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Nucleation of PCMs in confined geometries.

Number: pap. 2

Author(s) : HAGELSTEIN G., GSCHWANDER S.

Summary

This work investigates the influence of particle size on crystallization behaviour of microencapsulated and emulsified n-octadecane using differential scanning calorimetry (DSC) and laser diffraction. Analyses of microcapsules show a stepwise decrease of nucleation temperature (from 26 °C to 14 °C) with decreasing particle size (from 300 µm to 3 µm). Further reduction of particle size in emulsions (< 0.2 µm) results in a slight decrease of nucleation temperature (<2 K). Analyses of cooling thermograms of emulsions show two peaks, a minor peak around 8-9 °C and a major peak, which onset nucleation temperature Tc is influenced substantially by the lipophilic character of the surfactants (Tc varies between 13 °C and 22 °C).
The minor peak is attributed to the transition from rotator to stable crystal phase and its signal increases with decreasing particle size.

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Pages: 8

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Details

  • Original title: Nucleation of PCMs in confined geometries.
  • Record ID : 30017863
  • Languages: English
  • Source: 11th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Karlsruhe, Germany, May 18-20, 2016.
  • Publication date: 2016/05/18
  • DOI: http://dx.doi.org/10.18462/iir.pcm.2016.0002

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