Pomegranate-like phase-change microcapsules based on multichambered TiO2 shell engulfing multiple n-docosane cores for enhancing heat transfer and leakage prevention
Pomegranate-like phase-change microcapsules based on multichambered TiO2 shell engulfing multiple n-docosane cores for enhancing heat transfer and leakage prevention
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基于多室 TiO2 壳的石榴状相变微胶囊，包裹多个正二十二烷核，以增强传热和防泄漏
DOI：
10.1016/j.est.2022.104406
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发表时间：
2022
影响因子：
9.4
通讯作者：
Wang Xiaodong
中科院分区：
文献类型：
--
作者：
Chen Si;Liu Huan;Wang Xiaodong
传统的蛋形核壳结构相变微胶囊在导热和防泄漏方面存在局限性。针对这两个问题，我们设计了一种独特的石榴状结构的二氧化钛@正二十二烷相变微胶囊，以增强其传热和防泄漏能力。通过钛源在非水乳液-模板体系中的可控水解反应，然后对其水解物进行缩聚，制备了微胶囊。在合成中，石榴状结构是由内部聚集的小尺寸胶束和外部大尺寸球形胶束组成的双层乳液体系，采用非离子表面活性剂模板两步乳化技术得到的。在去离子水作催化剂的缓慢滴加条件下，制得的微胶囊相变热高达170J/g以上，相变潜热性能优于文献报道的大多数二氧化钛基相变微胶囊。虽然石榴状二氧化钛@正二十二烷微胶囊的潜热容量比传统的蛋形微胶囊低，但由于其独特的石榴状结构，其传热、热响应和防泄漏能力得到了显著提高。石榴状二氧化钛@正二十二烷微胶囊的导热系数比纯品二十二烷提高了471%，泄漏率比鸡蛋状微胶囊降低了66.5%。本研究开发的新型石榴型相变微胶囊具有优异的热性能，在热能存储和管理应用方面具有巨大的潜力。
Conventional egg-like core–shell structured phase-change microcapsules present a limitation in thermal conductance and leakage prevention. Aiming at offering a solution to such two issues, we design a unique pomegranate-like structure for the TiO2@n-docosane phase-change microcapsules to enhance their heat transfer transfer and anti-leakage capabilities. The microcapsules were fabricated through a controllable hydrolysis reaction of titanic source in a nonaqueous emulsion-templating system, followed by the polycondensation of its hydrolysates. In the synthesis, the pomegranate-like structure was derived from a double-layered emulsion system based on the internal aggregated small-sized micelles and external large-sized spherical micelle employing a two-step emulsification technique with a nonionic surfactant template. The resultant microcapsules gained high phase-change enthalpies of over 170 J/g at a slow dropwise adding speed of deionized water as a catalyst, and their latent-heat capacity is superior to most of the TiO2-based phase-change microcapsules reported in the literature. Although the pomegranate-like TiO2@n-docosane microcapsules have a relatively lower latent-heat capacity than the conventional egg-like ones, their heat transfer, thermal response, and anti-leakage capability are improved significantly thanks to their unique pomegranate-like structure. Moreover, the pomegranate-like TiO2@n-docosane microcapsules obtained an increase in thermal conductivity by 471% in comparison with puren-docosane, and their leakage rate decreased by 66.5% compared to the egg-like ones. With superior thermal performance, the novel pomegranate-like phase-change microcapsules developed in this study offer great potential in thermal energy storage and management applications.
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