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

doi:10.3969/j.issn.2095-4239.2014.03.011

Abstract

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

CLC Number:

TM02

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.

References

[1] Zhang Renyuan(张仁元). Phase Change Material with Phase Change Energy Storage Technology(相变材料与相变储能技术)[M]. Beijing:Science Press,2009.
[2] Zhu Dongsheng(朱冬生),Li Xinfang(李新芳),Wang Nan(汪南), et al . Fundamental properties and application prospect of the phase change nanofluid as a cold storage material[J]. Materials Review (材料导报),2007,21(4):87-91.
[3] Liu Yudong(刘玉东),Li Kuining(刘夔宁),He Qinbo(何钦波), et al . Study on thermal properties of low temperature nanocomposites for phase change cool storage[J]. Journal of Engineering Thermophysics (工程热物理学报),2008,29(1):105-107.
[4] Wu Shuying,Zhu Dongsheng,Li Xinfang, et al . Thermal energy storage behavior of Al 2 O 3 -H 2 O nanofluids[J]. Thermochimica Acta ,2009,483(1-2):73-77.
[5] Yang Shuo(杨硕),Zhu Dongsheng(朱冬生),Wu Shuying(吴淑英), et al . Study on phase-change cold storage characteristics of Al 2 O 3 -H 2 O nanofluids[J]. Journal of Refrigeration (制冷学报),2010,31(1):23-26.
[6] Bigg E K. The supercooling of water[J]. Proceedings of the Physical Society :Section B,1953,66(8):688-694.
[7] Angel C Z. Supercooled water[J]. Annual Review of Physical Chemistry ,1983,34:593-630.
[8] Hong Ronghua(洪荣华),Sun Zhijian(孙志坚),Wu Jie(吴杰), et al . Experimental study on reduce supercooling degree of ice storage solution using nucleation additive[J]. Journal of Zhejiang University : Engineering Science (浙江大学学报:工学版),2004,39(11):1797-1800.
[9] Chen Ying,Jia Lisi,Mo Songping. Experimental investigation of crystallization process of nanofluid by DSC[J]. Journal of South University : English Edition ,2010,26(2):359-363.
[10] Jia Lisi(贾莉斯),Chen Ying(陈颖),Mo Songping(莫松平). Solid-liquid phase change property of titanium dioxide nanofluid[J]. Journal of Engineering Thermophysics (工程热物理学报),2011,32(11):1913-1916.
[11] He Qinbo,Wang Shuangfeng,Tong Mingwei, et al . Experimental investigation on nucleation supercooling degree of TiO 2 -H 2 O nanofluids for cool storage[J]. Energy Conversion and Management ,2012,64:199-205.
[12] Gong Wei,Xiao Hongyi,Yang Zhen, et al . Study of the subcooling phenomenon of phase change material with different nanoparticlcle additives for energys storage[C]//Beijing:Proceedings of the 8th International Symposium on Heat Transfer,2012:1-6.
[13] Kousksou T,Rhafiki T,Mahdaoui M, et al . Crystallization of supercooled PCMs inside emulsions:DSC applications[J]. Solar Energy Materials and Solar Cells ,2012,107:28-36.
[14] Jia Lisi,Chen Ying,Mo Songping. Solid-liquid phase transition of nanofluids[J]. International Journal of Heat and Mass Transfer ,2013,59:29-34.
[15] Yu Zitao,Fang Xin,Fan Liwu, et al . Increased thermal conductivity of liquid paraffin-based suspensions in the presence of carbon nano-additives of various sizes and shapes[J]. Carbon ,2013,53:277-285.
[16] Wang Jifeng,Xie Huaqing,Xin Zhong. Thermal properties of paraffin based composites containing multi-walled carbon nanotubes[J]. Thermochimica Acta ,2009,488(1-2):39-42.
[17] Ijima S. Helical microtubules of graphitic carbon[J]. Nature ,1991,354:56-58.
[18] Kim P,Shi L,Majumdar A, et al . Thermal transport measurements of individual multiwalled nanotubes[J]. Physical Review Letters ,2001,87(21):215502.
[19] Choi S U S,Zhang Z G,Yu W, et al . Anomalous thermal conductivity enhancement in nanotube suspension[J]. Applied Physics Letters ,2001,79(14):2252-2254.
[20] Indhuja A,Suganthi K S,Manikandan S, et al . Viscosity and thermal conductivity of dispersions of gum arabic capped MWCNT in water:In?uence of MWCNT concentration and temperature[J]. Journal of the Taiwan Institute of Chemical Engineers ,2013,44(3):474-479.
[21] Shi Xiaomei,Wang Jingdai,Jiang Binbo, et al . Influence of nanofiller dimensionality on the crystallization behavior of HDPE/carbon nanocomposites[J]. Journal of Applied Polymer Science ,2013,128(6):3609-3618.