硬脂酸和硬脂酸/MXene复合相变材料的结晶动力学

doi:10.19799/j.cnki.2095-4239.2022.0414

摘要/Abstract

摘要：

限域空间内物质呈现出异于开放空间的物理化学性质和结晶行为。为探索限域效应对受限相变物质结晶行为的影响，以硬脂酸为相变储热介质、MXene为限域载体，采用水热法制备了硬脂酸/MXene复合相变材料。借助差示扫描量热仪和偏光显微镜分析了硬脂酸及其复合相变材料的结晶行为，通过Avrami、Jeziorny、Mo和Kissinger模型研究了结晶动力学，探讨了二维限域载体MXene对受限硬脂酸结晶行为的影响。结果表明：等温结晶过程中，硬脂酸和硬脂酸/MXene表现出相反的温度依赖性结晶行为，硬脂酸在低温下的结晶速率较大，而硬脂酸/MXene则在较高温下表现出小的半结晶时间和快的结晶速率。非等温结晶过程中，MXene对硬脂酸的结晶行为存在异相促进成核和限域效应抑制晶体生长的双重作用。在较低的冷却速率下，MXene的异相成核作用明显，而在较高的冷却速率下，限域效应则成为主导因素。限域载体的引入增加了硬脂酸的结晶能垒，硬脂酸和硬脂酸/MXene非等温结晶过程的活化能分别为174 kJ/mol和208 kJ/mol。本文探索了受限空间内相变物质的结晶动力学，为复合相变材料的设计及性能优化提供了理论依据。

关键词: 硬脂酸, MXene, 结晶动力学

Abstract:

The confined molecules exhibit different physicochemical properties and crystallization behavior from the bulk. Therefore, to explore the effect of confinement on the crystallization behavior of confined phase change materials (PCMs), stearic acid/MXene (SA/MXene) composite PCMs were prepared by hydrothermal method using stearic acid (SA) and MXene as the heat storage medium and matrix, respectively. The crystallization behavior was analyzed using a differential scanning calorimeter (DSC) and polarized microscopy (PM), and the SA and SA/MXene crystallization kinetics were studied by the Avrami, Jeziorny, Mo, and Kissinger models. The effects of confinement on the crystallization behavior of confined stearic acid were also analyzed. The results show that SA and SA/MXene exhibit opposite temperature-dependent crystallization behavior during the isothermal crystallization process. SA presents a larger crystallization rate than SA/MXene at low temperatures, while SA/MXene exhibits a shorter half-crystallization time and a faster crystallization rate at higher temperatures. In the non-isothermal crystallization process, MXene has dual effects on the crystallization behavior of stearic acid, which include promoting heterogeneous nucleation under a low cooling rate and inhibiting the confinement effect at a high cooling rate. The confinement effect increases the energy barriers of the confined molecules during the crystallization process. Therefore, the crystallization activation energy of SA increases from 174 kJ/mol to 208 kJ/mol^{in SA/MXene. Finally, this study can provide a theoretical basis for designing and optimizing shape-stabilized composite phase change materials.}

Key words: stearic acid, MXene, crystallization kinetics

中图分类号:

TB 34

杨博超, 吕洁, 甄紫薇, 王建君, 沈玉霞, 张宇, 王毅. 硬脂酸和硬脂酸/MXene复合相变材料的结晶动力学[J]. 储能科学与技术, 2022, 11(12): 3836-3844.

Bochao YANG, Jie LÜ, Ziwei ZHEN, Jianjun WANG, Yuxia SHEN, Yu ZHANG, Yi WANG. Crystallization kinetics of stearic acid and stearic acid/MXene composite phase change materials[J]. Energy Storage Science and Technology, 2022, 11(12): 3836-3844.

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样品	结晶过程	T_c/℃	t_1/2/min	G/min^-1	n	K	R²
SA	熔融结晶	57	0.36	2.78	1.94	5.91	0.99
	熔融结晶	65	0.55	1.82	1.57	2.04	0.99
	冷结晶	57	0.50	2.00	2.72	3.76	0.96
	冷结晶	65	0.46	2.17	2.51	4.39	0.99
SA/MXene	熔融结晶	73	0.31	3.23	2.43	13.07	0.99
	熔融结晶	81	0.26	3.85	1.82	8.37	0.99
	冷结晶	73	0.35	2.86	2.14	6.49	0.99
	冷结晶	81	0.48	2.08	3.13	4.76	0.95

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