Interaction of photoswitchable nanoparticles with cellulosic materials for anticounterfeiting and authentication security documents. (15th February 2020)

• Record Type: Journal Article
• Authors: Abdollahi, Amin; Herizchi, Ata; Roghani-Mamaqani, Hossein; Alidaei-Sharif, Hossein
• Is Part Of: Carbohydrate polymers. Volume 230(2020)
• Publication Date: 2020-02-15
• Subjects: Latex nanoparticle -- Cellulosic papers -- Fluorescence -- Spiropyran -- Anticounterfeiting -- Print-marking -- Photo-patterning; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2019.115603
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Invisible high-security anticounterfeiting inks were prepared by surface-modification of functionalized latex nanoparticles with spiropyran derivatives, which display both photochromism (coloration to purple) and fluorescence emission (highly intense and luminous red color) upon UV irradiation at the same time. Highlights: Photochromic and fluorescent functional latex nanoparticles. Interactions of nanoparticles with cellulosic surface by hydrogen bonding. Print-marking of anticounterfeiting inks on cellulosic security documents. Fast and facile strategy for induction of security marks on cellulosic substrates. Abstract: Invisible high-security anticounterfeiting inks were developed by surface-modification of functionalized latex nanoparticles with spiropyran derivatives, which display both photochromism and fluorescence upon UV irradiation at the same time. The functionalized latex nanoparticles show different spherical, doughnut-like, and red blood cell-like morphologies depending on concentration and type of its functional groups. Microscopic investigation of the impregnated cellulosic papers with latex nanoparticles display that epoxy-functionalized spherical latex nanoparticles have considerable packing and stability on the surface of the cellulosic substrate by formation of hydrogen bonding. Epoxy-functionalized latex nanoparticles containing spiropyran were used for preparation of high-security photochromic/fluorescent anticounterfeiting inks for print-marking of different cellulosic security documents such as certificate, money, and passport with different marks. The printed marks and finger-prints on the cellulosic security documents display photochromism and red fluorescence emission upon UV irradiation with high intensity and brightness.