title: Thermomolecular orientation of nonpolar fluids.
abstract: We investigate the response of molecular fluids to temperature gradients. Using nonequilibrium molecular dynamics computer simulations we show that nonpolar diatomic fluids adopt a preferred orientation as a response to a temperature gradient. We find that the magnitude of this thermomolecular orientation effect is proportional to the strength of the temperature gradient and the degree of molecular anisotropy, as defined by the different size or mass of the molecular atomic sites. We show that the preferred orientation of the molecules follows the same trends observed in the Soret effect of binary mixtures. We argue this is a general effect that should be observed in a wide range of length scales.
authors.affiliation: Department of Chemistry, Imperial College London, SW7 2AZ, London United Kingdom.
authors.forename: Frank
authors.initials: F
authors.lastname: Römer
authors.forename: Fernando
authors.initials: F
authors.lastname: Bresme
authors.forename: Jordan
authors.initials: J
authors.lastname: Muscatello
authors.forename: Dick
authors.initials: D
authors.lastname: Bedeaux
authors.forename: J Miguel
authors.initials: JM
authors.lastname: Rubí