Keywords: nanodispersion, cerium oxide, heat conductivity, stability


The introduction of heat carriers progressive types causes the productivity of heat exchange systems to increase. One of the challenges in thermal applied applications is the search for heat carriers that will provide revolutionary indicators of thermal conductivity and stability over time, thereby increasing the order of the heat transfer processes efficiency magnitude. The paper describes the creation of stable colloidal solutions using cerium oxide and organic stabilizers to provide better heat exchange performance compared to true solutions. Cerium oxide colloids were obtained by precipitation of the oxide from an aqueous solution of cerium nitrate with an aqueous ammonia solution in the presence of a polymer under vigorous stirring at room temperature. A number of cerium oxide nanosized dispersions, stabilized with polyvinylpyrrolidone, with a particle size of 1–10 nm were obtained. The content of CeO2 in the obtained dispersions was 1.72.10–3, 5.15.10–3, 8.6.10–3, 1.21.10–2, 1.72.10–2  % at a polymer content of 1.10–3 mol/l, the pH of the dispersions was 8–9. Electron microscopic images of the obtained nanodispersions showed a colloidal particles narrow distribution and cerium oxide nanoparticles in size. Colloidal particles are macromolecular tangles of polyvinylpyrrolidone with oxide nanoparticles strung in them. A volume of 20–50 nm organic matrix contains 10–40 particles of 1–10 nm cerium oxide. The particle size distributions of the dispersions established by the photon-correlation spectroscopy method have two areas of maxima for each sample. The first maximum for the dispersions of all investigated concentrations refers to particles with a diameter of 5–6 nm, which, in our opinion, are particles of cerium oxide, both in polymer beads and probably free from the stabilizer. Another maximum, depending on the sample, is observed at 30–70 nm or 100–300 nm, and relates to colloidal particles of PVP with cerium oxide encapsulated particles. The static stability of the cerium oxide obtained nanodispersions with polyvinylpyrolidone for two years under standard conditions is comparable to the true polymer solution. It is proposed by the method of UV spectroscopy to control the reproducibility of the obtaining materials technology. Tests of the thermal conductivity of the obtained 1.72.10–3 % stable cerium oxide nanodispersion were performed at 50 °C relative to distilled water with a thermal conductivity coefficient of 0.65 W/(m·deg). We found an increase in the coefficient for nanodispersions by 4–6 %, which is a significant value for dilute solutions. Ref. 15, Fig. 4 .

Author Biographies

S.Ya. Brychka, The Gas Institute of the National Academy of Sciences of Ukraine, Kyiv

Doctor of Technical Sciences

B.I. Bondarenko, The Gas Institute of the National Academy of Sciences of Ukraine, Kyiv

Academician of NAS of Ukraine, Doctor of Technical Sciences, Professor


Alberola J.A., Mondragon R., Julia J.E., Hernandez L., Cabedo L. Characterization of halloysite-water nanofluid for heat transfer applications. Applied clay science. 2014. Vol. 99. pp. 54–61.

Brichka S.Ya. [Chemistry of halloysite and imogolitee nanotubes]. Kiev : Kyiv, 2016. 258 pp. (Rus.)

Fan J., Wang L.Q. Review of heat conduction in nanofluids. J. Heat Transfer Trans. 2011. Vol. 133. pp. 1–14.

Ambreen T., Kim M. Influence of particle size on the effective thermal conductivity of nanofluids : A critical review. Applied Energy. 2020. Vol. 264. pp. 75–96.

Saidur R., Leong, K.Y., Mohammad H.A. A review on applications and challenges of nanofluids. Renew. Sustain. Energy Rev. 2011. Vol. 15. pp. 1646–1668.

Mondragon R., Segarra C., Martinez-Cuenca R., Julia J.E., Jarque J.C. Experimental characterization and modeling of thermophysical properties of nanofluids at high temperature conditions for heat transfer applications. Powder Technol. 2013. Vol. 249. pp. 516–529.

Putnam S.A., Cahill D.G., Braun P.V., Ge Z.B., Shimmin R.G. Thermal conductivity of nanoparticle suspensions. J. Appl. Phys. 2006. Vol. 99. pp. 84–108.

Choi S.U.S., Zhang Z.G., Yu W., Lockwood F.E., Grulke E.A. Anomalous thermal conductivity enhancement in nanotube suspensions. Appl. Phys. Lett. 2001. Vol. 79. pp. 2252–2254.

Brichka S.Ya. [Chemistry of imogolite nanotubes. Part 1. Synthesis and structure]. Catalysis and petrochemicals. 2010. No. 18. pp. 58–66. (Rus.)

Esfe M.H., Kamyab M.H., Valadkhani M. Application of nanofluids and fluids in photovoltaic thermal system: An updated review. Solar Energy. 2020. Vol. 199. pp. 796–818.

Zayed M.E., Zhao J., Du Y., Kabeel A.E., Shalaby S.M. Factors affecting the thermal performance of the flat plate solar collector using nanofluids : A review. Solar Energy. 2019. Vol. 18. pp. 382–396.

Bahiraei M., Heshmatian S. Electronics cooling with nanofluids: A critical review. Energy Conversion and Management. 2018. Vol. 172. pp. 438–456.

Sajid M.U., Ali H.M. Recent advances in application of nanofluids in heat transfer devices: A critical review. Renewable and Sustainable Energy Reviews.. 2019. Vol. 10. pp. 556–592.

Brichka S.Ya., Brichka A.V., Chernyavskaya T.V., Kotel L.Yu. [Modification of aluminosilicate nanotubes with cerium dioxide]. Ukrainian Chemical Journal. 2013. 79 (6). pp. 97–100. (Rus.)

Salman S., Talib A.R.A., Saadon S., Sultan M.T.H. Hybrid nanofluid flow and heat transfer over backward and forward steps : A review. Powder Technology. 2020. Vol. 36. pp. 448–472.

How to Cite
Brychka, S., & Bondarenko, B. (2020). MAINTAINING STABLE NANODISPERSED CERIUM OXIDE FOR HEAT TRANSFER PROCESSES. Energy Technologies & Resource Saving, (2), 36-42.
Thermophysical basics of energy processes

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