Effect of Wettability on Micro- and Nanostructure Surface Using Sessile Droplet Contact Angle for Heat Transfer Application
- 85 Downloads
This experimental investigation studied the variation in the dynamic contact angle measured on copper surface roughened by emery with grit size of 320, 600, 1000, 1500 and 2000 and titanium oxide nanoparticle-coated nanostructure with thickness of 250, 500, 750 and 1000 nm on copper substrates by e-beam evaporation process using deionized water as liquid with the help of macroscopic contact angle meter. In case of emery-roughened copper, advancing contact angle increases with the increase in emery grit size. For nanoparticle-coated surface, initially with the increase in coating thickness from 250 up to 750 nm, advancing contact angle increases; after that, further increasing in coating thickness to 1000 nm, advancing contact angle diminishes. Generally, the contact angle was found to vary from 30° to 60° for deionized water droplet for the nanoparticle-coated surface having different thickness. The surfaces are characterized with respect to morphology and topography to know the particle size and shape and particle distribution pattern and surface roughness with the help of AFM and FEG-SEM. The theoretical analysis is also carried out to determine the dependency of contact angle and roughness on the nanoparticle-coated titanium oxide thin-film surface. This formulation qualitatively showed a similar trend with experimental results.
KeywordsContact Angle Nanostructure Surface Surface Roughness
List of symbols
Surface free energy
Atomic force microscopy
Scanning electron microscopy
Surface free energy
We are thankful to SAIF, IIT Bombay, CRF, IIT Patna, and CRF, NIT Agartala, for samples characterization such as FESEM, MCA and AFM.
- Bakhshan Y, Hajhosseini A (2015) Using multi-wall carbon nanotube (mwcnt) based nanofluid in the heat pipe to get better thermal performance. Iran J Sci Technol Trans Mech Eng 39(M2):325–335Google Scholar
- Carey VP (1992) Liquid–vapour phase change phenomena, Chapter-3, 1st edn. Hemisphere Publishing Corporation, New York, pp 57–76Google Scholar
- Kline SJ, McClintock FA (1953) Describing uncertainties in single-sample experiments. Mech Eng 75:3–8Google Scholar
- Munshi AM, Singh VN, Kumar M, Singha JP (2008) Effect of nanoparticle size on sessile droplet contact angle. J Appl Phys 084315:103–107Google Scholar
- Zhou CX, Yuan XG, Fan LT, Zeng AW, Yu KT, Kalbassi M, Porter KE (2010) Experimental study on contact angle of ethanol and N-propanol aqueous solutions on metal surfaces, Distillation Absorption, pp 359–364Google Scholar