Contact angles of rotating sessile droplets

• General framework allowing the analysis of wetting of rotating substrates is proposed.
• Wetting of ideal, rough and chemically heterogeneous surfaces by sessile rotating droplets is treated.
• The effect of the line tension is considered.
• The problem of wetting is discussed in the framework of a variational approach.
• Young, Wenzel and Cassie equilibrium contact angles are independent of the rotation of a substrate.

The paper proposes a general framework allowing the analysis of wetting problems in the situation where a sessile drop is placed on a rotating substrate. Wetting of ideal, rough and chemically heterogeneous surfaces by sessile rotating droplets is treated. The effect of the line tension is considered. The problem of wetting is discussed in the framework of a variational approach. It is demonstrated that the Young, Wenzel and Cassie equilibrium contact angles are independent of the rotation of a substrate as well as external fields.

Cassie–Baxter wetting of rotating flat chemically heterogeneous surface.Figure optionsDownload as PowerPoint slide