The possibility of using composite fibers with phase change properties as a thermoregulating additive to dry building mixes (mortar mix) with the possibility of accumulating thermal energy under the action of sunlight and a high-frequency alternating magnetic field is studied. Composite fibers were obtained by adsorption of the organic phase-change material eicosane on fibers of microfibrillar cellulose modified with magnetite nanoparticles. The obtained composites demonstrated specific values of stored thermal energy in the range of 129-148 J/g, depending on the content of eicosane in their composition. It is shown that the addition of 10–15% wt. of composite fibers to the dry building mix makes it possible to store and release thermal energy in hardened samples in a temperature range of 27-43°C, corresponding to melting and crystallization of the eicosane in the structure of the composite fibers. It was shown that addition of the composites affects the dynamics of heating under the action of artificial sunlight and subsequent cooling: the samples with added fiber showed more intense heating and slower cooling compared with control samples when the temperature reached 35°C. Samples of the hardened mixture with addition of the composite fibers also exhibited the ability to accumulate thermal energy when exposed to a high-frequency alternating magnetic field with its subsequent sustained removal.
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The work was supported by the Russian Science Foundation, project No. 21-79-00176.
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 28–36 May – June, 2023
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Pirtsul, A.E., Mendgaziev, R.I., Komlev, A.S. et al. Composite Fibers with Phase-Change Properties as Thermoregulating Additives to Dry Mortar Mixes with the Possibility of Bimodal Heating. Chem Technol Fuels Oils 59, 449–458 (2023). https://doi.org/10.1007/s10553-023-01545-1
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DOI: https://doi.org/10.1007/s10553-023-01545-1