Thermosensitive hollow capsules based on thermoresponsive polyelectrolytes
Thermosensitive hollow capsules based on thermoresponsive polyelectrolytes
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DOI：
10.1002/macp.200350033
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发表时间：
2003-09-22
影响因子：
2.5
通讯作者：
Tauer, K
中科院分区：
文献类型：
--
作者：
Glinel, K;Sukhorukov, GB;Tauer, K
通过逐层沉积到带相反电荷的二嵌段共聚物的胶体颗粒上，每个嵌段共聚物含有聚（N-异丙基丙烯酰胺）（PNIPAM）嵌段，并通过随后的核心分解，成功地制造了热敏中空胶囊。用电泳和单粒子光散射对多层膜的生长进行了表征。通过结合共聚焦显微镜观察和FRAP测量，我们表明，在水溶液中加热后，胶囊的形态和渗透性发生变化。随着温度的升高，随着渗透率的降低，伴随着尺寸的减小，这归因于壳中的结构重排。然而，该过程在冷却时仅部分可逆，限制了胶囊的热响应行为。
Thermosensitive hollow capsules were successfully fabricated by the layer-by-layer deposition onto colloid particles of oppositely charged diblock copolymers each containing a poly (N-isoproprylacrylamide) (PNIPAM) block and by the subsequent decomposition of the core. The multilayer growth was characterized by electrophoresis and single particle light scattering. By combining confocal microscopy observation and FRAP measurements, we showed that the morphology and the permeability of the capsules change upon heating in aqueous solution. The decrease of size accompanied by a decrease of the permeability with increasing temperature was attributed to structural rearrangements in the shell. However, this process is only partially reversible upon cooling, limiting the thermoresponsive behavior of the capsules.