Microencapsulation of Stearic Acid into Strontium Titanate Shell by Sol‐Gel Approach for Thermal Energy Storage

Abstract

Microencapsulation of phase change material (PCM), stearic acid (SA) into strontium titanate (SrTiO3) shell was generated by means of sol‐gel approach using strontium nitrate and titanium tetraisopropoxide as precursors. The influence of core‐to‐shell ratio (stearic acid‐to‐strontium nitrate) was investigated on encapsulation ratio, stability and encapsulation efficiency in detail. It turned out that a maximum encapsulation efficiency of 41% and encapsulation ratio of 39% were resulted for the (1:2) ratio microencapsulated PCM. The TGA data confirmed that the fabricated MEPCMs degraded in two steps with less weight loss (78%) compared to pristine SA (99.76%). The cycling stability test recorded after 500 melting/solidification cycles revealed that the developed microcapsules retained excellent thermal stability. Detailed preparation of MEPCM and its analytical as well as thermal characterizations are presented.

Preparation and characterization of novel CuS / SiO 2 @n‐octadecane phase‐change nanocapsules enhanced photothermal conversion for solar energy utilization

“…However, the large volume variation, low thermal conductivity, and slow thermal response speed limit their stable application. 7 Microcapsule encapsulation technology, as the most studied encapsulation technology at present, can restrain PCMs to a small space and separate them from the outside environment, effectively solving the volume change and leakage problems in the phase transition process. 8,9 The synthesis of polyurethane, 10 polymethyl methacrylate, 11 urea-formaldehyde resin, 12 TiO 2, 13 SiO 2, 14 Al(OH) 3 , 15 and other shell materials has been widely reported.…”

“…PCMs can be used for high‐density energy storage at an approximately constant temperature. However, the large volume variation, low thermal conductivity, and slow thermal response speed limit their stable application 7 . Microcapsule encapsulation technology, as the most studied encapsulation technology at present, can restrain PCMs to a small space and separate them from the outside environment, effectively solving the volume change and leakage problems in the phase transition process 8,9 .…”

Prediction of Thermal Properties and Reliability Testing of Binary Eutectic Mixture of Polyethylene Glycol 2000 and 10000 as Phase Change Materials

“…Although, storage of sensible form of heat is important in many industrial applications and preferred but latent heat has more advantages due to the fact they are able to store higher energy as compared to sensible heat systems. [1][2] The systems that use phase change material (PCM) as energy storage medium are referred to latent heat thermal energy storage (LHTES) systems. They are capable of storing energy during phase change process and can release when it is needed in application.…”