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The Experimental Ph...
The Experimental Phase Diagram Study of the Binary Polyols System Erythritol-Xylitol
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- Gunasekara, Saman Nimali, 1982- (författare)
- KTH,Kraft- och värmeteknologi,Thermal Energy Storage (TES)
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- Chiu, Justin NingWei, 1984- (författare)
- KTH,Kraft- och värmeteknologi,Thermal Energy Storage
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- Martin, Viktoria (författare)
- KTH,Kraft- och värmeteknologi,Thermal Energy Storage (TES)
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- Hedström, Peter (författare)
- KTH,Materialvetenskap
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(creator_code:org_t)
- Elsevier, 2017
- 2017
- Engelska.
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Ingår i: Solar Energy Materials and Solar Cells. - : Elsevier. - 0927-0248 .- 1879-3398. ; 174, s. 248-262
- Relaterad länk:
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https://kth.diva-por... (primary) (Raw object)
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http://kth.diva-port...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A comprehensive phase diagram for the binary polyols system erythritol-xylitol has been mapped with a transparent characterization approach. Here, the phase equilibrium of the system has been studied experimentally using a combination of methods: Temperature-history (T-history), X-Ray Diffraction (XRD), and Field-Emission Scanning Electron Microscopy (FESEM), and linked to Tammann plots. Existing literature has previously shown the system to be a non-isomorphous type forming a simple eutectic, by combining experimental data with theoretical modelling. The present investigation shows that the system’s phase diagram is a partially isomorphous type forming a eutectic, but not a non-isomorphous type forming a simple eutectic. Here, the eutectic was found within 25-30 mol% erythritol and at 77 °C, which differs from the previous studies identifying the eutectic respectively at 25 or 36 mol% erythritol and at 82 °C. The reasons for the differences are hard to deduce since the research approach is not presented as fully transparent from the past studies. In the present study, only the temperature-composition plot of the first melting (of the two components in a physical mix, but not of a single blend) indicated the shape of a simple eutectic in a non-isomorphous system. The cycles after the first melting in contrast started from the real blend, and displayed eutectic and solid-solid phase changes in T-history. These were verified as forming solid solutions with XRD and FESEM. This eutectic melts at a temperature suitable for low-temperature solar heating, but displayed glass transition, supercooling, and thermally activated degradation, thus affecting its practical aspects as a PCM.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Energisystem (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Energy Systems (hsv//eng)
Nyckelord
- Phase change material (PCM)
- Erythritol-Xylitol phase diagram
- Temperature-history (T-history) method
- X-ray diffraction (XRD)
- Field-emission scanning electron microscopy (FESEM)
- Eutectic
- Energy Technology
- Energiteknik
- Teknisk materialvetenskap
- Materials Science and Engineering
- Chemical Engineering
- Kemiteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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