Clara Pereira - Screen-Printed Photochromic Textiles through New Inks Based on SiO2@naphthopyran Nanoparticles

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      “Screen-Printed Photochromic Textiles through New Inks Based on SiO2@Naphthopyran Nanoparticles", Tânia V. Pinto, Paula Costa, Céu M. Sousa, Carlos A. D. Sousa, Clara Pereira*, Carla J. S. M. Silva, Manuel Fernando R. Pereira, Paulo J. Coelho, Cristina Freire, ACS Applied Materials & Interfaces2016,8, 28935−28945. DOI: 10.1021/acsami.6b06686

        * Corresponding author


      Photochromic silica nanoparticles   (SiO2@NPT), fabricated through the   covalent immobilization of silylated naphthopyrans (NPTs) based   on 2H-naphtho[1,2-b]pyran (S1,   S2) and 3H-naphtho[2,1-b]pyran   (S3, S4) or through the direct   adsorption of the parent naphthopyrans (1,   3) onto silica nanoparticles (SiO2  NPs), were successfully incorporated onto cotton fabrics by a   screen-printing process. Two aqueous acrylic- (AC-) and   polyurethane- (PU-) based inks were used as dispersing media. All   textiles exhibited reversible photochromism under UV and solar   irradiation, developing fast responses and intense coloration.   The fabrics coated with SiO2@S1 and   SiO2@S2 showed rapid color changes   and high contrasts (ΔE*ab = 39–52), despite   presenting slower bleaching kinetics (2–3 h to fade to the   original color), whereas the textiles coated with   SiO2@S3 and   SiO2@S4 exhibited excellent   engagement between coloration and decoloration rates (coloration   and fading times of 1 and 2 min, respectively;   ΔE*ab = 27–53). The PU-based fabrics showed   excellent results during the washing fastness tests, whereas the   AC-based textiles evidenced good results only when a protective   transfer film was applied over the printed design.

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