title: Site-specific growth of polymers on silica rods.
abstract: Colloids specifically developed for self-assembly (SA) into advanced functional materials have rapidly become more complex, as this complexity allows for more ways to optimize both the SA process and the properties of the resulting materials. For instance, by creating 'patchy' particles more open structures can be achieved through directional interactions. However, the number of ways in which site-specific chemistry can be achieved on particle surfaces is still limited. Here, we show how polymer patches can be specifically grown onto only the flat end of bullet-shaped silica rods by utilizing a subtle anisotropy in surface tension and shape caused by the growth mechanism of the rods. Conversely, if the bullet-shaped silica rods are used as 'Pickering-emulsion' stabilizers the same surface tension effects exclusively direct the orientation of the rods into a 'hedgehog-morphology'. Finally, we demonstrate how an external electric field can direct the particles in a 'vectorial' way.
authors.affiliation: Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. pengbo006@gmail.com A.vanBlaaderen@uu.nl A.Imhof@uu.nl.
authors.forename: Bo
authors.initials: B
authors.lastname: Peng
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Soligno
authors.forename: Marlous
authors.initials: M
authors.lastname: Kamp
authors.forename: Bart
authors.initials: B
authors.lastname: de Nijs
authors.forename: Joost
authors.initials: J
authors.lastname: de Graaf
authors.forename: Marjolein
authors.initials: M
authors.lastname: Dijkstra
authors.forename: René
authors.initials: R
authors.lastname: van Roij
authors.forename: Alfons
authors.initials: A
authors.lastname: van Blaaderen
authors.forename: Arnout
authors.initials: A
authors.lastname: Imhof