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Ultrahydrophobic (or superhydrophobic) surfaces are highly hydrophobic, i.e., extremely difficult to wet. The contact angles of a water droplet on an ultrahydrophobic material exceed 150°. This is also referred to as the lotus effect, after the superhydrophobic leaves of the lotus plant. A droplet striking these kinds of surfaces can fully rebound like an elastic ball. Interactions of bouncing drops can be further reduced using special superhydrophobic surfaces that promote symmetry breaking, pancake bouncing or waterbowl bouncing.

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rdfs:label
  • Ultrahidrofobicitat (ca)
  • Ultrahidrofobicidad (es)
  • Surface superhydrophobe (fr)
  • 超撥水 (ja)
  • Ultrahydrophobicity (en)
rdfs:comment
  • Les superfícies superhidrofòbiques són altament hidròfobes, és a dir, extremadament difícils d'humitejar. L'angle de contacte d'una gota d'aigua és superior a 150° i l'angle d'histèresi de l'angle de lliscament/contacte és menor que 10°. Això també es coneix com l'efecte lotus, a causa que es presenta en les fulles de la superhidrofòbica planta del lotus. (ca)
  • Las superficies superhidrofóbicas son altamente hidrófobas, i.e., extremadamente difíciles de humedecer. El ángulo de contacto de una gota de agua es superior a 150° y el ángulo de histéresis del ángulo de deslizamiento/contacto es menor que 10°.​ Esto también se conoce como el efecto loto, debido a que se presenta en las hojas de la superhidrofóbica planta de loto. (es)
  • Une surface superhydrophobe est une surface extrêmement difficile à mouiller (avec l'eau, et a priori avec n'importe quel liquide). À la différence de l'hydrophobie, qui est une propriété chimique ou physico-chimique, la superhydrophobie est une propriété physique. Elle est décrite par la loi de Cassie, selon laquelle un angle de contact supérieur à 150° ne permet pas à l'eau d'accrocher (si 90° < θ < 150°, on parle d'effet hydrophobe). (fr)
  • 超撥水(ちょうはっすい)とは、濡れ現象において高度な撥水性によって面に対して150°を超える接触角で水滴が接する現象のこと。なお、本項目では便宜上、面に対して0°に近い接触角で濡れが生ずる現象である超親水についても取り上げる。 常識的な物質において、最大の撥水性を示す官能基は(-CF3)である。CF3末端を並べた表面の表面張力は約 6mNm-1である。フッ素樹脂などで平面状にきれいに並んだトリフルオロメチル基と水が接する場合、その接触角は 120°前後である。この撥水性をさらに強化し、接触角を150°を超える状態にまで強化した状態が超撥水性である。この場合、水滴は球状になって表面を転がることになる。 (ja)
  • Ultrahydrophobic (or superhydrophobic) surfaces are highly hydrophobic, i.e., extremely difficult to wet. The contact angles of a water droplet on an ultrahydrophobic material exceed 150°. This is also referred to as the lotus effect, after the superhydrophobic leaves of the lotus plant. A droplet striking these kinds of surfaces can fully rebound like an elastic ball. Interactions of bouncing drops can be further reduced using special superhydrophobic surfaces that promote symmetry breaking, pancake bouncing or waterbowl bouncing. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Contact_angle.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Contact_angle_microstates.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/DropConnectionAngel.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Pillars_showing_unit_cell_perimter_per_area.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Super-hydrophobic_paint_test.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Unitary_roughness_structure_versus_hierarchical_structure.jpg
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