Textiles screen‐printed with photochromic ethyl cellulose–spirooxazine composite nanoparticles |
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| Authors: | Tivadar Feczkó Krisztián Samu Klára Wenzel Branko Neral Bojana Voncina |
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| Affiliation: | 1. Institute of Materials and Environmental Chemistry, Research Center for Natural Sciences, Hungarian Academy of Sciences, Pusztaszeri u. 59‐67, H‐1025 Budapest, Hungary
Email: tivadar.feczko@gmail.com;2. Research Institute of Chemical and Process Engineering, Faculty of Information Technology, University of Pannonia, Egyetem u. 10, Veszprém 8200, Hungary;3. Department of Mechatronics, Optics and Engineering Informatics, Faculty of Mechanical Engineering, Budapest University of Technology and Economy, M?egyetem rkp. 3‐9, H‐1111 Budapest, Hungary;4. Institute of Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, Smetanova Ulica 17, SI‐2000 Maribor, Slovenia |
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| Abstract: | Photochromic compounds change colour on exposure to light, while the reversion may be attributable either to radiation or may be thermal. The use of photochromism on fabrics can provide new opportunities to develop smart textiles; for example, sensors and active protective clothes. Ethyl cellulose‐1,3‐dihydro‐1,3,3,4,5 (and 1,3,3,5,6) ‐pentamethyl‐spiro‐[2H‐indole‐2,3′‐(3H)naphtha(2,1‐b)(1,4)oxazine] composites were prepared by an oil‐in‐water emulsion, solvent evaporation method in order to form easily suspendable and fatigue‐resistant photochromic nanoparticles in screen‐printing paste. Their size was well below 1 μm and did not change substantially over a wide range of dye concentrations. After screen‐printing, a homogenous photochromic layer was built on a cotton substrate surface, which represented substantial blue colour development in CIELab colour space measurements because of ultraviolet light, even at a dye concentration of 0.045% w/w. The addition of a photodegradation inhibitor, Tinuvin 144, further increased the coloration of the printed fabric. |
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