Lebedeva Olga V, Kim Byoung-Suhk, Vinogradova Olga I
Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany.
Langmuir. 2004 Nov 23;20(24):10685-90. doi: 10.1021/la048665s.
By using a combination of atomic force and confocal microscopy, we explore the deformation properties of multilayer microcapsules filled with a solution of strong polyelectrolyte. Encapsulation of polyelectrolyte was performed by regulation of the multilayer shell permeability in water-acetone solutions. The "filled"capsules prepared by this method were found to be stiffer than "hollow" ones, which reflects the contribution of the excess osmotic pressure to the capsule stiffness. The force-deformation curves contain three distinct regimes of reversible, partially reversible, and irreversible deformations depending on the degree of compression. The analysis of the shape of compressed capsules and of the inner polyelectrolyte spacial distribution allowed one to relate the deformation regimes to the permeability of the multilayer shells for water and inner polyelectrolyte at different stage of compression.
通过结合使用原子力显微镜和共聚焦显微镜，我们探究了填充有强聚电解质溶液的多层微胶囊的变形特性。聚电解质的包封是通过调节多层壳在水 - 丙酮溶液中的渗透性来实现的。通过这种方法制备的“填充”胶囊比“空心”胶囊更硬，这反映了过量渗透压对胶囊硬度的贡献。根据压缩程度，力 - 变形曲线包含可逆、部分可逆和不可逆变形的三个不同阶段。对压缩胶囊的形状和内部聚电解质空间分布的分析使人们能够将变形阶段与多层壳在不同压缩阶段对水和内部聚电解质的渗透性联系起来。
