高内相Pickering乳液（HIPPE）以其非常高的内相体积分数而闻名，导致絮凝但变形的乳液液滴和独特的流变行为，如剪切稀化性质，粘弹性,和触变恢复。除了常规乳液系统的固有特性外，例如大的界面面积和两种不混溶的液体的充分混合，HIPPE已成为使用基于挤出的3D打印技术构建具有定制结构和可编程功能的三维（3D）支架的构建模块，制造3D打印的基于HIPPE的支架吸引了食品科学等各个领域的广泛兴趣，生物技术，环境科学,和能量转移。在这里，综述了制备合适的HIPPE作为各种应用领域的3D打印油墨的最新进展。这项工作始于HIPPE的稳定机制，然后介绍了它们独特的流变行为的起源和调整流变行为的策略，以制备更多合格的HIPPE作为印刷油墨。然后，讨论了基于挤出的3D打印和作为构建块的HIPPE之间的兼容性，其次是使用3D打印的基于HIPPE的支架的潜在应用的总结。最后,提出了使用基于挤出的3D打印制备HIPPE基材料的局限性和未来前景。
High internal phase Pickering emulsion (HIPPE) is renowned for its exceptionally high-volume fraction of internal phase, leading to flocculated yet deformed emulsion droplets and unique rheological behaviors such as shear-thinning property, viscoelasticity, and thixotropic recovery. Alongside the inherent features of regular emulsion systems, such as large interfacial area and well-mixture of two immiscible liquids, the HIPPEs have been emerging as building blocks to construct three-dimensional (3D) scaffolds with customized structures and programmable functions using an extrusion-based 3D printing technique, making 3D-printed HIPPE-based scaffolds attract widespread interest from various fields such as food science, biotechnology, environmental science, and energy transfer. Herein, the recent advances in preparing suitable HIPPEs as 3D printing inks for various applied fields are reviewed. This work begins with the stabilization mechanism of HIPPEs, followed by introducing the origin of their distinctive rheological behaviors and strategies to adjust the rheological behaviors to prepare more eligible HIPPEs as printing inks. Then, the compatibility between extrusion-based 3D printing and HIPPEs as building blocks was discussed, followed by a summary of the potential applications using 3D-printed HIPPE-based scaffolds. Finally, limitations and future perspectives on preparing HIPPE-based materials using extrusion-based 3D printing were presented.
