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DAAD1903102276. AUTHOR (S) Doshi, DA; Shah, PB; Singh, S; Branson, ED; Malanoski, AP; Watkins, EB; Majewski, J; van Swol, F; Brinker, CJ. Neutron reflectivity (NR) is used to probe the solid, liquid, vapor interface of a porous superhydrophobic (SH) surface submerged in water.Alow-temperature, low-pressure technique was used to prepare a rough, highly porous organosilica aerogel-like film. UV/ozone treatments were used to control the surface coverage of hydrophobic organic ligands on the silica framework, allowing the contact angle with water to be continuously varied over the range of 160° (superhydrophobic) to <10° (hydrophilic). NR shows that the superhydrophobic nature of the surface prevents infiltration of water into the porous film. Atomic force microscopy and density functional theory simulations are used in combination to interpret the NR results and help establish the location, width, and nature of the SH film-water interface.
PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)University14. SUBJECT Neutron reflectivity (NR) is used to probe the solid, liquid, vapor interface of a porous superhydrophobic (SH) surface submerged in water. A low-temperature, low-pressure technique was used to prepare a rough, highly porous organosilica aerogel-like film. UV/ozone treatments were used to control the surface coverage of hydrophobic organic ligands on the silica framework, allowing the contact angle with water to be continuously varied over the range of 160°(superhydrophobic) to <10°(hydrophilic). NR shows that the superhydrophobic nature of the surface prevents infiltration of water into the porous film. Atomic force microscopy and density functional theory simulations are used in combination to interpret the NR results and help establish the location, width, and nature of the SH film-water interface.
IntroductionWe all can recall seeing water droplets "bead up" on the leaves of plants. Most famous is the Lotus leaf, called the "symbol of purity" because of its self-cleaning properties. At very shallow angles of inclination or with the slightest wind, water droplets roll rather than flow. 1,2 The rolling droplets entrain particle contaminants and parasites, thereby cleaning them from the Lotus leaf surface. It is now recognized that the fascinating fluid behaviors observed for the Lotus plant, like the rolling and bouncing o...