Ratiometric fuorescent probe based on non‑conjugated polymer dots for pH measurements in ordinary Portland cement‑based materials

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Journal:Microchimica Acta

Key Words:Organic fuorescent probe Cement leachate pH value In situ pH measurement

Abstract:An organic fuorescent probe, citric acid-1,3-Propanediamine-Rhodamine B (CPR) was synthesized to determine pH of ordinary Portland cement requiring only a small sample size (less than 500 μL cement leachate). The SEM, XRD, and FTIR investigations demonstrate that citric acid-1,3-Propanediamine are polymer dots with a fusiform structure. Ratio pH probe is constructed by rhodamine B with polymer dots, which exhibits a linear response in high alkaline range. A 6-fold increase in fuorescence intensity (455 nm) is achieved at pH from 12.00 to 13.25. Combined with measurements of the isothermal calorimeter, mineral composition, and microscopic morphology, variation of pH is used to evaluate the changes of components during hydration. Furthermore, CPR can be applied to measure pH of high-dose pulverized fuel ash blending systems, the non-pure cement with slightly lower alkalinity.

Indexed by:SCI

Translation or Not:no

Date of Publication:2023-03-08

Included Journals:SCI