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

Ning Du; Guohui Zhang; Pengkun Hou; Hao Zhang; Ruifang Guan

doi:10.1007/s00604-023-05691-5

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

Mikrochim Acta. 2023 Mar 8;190(4):119. doi: 10.1007/s00604-023-05691-5.

Authors

Ning Du¹, Guohui Zhang¹, Pengkun Hou¹, Hao Zhang², Ruifang Guan³

Affiliations

¹ School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China.
² Research Institute of Polymer Materials, School of Materials Science and Engineering, Shandong University, Jinan, 250061, China.
³ School of Materials Science and Engineering, University of Jinan, Jinan, 250022, Shandong, China. mse_guanrf@ujn.edu.cn.

PMID: 36884099
DOI: 10.1007/s00604-023-05691-5

Abstract

An organic fluorescent 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 fluorescence 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.

Keywords: Cement leachate; In situ pH measurement; Organic fluorescent probe; pH value.

Abstract

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