A novel approach for engineering efficient nanofluids by radiolysis

• Published in: Scientific reports Vol. 12; no. 1; pp. 10767 - 12
• Main Authors: Maaza, M., Khamliche, T., Akbari, M., Kana, N., Tandjigora, N., Beukes, P., Genu, A., Kaviyarasu, K., K.Cloete, J., Lekala, M., Gibaud, A., Henini, M.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 24.06.2022; Nature Publishing Group; Nature Portfolio
• Subjects: 639/166; 639/301; 639/4077; 639/766; 639/925; Chemical reactions; Engineering; Fluids; Gamma rays; Heat conductivity; Heat transfer; Humanities and Social Sciences; Investigations; Metals; multidisciplinary; Nanoparticles; Radiolysis; Science; Science (multidisciplinary); Thermal conductivity
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-022-14540-z

This contribution reports for the first time the possibility of using radiolysis to engineer stable efficient nanofluids which exhibit an enhanced thermal conductivity. The validation was confirmed on Ag-H 2 O and Ag-C 2 H 6 O 2 nanofluids fabricated via g-radiolysis within the mild dose range of 0.95 × 10 3 –2.45 × 10 3 Gray. The enhanced thermal conductivity of Ag-H 2 O and Ag-C 2 H 6 O 2 nanofluids, was found to be g-radiations dose dependent. In the latter case of Ag-C 2 H 6 O 2 nanofluid, the relative enhancement in the temperature range of 25–50 °C was found to be 8.89%, 11.54%, 18.69%, 23.57% and 18.45% for D 1  = 0.95 × 10 3 Gray, D 2  = 1.2 × 10 3 Gray, D 3  = 1.54 × 10 3 Gray, D 4  = 1.80 × 10 3 Gray and D 5  = 2.45 × 10 3 Gray respectively. Yet not optimized, an enhancement of the effective thermal conductivity as much as 23.57% relatively to pure C 2 H 6 O 2 was observed in stable Ag-C 2 H 6 O 2 nanofluids. Equivalent results were obtained with Ag-H 2 O.