Deformation controlled assembly of binary microgel thin films.
Deformation controlled assembly of binary microgel thin films.
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DOI：
10.1021/la800092q
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发表时间：
2008-06
期刊：
影响因子：
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通讯作者：
Courtney D. Sorrell;L. Lyon
中科院分区：
文献类型：
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作者：
Courtney D. Sorrell;L. Lyon
我们描述了组装的双组分，水凝胶微粒（微凝胶）单层膜到固体基质上通过被动库仑吸附从溶液中。通过使用两种不同的微凝胶类型具有几乎相同的大小，但不同程度的柔软性，颗粒变形的影响，膜组成进行了测定。使用各种光散射技术的微凝胶性能的测定允许使用随机顺序吸附（RSA）模型作为溶液组合物的函数的膜组合物的预测。然后通过原子力显微镜（AFM）研究薄膜，并从图像中确定表面覆盖率和人口统计数据，并与模型预测进行比较。与预测的颗粒吸附行为的偏差可以直接追溯到吸附后颗粒柔软度、变形和颗粒足迹的差异，这使颗粒覆盖率偏向于更刚性（较小足迹）的颗粒。此外，通过使用可降解和不可降解的核/壳颗粒的混合物，可以通过测量微凝胶侵蚀核后的AFM高度变化来明确地确定颗粒的身份。这些结果表明，无论软颗粒的溶液扩散性能，它们的竞争从一个二元混合物的表面吸附在很大程度上取决于它们与表面的相互作用和它们在表面的变形。
We describe the assembly of two-component, hydrogel microparticle (microgel) monolayer films onto solid substrates via passive Coulombic adsorption from solution. By using two different microgel types with nearly identical sizes but different degrees of softness, the influence of particle deformation on film composition was determined. Determination of the microgel properties using a variety of light scattering techniques allowed for predictions of the film composition as a function of solution composition using a random sequential adsorption (RSA) model. The films were then studied via atomic force microscopy (AFM), and surface coverage and population statistics were determined from the images and compared to the model predictions. Deviations from the predicted particle adsorption behavior can be directly traced to differences in particle softness, deformation, and particle footprint following adsorption, which biases the particle coverage to the more rigid (smaller footprint) particles. Furthermore, by using a mixture of degradable and nondegradable core/shell particles, the identity of the particles can be unambiguously determined by measuring AFM height changes following erosion of the core from the microgels. These results show that, regardless of the solution diffusion properties of soft particles, their competition for surface adsorption from a binary mixture is largely dictated by their interactions with the surface and their deformation at the surface.