Abstract
This chapter focuses on the microencapsulated thermochromic color switching phase change materials (PCMs) and their thermotropic characteristics for thermal energy storage and energy savings applications. The thermochromic PCMs as a core particle have been successfully microencapsulated by a stable polymer or a metal oxide shell layer structure. Two types of thermotropic material systems have been chosen for microencapsulation and their thermal transition (latent heat) behavior is evaluated. For example, in the first case, a three-component thermochromic blue dye (involving a leuco-dye containing crystal violet lactone, bisphenol-A, and myristic alcohol) with color switching characteristics that are microencapsulated by a PMMA polymer shell layer. In the second approach, a PCM, such as n-eicosane that was microencapsulated by a titania shell layer for thermal energy storage. These two different sets of microencapsulated thermochromic PCMs have been characterized to understand the structural, microstructural, chemical, surface, interface, thermal, and color switching properties.
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