石墨烯、超声波缓和木糖醇过冷性的研究  

Research on the Relaxation of Supercooling of Xylitol by Graphene and Ultrasonic Irradiation

作　　者：张焘[1] 周春玉[1] 张东[1] 

机构地区：[1]同济大学材料科学与工程学院,上海200092

出　　处：《材料开发与应用》2010年第2期57-60,80,共5页Development and Application of Materials

基　　金：教育部新世纪优秀人才支持计划(NCET-07-0626);上海市"科技创新行动计划"国际合作项目(08160706900);上海市"科技创新行动计划"基础研究重点项目(09JC1414400);国家高技术研究发展计划(863计划)课题(2009AA05Z419)

摘　　要：中高温相变储能技术对于能源的开发和合理利用具有重要的意义,在太阳能热发电、工业热利用及余热回收方面有着显著优点。作为相变储能材料的木糖醇在凝固放热过程中有强烈的过冷倾向,不产生任何结晶。本研究采用超声波照射和添加石墨烯的方法缓和过冷,并进行了试验研究。试验结果显示,超声波和石墨烯均能有效缓和木糖醇的强过冷倾向,激发木糖醇成核结晶,并且最初的成核结晶位置与超声波和石墨烯作用相关。Medium and high temperature phase change energy storage materials offer an useful technology for development and utilization of energy, and have obvious advantages in solar thermal power generation, industrial process heat use and waste heat recovery and so on. As a phase change energy storage material, xylitol exhibits a disadvantage of large extent of supercooling in the process of solidifieating heat release and does not have any crystal. This paper presents the experimental study on relaxation of supercooling of xylitol by ultrasonic irradiation and adding graphene. The result shows that ultrasonic irradiation and adding graphene are both useful methods for relaxation of supercooling of xylitol and stimulation of nucleation and crystallization of xylitol. The loeation of the initial nucleation and crystallization is related to the role of ultrasonic irradiation and adding graphene.

关 键 词：相变储能材料 木糖醇 过冷 石墨烯 超声波 

分 类 号：TB34[一般工业技术—材料科学与工程]