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Using a simple theoretical model of a nanoscale asymmetric particle/moleculewith asymmetric structure or/and asymmetric charge distribution, here using acharge dipole as an example, we show that there is unidirectionaltransportation mediated by non-white fluctuations if the asymmetric orientationof the particle/molecule is constrained. This indicates the existence of aninherent equivalent force, which drives the particle/molecule itself along theorientation of the asymmetric particle in the environment of fluctuations. Inpractical systems, equivalent force also exist in the asymmetric molecules,such as water and ethanol, at the ambient condition since thermal fluctuationsare not white anymore at nanoscale [Wan, R., J. Hu, and H. Fang, Sci. ChinaPhys. Mech. Astron. 2012, 55, 751]. Molecular dynamic simulations show thatthere is unidirectional transportation of an ultrathin water layer on solidsurface at room temperature when the orientations of water molecules have apreference. The finding will play an essential role in the understanding of theworld from a molecular view and the developing of novel technology for variousnanoscale and bulk applications, such as chemical separation, water treatment,sensing and drug delivery.

Inherent fluctuation-mediated equivalent force drives directional  motions of nanoscale asymmetric particles -- Surf-riding of asymmetric  molecules in thermal fluctuations