高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (12): 2310.

• 研究论文 • 上一篇    下一篇

差示扫描量热仪测定比热容方法的改进

李文波1,薛锋1,程镕时1,2   

  1. 1.华南理工大学材料科学与工程学院,广州510640;
    2.南京大学化学化工学院,南京230091
  • 收稿日期:2004-11-10 出版日期:1905-03-14 发布日期:1905-03-14
  • 通讯作者: 程镕时(1927年出生),男,教授，博士生导师,中国科学院院士，主要从事高分子凝聚态物理研究.E-mail:blackcloud_li@163.net

Modification of DSC Method for Measuring Specific Heat Capacity

LI Wen-Bo1, XUE Feng1, CHENG Rong-Shi1,2*   

  1. 1. College of Material Science & Engineering, South China University of Technology, Guangzhou 510640, China;
    2. College of Chemistry & Chemical Engineering, Nanjing University, Nanjing 230091, China
  • Received:2004-11-10 Online:1905-03-14 Published:1905-03-14
  • Contact: CHENG Rong-Shi;E-mail:blackcloud_li@163.net

被引次数

27

摘要：

对用常规热流型DSC仪测量物质比热容时的两个误差来源,即实际的升温速率偏离了程序设定的升温速率以及试样铝盘与参比铝盘两者质量的差异造成的影响进行数学分析,导出了计算比热容的改正方程.此方程的第一项HFT为实验热流值与实际升温速率的比值,第二项为测试过程中由于样品盘与参比盘的质量不同所引起的修正项，从而提高了测量结果的精确度.用此方法测量水、苯甲酸和氯化钾的比热容均得到较好的结果.

关键词: DSC;比热容;改进, DSC, 比热容, 改进

Abstract:

Specific heat capacity(cp) is a fundamental thermodynamic property. Its traditional measurement method by DSC requires three scans: a baseline scan, a scan using a sapphire standard, and the sample scan. The paper modifies the traditional DSC measurement method to eliminate two sources of error.  Namely they are inequality of the weight of the two empty aluminum pans for sample and reference and the departure of actual heating rate to that of programmed heating rate.  A modified formula considering these two effects is given.  The first term HFT is the ratio of heat flow to actual heating rate; while the second term is a correlation factor that caused by the weight difference of sample and reference aluminum pan.  The modified method offers a significant advance in the ease and reliability of measuring cp for the testing material of water, benzoic acid and potassium chloride.

Key words: DSC; Specific heat capacity; Modification, DSC, Specific heat capacity, Modification

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