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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Coating approach for a Phase Change Material (PCM)

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Paulo, Bruna Barbon [1] ; Andreola, Kaciane [2] ; Taranto, Osvaldir [2] ; Ferreira, Almerindo D. [3] ; Prata, Ana Silvia [1]
Total Authors: 5
[1] Univ Campinas UNICAMP, Sch Food Engn, Dept Food Engn, 80 Monteiro Lobato St, BR-13083862 Campinas, SP - Brazil
[2] Univ Campinas UNICAMP, Sch Chem Engn, Dept Proc Engn, 500 Albert Einstein Ave, BR-13083852 Campinas, SP - Brazil
[3] Univ Coimbra, Dept Mech Engn, Polo 2, P-3030788 Coimbra - Portugal
Total Affiliations: 3
Document type: Journal article
Source: Powder Technology; v. 341, n. SI, p. 147-156, JAN 1 2019.
Web of Science Citations: 4

PCMs (Phase Change Materials) go through volumetric variation during the solid-liquid phase transitions. Encapsulation enables the preservation of their thermal efficiency and prevents adherence on the surface where they are applied. For PCM application, particles with high load are desirable, and the coating in fluidized bed represents a scalable way to protect them. However, this process requires PCMs in solid state and, thus, it is restricted to their phase change temperature. Carnauba wax (CW) has a high enthalpy and relatively high melting point value, which can be a promising organic PCM and desirable to be employed in processes of coating. This work aimed to coat CW particles in fluidized bed. Some strategies were adopted to increase the load of wax in a particle and reduce experimental assays of coating. For this purpose, CW particles were produced by cold extrusion and a preliminary selection of potential substances to be used as coating material (chitosan, Eudragit (R) L30-D55, gum Arabic, maltodextrin and sodium alginate) was performed based on their rheological and adhesive properties. Adhesive property was evaluated through the contact angle between the CW and the coating materials. Suspensions containing sodium alginate and Eudragit showed the lowest contact angle (theta congruent to 40), low viscosity, and could restrain the volumetric variation of CW particles (coating efficiency = 55%) under heating at 100 degrees C for at least 1 h. Coating solutions/suspensions with contact angle above 57 degrees and high viscosity were not effective to coat the particles. This study allowed a successful coating process of CW particles in fluidized bed, with potential application to other PCMs and, consequently, enlarging the range of thermal responsive textile and construction materials, and food packages. (C) 2018 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 15/11629-2 - Strategies for producing lipidic particles using fluidized bed
Grantee:Bruna Barbon Paulo
Support type: Scholarships in Brazil - Master
FAPESP's process: 11/04230-5 - Design of particles for functional finishing of textiles: investigation of microencapsulation techniques
Grantee:Ana Silvia Prata
Support type: Research Grants - Young Investigators Grants