title: Highly selective uptake and release of charged molecules by pH-responsive polydopamine microcapsules.
abstract: A systematic study of the permeation of small molecules through Pdop microcapsules is reported. The zwitterionic Pdop microcapsules are prepared by oxidative polymerization of dopamine on polystyrene microspheres followed by core removal with THF. Rhodamine 6G, methyl orange and alizarin red are chosen as differently charged probing dyes. The loading amount is affected by pH and dye concentration. Highly selective and unidirectional uptake and release of charged molecules through Pdop microcapsules can be achieved by controlling pH value: at low pH, the Pdop particles incorporate cationic dye (rhodamine 6G); at high pH, they incorporate anionic dyes (methyl orange and alizarin red). In each case, the uptake is highly selective.
authors: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
authors: Qinze
authors: Q
authors: Liu
authors: Bo
authors: B
authors: Yu
authors: Weichun
authors: W
authors: Ye
authors: Feng
authors: F
authors: Zhou
mesh_terms: D000838:Anions / Q000737:chemistry*; D000880:Anthraquinones / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry; D002214:Capsules / Q000737:chemistry*; D002412:Cations / Q000737:chemistry*; D004298:Dopamine / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents / Q000737:chemistry; D008422:Materials Testing; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry
chemical_list: D000838:Anions; D000880:Anthraquinones; D001391:Azo Compounds; D002214:Capsules; D002412:Cations; D005456:Fluorescent Dyes; D007202:Indicators and Reagents; D011108:Polymers; D012235:Rhodamines; C026188:rhodamine 6G; C010078:alizarin; C100258:methyl orange; D004298:Dopamine