Multiple particle tracking study of thermally-gelling nanoemulsions,Soft Matter

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Multiple particle tracking study of thermally-gelling nanoemulsions
Soft Matter ( IF 2.9 ) Pub Date : 2017-09-15 00:00:00 , DOI: 10.1039/c7sm01191a
Li-Chiun Cheng _{1,

2,

3,

4} , Lilian C. Hsiao _{4,

5,

6,

7} , Patrick S. Doyle _{1,

2,

3,

4}

Affiliation

We perform multiple particle tracking (MPT) on a thermally-gelling oil-in-water nanoemulsion system. Carboxylated and plain polystyrene probes are used to investigate the role of colloidal probe size and surface chemistry on MPT in the nanoemulsion system. As temperature increases, hydrophobic groups of PEG-based gelators (PEGDA) partition into the oil/water interface and bridge droplets. This intercolloidal attraction generates a wide variety of microstructures consisting of droplet-rich and droplet-poor phases. By tailoring the MPT colloidal probe surface chemistry, we can control the residence of probes in each domain, thus allowing us to independently probe each phase. Our results show stark differences in probe dynamics in each domain. For certain conditions, the mean squared displacement (MSD) can differ by over four orders of magnitude for the same probe size but different surface chemistry. Carboxylated probe surface chemistries result in “slippery” probes while plain polystyrene probes appear to tether to the nanoemulsion gel network. We also observe probe hopping between pores in the gel for carboxylated probes. Our approach demonstrates that probes with different surface chemistries are useful in probing the local regions of a colloidal gel and allows the measurement of local properties within structurally heterogeneous hydrogels.

中文翻译：

热凝胶纳米乳液的多粒子跟踪研究

我们在热凝胶水包油纳米乳液系统上执行多粒子跟踪（MPT）。羧基化和普通聚苯乙烯探针用于研究纳米乳液体系中胶体探针尺寸和表面化学性质对MPT的作用。随着温度升高，基于PEG的胶凝剂（PEGDA）的疏水基团分配到油/水界面和桥滴中。这种胶体间吸引力产生了由富液滴相和贫液滴相组成的各种微观结构。通过调整MPT胶体探针的表面化学性质，我们可以控制探针在每个结构域中的停留，从而使我们能够独立地探测每个相。我们的结果显示了每个域中探针动力学的明显差异。在某些情况下，对于相同的探头尺寸但表面化学性质不同，均方位移（MSD）可能相差四个数量级以上。羧基化的探针表面化学性质导致“打滑”的探针，而普通的聚苯乙烯探针似乎束缚在纳米乳液凝胶网络上。我们还观察到羧化探针在凝胶孔之间的探针跳动。我们的方法表明，具有不同表面化学性质的探针可用于探测胶体凝胶的局部区域，并允许测量结构异质水凝胶中的局部性质。我们还观察到羧化探针在凝胶孔之间的探针跳动。我们的方法表明，具有不同表面化学性质的探针可用于探测胶体凝胶的局部区域，并允许测量结构异质水凝胶中的局部性质。我们还观察到羧化探针在凝胶孔之间的探针跳动。我们的方法表明，具有不同表面化学性质的探针可用于探测胶体凝胶的局部区域，并允许测量结构异质水凝胶中的局部性质。

更新日期：2017-09-15

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