Nanoparticle Coated Surfaces for Potential Heat Transfer Applications – the Morphology and Wettability
The mechanisms related to nanoparticles’ deposition and assembly on solid surfaces have been investigated with attention of their potential applications in a variety of fields including as heat transfer surfaces. The formed structure can influence and even change the surface properties significantly, thus to enhance the heat transfer performance including improving nucleate sites of boiling. However, the details and protocols of using nanofluids to form the functional coating have not yet been fully investigated, although some extraordinary progress has been achieved. In this paper, we discuss not only the way of nano-suspensions are prepared, but also the effect of nano-suspensions on morphology and wettability of the structured surfaces. We report the structure of nanoparticle collectives that were deposited on solid surfaces. SiO2 nanoparticles of different sizes are dispersed into ethanol to prepare the nano-suspensions with a variety of concentrations. Following ultrasonic dispersion, nanoparticles were deposited from nano-suspensions with a variety of concentrations onto glass substrates. These substrates were subsequently annealed under a series of temperatures, and the surface wettability of the nanoparticle-induced structure investigated using contact angle measurement. The influence of annealing temperature on nanoparticle assembly was revealed by Atomic Force Microscopy (AFM). The characteristics of the structures assembled from the nanoparticles, through the ultrasonic and temperature annealing processes, were thus demonstrated.
SiO2 nanoparticles contact angle surface wettability
N. Gao Y.Y. Yan
Energy and Sustainability Research Division, Faculty of Engineering, University of Nottingham, UK Energy and Sustainability Research Division, Faculty of Engineering, University of Nottingham, UK Ke
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-5
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）