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Article

Sandwich Structures Reflecting Thermal Radiation Produced by the Human Body

by
Jiří Militký
1,
Dana Křemenáková
1,
Mohanapriya Venkataraman
1,*,
Josef Večerník
2,
Lenka Martínková
3 and
Jan Marek
3
1
Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, 461 17 Liberec, Czech Republic
2
Večerník s.r.o., 468 21 Alšovice, Czech Republic
3
Inotex, s.r.o., 544 01 Dvůr Králové nad Labem, Czech Republic
*
Author to whom correspondence should be addressed.
Polymers 2021, 13(19), 3309; https://doi.org/10.3390/polym13193309
Submission received: 25 August 2021 / Revised: 21 September 2021 / Accepted: 24 September 2021 / Published: 28 September 2021
(This article belongs to the Special Issue Hybrid Polymer-Inorganic Nanocomposite)

Abstract

Far infrared (FIR) textiles are a new category of functional textiles that have presumptive health and well-being functionality and are closely related to human thermo-physiological comfort. FIR exerts strong rotational and vibrational effects at the molecular level, with the potential to be biologically beneficial. In general, after absorbing either sunlight or heat from the human body, FIR textiles are designed to transform the energy into FIR radiation with a wavelength of 4–14 μm and pass it back to the human body. FIR textiles can meet increased demand for light, warm, comfortable, and healthy clothing. The main aim of this research is to describe the procedure for creating the FIR reflective textile layer as part of multilayer textile structures that have enhanced thermal protection. To develop the active FIR reflecting surface, the deposition of copper nanolayer on lightweight polyester nonwoven structure Milife, which has beneficial properties of low fiber diameters, good shape stability and comfort, was used. This FIR reflective layer was used as an active component of sandwiches composed of the outer layer, insulation layer, active layer, and inner layer. The suitable types of individual layers were based on their morphology, air permeability, spectral characteristics in the infra-red region, and thermal properties. Reflectivity, transmittance, and emissivity were evaluated from IR measurements. Human skin thermal behavior and the prediction of radiation from the human body dependent on ambient conditions and metabolic rate are also mentioned. The FIR reflective textile layer created, as part of multilayer textile structures, was observed to have enhanced thermal protection.
Keywords: sandwich structures; far-infrared; functional fabrics; Milife; composite non-woven sandwich structures; far-infrared; functional fabrics; Milife; composite non-woven
Graphical Abstract

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MDPI and ACS Style

Militký, J.; Křemenáková, D.; Venkataraman, M.; Večerník, J.; Martínková, L.; Marek, J. Sandwich Structures Reflecting Thermal Radiation Produced by the Human Body. Polymers 2021, 13, 3309. https://doi.org/10.3390/polym13193309

AMA Style

Militký J, Křemenáková D, Venkataraman M, Večerník J, Martínková L, Marek J. Sandwich Structures Reflecting Thermal Radiation Produced by the Human Body. Polymers. 2021; 13(19):3309. https://doi.org/10.3390/polym13193309

Chicago/Turabian Style

Militký, Jiří, Dana Křemenáková, Mohanapriya Venkataraman, Josef Večerník, Lenka Martínková, and Jan Marek. 2021. "Sandwich Structures Reflecting Thermal Radiation Produced by the Human Body" Polymers 13, no. 19: 3309. https://doi.org/10.3390/polym13193309

APA Style

Militký, J., Křemenáková, D., Venkataraman, M., Večerník, J., Martínková, L., & Marek, J. (2021). Sandwich Structures Reflecting Thermal Radiation Produced by the Human Body. Polymers, 13(19), 3309. https://doi.org/10.3390/polym13193309

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