In this study, the diffusion‐induced external gelation is combined with a microfluidic technique to prepare monodisperse ZrO₂ ceramic microspheres. The gelation of sol droplets is traced by fluorescence visualization of the local pH, and it illustrates the effect of the external concentration of triggering agent (tetramethylethylenediamine, TMEDA) on the formation of the gel network, which results in 3 kinds of deformation of the gel particles. The deformation mechanism mainly lies in the imbalanced Laplace pressure exerted on the gel network during the competition between the gelation and the drying processes. By regulating the concentration of TMEDA, the monodisperse ZrO₂ ceramic microspheres with high sphericity can be readily fabricated.

中文翻译：

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具有受控形貌的陶瓷微球的微流体制备

在这项研究中，将扩散诱导的外部凝胶化与微流体技术相结合，以制备单分散的ZrO ₂陶瓷微球。溶胶液滴的凝胶化通过局部pH值的荧光可视化进行追踪，它说明了触发剂（四甲基乙二胺，TMEDA）的外部浓度对凝胶网络形成的影响，这导致了3种凝胶变形粒子。变形机理主要在于在凝胶化和干燥过程之间的竞争过程中施加在凝胶网络上的不平衡拉普拉斯压力。通过调节TMEDA的浓度，可以容易地制备具有高球形度的单分散ZrO ₂陶瓷微球。