UV-cross-linkable multilayer microcapsules made of weak polyelectrolytes.
Microcapsules composed of weak polyelectrolytes modified with UV-responsive benzophenone (BP) groups were fabricated by the layer-by-layer (LbL) technique. Being exposed to UV lights, capsules shrunk in the time course of minutes at irradiation intensity of 5 mW/cm(2). The shrinkage adjusted the capsule permeability, providing a novel way to encapsulate fluorescence-labeled dextran molecules without heating. Cross-linking within the capsule shells based on hydrogen abstraction via excited benzophenone units by UV showed a reliable and swift approach to tighten and stabilize the capsule shell without losing the pH-responsive properties of the weak polyelectrolyte multilayers.
School of Engineering and Materials Science, Queen Mary,  University of London.
Qiangying
Q
Yi
Dongsheng
D
Wen
Gleb B
GB
Sukhorukov
D001577:Benzophenones / Q000138:chemical synthesis / Q000737:chemistry*; D002214:Capsules / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004573:Electrolytes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008958:Models, Molecular; D015394:Molecular Structure; D011109:Polymethacrylic Acids / Q000138:chemical synthesis / Q000737:chemistry*; D014466:Ultraviolet Rays
D001577:Benzophenones; D002214:Capsules; D003432:Cross-Linking Reagents; D004573:Electrolytes; D011109:Polymethacrylic Acids; C030613:polymethacrylic acid; C047723:benzophenone