title: Striped, ellipsoidal particles by controlled assembly of diblock copolymers.
abstract: Control of interfacial interactions leads to a dramatic change in shape and morphology for particles based on poly(styrene-b-2-vinylpyridine) diblock copolymers. Key to these changes is the addition of Au-based surfactant nanoparticles (SNPs) which are adsorbed at the interface between block copolymer-containing emulsion droplets and the surrounding amphiphilic surfactant to afford asymmetric, ellipsoid particles. The mechanism of formation for these novel nanostructures was investigated by systematically varying the volume fraction of SNPs, with the results showing the critical nature that the segregation of SNPs to specific interfaces plays in controlling structure. A theoretical description of the system allows the size distribution and aspect ratio of the asymmetric block copolymer colloidal particles to be correlated with the experimental results.
authors.affiliation: Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA.
authors.forename: Se Gyu
authors.initials: SG
authors.lastname: Jang
authors.forename: Debra J
authors.initials: DJ
authors.lastname: Audus
authors.forename: Daniel
authors.initials: D
authors.lastname: Klinger
authors.forename: Daniel V
authors.initials: DV
authors.lastname: Krogstad
authors.forename: Bumjoon J
authors.initials: BJ
authors.lastname: Kim
authors.forename: Alexandre
authors.initials: A
authors.lastname: Cameron
authors.forename: Sang-Woo
authors.initials: SW
authors.lastname: Kim
authors.forename: Kris T
authors.initials: KT
authors.lastname: Delaney
authors.forename: Su-Mi
authors.initials: SM
authors.lastname: Hur
authors.forename: Kato L
authors.initials: KL
authors.lastname: Killops
authors.forename: Glenn H
authors.initials: GH
authors.lastname: Fredrickson
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Kramer
authors.forename: Craig J
authors.initials: CJ
authors.lastname: Hawker
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D002725:Chloroform; D003102:Colloids; D004655:Emulsions; D006046:Gold / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012542:Scattering, Radiation; D012997:Solvents; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry; D014965:X-Rays
chemical_list: D002593:Cetrimonium Compounds; D003102:Colloids; D004655:Emulsions; D011108:Polymers; D011137:Polystyrenes; D011145:Polyvinyls; D011725:Pyridines; D012997:Solvents; D013501:Surface-Active Agents; C569267:polystyrene-block-poly(2-vinylpyridine); D006046:Gold; D002725:Chloroform; D000077286:Cetrimonium