What is it about?
We exploit block-copolymer self-assembly to transfer a nano-pattern comprising of a hexagonal array of dots with diameter ca 50 nm and center-to-center distance ca 70 nm, first to the surface of a Si wafer, and subsequently to a transparent acrylic plastic surface by injection molding. The pattern itself is so small, that it does not diffract visible light. Further, we show that these surfaces can undergo a transition to become super-wetted when exposed to condensation of water vapor, i.e. they form a continuous film of water on their surface instead of the myriad of light scattering microscopic droplets. We demonstrate the transition to the super-wetting and anti-fogging state by treating the surfaces with soft argon plasma, or coating them with nm thin layers of either silica or tungsten metal.
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Why is it important?
This finding is important, because it maps the exact conditions in terms of structure and surface chemistry for the super-wetting state to occur.
Perspectives
Our findings will allow practical engineering of super-wetting surfaces for practical realizations of antifogging and haze-free polymeric windows. Their utilization span further than advanced optical elements such as lenses, mirrors, goggles, and wind shields; improved sunlight harvesting in photovoltaic devices; and better field visibility in endoscopy.
Dr Rafael Taboryski
Danmarks Tekniske Universitet
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This page is a summary of: Mapping the transition to superwetting state for nanotextured surfaces templated from block-copolymer self-assembly, Nanoscale, January 2018, Royal Society of Chemistry,
DOI: 10.1039/c8nr07941b.
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