大学物理 ›› 2018, Vol. 37 ›› Issue (7): 31-36.doi: 10. 16854 /j. cnki. 1000-0712. 170565

• 物理实验 • 上一篇    下一篇

差示扫描量热法研究系列浓度氯化钠水溶液的固液相变

王丽娜,杜斌,赵兴宇,黄以能,周恒为   

  1. 1. 伊犁师范学院物理科学与技术学院,新疆凝聚态相变与微结构实验室,新疆伊宁835000; 2. 南京大学物理学院,国家固体微结构重点实验室,江苏南京210093
  • 出版日期:2018-07-20 发布日期:2018-07-20
  • 通讯作者: 周恒为,E - mail:zhw33221@163. com
  • 作者简介:王丽娜( 1983—) ,女,河南许昌人,伊犁师范学院物理科学与技术学院讲师,主要从事凝聚态相变与微
  • 基金资助:
    新疆维吾尔自治区自然科学基金( 2015211C301) 资助

Solid - liquid phase transition in sodium chloride aqueous solution of series concentration studied by differential scanning calorimetry

WANG Li-na1,2,DU Bin1,ZHAO Xing-yu1,2,HUANG Yi-neng1,2,ZHOU Heng-wei1   

  1. 1. Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters Physics,College of Physical Science and Technology,Yili Normal University,Yining,Xinjiang 835000,China; 2. National Lab of Solid State Microstructures,School of Physics,Nanjing University,Nanjing,Jiangsu 210093,China
  • Online:2018-07-20 Published:2018-07-20

摘要: 在- 50 ~ 50℃范围内,利用差示扫描量热法测量了21 个摩尔比b 的系列氯化钠水溶液,除纯水外,所有浓度的溶液 均出现了双峰,随b 的增加,高温峰强度减小、峰位向低温移动,低温峰则相反,最后逐渐重合. 提出了重叠双峰的分峰方案,并 得到了各熔化峰的特征量随b 的变化结果,该结果与微观相分离模型一致,并据此给出了溶液中氯化钠浓度空间分布情况. 该 研究对深入认知生物体中电解质的微观结构和固液相变等有一定的参考价值.

关键词: 固液相变, 氯化钠水溶液, 差示扫描量热, 微观相分离模型, 匀相模型

Abstract: The heat flows of a series of sodium chloride aqueous solutions contained 21 molar ratios b are measured and analyzed by differential scanning calorimeter in the range of - 50 ~ 50℃. All measured solutions except water appear two endothermic peaks. The peak positions of both move to each other with the increase of b,at the same time,the intensity of high temperature peak decreases and the one of low temperature peak increases. At last,two peaks are gradually overlapped. A method to separate overlapping double peaks is proposed and the b dependent characteristic parameters of melting peak are obtained,which are consistent with the micro - phase separation model. Finally,the spatial distribution of sodium chloride aqueous solutions concentration is given. This research will provide a certain reference to deeply understand the microcosmic structure of the sodium chloride in aqueous solution and solid - liquid phase transition.

Key words: solid - liquid phase transition, sodium chloride aqueous solution, DSC, micro - phase separation model, homogeneous model