期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 42, 页码 28935-28945出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06686
关键词
silica nanoparticles; naphthopyrans; photochromism; screen-printing; smart textiles
资金
- Fundacao para a Ciencia e a Tecnologia (FCT)/MEC under FEDER [UID/QUI/50006/2013-POCI/01/0145/FEDER/007265 UID/EQU/50020/2013-POCI-01-0145-FEDER-006984]
- Fundacao para a Ciencia e a Tecnologia (FCT)/MEC [PTDC/CTM-POL/0813/2012]
- FCT [SFRH/BD/89076/2012, SFRH/BD/75930/2011, SFRH/BPD/80100/2011, IF/01080/2015]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/75930/2011, PTDC/CTM-POL/0813/2012, SFRH/BD/89076/2012] Funding Source: FCT
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.
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