Bachelor or Master assignments

Particles on different adhesive surfaces

Particles on different adhesive surfaces

To understand the interparticle adhesion mechanism and the adhesion between particles and surfaces, we propose to measure the adhesion force using the AFM colloidal probe technique. We believe that the capillary force is the dominating force for our 10 μm sized silica and polystyrene particles.


We propose the following measurements:

  • Adhesion force as a function of relative humidity on different surfaces: rough surfaces, samples of different materials, hydrophilic and hydrophobic coated samples, and samples that have been grounded
  • Adhesion force measurements between particles and different polymer surfaces
  • Scanning of the interparticle adhesion force on micro fabricated supply trays of particles (figure depicts one of the supply trays with circular pockets)
  • Different particle diameters and materials (10 μm, 5 μm and 3 μm silica and PS particles)
  • Does the history of the particles effect the adhesion mechanisms, e.g. after shaking or rubbing the particles (tribo-electricity)?

Keywords: Colloidal particles, adhesion, AFM, relative humidity, surface roughness, polymers, tribo-electricity


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