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Single‐Component Diazo‐resin Microcapsules for Encapsulation and Triggered Release of Small Molecules
Author(s) -
Yi Qiangying,
Sukhorukov Gleb B.
Publication year - 2013
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201300246
Subject(s) - diazo , covalent bond , molecule , polymer , rhodamine , rhodamine b , sulfonate , polyelectrolyte , chemistry , materials science , photodissociation , chemical engineering , polymer chemistry , nanotechnology , photochemistry , composite material , organic chemistry , optics , photocatalysis , sodium , catalysis , fluorescence , physics , engineering
Although many efforts have been devoted to encapsulate potential cargo substances with large molecular weights, at present it is still a challenging task to seal small molecules in multilayer capsule cavities. In this work, single‐component polyelectrolyte microcapsules based on diazo‐resin are proposed to solve this problem. Generally, the multilayer capsule system is built up with DAR polymers carrying both positive and negative charges. Upon exposure to a 380 nm UV light, photolysis between paired diazonium and diazo‐sulfonate groups rapidly converts the electrostatic interactions into covalent cross‐linking within the multilayer shells. This photo‐driven reaction offers an externally controlled method to seal the multilayer capsules. The resulting phenyl‐ring‐rich shell structures serve as excellent sealed micro‐containers to entrap small molecule rhodamine B.