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

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Pinto, TV (Author) Other; Costa, P (Author) Other; Sousa, CM (Author) Other; Sousa, CAD (Author) Other; Clara Pereira (Author) FCUP; Silva, CJSM (Author) Other; Manuel Fernando R Pereira (Author) FEUP; Coelho, PJ (Author) Other; Cristina Freire (Author) FCUP

Journal

Title: ACS Applied Materials & Interfaces

Vol. 8

Pages: 28935-28945

ISSN: 1944-8244

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 47 Citations

Scopus - 52 Citations

Other information

Authenticus ID: P-00M-6N9

DOI: 10.1021/acsami.6b06686

Abstract (EN): 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 (Delta E-ab* = 39-52), despite presenting slower bleaching kinetics (2-3 h to fade to the original color), whereas the textiles coated with SiO2@S3 SiO2@S4 exhibited excellent engagement between coloration and decoloration rates (coloration and fading times of 1 and 2 min, respectively; Delta E-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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11