Abstract
MgO and Mg(OH)2 with porous structure were prepared using different types of precipitating agents, including NaOH, KOH, NH3 with paomic acid (PA) and NH3CO3 by hydrothermal method at 200°C for 24 hr. Among the used agents, only NaOH provided single phase MgO powder, after calcination of the precipitate for 2 hr at 400°C. The NH3 with PA system increased the thermal stability of the as-synthesized Mg(OH)2. The synthesized MgO and/or Mg(OH)2 were used to confine blended polyethylene glycol (PEG, MW 1000 and 6000, 1:1 wt.%) and formed a phase change composite where MgO and Mg(OH)2 served as a matrix to accommodate blended PEG. Both MgO and Mg(OH)2 matrix protected the PEG liquid leakage during the phase transition. The SEM analysis of the composite revealed that considerable amount of PEG was occupying within the pores, well-dispersed on the surfaces of the magnesium oxide porous structure which stabilized by capillary forces and the surface tension. The results of the differential scanning calorimetry demonstrated that the transition freezing temperature of the composite was 28.50°C, while the melting point was 58.10°C in the case of Mg(OH)2 matrix. The latent heat of melting was 165 J/g, which is greatly higher than those with the commonly available materials. This property indicates that the synthesized MgO and Mg(OH)2 composite is a promising material for solar applications including, storing energy with good thermal stability.
Original language | English |
---|---|
Title of host publication | 28th Annual Saudi-Japan Symposium on Technology in Petroleum Refining and Petrochemicals 2018 |
Publisher | King Fahd University of Petroleum and Minerals |
Pages | 64-68 |
Number of pages | 5 |
ISBN (Electronic) | 9781510877436 |
State | Published - 2018 |
Publication series
Name | King Fahd University of Petroleum and Minerals, Research Institute - Annual Catalysts in Petroleum Refining and Petrochemicals Symposium Papers |
---|---|
Volume | 2018-November |
Bibliographical note
Funding Information:Acknowledgement: The authors would like to acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum & Minerals (KFUPM) by funding this work through project No. IN-171036.
Funding Information:
The authors would like to acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum & Minerals (KFUPM) by funding this work through project No. IN-171036.
ASJC Scopus subject areas
- Catalysis
- Energy Engineering and Power Technology
- Fuel Technology
- General Chemistry