碳纳米管水悬浮液过冷度及非等温结晶过程

doi:10.3969/j.issn.2095-4239.2014.03.011

储能科学与技术 ›› 2014, Vol. 3 ›› Issue (3): 256-261.doi: 10.3969/j.issn.2095-4239.2014.03.011

碳纳米管水悬浮液过冷度及非等温结晶过程

王晓¹, 候鉴峰¹, 吴雨越¹, 范利武¹, 徐旭², 俞自涛¹, 胡亚才¹

1浙江大学热工与动力系统研究所,浙江杭州 310027;
2中国计量学院计量测试工程学院,浙江杭州 310018

收稿日期:2013-09-23 出版日期:2014-05-01 发布日期:2014-05-01
通讯作者: 范利武,E-mail:liwufan@zju.edu.cn.
作者简介:第一作者:王晓(1988--),女,硕士研究生,从事热物性测试研究,E-mail:runnerwangxiao@163.com;
基金资助:
国家自然科学基金项目(51276159,51106144)

Supercooling behaviour and non-isothermal crystallization processes of aqueous suspensions of carbon nanotubes

WANG Xiao¹, HOU Jianfeng¹, WU Yuyue¹, FAN Liwu¹, XU Xu², YU Zitao¹, HU Yacai¹

1 Institute of Thermal Science and Power Systems,Zhejiang University,Hangzhou 310027,Zhejiang,China;
2 College of Metrological and Measurement Engineering,China Jiliang University,Hangzhou 310018,Zhejiang,China

Received:2013-09-23 Online:2014-05-01 Published:2014-05-01

摘要/Abstract

摘要： 采用添加碳纳米管形成悬浮液的方法可以有效地提高基液的导热系数,碳纳米管的存在还将对悬浮液的固液相变行为产生可观的影响.利用差示扫描量热仪对低浓度碳纳米管水悬浮液的过冷度进行了非等温结晶实验测试,对比分析了不同浓度(质量分数最高为1%)的悬浮液在不同降温速率情况下过冷度的变化规律.实验结果表明,由于碳纳米管的存在,悬浮液的过冷度较之纯水有所降低.随着浓度的提高,悬浮液的过冷度呈逐步下降的趋势.在最高浓度1%时,悬浮液的过冷度较之纯水下降了约7 ℃.此外,悬浮液的过冷度随着降温速率的增大略有升高,其中浓度为0.01%的悬浮液在降温速率为10 ℃/min时较2 ℃/min时增大了约4 ℃.采用碳纳米管悬浮液作为蓄冷工质对整个非等温结晶过程并未体现出加速的效果,但能在较慢的降温速率下有效地降低水的过冷度.

关键词: 水悬浮液, 碳纳米管, 过冷度, 非等温结晶, 差示扫描量热, 结晶度

Abstract: This paper reports a study on the supercooling behaviour and non-isothermal crystallization processes of dilute aqueous suspensions of carbon nanotubes. A differential scanning calorimeter (DSC) was used in the study. The dependence of the extent of the suspension supercooling was measured as a function of nanotube concentration and cooling rate. It was found that the extent of supercooling of water decreased due to the addition of carbon nanotubes and the extent of decrease increased with increasing carbnon nanotube concentration. The decrease in the supercooling was nearly 7 ℃ at a concentration of 1%. An increase in the cooling rate led to a slight increase in the extent of supercooling. Although the use of carbon nanotubes was able to reduce the extent of supercooling, it did not show any influence on the non-isothermal crystallization processes.

Key words: aqueous suspensions, carbon nanotubes, supercooling, non-isothermal crystallization, differential scanning calorimetry, degree of crystallinity

中图分类号:

TM02

王晓, 候鉴峰, 吴雨越, 范利武, 徐旭, 俞自涛, 胡亚才. 碳纳米管水悬浮液过冷度及非等温结晶过程[J]. 储能科学与技术, 2014, 3(3): 256-261.

WANG Xiao, HOU Jianfeng, WU Yuyue, FAN Liwu, XU Xu, YU Zitao, HU Yacai. Supercooling behaviour and non-isothermal crystallization processes of aqueous suspensions of carbon nanotubes[J]. Energy Storage Science and Technology, 2014, 3(3): 256-261.

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碳纳米管水悬浮液过冷度及非等温结晶过程

Supercooling behaviour and non-isothermal crystallization processes of aqueous suspensions of carbon nanotubes

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