Abstract
Novel microcapsule systems containing UV-responsive diazonium groups were fabricated as microcontainers for cargo substance encapsulation by using a layer-by-layer (LbL) assembly technique. Upon direct exposure to UV light with a wavelength of approximately 380 nm, the diazonium groups of diazoresion (DAR) rapidly reacted with sulfonate or diazo-sulfonate groups of counterpart polyelectrolytes, which converted electrostatic interactions to covalent bonds, demonstrating an effective in situ cross-linking within multilayers via photolysis. Such chemical transition eliminated the paired ionic groups, therefore generating more hydrophobic multilayer shells, offering a unique approach to seal the porous polyelectrolyte capsule shells. Fluorescent molecule rhodamine B (RhB) was consequently studied as a typical example for small molecule encapsulation. Results indicated that the dye was remarkably retained within the microcapsules after UV-triggered capsule shell sealing.
Original language | English |
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Pages (from-to) | 6723-6731 |
Number of pages | 9 |
Journal | ACS Applied Materials and Interfaces |
Volume | 5 |
Issue number | 14 |
DOIs | |
Publication status | Published - 24 Jul 2013 |
Externally published | Yes |
Keywords
- capsule
- diazonium
- encapsulation
- layer-by-layer
- photolysis
ASJC Scopus subject areas
- Materials Science(all)