Thermal performance enhancement of a phase change material with expanded graphite via ultrasonication

Jisoo Jeon, Ji Hun Park, Seunghwan Wi, Ki Hyun Kim, Sumin Kim

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


It is desirable to improve the performance of phase change materials (PCM)-based thermal energy storage (TES) systems because it increases energy efficiency while decreasing primary energy consumption for low environmental loading. Given that PCM suffers from low thermal conductivity (e.g., due to high latent heat capacity and low phase separation), we investigated several efficient options to improve the thermal conductivity of organic PCM (n-octadecane) based on the addition of (0.1 wt%) expanded graphite (EG). The suspension prepared via ultrasonication led to an improvement of 40% in thermal conductivity corresponding to 0.28 W/m when compared to that of n-octadecane corresponding to 0.20 W/mK. Additionally, the ultrasonication effectively dispersed EG in the PCM for an extended duration relative to the stirring method. A PCM-EG reaction was not evident under ultrasonication conditions. Thus, the thermal conductivity of the PCM exhibited maximum improvement when the two conditions involving extremely low amount of EG and its stable dispersion under sonication condition were maintained. The study demonstrated that a significant improvement in thermal conductivity is obtained with a very low amount of EG and that dispersion stability is obtained even with short ultrasonication times.

Original languageEnglish
Pages (from-to)437-442
Number of pages6
JournalJournal of Industrial and Engineering Chemistry
Publication statusPublished - 2019 Nov 25

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT & Future Planning ( 2016R1A1A1A05921937 ). The study was supported by the Yonsei University Research Fund of 2018 ( 2018-22-0193 ).

Publisher Copyright:
© 2019 The Korean Society of Industrial and Engineering Chemistry

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)


Dive into the research topics of 'Thermal performance enhancement of a phase change material with expanded graphite via ultrasonication'. Together they form a unique fingerprint.

Cite this