title: Photocontrolled self-assembly and disassembly of block ionomer complex vesicles: a facile approach toward supramolecular polymer nanocontainers.
abstract: A new concept of designing a photocontrollable supramolecular polymer nanocontainer through the electrostatic association between an azobenzene-containing surfactant (AzoC10) and a double-hydrophilic block ionomer, poly(ethylene glycol)-b-poly(acrylic acid) (PEG(43)-PAA(153)), is described. Such a block ionomer complex can self-assemble in aqueous solution and form vesicle-like aggregates, which are composed of a poly(ethylene glycol) corona and a poly(acrylic acid) shell associated with azobenzene-containing surfactant. The photoisomerization of azobenzene moieties in the block ionomer complex can reversibly tune the amphiphilicity of the surfactants, inducing the disassembly of the vesicles. Such block ionomer complex vesicles are further evaluated as nanocontainers capable to encapsulate and release guest solutes on demand controlled by light irradiation. For example, the vesicles encapsulating the fluorescein sodium display clear spherical images observed by fluorescence microscopy. However, such fluorescence-marked images disappear after releasing the solute from the vesicles triggered by the UV light. Such novel materials are of both basic and practical significance, especially as prospective nanocontainers for cargo delivery.
authors.affiliation: Key Lab of Organic Optoelectronics & Molecular Engineering Department of Chemistry, Tsinghua University, Beijing 100084, PR China.
authors.forename: Yapei
authors.initials: Y
authors.lastname: Wang
authors.forename: Peng
authors.initials: P
authors.lastname: Han
authors.forename: Huaping
authors.initials: H
authors.lastname: Xu
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Wang
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Kabanov
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry; D019793:Fluorescein / Q000737:chemistry; D007700:Kinetics; D008027:Light; D046529:Microscopy, Electron, Transmission; D008856:Microscopy, Fluorescence; D008962:Models, Theoretical; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010777:Photochemistry / Q000379:methods*; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D000180:Acrylic Resins; D001391:Azo Compounds; D011108:Polymers; D013501:Surface-Active Agents; D011092:Polyethylene Glycols; C006903:carbopol 940; C009850:azobenzene; D019793:Fluorescein