The authenticity of art: Analysis of the optical characteristics of paintings

Hwang, Seonhee; Kim, Eun‐Hee; Kim, Kyujung

doi:10.1109/cleopr.2015.7376475

Cited by 1 publication

(3 citation statements)

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“…This decrease is explained by a selective/differential photobleaching of the high-fluorescence-lifetime component. [38] The first point of deviation between the fluorescence lifetime measured in imaging and that measured in point mode occurred at approximately 60 min. With continued time and background polymerization reaction progress, the difference (marked as Δ) between the measurements from these two acquisition modes continued to increase.…”

Section: Resultsmentioning

confidence: 97%

“…A likely explanation was that Δ arises from selective photobleaching of high-fluorescence-lifetime fluorophores. [38] Alternative explanations (e.g., changes in aggregation-induced lifetime, [49][50][51] or changes in index of refraction), [52,53] however, could not currently be ruled out. These possibilities were examined in a control system, as will next be described.…”

Section: Resultsmentioning

confidence: 99%

“…To test the hypothesis that higher-lifetime fluorophores photobleached selectively [38] with 5, the fluorescence lifetime distributions were examined with and without photobleaching (low photon counts hindered this type of analysis in autofluorescent samples). Although the amount of photobleaching was relatively small in imaging mode compared to that in single-point mode, it was hypothesized that photobleaching that occurred while acquiring data in imaging mode might nevertheless be sufficient to indicate the presence (or absence) of selective photobleaching.…”

Section: Resultsmentioning

confidence: 99%

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A General Autofluorescence Method to Characterize Polymerization Progress

2023

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An autofluorescence technique to characterize polymerization progress in real time/in line was developed, which functioned in the absence of typical fluorogenic groups on the monomer or polymer. The monomer dicyclopentadiene and polymer polydicyclopentadiene are hydrocarbons that lack traditional functional groups for fluorescence spectroscopy. Here, the autofluorescence of formulations containing this monomer and polymer during ruthenium-catalyzed ring-opening metathesis polymerization (ROMP) was harnessed for reaction monitoring. The methods fluorescence recovery after photobleaching (FRAP) and here-developed fluorescence lifetime recovery after photobleaching (FLRAP) characterized polymerization progress in these native systems-without requiring exogenous fluorophore. (Auto)fluorescence lifetime recovery changes during polymerization correlated linearly to degree of cure, providing a quantitative link with reaction progress. These changing signals also provided relative rates of background polymerization, enabling comparison of 10 different catalyst-inhibitor-stabilized formulations. Multiple-well analysis demonstrated suitability for future high-throughput evaluation of formulations for thermosets. The central concept of the combined autofluorescence and FLRAP/FRAP method may be extendable to monitoring other polymerization reactions previously overlooked for lack of an obvious fluorescence handle.

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Section: Resultsmentioning

confidence: 97%