School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London, E1 4NS, United Kingdom.
ACS Appl Mater Interfaces. 2013 Jul 24;5(14):6723-31. doi: 10.1021/am4016389. Epub 2013 Jul 9.
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.
采用层层自组装技术，制备了含有对紫外光响应的重氮基团的新型微胶囊体系，作为货物物质的微容器。在波长约为 380nm 的紫外光直接照射下，重氮树脂（DAR）的重氮基团迅速与相应的聚电解质的磺酸盐或重氮磺酸盐基团反应，将静电相互作用转化为共价键，通过光解在多层中进行有效的原位交联。这种化学转变消除了成对的离子基团，因此生成了更疏水的多层壳，为密封多孔聚电解质胶囊壳提供了一种独特的方法。随后，荧光分子罗丹明 B（RhB）被研究作为小分子封装的典型例子。结果表明，在紫外光触发胶囊壳密封后，染料显著保留在微胶囊内。
