Eclipse ti2

The microswimmers experiments were performed in a simple cell consisting of a Teflon ring of 15 mm innner diameter and 4 mm height glued on a microscope slide with NOA 63 UV glue from Norlands optics. Stock H₂O₂ (30 v/v%, Acros Organics) was added to dilute particle suspensions of the Pt-silica Janus raspberry particles to obtain 300 μL of a fuel rich (3 v/v% H₂O₂) solution, which was then pipetted into the Teflon ring before closing the cell by placing a glass coverslip on top. 2044 × 2048 pixels images were recorded in an inverted microscope (Nikon Eclipse Ti2) using a 60x objective and a Hamamatsu Orca Flash 4.0 v3 camera at 67 fps.

Diluted particle suspensions were imaged inside a glass channel with an inner cross-section of 100 μm × 1 mm and a length of 5 cm. In order to provide a mechanical support during imaging, the channel was glued to a microscope slide with the two ends protruding from the slide. The inlet of the channel was inserted in a tube (Tygon 2001 tubing ID 0.64 mm) and glued with (2 × 15 mL, 5 min rapid glue) from Araldite. The suspension was injected with a 1 mL syringe (Injekt from B. Braun Melsungen AG) using a syringe pump (NE-1000 from New Era Pump Systems Inc.). Images of the setup can be found in Fig. SI2-A, ESI.† 1336 × 726 pixels images were recorded in an inverted microscope (Nikon Eclipse Ti2) using a 100x oil objective and a Hamamatsu Orca Flash 4.0 v3 camera at 67 fps.