The ability to guide particles through complex environments has promising applications in biological and physical departments. Catalytic active Janus particles are one of the types of particles...Show moreThe ability to guide particles through complex environments has promising applications in biological and physical departments. Catalytic active Janus particles are one of the types of particles that have the potential of being controlled. This thesis describes a method to track and analyse particles’ motion, which is essential to understand their behaviour. In particular, we focus on particles orbiting around or inside circular obstacles, analysing their speed and the interaction with each other. It is found that the speed of particles orbiting an obstacle is governed by a normal distribution, particles orbiting an obstacle have a lower speed by a factor of 0.85±0.04 than when they move freely, speed is independent of obstacle curvature, and particles orbiting an obstacle together have the same speed, which has a higher value the more particles orbit together. Furthermore, the effects of global and local fuel depletion effects are discussed.Show less