Zeta Potentials of Magnetite Particles and Alloy 690 Surfaces in Alkaline Solutions
Abstract
:1. Introduction
2. Experimental
2.1. Zeta Potential Measurement
2.2. Surface Zeta Potential Measurement
3. Results and Discussion
3.1. Effect of pH Control Agents
3.2. Effect of NaCl Addition
4. Conclusions
- The empirical formulas for the zeta potentials of magnetite nanoparticles derived in the pH range from 9.0 to 10.0 at 25 °C were as follows: for ETA; for ammonia; for morpholine.
- The zeta potentials of the magnetite nanoparticles increased in the negative direction as the pH increased from 9.0 to 10.0, regardless of the pH agent. This result indicates that as the pH increases, the repulsive force between the particles increases, thereby leading to an increase in the dispersion stability. At the same pH value, the absolute value of the zeta potential increased in the order: ETA < ammonia < morpholine, meaning that the dispersion stability of the particles also increases in the same order.
- The difference in the zeta potentials between the magnetite nanoparticles and Alloy 690 surfaces increased with increasing pH from 9.0 to 10.0, regardless of the pH agent. At the same pH value, the difference was the largest in ammonia. From these results, it is expected that the amount of magnetite deposited on the Alloy 690 surfaces will decrease as the pH increases from 9.0 to 10.0, and will be the smallest in the ammonia.
- The zeta potentials of magnetite nanoparticles increased in the negative direction by the addition of NaCl. In addition, the difference in the zeta potentials between the magnetite nanoparticles and Alloy 690 surfaces increased by approximately three times by the addition of NaCl. These results suggest that NaCl plays a role in increasing the repulsive force between the particles and Alloy 690 surfaces.
Author Contributions
Funding
Conflicts of Interest
References
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pH Control Agents | Chemical Formula | Density (g/cm3) | Boiling Point (°C) | Molar Mass (g/mol) |
---|---|---|---|---|
Ammonia solution, 30% | NH3+H2O | 0.89 | 36 | 17.0 |
Morpholine | C4H9NO | 1.01 | 129 | 87.1 |
Ethanolamine (ETA) | C2H7NO | 1.01 | 170 | 61.1 |
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Lee, J.-M.; Lim, D.-S.; Jeon, S.-H.; Hur, D.H. Zeta Potentials of Magnetite Particles and Alloy 690 Surfaces in Alkaline Solutions. Materials 2020, 13, 3999. https://doi.org/10.3390/ma13183999
Lee J-M, Lim D-S, Jeon S-H, Hur DH. Zeta Potentials of Magnetite Particles and Alloy 690 Surfaces in Alkaline Solutions. Materials. 2020; 13(18):3999. https://doi.org/10.3390/ma13183999
Chicago/Turabian StyleLee, Ji-Min, Dong-Seok Lim, Soon-Hyeok Jeon, and Do Haeng Hur. 2020. "Zeta Potentials of Magnetite Particles and Alloy 690 Surfaces in Alkaline Solutions" Materials 13, no. 18: 3999. https://doi.org/10.3390/ma13183999