Abstract
The interactions between liquid–solid and liquid–gas phases can be characterized by measuring the contact angle between a solid surface and a liquid droplet. The wetting properties of magnetic fluids can be determined by contact angle measurements. In the case of these fluids the wetting properties are also affected by an external magnetic field. In our research we investigated the magnetic field induced deformation of water based magnetic fluid (Ferrotec EMG 700) droplets containing various amount of nanosized (~10 nm) magnetite particles on different surfaces. The contact angle measurements were conducted in a closed controlled environment on droplets placed on hydrophobic (silicone rubber coated silicon wafer) and hydrophilic (uncoated silicon wafer) surfaces. The droplets were photographed using a microscope camera and the contact angles were determined by image processing. The experimental data are discussed in the framework of a perturbative density functional theory.
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