Anderson et al. originally proposed harnessing diffusiophoretic transport in solutions with solute concentration gradients. However, in a simple background gradient, particles can only move in a single direction and rate determined by the local gradient. If, however, the particle itself creates the concentration gradient, the velocity can be tuned independently of any external substrate profile. This self-generated mechanism, called "self-diffusiophoresis," was extensively studied by Golestanian et al. . One common realization is Janus particles, featuring a catalytic coating on one hemisphere, which results in an osmotic pressure imbalance that propels the particle. Experiments by Howse et al. provided early evidence, followed by extensive confirmations , and numerous applications ranging from drug delivery to chemotaxis in bacterial microcompartments .