Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 124, Issue 14, Pages 2914-2919Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.9b11622
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Funding
- National Institute of Standards and Technology grant for the Nanoscale investigations of the stress response of interphases project
- NIST Nanomanufacturing project
- Air Force Office of Scientific Research [F1ATA00236G002]
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We investigated a chemically modified rhodamine B dye as a sensor of local water content in dye-modified epoxy resins, where these measurements were combined with dielectric measurements to estimate the dye-water association ratio in the material. In particular, the water-sensitive fluorogenic dye was covalently attached to the epoxy resin backbone. This dye becomes fluorescent only upon photoactivation by ultraviolet light and its protonation in the presence of water. High-resolution noncontact microwave cavity dielectric measurements on these materials indicate a decrease of the dielectric permittivity upon photoactivation. We utilize this effect to determine the average extent of hydration of the activated dye molecules. Our results suggest that fluorogenic dyes are promising for the quantification of the local water content in polymer materials, such as the technologically important problem of interfacial water in epoxy materials.
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