PCL 45 :PCL 45 -b-PDMA 348 platelets synthesized in bulk were spin-coated onto the cleaned coverslip at 3200 rpm for 15 seconds until the desired surface density was achieved. Then a plastic spacer was placed onto the platelet-coated surface before the addition of methanol: water (30:70, v: v) solution and imaging. A laser power density of 2 µW µm -2 at 637 nm and a camera exposure time of 900 µs were selected unless otherwise stated. A minimum number of 100 platelets were analyzed to determine the average size.