Actually, I am working on different kinds of nanofluids and their characteristics, when we apply them in heat exchangers. But I didn't find any kind of elaborate dataset about MgO nanofluids.
Dear Turjo Ghoshal thank you for asking this interesting technical question. Please note that I'm not a proven expert in this field. However, I can suggest to you a few potentially useful references which might help you in your analysis. Please have a look e.g. at the following articles:
Modeling and estimation of thermal conductivity of MgO–water/EG (60:40) by artificial neural network and correlation
An updated review of nanofluids in various heat transfer devices
Article An updated review of nanofluids in various heat transfer devices
The last article is freely available as public full text on RG.
I suggest that you also use the "Search" function of RG to find and access other useful paper on this topic. Just search for "MgO nanofluid" and then click on "Publications":