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《Journal of Zhejiang University(Engineering Science)》 2014-07
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Non-isothermal crystallization of aqueous graphene oxide suspensions

WANG Xiao;YAO Xiao-li;HOU Jian-feng;FAN Li-wu;XU Xu;YU Zi-tao;HU Ya-cai;Institute of Thermal Science and Power Systems,Zhejiang University;College of Metrological and Measurement Engineering,China Jiliang University;  
The thermal conductivity of phase change materials can be efficiently increased by adding graphene nanoadditives to form suspensions.The presence of the graphene nanoadditives is expected to have considerable influence on the solid-liquid phase change characteristics of the suspensions.The aqueous suspensions in the presence of graphene oxide nanosheets at dilute concentrations were characterized via the non-isothermal crystallization method on a differential scanning calorimeter.The dependence of the supercooling degree of the suspensions on the concentration(up to mass fraction of 1%)and the cooling rate was analyzed.Results show that the supercooling degree is lower than that of pure water due to the presence of the graphene oxide nanosheets and decreases gradually with increasing the mass fraction.The lowering of the supercooling degree was nearly 5℃at the highest mass fraction of 1%.In addition,the supercooling degree was shown to rise slightly with increasing the cooling rate,whereas the relative variation of the supercooling degree with respect to mass fraction was unaffected.The utilization of aqueous graphene oxide suspensions as cold storage media can lower the supercooling degree,whereas the non-isothermal crystallization processes are unable to be shortened.
【Fund】: 国家自然科学基金资助项目(51276159);; 中国博士后科学基金资助项目(2012M511362 2013T60589)
【CateGory Index】: TB383.1;TB34
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