School of Engineering and Materials Science, Queen Mary, University of London, London, UK.
Soft Matter. 2014 Mar 7;10(9):1384-91. doi: 10.1039/c3sm51648b.
UV responsive microcapsules containing azobenzene were fabricated by sequential deposition of oppositely charged poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) and poly(diallyldimethyl ammonium) chloride (PDADMAC). As found in this work, combination of PDADMAC and PAZO led to aggregation of PAZO segments in the progress of polymer deposition, which facilitated the large extent of J aggregates when the capsules were exposed to UV light. J aggregate assemblies destroyed the integrity of capsule shell formations, demonstrating capsule swelling and further breakage. This UV induced capsule breakage offered a new way to modulate the release of encapsulated cargos.
通过交替沉积带相反电荷的聚[1-[4-(3-羧基-4-羟基苯偶氮)苯磺酰胺基]-1,2-乙二基, 钠盐]（PAZO）和聚二烯丙基二甲基氯化铵（PDADMAC），制备了含有偶氮苯的对紫外光响应的微胶囊。正如本工作中所发现的，PDADMAC 和 PAZO 的组合导致 PAZO 链段在聚合物沉积过程中聚集，这有利于微胶囊暴露于紫外光时 J 聚集体的大量形成。J 聚集体的组装破坏了胶囊壳形成的完整性，导致胶囊溶胀和进一步破裂。这种紫外光诱导的胶囊破裂为调节包封货物的释放提供了一种新方法。
