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Thursday, 04 June 2020
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Raw materials & technologies, Technologies, Functional coatings

Superhydrophobic coating developed

Friday, 9 April 2010

A facile approach is proposed to fabricate a lotus leaf effect superhydrophobic coating constructed from calcium hydroxide microcapsules with a porous polymer shell.

The lotus leaf effect can be regenerated Source: Naturkundemuseum

The lotus leaf effect can be regenerated Source: Naturkundemuseum

Inspired by the lotus leaf effect, many efforts have been made to fabricate surfaces with binary hydrophobic roughness. Jiguang Liu from Institute of Chemistry, Chinese Acadamy of Sciences (ICCAS) in Bejing and other researchers constructed a supherhydrophobic coating from calcium hydroxide. Calcium hydroxide is cheap and environmentally friendly. It’s extensively used in our daily life. Its solubility is low, ensuring that sufficient core material is preserved after the nanostructured calcium stearate forms. This provides the opportunity to construct a regenerative superhydrophobic coating. Since calcium hydroxide is fragile, the ground particles have irregular contours. Their size distribution is broad, ranging from nanometres to micrometres, leading to a more complete coverage of the capsules onto the substrates. After calcium hydroxide particles are encapsulated within PMMAEC shells, the surface of the resultant microcapsules becomes smooth. In order to confirm the presence of the polymer shell, the microcapsules are immersed in hydrochloric acid aqueous solution to remove calcium hydroxide from the core as it was stated in the Journal of Materials Chemistry, 2010, 20, pages 3211-3215.

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