Claim: Molecular propellers designed by Prof. Petr Kral's group are molecules that have blades serving as efficient pumps of liquids.
Evidence: The molecular propellers designed in the group of Prof. Petr Král from the University of Illinois at Chicago have their blades formed by planar aromatic molecules and the shaft is a carbon nanotube. Molecular dynamics simulations show that these propellers can serve as efficient pumps in the bulk and at the surfaces of liquids.