A differential heat-conduction microcalorimeter for heat-capacity measurements of fluids |
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| Institution: | 1. Université de Guyane, IRD, UMR ESPACE-DEV, F97300 Cayenne, Guyane;2. Centre for Agroecology, Water and Resilience, Coventry University, UK;3. African Climate & Development Initiative, University of Cape Town, Cape Town, South Africa;4. Department of Oceanography, MARE Institute, University of Cape Town, Cape Town, South Africa;5. Université Grenoble Alpes, LTHE UMR 5564, BP 53, 38041 Grenoble, France;6. IRD, LTHE UMR 5564, 38041 Grenoble, France;7. CNRS, LTHE UMR 5564, 38041 Grenoble, France;8. Université Félix Houphouët Boigny, UFR SSMT/LAPA-MF, Abidjan, Ivory Coast;9. SODEXAM, Meteorological Dept., 15 BP 990, Abidjan, Ivory Coast;10. Niger Meteorological Office, BP., 218, Niamey, Niger;11. Centre Régional AGRHYMET/CILSS, BP, 11011, Niamey, Niger;12. University Abdou Moumouni, Niamey, Niger;13. Addis Ababa Univ., Physics Department, Arat Kilo Campus, Addis Ababa, Ethiopia;14. Université AssaneSeck of Ziguinchor, BP 523, Ziguinchor, Senegal;15. ANACIM, Météorological Dept., BP 8257, Dakar-Yoff, Dakar, Senegal;p. Université Cheikh Anta Diop of Dakar, ESP/LPAOSF, Dakar, Senegal;q. Muséum National d''Histoire Naturelle, UMR 208 PALOC, Paris, France;1. Department of Geosciences, Idaho State University, Pocatello ID83209-8072, USA;2. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China;3. Department of Civil and Environmental Engineering, University of Nevada, Las Vegas NV89054-1087, USA;4. Department of Watershed Sciences, Utah State University, Logan UT84322-5210, USA;1. State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China;2. Joint Center for Global Change Studies, Beijing, China;3. ESSIC and Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, USA |
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| Abstract: | A heat-conduction calorimeter has been developed for measuring small changes in heat capacity of milligram samples of membrane lipid dispersed in water as a function of temperature. The operation of the instrument is based on the principle that the thermal response of the sample to a short (10 s), electrically generated heat burst is a function of the diffusivity of the sample. Modeling studies of the instrument's performance have revealed that the output response after the heat burst is a function of only the heat capacity, ϱCp. Calibration of the instrument experimentally confirmed this behavior. This feature obviated the need to measure the thermal conductivity in order to determine ϱCp from the diffusivity equation, η = γ/ϱCp. The calorimeter has the following characteristics: reproducibility of loading: ± 400 μJ/C° · cm3; baseline stability: ± 10 μJ/C° · cm3 per 36 h; resolution (± 1 S.D.): ± 50 μJ/C° · cm3; sample size 600 μl. |
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