Droplet motion on a wrinkled PDMS surface with a gradient structural length scale shorter than the droplet diameter.

ABSTRACT: Droplet transportation using a wettability gradient surface has attracted much attention owing to applications such as in microfluidic devices. A surface with a spatial structural gradient was prepared through a simple and cost-effective process even though understanding of droplet behavior on the structure was still limited. Here, we report impinging droplet motion on a gradient wrinkled surface. Surfaces were prepared through hard film deposition on soft pre-strained polydimethylsiloxane (PDMS) with a mask installed with a slit to control the amount of deposition, which is related to the wavelength of the wrinkles. Droplets were impinged with varying position with respect to the structure, and the droplet motion was observed in the direction away from the region under the slit. We found

SUBMITTER: Yamada Y 

PROVIDER: S-EPMC9087903 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature