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"hydrophobic coatings"
"nakajima hashimoto thin solid films"
"preparation of hard super hydrophobic visible light"
"takai lake louise composites snow"
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"Composites: Design for performance"
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"Recent Studies on Super-Hydrophobic Films"
Part I: Developing Hydrophobic Thin Film Coatings
Zhang, X., Jarn, M., Peltonen, J., Pore, V., Vuorinen, T., Levanen, E., Mantyla, T., Analysis of roughness parameters to specify superhydrophobic antireflective boehmite films made by the sol-gel process, Journal of the European Ceramic Society 28, 2177-2181, (2008).
Tag: Snow and PV, super-hyrdophobic, antireflective
In this paper, superhydrophobic antireflective boehmite (AlOOH) films were made with different optical transmittances by varying the heat-treatment temperatures and the film thicknesses. A set of roughness parameters was determined to characterize the superhydrophobic property and the antireflective property. The aim is not only to identify the superhydrophobic property but also to specify the antireflective property by the roughness parameters. The superhydrophobic antireflective boehmite films were made from aluminum tri-sec-butoxide, isopropyl alcohol, ethyl acetoacetate and (heptadecafluoro-1,1,2,2-tetrahydrodecyl) trimethoxy-silane. Two different sols were produced and spun coated on glass slides. By varying the heat-treatment temperatures and the film thicknesses the superhydrophobic and antireflective properties were tuned. Three slides with sol-A were produced and heat treated at 100C, 300C and 500C. Contact angles were 103, 152, 152 degrees respectively will optical transmittance of all three greater than that of reference glass (92-96%). Two slides with sol-B coatings were treated at 300C. They both produced contact angles of 154 degrees and excellent optical transmittance. B1-300 yielded 95-96% transmittance over the whole wavelength range.
Scmidt, D., Coburn, C., Dekoven, B., Potter, G., Meyers, G. & Fischer, D., Water-based non-stick hydrophobic coatings,Nature 368, 39 - 41, (03 March 1994).
Tag: reactive perfluoroalkyl polymeric surfactants
This article investigates the suitability of RPPS as non-stick coatings when cross linked and cured with reactive ionic functionalities such as carboxylate and phenate. They found an effective an effective crosslinking approach was to react ammonium-carboxylate functional RPPS with a poly-IPO based crosslinking agent. Solutions with both compounds were stable until applied to the surface and loss of ammonia and solvent, then amide-ester crosslinks were formed. Various RPPS' were prepared by copolymerizing acrylate or methylacrylate esters of fluoroalkyl alcohols with carboxylic acid functional vinyl monomers. Crosslinking of final film was varied by controlling the initial mole ratios of carboxylate to oxazoline in poly-IPO when reacted with RPPS. The wettability of these films was compared using tilt angle measurements (more sensitive than theta c)....
Ma, Y., Cao, X., Feng, X., Ma, Y., Zou, H., Fabrication of super-hydrophobic film from PMMA with intrinsic water contact angle below 90 degrees
Tag: hydrophobic surfaces without low surface energy materials, polymer modification, selective solvent treatment
A super-hydrophobic film was created without the surface modification of low surface energy materials such as fluorides by synthesizing a polystyrene (PS)-PMMA film and treating with warm cyclohexane. The mixture of PMMA and PS was dissolved in THF to 5 wt%, then films were spin-cast to glass slides. Finally, the coatings were exposed to warm cyclohexane. The spin-cast films were transparent, turned translucent following cyclohexane exposure, indicating the possible formation of micro-structures in the film by removal of PS. CAs with water as high as 154 degrees were reported.