纳米甲壳素基Pickering乳液辅助构筑相变微胶囊

doi:10.3969/j.issn.1001-1803.2022.12.004

Abstract

Abstract:

Phase change microcapsules can enhance the thermal and mechanical performance of phase change materials used in thermal energy storage by increasing the heat transfer area and preventing the leakage of materials. In this paper, nano-chitin was prepared by a simple and efficient method, and then a Pickering emulsion was prepared by stabilizing paraffin with the nano-chitin. Finally, phase change microcapsules were obtained by emulsion template method. The effects of hydrochloric acid steaming time, nano-chitin suspension concentration and core-shell ratio on the surface morphology and particle size of microcapsules were studied. The results showed that, when the steaming time was 5 h, the concentration of nano-chitin suspension was 0.5%, and the core-shell ratio was 3∶1, the particle size of the microcapsules obtained was 29.6 μm and the melting enthalpy was up to 187.4 J/g, correspondingly indicative of an encapsulation rate of 71.6%. The thermal stability and thermal cycling performance of microcapsules were characterized by thermogravimetric analysis and heating/cooling cycle, showing a good thermal cycling stability.

Key words: phase change material, microcapsule, nano-chitin, Pickering emulsion

CLC Number:

TQ658

Chen Yunbo,Li Xinyi,Mao Zhiping,Xu Hong,Sui Xiaofeng. Fabrication of phase change microcapsules via nano-chitin stabilized Pickering emulsion[J].China Surfactant Detergent & Cosmetics, 2022, 52(12): 1286-1292.

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References 20

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样品	核壳比	汽蒸时间/h	w（甲壳素）/%
MPCM1	3∶1	9	0.4
MPCM2	3∶1	9	0.5
MPCM3	3∶1	9	1.0
MPCM4	3∶1	3	0.5
MPCM5	3∶1	5	0.5
MPCM6	4∶1	9	0.5

样品	熔融过程		结晶过程
样品	T_m/°C	ΔH_m /（J/g）	T_c /°C	ΔH_c/（J/g）
石蜡	47.87	261.7	33.52	260.5
MPCM5	48.07	187.4	34.48	186.0
循环50次	47.14	187.5	40.12	186.7
循环100次	47.14	188.2	39.73	187.6

Fabrication of phase change microcapsules via nano-chitin stabilized Pickering emulsion

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