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Self-propelled chemically powered synthetic micron and nano-scale motors arebeing intensively studied because of the wide range of potential applicationsthat exploit their directed motion. This paper considers even smaller{\AA}ngstr\"om-size synthetic motors. Such very small motors in bulk solutiondisplay effects arising from their self-propulsion. Recent experiments haveshown that small-molecule catalysts and single enzyme molecules exhibitproperties that have been attributed to their chemical activity. Moleculardynamics is used to investigate the properties of very small{\AA}ngstr\"om-size synthetic chemically powered sphere-dimer motors in asimple atomic-like solvent confined between walls separated by distances oftens of nanometers. Evidence for strong structural ordering of the motorsbetween the walls, which reflects the finite size of solvent molecules anddepends on solvent depletion forces, is provided. Dynamical properties, such asaverage motor velocity, orientational relaxation, and mean square displacement,are anisotropic and depend on the distance from the walls. This researchprovides information needed for potential applications that use molecular-scalemotors in the complex confined geometries encountered in biology and thelaboratory.

Nanoconfined catalytic {\AA}ngstr\"om-size motors