FM-AFM with hanging fiber probe for the study of liquid / liquid interfaces

Abstract

This article describes how a frequency modulation AFM using a hanging fiber force probe made from a quartz tuning fork provides local measurements on liquid-liquid interfaces. After detailing the manufacture and calibration of the force probe, we provide evidence that this AFM is suitable for quantitative measurements at the interface between two liquids. The repeatability of the measurements allows a poly-dimethylsiloxane / water moving interface to be monitored over several hours : the evaporation of a water droplet immersed in poly-dimethylsiloxane is observed, and its interfacial tension evolution over time is measured. Deformation of the interface is also observed. These capabilities, and preliminary results on the interface between two immiscible liquids, pave the way for interface manipulation and study of complex fluid-fluid interfaces.

Final version accepted for publication in Langmuir

References in corpus (4)

• Soft swimming: Exploiting deformable interfaces for low-Reynolds number locomotion
• Dynamics of quartz tuning fork force sensors used in scanning probe microscopy
• Shape and effective spring constant of liquid interfaces probed at the nanometer scale: finite size effects
• High Resolution Viscosity Measurement by Thermal Noise Detection