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Miniaturized differential scanning calorimeter (DSC) with high resolution and high heating rates

Title data

Moos, Ralf ; Werner, Robin ; Distler, Johanna ; Gerlach, Michael ; Gollner, Michael ; Linseis, Florian ; Kita, Jaroslaw:
Miniaturized differential scanning calorimeter (DSC) with high resolution and high heating rates.
2022
Event: Eurosensors XXXIV , 19.-23. Sept. 2022 , Leuven, Belgium.
(Conference item: Conference , Poster )

Abstract in another language

Differential scanning calorimetry (DSC) is a well-established tool to analyze thermodynamic material properties. In conventional DSC devices, samples cannot be easily measured if they form corrosive or aggressive reaction (by-)products, because the highly complex and cost-intensive apparatuses may get contaminated or damaged. Furthermore, typical DSC devices are rather large stationary table-top units. They are not suitable for mobile usage. To allow for mobile DSC applications, and to measure aggressive materials, it was the objective of our work to develop a low-cost miniaturized all-ceramic differential scanning calorimeter device. An external furnace as it is today standard for table-top apparatuses can be avoided. The new device is manufactured fully in Low Temperature Co Fired Ceramics (LTCC) technology combined with thick film technology. The DSC chip arrangement consists of heater and temperature sensors that are integrated into a chemically inert ceramic monolith with a metallic heater, conductor tracks and temperature sensors. With this DSC chip setup, a high reproducibility was obtained. Owing to its low mass and good temperature control heating rates of over 500 K/min are possible. The integrated sensor can be easily replaced and it is available at low cost. In the talk, the steps of the development using the LTCC technology in combination with finite-element modelling are shown, starting from the initial setup to the recent final design. Some typical DSC-curves will be shown. They verify the applicability of the entire concept. Figure 1a is a scheme of the setup of the DSC chip sensor head, depicting the integrated temperature sensors, the centrally located heater, an internal reference, and a sample. From the temperature difference Δϑ during heating, the heat flow can be calculated. It leads to the thermodynamic data, e.g., to the melting enthalpy of the sample. Fig. 1b is a sketch of the setup in LTCC technology, and Fig. 1c is an image of the DSC chip. Figure 2 shows the operation of the device, with the steps a) adding a crucible with the sample onto the DSC chip that is installed in a sample holder and b) covered with a glass lid to avoid thermal fluctuations that may disturb the measurements. c) is an image of the entire DSC device with an apple for comparison of the size. Figure 3 is a typical calibration measurement (here with Indium) to verify that the determined melting enthalpy remains independent on the heating rate. Outlook: The next research step, focuses on the integration of a scale to allow for, e.g., determining mass losses during decomposition of polymers.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 27 Sep 2022 07:22
Last Modified: 27 Sep 2022 07:22
URI: https://eref.uni-bayreuth.de/id/eprint/71974