TY - GEN
T1 - Nanofluids evaporation kinetics on microstructured superhydrophobic surfaces
AU - Xu, Wei
AU - Choi, Chang Hwan
PY - 2010
Y1 - 2010
N2 - In this paper, we experimentally studied the evaporation kinetics of sessile droplets of nanofluids with systematically varying particle sizes on superhydrophobic surfaces of welldefined micro-post structures. The superhydrophobic surface patterns were fabricated on a silicon wafer by photolithography and deep reactive ion etching (DRIE) at cryogenic temperature followed by Teflon coating. The 0.01 wt% suspensions of gold (Au) nanoparticles with varying sizes (5, 50, and 250 nm in diameter) were tested as nanofluids for the evaporation kinetics including the contact angle, base diameter, height, volume and evaporation rate by using a goniometer. The dryout patterns were investigated by using scanning electron microscopy (SEM). The results show that the surface topography and nanoparticle sizes have significant effects on the initial contact angle, profile evolution, wetting transition, evaporation rate, and dryout deposition pattern of the nanofluid droplets.
AB - In this paper, we experimentally studied the evaporation kinetics of sessile droplets of nanofluids with systematically varying particle sizes on superhydrophobic surfaces of welldefined micro-post structures. The superhydrophobic surface patterns were fabricated on a silicon wafer by photolithography and deep reactive ion etching (DRIE) at cryogenic temperature followed by Teflon coating. The 0.01 wt% suspensions of gold (Au) nanoparticles with varying sizes (5, 50, and 250 nm in diameter) were tested as nanofluids for the evaporation kinetics including the contact angle, base diameter, height, volume and evaporation rate by using a goniometer. The dryout patterns were investigated by using scanning electron microscopy (SEM). The results show that the surface topography and nanoparticle sizes have significant effects on the initial contact angle, profile evolution, wetting transition, evaporation rate, and dryout deposition pattern of the nanofluid droplets.
KW - Evaporation
KW - Nanofluids
KW - Superhydrophobic surface
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U2 - 10.1115/IMECE2009-13067
DO - 10.1115/IMECE2009-13067
M3 - Conference contribution
AN - SCOPUS:77954297290
SN - 9780791843857
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings
SP - 1015
EP - 1024
BT - Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009
T2 - ASME 2009 International Mechanical Engineering Congress and Exposition, IMECE2009
Y2 - 13 November 2009 through 19 November 2009
ER -