Abstract
Measurements of proton nuclear spin-spin and spin-lattice relaxation times are applied for determining the concentration of solid-phase nanoparticles in nanofluids. This approach is tested for metal oxides SiO2, TiO2, Al2O3 and metal-carbon nanoparticles of 3d-metals Fe and Cu. It is shown that the sensitivity of the method for determining concentrations of 3d-metals is much higher than for oxides (by 2–4 orders of magnitude). It is revealed that measurement of the proton spin-spin relaxation time allows one to determine the concentration of Cu nanoparticles to 0.0001 mg/ml and that of Fe nanoparticles to 0.00001 mg/ml.
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Bagryanskaya, E.G., Krumkacheva, O.A., Belikov, A.E. et al. The influence of Fe, Cu, SiO2, TiO2, and Al2O3 nanoparticles in aqueous solution on proton relaxation times. J. Engin. Thermophys. 20, 55–63 (2011). https://doi.org/10.1134/S181023281101005X
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DOI: https://doi.org/10.1134/S181023281101005X