A Novel Encapsulation Method for Phase Change Materials with a AgBr Shell as a Thermal Energy Storage Material

Abstract

Micro/nanoencapsulated phase change materials, used typically as energy storage materials, are frequently applied in energy-saving and energy-efficient processes. In this work, we proposed a novel method for the micro/nanoencapsulation of phase change materials (PCMs), which has the advantage of simple operation and can be suitable for encapsulation of more than one PCM. Fatty acid PCMs, such as steric acid and palmitic acid, and non-fatty acid PCMs, like beeswax, have both been successfully micro/nanoencapsulated by a silver bromide (AgBr) shell with this method. The obtained fatty acid/AgBr micro/nanocapsules, with diameters of less than 1 µm, show good thermal storage capacities over 150 J/g with their encapsulation ratios as high as 92.4%. Similarly, the prepared beeswax/AgBr micro/nanocapsules show a high encapsulation ratio. In addition, all the micro/nanocapsules exhibit good thermal stability. Therefore, the method developed by this work is highly-efficient for the encapsulation of PCMs, which is beneficial for PCMs in various applications as energy storage materials.

Thermal properties and behavior of microencapsulated sugarcane wax phase change material

“…The encapsulation ratio (ER) of EPCM, the effective encapsulation of core materials incorporated into the microcapsules, was 87.6% which is slightly higher than highest ER of 85% obtained from the microcapsules consisting of organic phase change as core material and polymethylmethacrylate as the shell (Han et al., 2017). The encapsulation efficiency (EE) of EPCM, the effective encapsulation of core materials incorporated into the microcapsules, was 85.4% which is comparable to the highest encapsulated beeswax/AgBr micro/nanocapsules of 83% (Yuan et al., 2019). The complete encapsulation of sugarcane wax/nano-Al 2 O 3 into PCM microcapsules can be confirmed by DSC measurement of endothermic peak (61 °C) appeared near temperature of phase change of the core material (60.83 °C).…”

Bifunctional Paraffin@CaCO3:Ce3+ Phase Change Microcapsules for Thermal Energy Storage and Photoluminescence

“…The obtained microcapsules have a spherical shape with an average particle diameter of 200−400 nm, and the paraffin wax is preferably encapsulated in the TiO 2 shell. Yuan et al 22 proposed a new method for encapsulating phase change materials using silver bromide(AgBr) as a shell. Micro/nano capsules with a diameter of less than 1 μm and encapsulation efficiency of up to 92.4% were obtained by this method.…”

Construction strategies and thermal energy storage applications of shape‐stabilized phase change materials

“…45,46 In this way, the specific heat transfer area is greatly extended and the heat conduction speed exhibits a significant rise. 47 There are three strategies to encapsulate PCMs including physical methods, such as spray drying technology, 48,49 chemical methods, such as emulsion polymerization, [50][51][52] interfacial polymerization, [53][54][55] in-situ polymerization [56][57][58][59] and self-assembly, [60][61][62][63] and physicochemical methods, such as complex aggregation method 64,65 and sol-gel method. 48,[66][67][68][69] For achieving highly efficient TES of MEPCMs, their shell materials should include the following characteristics 70 :…”