Preparation and properties of dodecane microemulsion ice slurry

doi:10.19799/j.cnki.2095-4239.2020.0351

Abstract

Abstract:

Ice slurry is a kind of cold storage medium and secondary refrigerant with good heat transfer performance. Microemulsions of oil in water (O/W) and water in oil (W/O) are prepared to study ice slurry preparation using microemulsion. We used dodecane as the oil phase, hexanol as the cosurfactant, potassium oleate, sodium oleate, ammonium lauryl sulfate, and their mixtures as surfactants. We analyzed the properties and structures of the microemulsion through centrifugal, particle size, conductivity, and thermal conductivity tests. The optimum preparation system of the microemulsion ice slurry is determined according to the subcooling degree and phase change temperature, and its growth process is described. The experimental results show that the surfactant's lipophilicity to form stable microemulsions increases with the increase in the mass ratio of oil and water. The oil–water mass ratio and hexanol concentration of the microemulsion affect the supercooling degree and phase transition temperature of the ice slurry. O/W microemulsion with an oil–water mass ratio of 1:9 has a good performance for preparing ice slurry. Its subcooling degree is not more than 0.3 ℃, and the phase transition temperature is about -0.1 ℃. The stability of the microemulsion and its ice slurry preparation was verified by thermal cycling. After 500 thermal cycles between -5 ℃ and 25 ℃, no stratification is found, indicating that the microemulsion has good stability. The microemulsion may be used to prepare ice slurry for a long time.

Key words: microemulsion, surfactant, degree of supercooling, phase-transition temperature, thermal cycle, stability

CLC Number:

TB 61

Xianwei ZHU, Zhigao SUN. Preparation and properties of dodecane microemulsion ice slurry[J]. Energy Storage Science and Technology, 2021, 10(2): 506-513.

Figures/Tables 14

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材料	纯度	生产厂家
十二烷	分析纯	广东翁江化学试剂有限公司
油酸钾	化学纯	国药集团试剂有限公司
油酸钠	化学纯	国药集团试剂有限公司
十二烷基硫酸铵	分析纯	成都艾科达化学试剂有限公司提供
己醇	分析纯	天津百伦斯生物技术有限公司
蒸馏水	—	实验室自制

油水比	HLB值	己醇浓度/%	表面活性剂构成
1:9	24	3.17	油酸钾+ 十二烷基硫酸铵
	25	3.08
	26	3.68
	27	3.59
	28	4.01
	29	4.18
	30	4.60
	31	5.58	十二烷基硫酸铵
2:8	21	4.51	油酸钾+ 十二烷基硫酸铵
	22	5.01
	23	4.76
	24	4.68
	25	5.01
	26	5.34
3:7	18	11.86	油酸钠
	19	13.45	油酸钾+油酸钠
	20	16.09	油酸钾

油水比	电导率/μs·cm^-1	平均电导率/μs·cm^-1
1：9	9310	9810
	10060
	10060
2：8	10040	9787
	9780
	9540
3：7	1.3	1.69
	1.35
	2.42

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