Fractal modeling of polycrystalline PCMs

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00342989" target="_blank" >RIV/68407700:21110/20:00342989 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1063/5.0025697" target="_blank" >http://dx.doi.org/10.1063/5.0025697</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0025697" target="_blank" >10.1063/5.0025697</a>

Result language
angličtina
Original language name
Fractal modeling of polycrystalline PCMs
Original language description
We generate the grain size distribution for a material of a polycrystalline structure by a fractal modeling and use the results for theoretical predictions for peaks in the heat capacity vs. temperature plot. This is a continuation in our theoretical technique from which heat capacity peaks corresponding to first-order phase transitions can be obtained. In experiment the peaks are much broader and smaller in comparison with results of statistical mechanics for such transitions in macroscopic systems. However, we used the idea that, for a material composed of many grains, it is appropriate to apply the statistical mechanical results to the individual grains and then evaluate an average over all grains of various sizes. Then agreement between the theoretical and experimental results can be achieved. We illustrate the results of the fractal modeling for an example of pure alkane tricosane that undergoes a crystal to rotator phase transition at about 42.5 °C.
Czech name
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Czech description
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Project
<a href="/en/project/GA18-03997S" target="_blank" >GA18-03997S: Interior plasters with enhanced moisture accumulation capability</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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