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dc.contributor.authorGuirado Moreno, José Carlos
dc.contributor.authorGuembe García, Marta
dc.contributor.authorGarcía Pérez, José Miguel 
dc.contributor.authorAguado, Roberto
dc.contributor.authorValente, Artur J. M.
dc.contributor.authorVallejos Calzada, Saúl 
dc.date.accessioned2022-01-26T13:04:02Z
dc.date.available2022-01-26T13:04:02Z
dc.date.issued2021-12
dc.identifier.issn1944-8244
dc.identifier.urihttp://hdl.handle.net/10259/6360
dc.description.abstractThe synthesis and preparation of 12 chromogenic polymers used to build an intelligent label for security paper applications are described. The process involves coating paper sheets with the polymers. Depending on the number of different polymers used in a combinatory way, a maximum of 1212 combinations is possible, thus creating a matrix that is practically impossible to counterfeit. Currently, most anticounterfeiting proposals for paper-based packaging and documents involve some sort of verification under ultraviolet radiation, and the requirement of additional equipment often relegates the end-user to a passive role. In contrast, in our approach, the combination of sensory polymers in an array gives rise to an invisible label, i.e., an owner cryptographic key, which becomes visible upon scattering a nitrite solution (e.g., spraying or using an impregnated foam roller) over the printed label on the security paper. For this purpose, a monomer containing an aromatic primary amino group and another with an activated aromatic ring are covalently bonded to a polymer with high affinity toward paper, consisting essentially of units of methyl methacrylate and 1-vinyl-2-pyrrolidone. Subsequently, the paper samples are coated with the resulting sensory chromogenic polymer. By spraying, painting, or staining an aqueous acid solution of NaNO2 (at least 1.20 g/L) and the chromogenic polymers, a well-defined color appears, because of the formation of an azo compound. This process provides users with a quick and facile authentication method without additional equipment and without affecting paper strength.en
dc.description.sponsorshipS.V. received funding from “La Caixa” Foundation (Grant No. LCF/PR/PR18/51130007). J.M.G. received funding from “Spanish Agencia Estatal de Investigación “ Grant No. PID2020-113264RB-I00/AEI/10.13039/ 501100011033. A.V. received funding from Portugal 2020 in the frame of COMPETE 2020 No. 246/AXIS II/2017 (Project No. 21874). We also gratefully acknowledge European Regional Development Fund (ERDF).en
dc.format.mimetypeapplication/pdf
dc.language.isoenges
dc.publisherAmerican Chemical Societyen
dc.relation.ispartofACS Applied Materials & Interfaces. 2021, v. 13, n. 50, p. 60454–60461en
dc.rightsAtribución 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectAnticounterfeiten
dc.subjectPapersen
dc.subjectAzo-couplingen
dc.subjectSensory polymersen
dc.subjectColorimetryen
dc.subjectRGB parametersen
dc.subject.otherQuímica orgánicaes
dc.subject.otherChemistry, Organicen
dc.titleChromogenic Anticounterfeit and Security Papers: An Easy and Effective Approachen
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.relation.publisherversionhttps://doi.org/10.1021/acsami.1c19228es
dc.identifier.doi10.1021/acsami.1c19228
dc.identifier.essn1944-8252
dc.journal.titleACS Applied Materials & Interfacesen
dc.volume.number13es
dc.issue.number50es
dc.page.initial60454es
dc.page.final60461es
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones


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