Electrodewetting of Surfactant-Laden Drops on Silicon Oxide: Molecular Insights from Sum-Frequency Generation Spectroscopy
Abstract
O molecules, along with silanol groups. Upon EDeW, no significant changes in SFG spectra were observed far from the contact line, but locally, the exposed surface exhibits a thicker and more disordered DTAB-rich layer, consistent with a hemimicellar structure. Our data suggest that EDeW involves electrophoretic transport of DTAB along the liquid-vapor interface toward the contact line, where surfactant deposition modifies the solid-vapor interface to become more hydrophobic. This mechanism explains the observed contact angle increase and highlights the critical role of interfacial surfactant organization in the EDeW.
Fields of Study & Subjects
Electrowetting and Microfluidic Technologies
Force Microscopy Techniques and Applications
Fluid Dynamics and Thin Films
Publication details
- Journal / source
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Volume
- 42
- Issue
- 20
- Pages
- 14510–14519
- Publication date
- 11 May 2026
- Language
- EN