Fully bio-originated latent heat storing calcium alginate microcapsules with high coconut oil loading

Abstract

Latent heat storing calcium alginate microcapsules were manufactured by a repeated interfacial coacervation/crosslinking method. By using a high-viscosity sodium alginate for the capsule formation, the paraffin phase change material (PCM) content was substantially enhanced related to the recently developed procedure. The maximization of PCM loading was achieved using experimental design for paraffin containing microcapsules. The microcomposites were optimized for 81.5 % PCM content with uniform size of 2.20 ± 0.14 mm. In some applications e.g. packaging, the biodegradable character of the materials is especially beneficial, hence for the manufacture of entirely eco-friendly heat storing microcomposites coconut oil PCM was microencapsulated by the same procedure. The process originally developed and optimized for paraffin was scaled-up by two orders of magnitude, accordingly, the outstanding PCM content was reproduced also with coconut oil (average value 81.1 %). The high PCM content was reflected also in the heat storing capacity measured by differential scanning calorimetry. The easily upscalable, spherical and core/shell structured, entirely biocompatible microcapsules with thermally stable calcium alginate coating could be developed for industrial application.

Antimicrobial functionalization of Ca alginate‐coconut oil latent heat storing microcapsules by Ag nanoparticles

“…18 Recently, entirely eco-friendly microparticles were prepared by a scaled-up procedure using the same shell material, however, encapsulating coconut oil. 19 These fully bio-originated microcapsules possessed high PCM content (81.1% m/m) together with compact shell. Ca alginate is supposed to have antimicrobial effect, however, we experienced that subjecting it to water, our microcapsules were infected by mildew within some weeks.…”

“…In our group a novel method was developed to use Ca alginate to entrap paraffin PCM in order to obtain core‐shell microcapsules with high heat storing capacity 18 . Recently, entirely eco‐friendly microparticles were prepared by a scaled‐up procedure using the same shell material, however, encapsulating coconut oil 19 . These fully bio‐originated microcapsules possessed high PCM content (81.1% m/m) together with compact shell.…”

Edible Oils as Practical Phase Change Materials for Thermal Energy Storage

“…There are no reports assessing margarine and shortening as potential PCMs in terms of their thermal properties and their thermal stabilities, and only a few studies reporting the thermal properties of coconut oil and its application as a PCM for TES [25,26,[29][30][31][32][33][34][35]. The latter showed that coconut oil could be useful for TES in buildings, given that its transition temperature is between 22 and 27 • C [25,26,[30][31][32][33].…”

Synthesis of Antibacterial Gelatin/Sodium Alginate Sponges and Their Antibacterial Activity

“…The third weight loss stage starting from 350 °C to 730 °C is the decomposition of both SA and sodium carbonate [ 24 , 25 ]. The residue of SA is 30.8%, corresponding to the formed carbon dioxide and calcium oxide [ 26 ]. Thermal degradation of gelatin occurs in two stages (curve b in Figure 3 A).…”