**5. Conclusions**

A comparative study for silver and gold nanoparticles was comprehensively carried out to form a thin and shiny metallic layer over the surface of a rotating disk via spin coatings. Moreover, a detailed analysis of nanofluids suspended with four different types of base fluids, namely water, ethanol, methanol and ethylene-glycol has also been examined under the assumptions of nanofluids to be diluted and non-volatile. Finally, a parametric study on the basis of obtained expressions of results was made to apprehend the effects of the main parameters involved. Some significant findings are enlisted below:


**Author Contributions:** Supervision, R.E.; Investigation, A.Z.; Methodology, F.H.; Writing-Review & Editing, T.A.

**Funding:** This research received no external funding.

**Acknowledgments:** F. Hussain gratefully thanks to FBAS to provide him administrative and technical support during his stay at IIUI as HEC indigenous scholar for the pursuance of his Ph.D. studies.

**Conflicts of Interest:** The authors declare no conflict of interest.
