Publication Details (including relevant citation information):
“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.
Address (URL): http://pubs.acs.org/doi/abs/10.1021/acsami.6b06686