One Step Fabrication of Core-Shell Structures in Immiscible Alloys for Thermal Energy Storage

Abstract:

The microscopic morphologies of Bi₃₀Ga₇₀ immiscible alloy particles were investigated. Monosized microparticles with similar core-shell structures were fabricated for the first time by one step using the Pulsated Orifice Ejection Method. The EDS revels that the core and the shell consist of a Ga-rich phase (＞90 at. %) and a Bi-rich phase (＞80 at. %), respectively. The DSC testing at different temperatures is performed. Core-shell microstructures as well as endothermic peaks and exothermic peaks are observed after heating-cooling cycles when the working temperature is below the temperature of spinodal line, indicating good thermal stability after phase transformation. The thermal energy storage was preliminary tested, which is a good attempt for thermal energy storage. It is likely to use core-shell structures as microencapsulated phase change materials.

• Periodical: Advanced Materials Research (Volume 983)
• Pages: 131-134
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.983.131
• Online since: June 2014
• Authors: Fu Min Xu, Ming Bi Fu, Wei Dong*, Li Zhao, Dong Lu, Yi Tan
• Keywords: Core-Shell, Energy Storage, Immiscible Alloy, Microstructure, Phase Transformation

References

[1] M.F. Mohammed, M.K. Amar, A.R. Siddique, A.H. Said, A review on phase change energy storage: materials and applications, Energy Convers. Manage. 45(2004)1597-1615.

[2] K. Murat, M. Khamid, Solar energy storage using phase change materials, Renew. Sust. Energ. Rev. 11(2007) 1913-(1965).

[3] A.M. Khudhair, M.M. Farid, A review on energy conservation in building applications with thermal storage by latent heat using phase change materials, Energy Convers. Manage. 45(2004)263-275.

DOI: 10.1016/s0196-8904(03)00131-6

[4] M.H. Gtucho, Microcapsules and Microencapsulation Techniques, Noyes Date Corp Press, New York, (1976).

[5] C.P. Wang, X.J. Liu, I. Ohnuma, R. Kainuma, K. Ishida, Formation of immiscible alloy powders with egg-type microstructure, Science 297(2002)990-993.

DOI: 10.1126/science.1073050

[6] B.Q. Ma, J.Q. Li, Z.J. Peng, G.C. Zhang, Structural morphologies of Cu-Sn-Bi immiscible alloys with varied compositions, J. Alloys Compd. 535 (2012) 95-101.

DOI: 10.1016/j.jallcom.2012.04.032

[7] Z. Belen, M. Jose, F.C. Luisa, M. Harald, Review on thermal energy storage with phase change: materials, heat transfer analysis and applications, Appl. Therm. Eng. 23(2003) 251-283.

[8] M.K. Murat, High-temperature phase change materials for thermal energy storage, Renew. Sust. Energ. Rev. 14 (2010) 955-970.

[9] Y. Li, W. Dong, Y. F. Fu, Y. Tan, A. Miura, A. Kawasaki, The critical cooling rate of Fe-based mono-sized spherical particles with fully glassy phase, Adv. Mater. Res. 509(2012)185-191.

DOI: 10.4028/www.scientific.net/amr.509.185

[10] A.H. Ayyad, W. Freyland, Wetting transition in liquid Ga–Bi alloys: light scattering study of surface energy and entropy, Surf. Sci. 506(2002)1-11.

DOI: 10.1016/s0039-6028(02)01439-5

[11] T. Qin, H.P. Wang, B.B. Wei, Simulated evolution process of core-shell microstructures, Sci. China. Ser. G 50(2007)546-552.

DOI: 10.1007/s11433-007-0045-7

[12] R.P. Shi, C.P. Wang, D. Wheeler, X.J. Liu, Y. Wang, Formation mechanisms of self-organized core/shell and core/shell/corona microstructures in liquid droplets of immiscible alloys, Acta Mater. 61 (2013) 1229-1243.

DOI: 10.1016/j.actamat.2012.10.033

[13] Information on http: /www. factsage. cn/fact/phase diagram.