Influence of PEG on the clustering of active Janus colloids

Micrometer scale “colloidal” particles that propel in a deterministic fashion response to local environmental cues are useful analogs self-propelling entities found nature. Both natural and synthetic active colloidal systems often near boundaries or located crowded environments. Herein, we describe experiments which measured the influence of hydrogen peroxide concentration dispersed polyethylene glycol (PEG) on clustering behavior 5 µm catalytic Janus at low concentration. We extent occurred ensembles grew with absence PEG. Once PEG was added, slightly enhanced volume fractions, but reduced higher volumes fractions. The region mitigated fractions corresponded propulsion previously be quenched. Complementary agent based simulations showed nominal speed. These data support hypothesis growth living crystals is increases speed, addition will tend mitigate cluster formation as consequence quenched these conditions.