首页|Supercooling Suppression of Microencapsulated n-Alkanes by Introducing an Organic Gelator
Supercooling Suppression of Microencapsulated n-Alkanes by Introducing an Organic Gelator
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Supercooling of the microencapsulated phase change materials(PCMs) during cooling usually happens.This phenomenon can interfere with heat transfer and is necessary to further overcome.In this study,melamine-formaldehyde microcapsules containing two n-alkane PCMs,namely,n-dodecane(C12) or n-tetradecane(C14)were prepared by in situ polymerization.A small amount of n-hexatriacontane(C36) was introduced as an organic gelator into the core of microcapsules to cope with the supercooling problem.Analyses demonstrate that supcrcooling of the microencapsulated C12 or C14 was significantly suppressed by adding 3％(mass fraction) C36,without changing the spherical morphology and dispersibility.It could be also found that the enthalpy of microencapsulated C12 or C14 containing C36 was similar to that of microencapsulated n-alkanes without C36,whereas the difference between onsets of crystallization and melting(degree of supercooling) is similar to that of those of pure n-alkanes,suggesting the remarkable suppression ability of the organic gelator on supercooling.
Tianjin Key Laboratory of Composite and Functional Materials. School of Materials Science and Engineering,Tianjin University, Tianjin 300072, P R. China
Analysis and Measurement Center, Tianjin University, Tianjin 300072, P R. China
NETL
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万方数据
维普
