Soft colloidal probes for AFM force measurements between water droplets in oil
KAUST DepartmentClean Combustion Research Center
Physical Sciences and Engineering (PSE) Division
Mechanical Engineering Program
High-Speed Fluids Imaging Laboratory
MetadataShow full item record
AbstractHere we introduce an extension of the atomic force microscopy (AFM) colloidal probe technique, as a simple and reliable experimental approach to measure the interaction forces between small water droplets (~80-160. μm) dispersed in oil. Small water droplets are formed by capillary breakup of a microscale water jet in air, which is forced out of a fine capillary nozzle, and deposited on a superhydrophobic substrate immersed in tetradecane oil medium. In these conditions the water droplets are very loosely attached to the superhydrophobic substrate and are easily picked up with a hydrophobic AFM cantilever to form a soft colloidal probe. Sample force measurements are conducted to demonstrate the capability of the technique.
SponsorsResearch reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Most of the experiments were conducted in KAUST Microfluidics Thrust Area Labs.