ISSN Online: 2377-424X
ISBN Print: 978-1-56700-421-2
International Heat Transfer Conference 15
Evaporation of a Water Droplet Deposited on a Nano-Patterned Transparent Film Fabricated by UV Nanoimprint
Resumo
A moth-eye structure, which consisted of nano-scale conical patterns, has been of increasing interest because
the light reflected by such a structure is considerably minimized. The authors have developed a fabrication
method of a moth-eye structure onto grassy carbon (GC) substrate using an oxygen-ion-beam system and
succeeded in the duplication of the moth-eye structure on an ultra-violet (UV) curable resin via UV nanoimprint.
Although the GC substrate was an opaque material, this duplicated pattern was transparent. In this study, we
investigated the evaporation characteristic of a water droplet on a nano-patterned substrate. As a result, it became clear that the water droplet penetrates into the nano-patterned substrate along the contact line and the speed of evaporation is accelerated, compared to the case of substrates without nano-pattern. This phenomenon not only
occurred on the GC substrate but also occurred on the duplicated transparent substrate. The authors believe that
the nano-patterned transparent film is a suitable candidate for designing the surface of a multifunctional film for
the protection of solar cells or outdoor display screens, because it can accelerates the evaporation of raindrops
and allow the light to readily pass through.