Fluorescence lifetimes in colled dye matrices

Theiss, F.-J.; Weber, J.

doi:10.1016/0030-4018(74)90121-7

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The epoxy-based adhesives are usually attractive for art conservation because of their glossiness and excellent adhesion strength . However, due to the colorless nature of the adhesives, it is very difficult to identify the repair work of an artifact . A suitable fluorescent adhesive can show a bright color under UV light but remains invisible in normal light to easily detect the joint without affecting its physical appearance (colorless).…”

Section: Introductionmentioning

confidence: 99%

“…2 However, due to the colorless nature of the adhesives, it is very difficult to identify the repair work of an artifact. 3 A suitable fluorescent adhesive can show a bright color under UV light but remains invisible in normal light to easily detect the joint without affecting its physical appearance (colorless). Several research groups formerly prepared fluorescent adhesives by incorporating small amounts of fluorescent dyes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Graphene Quantum Dots-Ornamented Waterborne Epoxy-Based Fluorescent Adhesive via Reversible Addition–Fragmentation Chain Transfer-Mediated Miniemulsion Polymerization: A Potential Material for Art Conservation

Samanta

Banerjee

Bhattacharya

et al. 2021

ACS Appl. Mater. Interfaces

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Epoxy-based adhesives have gotten significant attention in the conservation of antiquities and repair or reconstruction of artifacts due to their excellent adhesion strength. However, it has become hard to detect repaired work in artifacts due to the transparent nature of epoxy-based adhesives. Hence, the making of fluorescent adhesives has become an exciting topic for art conservators. Here, we have synthesized a new kind of waterborne epoxy-based fluorescent adhesive decorated with graphene quantum dots (GQDs) via reversible addition–fragmentation chain transfer (RAFT)-mediated surfactant-free miniemulsion polymerization. In this case, a new block copolymer (BCP), poly(1-vinyl-2-pyrrolidone)-block-poly(glycidyl methacrylate), has been synthesized via surfactant-free RAFT-mediated miniemulsion polymerization using a polymerization-induced self-assembly technique. The GQDs were prepared from citric acid by a hydrothermal process, and this was used for making a fluorescence-active BCP/GQD nanocomposite emulsion. The obtained BCP/GQD nanocomposite adhesive was transparent and showed blue fluorescence under ultraviolet–visible light, indicating the easy detection of its mark on the artifacts. The BCP and BCP/GQD emulsions were applied to adhere ceramic and glass substrates, and their adhesion strength was evaluated by lap shear tests. The BCP/GQDs showed better adhesion strength than the BCP only, indicating better adhesive performance. Additionally, the synthesis process was carried out in aqueous media, indicating the sustainability and environment-friendliness of the process. We believe that this kind of new waterborne epoxy-based fluorescent adhesive will provide a new contrivance among art conservators to repair or reconstruct artifacts.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Graphene Quantum Dots-Ornamented Waterborne Epoxy-Based Fluorescent Adhesive via Reversible Addition–Fragmentation Chain Transfer-Mediated Miniemulsion Polymerization: A Potential Material for Art Conservation

Samanta

Banerjee

Bhattacharya

et al. 2021

ACS Appl. Mater. Interfaces

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“…Bisphenol A based epoxies exhibit a slight innate fluorescence, , but it is not enough to be readily visible to the eye. However, the addition of small amounts of a fluorescent dye can make the epoxy fluoresce. − Noncovalently attached dyes can leach or be extracted from the resin attenuating or eliminating the fluorescent signature. In addition, leaching of dyes from the resins can potentially cause environmental or health problems.…”

Section: Introductionmentioning

confidence: 99%

UV Fluorescent Epoxy Adhesives from Noncovalent and Covalent Incorporation of Coumarin Dyes

McFadden

Frederick

Argüello

et al. 2017

ACS Appl. Mater. Interfaces

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Epoxies are commonly used in art conservation as adhesives for artifact reconstruction and repair. However, with the development of colorless epoxies, it has become more difficult to detect repair work. Fluorescent epoxies would allow for easy detection of the epoxy joints by simple visual inspection under UV light while remaining unnoticeable under normal display lighting. Coumarins are natural dyes that can be added in very small amounts to make thermosets fluoresce. Depending on the functionality of the coumarin used, the dye may be physically encapsulated in the cross-linked polymer or it may be bound to the polymer through covalent bonds. In this paper, we examine the efficacy of coumarin (1) and coumarin 480 (2) as physically encapsulated dyes and 7-hydroxycoumarin (3) and 7-glycidyloxycoumarin (4) as covalently bound dyes in a commercial epoxy thermoset, Epo-Tek 301. All four dyes could be used to make the epoxy fluorescent, but coumarins 1 and 2 slightly reduced the lap shear strength of the thermoset and could be extracted with solvent. In contrast, coumarins 3 and 4 had little effect on the mechanical properties of the epoxy and only minute amounts could be extracted.

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Intralayer and interlayer dimerization of rhodamine 6G in Langmuir-Blodgett films

et al. 1993

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Fluorescence lifetimes in colled dye matrices

Cited by 4 publications

References 3 publications

Graphene Quantum Dots-Ornamented Waterborne Epoxy-Based Fluorescent Adhesive via Reversible Addition–Fragmentation Chain Transfer-Mediated Miniemulsion Polymerization: A Potential Material for Art Conservation

Graphene Quantum Dots-Ornamented Waterborne Epoxy-Based Fluorescent Adhesive via Reversible Addition–Fragmentation Chain Transfer-Mediated Miniemulsion Polymerization: A Potential Material for Art Conservation

UV Fluorescent Epoxy Adhesives from Noncovalent and Covalent Incorporation of Coumarin Dyes

Intralayer and interlayer dimerization of rhodamine 6G in Langmuir-Blodgett films

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