Effect of nanoparticles on thermal properties of molten salt composite heat storage materials

Qiang YU; Yuanwei LU; Xiaopan ZHANG; Yuting WU

doi:10.11949/j.issn.0438-1157.20181516

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Effect of nanoparticles on thermal properties of molten salt composite heat storage materials

更新时间：2020-06-24

- Effect of nanoparticles on thermal properties of molten salt composite heat storage materials
- CIESC Journal Issue S1, Pages: 217-225(2019)
- 作者机构：
  
  北京工业大学环境与能源工程学院，北京 100124
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181516
  CLC： TK 512⁺4
- Received：26 December 2018，
  
  Revised：2019-01-07，
- 稿件说明：
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于强, 鹿院卫, 张晓盼, 吴玉庭. 纳米粒子对熔盐复合蓄热材料热物性的影响[J]. 化工学报, 2019, 70(S1): 217-225

YU Qiang, LU Yuanwei, ZHANG Xiaopan, WU Yuting. Effect of nanoparticles on thermal properties of molten salt composite heat storage materials[J]. CIESC Journal, 2019, 70(S1): 217-225
于强, 鹿院卫, 张晓盼, 吴玉庭. 纳米粒子对熔盐复合蓄热材料热物性的影响[J]. 化工学报, 2019, 70(S1): 217-225 DOI： 10.11949/j.issn.0438-1157.20181516.

YU Qiang, LU Yuanwei, ZHANG Xiaopan, WU Yuting. Effect of nanoparticles on thermal properties of molten salt composite heat storage materials[J]. CIESC Journal, 2019, 70(S1): 217-225 DOI： 10.11949/j.issn.0438-1157.20181516.

摘要

为了得到SiO

纳米粒子含量对SiO

/NaNO

-KNO

/EG复合蓄热材料比热容和热导率的影响，通过机械分散法，采用NaNO

-KNO

和不同质量分数（0.1%，0.5%，1%，2%，3%）的SiO

纳米粒子所形成的熔盐纳米材料作为蓄热材料，膨胀石墨（EG）作为基体材料，制备出纳米SiO

/NaNO

-KNO

/EG复合材料。对复合材料的比热容和热导率进行了测量，同时用扫描电镜对其微观结构特征进行了分析。结果表明，SiO

纳米粒子的质量分数为1%时，复合材料的平均比热容和热导率分别为3.92 J/(g·K)和8.47 W/(m·K)，与其他纳米SiO

添加比例相比，其比热容和热导率分别提高了1.37～2.17倍和1.7～3.2倍。这是由于复合材料表面会形成高密度的网状结构，这种具有较大比表面积和高表面能的特殊纳米结构可以提高复合材料的比热容和热导率。

Abstract

In order to study the effects of SiO

nanoparticles content on the specific heat capacity and thermal conductivity of nano-SiO

/NaNO

-KNO

/EG composite heat storage materials

a series of nano-SiO

/NaNO

-KNO

/EG composites were prepared by mechanical dispersion method. NaNO

-KNO

and SiO

nanoparticles with different mass fractions (0.1%

0.5%

3%) were used as heat storage materials and expanded graphite (EG) was used as matrix material. Then the specific heat and the thermal diffusivity of composite heat storage materials were measured

and the microstructural characteristics were analyzed by scanning electron microscopy (SEM). The results show that adding 1% of SiO

nanoparticles to the composite can significantly affect its average specific heat capacity and thermal conductivity

with a measured value of 3.92 J/(g·K) and 8.47 W/(m·K)

respectively

which are 1.37—2.17 times and 1.7—3.2 times higher than that of the other similar composites. This is owed to its high density network nanostructure with the large specific surface area and high surface energy which can improve the specific heat capacity and thermal conductivity.

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Keywords

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