期刊
LANGMUIR
卷 30, 期 28, 页码 8268-8275出版社
AMER CHEMICAL SOC
DOI: 10.1021/la404854z
关键词
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资金
- World Class University (WCU) Program through the National Research Foundation (NRF) [R31-2008-000-10083-0]
- Nano-Material Technology Development Program through the National Research Foundation (NRF) - Korean Ministry of Education, Science and Technology [R2011-003-2009]
The wetting and evaporative aggregation of alumina nanofluids (Al2O3) are examined for CVD-synthesized graphene-coated (GC) surfaces that are known as strongly hydrophobic (theta(contact) approximate to 90 degrees). Our findings are compared to those associated with a hydrophilic cover glass (CG) substrate (theta(contact) approximate to 45 degrees). The nanofluidic self-assemblies on the GC substrate are elaborately characterized in terms of the droplet wetting/crack formation, the particle migration time over the evaporative time (C-R), the Derjaguin-Landau-Verwey-Overbeek forces (F-DLVO), and the relative thermal conductivity (K-R). The GC substrate forms relatively thicker and larger cracks and requires a longer evaporation time. Both the GC and CG substrates share approximately the same time constant C-R, which suggests the formation of coffee-ring patterns for both substrates. The GC shows negative F-DLVO, which implies a repulsive force between the nanoparticles and the substrate, and the CG shows a positive F-DLVO of attraction. Furthermore, a more than 3 order of magnitude larger thermal conductivity of GC compared to that of CG drives significantly different particle/fluid motions near the drop edge areas between the two substrates.
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