Graphene coated cotton nonwoven for electroconductive and UV protection applications

2021 ◽  
pp. 152808372110592
Author(s):  
Vinit Kumar Jain ◽  
Arobindo Chatterjee
Keyword(s):  
Graphene Oxide ◽  
Breaking Strength ◽  
Nonwoven Fabric ◽  
Uv Protection ◽  
Batch Adsorption ◽  
Bending Rigidity ◽  
Protection Factor ◽  
Adsorption Studies ◽  
Bending Modulus ◽  
Coated Cotton

The functional properties and applications of graphene coated textiles depend on the magnitude of graphene add-on which in turn is influenced by the type of substrate and the dipping conditions. In the present study, optimized GO (graphene oxide) dipping conditions are identified for the preparation of cost-effective and scalable rGO (reduced graphene oxide) coated cotton nonwoven for electroconductive and UV (ultraviolet) blocking applications. To understand the influence of GO dipping variables on rGO add-on and electrical resistivity of cotton, batch adsorption studies are carried out in loose fibre form to eliminate the structural influence of yarn or fabric. Batch adsorption studies suggest that GO concentration, pH of GO solution and sodium dithionite (reductant) concentration are the most influencing dipping variables and these dipping variables are optimized for cotton nonwoven fabric using Box–Behnken response surface design to achieve minimum surface resistivity. The rGO coated cotton nonwoven fabric shows excellent UV blocking properties (UV protection factor = 89.38) at the optimized GO dipping conditions. Physical properties of cotton nonwoven fabric such as GSM, thickness, stiffness, breaking strength and elongation are analysed at different dipping cycles. After the rGO coating, bending rigidity, bending modulus and breaking elongation of the cotton nonwoven fabric decrease, whereas the breaking strength increases. rGO coated cotton fabric exhibits excellent stability towards multiple washing and rubbing. The graphene coated cotton is characterised by FT-IR, XRD, Raman, TGA, FESEM and LEICA image analyser.

scholarly journals Superflexibility of graphene oxide

2016 ◽  
Vol 113 (40) ◽  
pp. 11088-11093 ◽  
Author(s):  
Philippe Poulin ◽  
Rouhollah Jalili ◽  
Wilfrid Neri ◽  
Frédéric Nallet ◽  
Thibaut Divoux ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Unique Feature ◽  
Bending Rigidity ◽  
X Ray Diffraction ◽  
Synchrotron Source ◽  
X Ray ◽  
Bending Modulus ◽  
Bendable Electronics ◽  
Very High

Graphene oxide (GO), the main precursor of graphene-based materials made by solution processing, is known to be very stiff. Indeed, it has a Young’s modulus comparable to steel, on the order of 300 GPa. Despite its very high stiffness, we show here that GO is superflexible. We quantitatively measure the GO bending rigidity by characterizing the flattening of thermal undulations in response to shear forces in solution. Characterizations are performed by the combination of synchrotron X-ray diffraction at small angles and in situ rheology (rheo-SAXS) experiments using the high X-ray flux of a synchrotron source. The bending modulus is found to be 1kT, which is about two orders of magnitude lower than the bending rigidity of neat graphene. This superflexibility compares with the fluidity of self-assembled liquid bilayers. This behavior is discussed by considering the mechanisms at play in bending and stretching deformations of atomic monolayers. The superflexibility of GO is a unique feature to develop bendable electronics after reduction, films, coatings, and fibers. This unique combination of properties of GO allows for flexibility in processing and fabrication coupled with a robustness in the fabricated structure.

scholarly journals Electronic Textiles Fabricated with Graphene Oxide-Coated Commercial Textiles

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 489
Author(s):  
Hyun-Seok Jang ◽  
Min-Soo Moon ◽  
Byung-Hoon Kim
Keyword(s):  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Electronic Devices ◽  
Electronic Textiles ◽  
Axial Tension ◽  
Coated Cotton

Demand for wearable and portable electronic devices has increased, raising interest in electronic textiles (e-textiles). E-textiles have been produced using various materials including carbon nanotubes, graphene, and graphene oxide. Among the materials in this minireview, we introduce e-textiles fabricated with graphene oxide (GO) coating, using commercial textiles. GO-coated cotton, nylon, polyester, and silk are reported. The GO-coated commercial textiles were reduced chemically and thermally. The maximum e-textile conductivity of about 10 S/cm was achieved in GO-coated silk. We also introduce an e-textile made of uncoated silk. The silk-based e-textiles were obtained using a simple heat treatment with axial tension. The conductivity of the e-textiles was over 100 S/cm.

Laccase-catalyzed enzymatic dyeing of cotton fabrics

2021 ◽  
pp. 004051752110069
Author(s):  
Rıza Atav ◽  
Bürhan Buğdaycı ◽  
Ömer Bozkurt ◽  
Aylin Yıldız ◽  
Elçin Güneş ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Uv Protection ◽  
Infrared Analysis ◽  
Synthetic Dyes ◽  
Protection Factor ◽  
Knitted Fabrics ◽  
Reactive Dyeing ◽  
Dyeing Process ◽  
Laccase Enzyme ◽  
Color Reproducibility

As some synthetic dyes are regarded to be toxic, mutagenic and carcinogenic, the search for eco-friendly alternatives for the synthesis of dyes and coloration has gained importance. For this reason, this study focused on finding new eco-friendly alternatives for coloring cotton. 100% cotton knitted fabrics were subjected to enzymatic coloration using a commercial laccase enzyme and various precursors. After determining the colors, the effect of pH on the enzymatic dyeing process was investigated. Then the optimization of reaction conditions was also realized statistically for the precursors giving the best results in terms of color. With the aim of obtaining further improvements in color-yield values obtained in enzymatic dyeings, the effect of the pretreatment process and the use of ultrasound were also investigated. Furthermore, the reaction pathways in enzymatic coloration were explained and results were confirmed by means of Fourier Transformed Infrared analysis. As a result of experimental studies, red and lilac colors could be successfully obtained on cotton for the first time in the literature. In this way, the theoretical basis of enzymatic dye synthesis and dyeing of cotton was clarified comprehensively. Furthermore, technical (color reproducibility; washing, rubbing, light and perspiration-fastness values; and UV protection factor), economical (chemical, energy and water consumption required for dyeing (including aftertreatments) of 1 kg fabric) and ecological aspects of enzymatic dyeings were compared with reactive dyeing. According to the experimental results it was found that biological treatment alone was enough for wastewater of enzymatic coloring, while chemical treatment will also be needed in reactive dyeing wastewater. Furthermore, color reproducibility, evenness and UV protection properties of dyed samples were comparable with that of reactive dyeings. However, in terms of the fastness levels achieved, the enzymatic coloring was far behind the reactive dyeing.

One-step removal of insoluble oily compounds and water-miscible contaminants from water by underwater superoleophobic graphene oxide-coated cotton

Cellulose ◽  
2017 ◽  
Vol 24 (12) ◽  
pp. 5605-5614 ◽  
Author(s):  
Danning Zhu ◽  
Yunfei Xia ◽  
Jin Yang ◽  
Beibei Chen ◽  
Shun Guo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
One Step ◽  
Coated Cotton

scholarly journals Ultraviolet Protection by Fabric Engineering

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Mukesh Kumar Singh ◽  
Annika Singh
Keyword(s):  
Areal Density ◽  
Woven Fabrics ◽  
Uv Protection ◽  
Comfort Level ◽  
Protection Factor ◽  
Ultraviolet Protection Factor ◽  
Wear Comfort ◽  
Ultraviolet Protection ◽  
Multifilament Yarns ◽  
Fabric Structures

Background. The increasing emission of greenhouse gases has evoked the human being to save the ozone layer and minimize the risk of ultraviolet radiation (UVR). Various fabric structures have been explored to achieve desired ultraviolet protection factor (UPF) in various situations. Objective. In this study, the effect of various filament configurations like twisted, flat, intermingled, and textured in multifilament yarns on fabric in different combinations is assessed in order to engineer a fabric of better ultraviolet protection factor (UPF). Methods. In order to engineer a fabric having optimum UV protection with sufficient comfort level in multifilament woven fabrics, four different yarn configurations, intermingled, textured, twisted, and flat, were used to develop twelve different fabric samples. The most UV absorbing and most demanding fibre polyethylene terephthalate (PET) was considered in different filament configuration. Results. The combinations of intermingled warp with flat, intermingled, and textured weft provided excellent UVR protection comparatively at about 22.5 mg/cm2 fabric areal density. The presence of twisted yarn reduced the UV protection due to enhanced openness in fabric structure. Conclusion. The appropriate combination of warp and weft threads of different configuration should be selected judiciously in order to extract maximum UV protection and wear comfort attributes in multifilament woven PET fabrics.

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