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This review treats asymmetric colloidal particles moving through their hostfluid under the action of some form of propulsion. The propulsion can come froman external body force or from external shear flow. It may also come fromexternally-induced stresses at the surface, arising from imposed chemical,thermal or electrical gradients. The resulting motion arises jointly from thedriven particle and the displaced fluid. If the objects are asymmetric, everyaspect of their motion and interaction depends on the orientation of theobjects. This orientation in turn changes in response to the driving. Theobjects' shape can thus lead to a range of emergent anisotropic and chiralmotion not possible with isotropic spherical particles. We first consider whataspects of a body's asymmetry can affect its drift through a fluid, especiallychiral motion. We next discuss driving by injecting external force or torqueinto the particles. Then we consider driving without injecting force or torque.This includes driving by shear flow and driving by surface stresses, such aselectrophoresis. We consider how time-dependent driving can induce collectiveorientational order and coherent motion. We show how a given particle shape canbe represented using an assembly of point forces called a Stokeslet object. Wenext consider the interactions between anisotropic propelled particles, thesymmetries governing the interactions, and the possibility of bound pairs ofparticles. Finally we show how the collective hydrodynamics of a suspension canbe qualitatively altered by the particles' shapes. The asymmetric responsesdiscussed here are broadly relevant also for swimming propulsion of activemicron-scale objects such as microorganisms.

A review of shaped colloidal particles in fluids: Anisotropy and chirality