Optical Manipulation of Liquids by Thermal Marangoni Flow along the Air-Water Interfaces of a Superhydrophobic Surface.

ABSTRACT: The control of liquid motion on the micrometer scale is important for many liquid transport and biomedical applications. An efficient way to trigger liquid motion is by introducing surface tension gradients on free liquid interfaces leading to the Marangoni effect. However, a pronounced Marangoni-driven flow generally only occurs at a liquid-air or liquid-liquid interface but not at solid-liquid interfaces. Using superhydrophobic surfaces, the liquid phase stays in the Cassie state (where liquid is only in contact with the tips of the rough surface structure and air is enclosed in the indentations of the roughness) and hence provides the necessary liquid-air interface to trigger evident Marangoni flows. We use light to asymmetrically heat this interface and thereby control liquid motion ne

SUBMITTER: Gao A 

PROVIDER: S-EPMC8397335 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature