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<p>Purpose – Personal thermal management by controlling the radiation energies of both the body and the suncan be used in all environments and contributes to sustainability components with the advantages of energysaving, low chemical usage and comfort enhancements under dynamic conditions. In this study, passiveradiative heating nanocomposite films were produced using sodium alginate as the matrix and zinc oxide (ZnO)and aluminum oxide (Al2O3) nanoparticles as nanofillers having far infrared radiation reflecting, hence passiveheating functions.Design/methodology/approach – Nanocomposite film solutions were prepared by stirring sodium alginatepowder, deionized water, ZnO and Al2O3 nanoparticles (20% wt of matrix polymer) with surfactant usingmagnetic and ultrasonic stirrers in turn. Films produced within Petri dishes after drying at room temperaturewere analyzed by FT-IR, UV-VIS-NIR spectroscopy and SEM for chemical, radiation management andmorphological characteristics, respectively. Emissivity values giving idea about the heating performances ofthe films were determined with an IR camera and a hotplate system. Moreover, direct heating performanceswere measured by the hotplate system including a far-infrared lamp.Findings – Results showed that the emissivity of the films increased by approximately 18% and 16% withZnO and Al2O3 nanoparticles, respectively. Moreover, NaAlg–Al2O3 nanocomposite film exhibited passiveradiative heating performance of 3.58 8C, higher than the heating performance of NaAlg–ZnO nanocompositefilm which is 2.97 8C when compared to the reference NaAlg film. These results indicate that both NaAlg–ZnOand especially NaAlg–Al2O3 nanocomposite films have excellent far-infrared emission and absorptionproperties ensuring a significant heating effect.Originality/value – In addition to other clothing types, the heating performance obtained with the producednanocomposite structures may be applied to different types of cosmetic/medical applications (beauty mask,wound dresses, etc.) enabling skincare/healing with the advantage of the sodium alginate matrix.<br></p> |
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