Investigation on Stability and Optical Properties of Titanium Dioxide and Aluminum Oxide Water-Based Nanofluids
- 293 Downloads
Water is regarded as a poor absorber of solar energy. This affects the efficiency of solar thermal systems. The addition of nanoparticles to heat transfer fluids used in solar thermal systems can enhance their optical properties. These new-generation heat transfer fluids are known as nanofluids. The present study investigates the stability and optical properties of three nanofluids, including aluminum oxide (13 nm and <50 nm) and titanium dioxide (21 nm) nanofluids. The stability of the nanofluids was observed through a photo-capturing method and zeta potential measurements. Ultraviolet–visible (UV–Vis) spectrophotometer was used to measure the absorbance and transmittance of the prepared nanofluids. The effect of factors such as type of particle, type of surfactant, and pH of the solution on the optical properties of the nanofluids was also investigated. We found that the titanium dioxide nanofluid had better optical properties but lower stability compared to aluminum oxide nanofluids.
KeywordsAluminum oxide Nanofluids Optical properties Stability Surfactant Titanium dioxide
The authors would like to acknowledge the Ministry of Higher Education, Malaysia, and Universiti Pertahanan Nasional Malaysia for their financial support under FRGS/2/2014/TK01/UPNM/03/1.
- 11.A. Ghadimi, R. Saidur, H.S.C. Metsalaar, Renew. Sust. Energy Rev. 54, 4051 (2011)Google Scholar
- 16.Babita, S.K. Sharma, S.M. Gupta, Exp. Therm. Fluid Sci. 79, 202 (2016)Google Scholar
- 18.R.S. Khedkar, N. Shrivastava, S.S. Sonawane, K.L. Wasewar, Int. Commun. Heat Mass Transf. 73, 54 (2016)Google Scholar
- 21.M.H. Sajid, Z. Said, R. Saidur, F.R.M. Adikan, M.F.M. Sabri, N.A. Rahim, Int. Commun. Heat Mass Transf. 50, 108 (2014)Google Scholar
- 26.Sigma Aldrich, Titanium IV Oxide. http://www.sigmaaldrich.com/catalog/product/aldrich/718467?lang=en®ion=MY. Accessed 15 Jan 2017
- 27.D.D.L Chung, Carbon Composites, Composites with Carbon Fibers, Nanofibers and Nanotubes, 2nd edn. (Elsevier, Oxford , 2017), pp. 517Google Scholar
- 28.Glass & Glazing Association of Australia (AGGA), Technical Data Sheet, Solar Spectrum Technical Fact Sheet Solar Spectrum. https://www.agga.org.au/technical/technical-fact-sheets. Accessed 15 Jan 2017
- 29.L. Vandsburger, Synthesis and Covalent Surface Modification of Carbon Nanotubes for Preparation of Stabilized Nanofluid Suspensions (M.Eng.McGill University, Montreal, 2009)Google Scholar
- 31.Z. Said, M.H. Sajid, R. Saidur, G.A. Mahdiraji, N.A. Rahim, Numer. Heat Tranf. A Appl. 67, 1 (2015)Google Scholar