Evaluation of Uncertainty in the Error of Indication of Surface Tensiometers
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摘要: 表面张力是液体重要的基本性质之一,对其准确测量对工业生产、科学研究有着重要的作用。目前对于表面张力的测量不确定度缺乏细致深入的评定,表面张力仪的校准工作缺乏相应的依据。对基于铂金板法和铂金环法的表面张力示值误差的测量不确定度进行了研究,结果表明:示值误差的不确定度主要来源于测量数据重复性及方法参考值的不确定度,其中参考值的不确定度主要来源于探针的测量尺寸引入的不确定度,专用砝码和重力加速度引入的不确定度小于测量尺寸引入的不确定度;对于具有同样测量重复性水平的仪器,铂金板法测量的示值误差不确定度大于铂金环法。Abstract: Surface tension is one of the most important basic properties of liquid. Accurate measurement of surface tension plays an important role in industrial production and scientific research. At present, calibration of surface tensiometers in China lacks foundation due to the lack of detailed research on evaluation of measurement uncertainty of surface tension. This paper studies the measurement uncertainty in the error of indication of surface tensiometers based on the platinum plate method and the platinum ring method. The results showed that the main uncertainty components come from the measurement repeatability and the reference value. The uncertainty of reference value mainly comes from the probe size. The uncertainty caused by the special weights and the gravity acceleration is less than that caused by the probe size. For the same level of measurement repeatability, the uncertainty in the error of indication of a surface tensiometer based on the platinum plate method is greater than that of a surface tensiometer based on the platinum ring method.
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Key words:
- surface tension /
- measurement uncertainty /
- platinum plate method /
- platinum ring method
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表 1 铂金板法表面张力测试结果
Table 1. Measurement results of surface tension by the plate method
测量次数 表面张力/(mN.m−1) 1 121.828 2 121.825 3 121.825 4 121.802 5 121.830 6 121.823 平均值 121.822 表 2 铂金板法计算常数测量结果
Table 2. Measurement results of the constants by the plate method
测量次数 铂金板底部宽度t/mm 铂金板底部长度$ {d}_{3} $/mm 1 0.37 19.96 2 0.35 19.98 3 0.36 19.97 平均值 0.36 19.97 表 3 铂金环法计算常数测量结果
Table 3. Measurement results of the constants by the ring method
测量次数 铂金环外圆直径${d_0}$/mm 铂金丝直径${d_1}$/mm 1 19.32 0.45 2 19.30 0.46 3 19.30 0.44 平均值 19.30 0.45 -
[1] 邓丽君, 曹亦俊, 王利军. 起泡剂溶液的表面张力对气泡尺寸的影响[J]. 中国科技论文, 2014, 9(12): 1340-1343. doi: 10.3969/j.issn.2095-2783.2014.12.003 [2] 吕瑞超, 刘红, 高久良, 等. 醇水混合冷却剂表面张力和接触角的测定[J]. 工程热物理学报, 2020, 41(3): 709-713. [3] NISHIO T, NAGASAKA Y. Simultaneous measurement of surface tension and kinematic viscosity using thermal fluctuations[J]. International Journal of Thermophysics, 1995, 16(5): 1087-1097. doi: 10.1007/BF02081277 [4] 江润生, 张立鹏. 探针型表面张力测试技术的研究与应用进展[J]. 化学通报, 2016, 79(9): 793-797. [5] TAVANA H, SIMON F, GRUNDKE K, et al. Interpretation of contact angle measurements on two different fluoropolymers for the determination of solid surface tension[J]. Journal of Colloid and Interface Science, 2005, 291(2): 495-506. [6] 郭瑞. 表面张力测量方法综述[J]. 计量与测试技术, 2009, 36(4): 62-64. doi: 10.3969/j.issn.1004-6941.2009.04.030 [7] 尹东霞, 马沛生, 夏淑倩. 液体表面张力测定方法的研究进展[J]. 科技通报, 2007, 23(3): 424-429. doi: 10.3969/j.issn.1001-7119.2007.03.025 [8] 魏兴. 平板法液体表面张力测试仪进口铂金板可替换性研究[J]. 现代丝绸科学与技术, 2019, 34(6): 22-25. doi: 10.3969/j.issn.1674-8433.2019.06.007 [9] 赵慧晖, 杜烨, 翟月勤, 等. 白金板法和白金环法测定橡胶胶乳表面张力的对比[J]. 弹性体, 2019, 29(2): 53-58. doi: 10.3969/j.issn.1005-3174.2019.02.011 [10] 郭杰, 余仲达, 郑少波, 等. 一种新的表面张力测定方法——真球气泡法[J]. 上海大学学报(自然科学版), 2020, 26(2): 244-254. [11] 赵婷婷. 液体表面张力系数实验仪的设计与测量原理[J]. 山西大同大学学报(自然科学版), 2019, 35(2): 15-16. [12] 林仁荣, 邱祖强, 陈丽敏, 等. 拉脱法测量液体表面张力系数的改进[J]. 大学物理, 2017, 36(2): 39-42. [13] 全国力值硬度计量技术委员会. 界面张力仪校准规范: JJF 1464—2014[S]. 北京: 中国质检出版社, 2014: 9. [14] 倪育才. 实用测量不确定度评定[M]. 第4版. 北京: 中国质检出版社, 2014: 97-119. [15] 全国法制计量管理计量技术委员会. 测量不确定度评定与表示: JJF1059.1—2012[S]. 北京: 中国质检出版社, 2013: 2. [16] 李红梅. 标准物质质量控制及不确定度评定[M]. 北京: 中国质检出版社, 2014: 230-286. [17] 全国质量密度计量技术委员会. 砝码检定规程: JJG 99—2006[S]. 北京: 中国质检出版社, 2006.