Volume 8, No. 4, December 2020
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Microencapsulation of the as-Synthesized and off-the-Shelf Thermochromic Dyes by Nanosized SiO2 for Thermal Energy Savings Applications

Abdullatif Hakami1, Mingyang Huang1, Sharan Indrakar1, Ashwini Krishnegowda1, Elias Stefanakos1, and Sesha Srinivasan2
1.Clean Energy Research Center, College of Engineering, University of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620, USA.
2.Department of Natural Sciences, Florida Polytechnic University, 4700 Research Way, Lakeland, FL 33805, USA.
Abstract: This study is mainly focused on the fabrication of nano-SiO2 as an inorganic shell material encapsulated an organic thermochromic (TC) core material comprising of either the (i) three-component as-synthesized blue dyes [BDTCM@SiO2] or (ii) off-the-shelf (commercial) black dyes [CDTCM@SiO2]. Both the SiO2 encapsulated thermochromic systems have successfully demonstrated the color transition at around 31 oC. For the three-component thermochromic microcapsules, we have used the crystal violet lactone (CVL) as a leuco dye, bisphenol-A (BPA) as a color developer, and 1-tetradecanol (TD) as a solvent. Different wt% ratios of the thermochromic dye and the metal oxide were prepared to examine the effect of the core@shell ratio on the microstructural and thermal properties of the encapsulated microcapsules. The mean particles sizes of the BDTCM@SiO2 are below 100 nm, whereas, the CDTCM@SiO2 samples exhibited the mean particle sizes varied in the range of 100-1000 nm. The endothermic phase transition due to melting and in general, the thermal stabilities of these SiO2 encapsulated TCMs have been explored for the purpose of deploying these systems for thermal energy savings or storage applications.

Key words: Thermochromic materials, nanoparticles, chromaticity, transition temperature, enthalpy, BDTCM@SiO2, CDTCM@SiO2.

Cite: Abdullatif Hakami, Mingyang Huang, Sharan Indrakar, Ashwini Krishnegowda, Elias Stefanakos, Sesha Srinivasan, "Microencapsulation of the as-Synthesized and off-the-Shelf Thermochromic Dyes by Nanosized SiO2 for Thermal Energy Savings Applications," International Journal of Materials Science and Engineering, Vol. 8, No. 4, pp. 105-117, December 2020. doi: 10.17706/ijmse.2020.8.4.105-117

Copyright © 2020 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).


General Information

ISSN: 2315-4527 (Print)
Abbreviated Title: Int. J. Mater. Sci. Eng.
Editor-in-Chief: Prof. Emeritus Dato' Dr. Muhammad Yahaya
DOI: 10.17706/ijmse
Abstracting/ Indexing: Ulrich's Periodicals Directory, Google Scholar, Crossref
E-mail: ijmse@iap.org