezing conditions are monitored by temperature measurements. We propose that freeze-casting demonstrate apparent applicability within processing of ceramic materials for application as regenerator for magnetic refrigeration.

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KW - Ice templating

KW - Micro-channels

KW - Porous ceramics

KW - Magnetocaloric

KW - Magnetic refrigeration

KW - Active magnetic regenerator

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BT - 8th International Conference on Caloric Cooling (Thermag VIII)

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Christiansen CD, Nielsen KK, Bjørk R. Freeze-casting to create create directional micro-channels in regenerators for magnetic refrigeration. In 8th International Conference on Caloric Cooling (Thermag VIII). International Institute of Refrigeration. 2018. p. 96-101. (Institut International du Froid. Bulletin).