Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid Materials
Specific heat capacity at constant pressure <i>c<sub>p</sub></i> (J K<sup>−1</sup> g<sup>−1</sup>) is an important thermodynamic property that helps material scientists better understand molecular structure and physical properties. Engineers control te...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-09-01
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| Series: | Thermo |
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| Online Access: | https://www.mdpi.com/2673-7264/3/4/32 |
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| author | Brandon C. Wada Oliver W. M. Baldwin Gerald R. Van Hecke |
| author_facet | Brandon C. Wada Oliver W. M. Baldwin Gerald R. Van Hecke |
| author_sort | Brandon C. Wada |
| collection | DOAJ |
| description | Specific heat capacity at constant pressure <i>c<sub>p</sub></i> (J K<sup>−1</sup> g<sup>−1</sup>) is an important thermodynamic property that helps material scientists better understand molecular structure and physical properties. Engineers control temperature (through heat transfer) in physical systems. Differential Scanning Calorimetry (DSC) is an analytical technique that has been used for over fifty years to measure heat capacities with milligram size samples. For existing procedures, such as ASTM E1269−11 (2018), the accuracy of molar heat capacity measurements is typically ±2–5% relative to the literature values, even after calibration for both heat flow and heat capacity. A comparison of different DSC technologies is beyond the scope of this paper, but the causes of these deviations are common to all DSC instruments, although the magnitude of the deviation (observed and accepted) varies with instrument design. This paper presents a new approach (Heat–Cool) for measuring more accurate and reproducible specific heat capacities of materials. In addition to better performance, the proposed method is faster and typically requires no additional calibration beyond the routine calibration of temperature and heat flow, with melting point standards common to all applications of DSC. Accuracy, as used throughout this paper, means deviation from the literature. The estimated standard deviation of repeated measurements of the <i>c<sub>p</sub></i> values obtained with the Heat–Cool technique typically falls in the ±1–2% range. |
| first_indexed | 2024-03-08T20:18:47Z |
| format | Article |
| id | doaj.art-120d9a92aa884894a8b9f1168a1d6f17 |
| institution | Directory Open Access Journal |
| issn | 2673-7264 |
| language | English |
| last_indexed | 2024-03-08T20:18:47Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Thermo |
| spelling | doaj.art-120d9a92aa884894a8b9f1168a1d6f172023-12-22T14:45:46ZengMDPI AGThermo2673-72642023-09-013453754810.3390/thermo3040032Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid MaterialsBrandon C. Wada0Oliver W. M. Baldwin1Gerald R. Van Hecke2Department of Chemistry, Harvey Mudd College, 301 Platt Blvd, Claremont, CA 91711, USADepartment of Chemistry, Harvey Mudd College, 301 Platt Blvd, Claremont, CA 91711, USADepartment of Chemistry, Harvey Mudd College, 301 Platt Blvd, Claremont, CA 91711, USASpecific heat capacity at constant pressure <i>c<sub>p</sub></i> (J K<sup>−1</sup> g<sup>−1</sup>) is an important thermodynamic property that helps material scientists better understand molecular structure and physical properties. Engineers control temperature (through heat transfer) in physical systems. Differential Scanning Calorimetry (DSC) is an analytical technique that has been used for over fifty years to measure heat capacities with milligram size samples. For existing procedures, such as ASTM E1269−11 (2018), the accuracy of molar heat capacity measurements is typically ±2–5% relative to the literature values, even after calibration for both heat flow and heat capacity. A comparison of different DSC technologies is beyond the scope of this paper, but the causes of these deviations are common to all DSC instruments, although the magnitude of the deviation (observed and accepted) varies with instrument design. This paper presents a new approach (Heat–Cool) for measuring more accurate and reproducible specific heat capacities of materials. In addition to better performance, the proposed method is faster and typically requires no additional calibration beyond the routine calibration of temperature and heat flow, with melting point standards common to all applications of DSC. Accuracy, as used throughout this paper, means deviation from the literature. The estimated standard deviation of repeated measurements of the <i>c<sub>p</sub></i> values obtained with the Heat–Cool technique typically falls in the ±1–2% range.https://www.mdpi.com/2673-7264/3/4/32DSCmodulated DSCspecific heat capacityHeat–Coolliquid heat capacity |
| spellingShingle | Brandon C. Wada Oliver W. M. Baldwin Gerald R. Van Hecke Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid Materials Thermo DSC modulated DSC specific heat capacity Heat–Cool liquid heat capacity |
| title | Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid Materials |
| title_full | Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid Materials |
| title_fullStr | Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid Materials |
| title_full_unstemmed | Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid Materials |
| title_short | Heat–Cool: A Simpler Differential Scanning Calorimetry Approach for Measuring the Specific Heat Capacity of Liquid Materials |
| title_sort | heat cool a simpler differential scanning calorimetry approach for measuring the specific heat capacity of liquid materials |
| topic | DSC modulated DSC specific heat capacity Heat–Cool liquid heat capacity |
| url | https://www.mdpi.com/2673-7264/3/4/32 |
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