Examinando por Autor "Bou-Belda, Eva"

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Analysis of the influence of graphene and phase change microcapsules on thermal behavior of cellulosic fabrics
(Elsevier, 2020-12) Ruiz-Calleja, Tamara; Bonet-Aracil, Marilés; Gisbert-Payá, Jaime; Bou-Belda, Eva
Thermal management is a critical factor in several areas, such as architecture, computing, and transportation. Improving thermal regulation effectiveness is a challenging materials engineers. New materials can be used as thermoregulators sucha as graphene or Phase Change Materials (PCM). Textile engineering is also concerned and researchers are developing numerous advances for effective thermal control. In this investigation, we focus on finding new approaches for thermal regulation of cellulosic fabrics combining both technologies, phase change materials and graphene. For this purpose, we compare the thermal behavior of a cellulosic fabric when applying a coating paste containing graphene or phase change materials individually, finding that their performances are similar during heating. Likewise, the synergy produced by using both materials in the same coating paste is studied, proving that the action of graphene and PCM simultaneously allows the dissipation of more heat energy than when acting individually. These results open new paths of research on thermoregulation that may be useful in numerous applications beyond textiles.
Influence of fabric structure on electrical resistance of graphene-coated textiles
(Sage, 2022-09-07) Ruiz-Calleja, Tamara; Bonet-Aracil, Marilés; Gisbert-Paya, Jaime; Bou-Belda, Eva; Montava, Ignacio; Calderón-Villajos, Rocío
Coating is a widespread technique in the textile industry for different purposes, mainly in coloring and functional finishes. Graphene is usually applied to fabrics using coating techniques to provide such fabrics with properties like thermal or electrical conductivity. All woven fabrics have peaks and valleys in their structure, generated by the warp and weft threads interlacing. When spreading the graphene coating, the paste is placed in the fabric's interstices, and the connection between conductive particles is only produced when the height of the coating is sufficient to connect the different areas where it is deposited. This article analyzes three types of satin weave with three interlacing coefficients (0.4, 0.25, 0.17) and two sets of weft yarns each (20 and 71.43 tex). For a blade gap of 1.5 mm, the electrical resistance of samples with weft yarn count of 20 tex and interlacing coefficient of 0.4 is 534.33 Ω, while for IC = 0.25 electrical resistance is 36.8% higher and for IC = 0.17 this parameter increases 249.3%. For samples with weft yarn count of 71.43, the sample with IC = 0.40 exhibits an electrical resistance of 1053 Ω, for IC = 0.25 this value rises to 33.9% and for IC = 0.17 the electrical resistance value increases a total of 78.9%. This finding can be of interest for coatings where continuity is crucial, and for the application of substances that need to be protected from external factors, for which fabrics with deep interstices can be designed to house said products.
Thermoelectrical properties of graphene knife-coated cellulosic fabrics for defect monitoring in Joule-heated textiles
(Sage, 2022-01-05) Ruiz-Calleja, Tamara; Calderón-Villajos, Rocío; Bonet-Aracil, Marilés; Bou-Belda, Eva; Gisbert-Payá, Jaime; Jiménez-Suárez, Alberto; Prolongo, Silvia G
Knife-coating can confer new properties on different textile substrates efficiently by integrating various compounds into the coating paste. Graphene nanoplatelets (GNP) is one of the most used elements for the functionalization of fabrics in recent years, providing electrical and thermal conductivity to fabrics, later used to develop products such as sensors or heated garments. This paper reports thermoelectrically conductive textiles fabrication through knife-coating of cellulosic fabrics with a GNP load from 0.4 to 2 wt% within an acrylic coating paste. The fabric doped with the highest GNP content reaches a temperature increase of 100 ºC in few seconds. Besides, it is found out that the thermographic images obtained during the electrical voltage application provide maps of irregularities in the dispersion of conductive particles of the coating and defects produced throughout their useful life. Therefore, the application of a low voltage on the coated fabrics allows fast and effective heating by Joule’s effect, whose thermographic images, in turn, can be used as structural maps to check the quality of the GNP doped coating. The temperature values and the heating rate obtained make these fabrics suitable for heating devices, anti-ice and deice systems, and protective equipment, which would be of great interest for industrial applications.