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.

中文翻译：

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高内相 Pickering 乳液综述：稳定性、流变学和 3D 打印应用

高内相皮克林乳液 (HIPPE) 以其极高的内相体积分数而闻名，可产生絮凝但变形的乳液液滴以及独特的流变行为，如剪切稀化特性、粘弹性和触变恢复性。除了常规乳液系统的固有特征（例如大界面面积和两种不混溶液体的良好混合）之外，HIPPE 已成为使用挤出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。基于3D打印技术，使得3D打印的HIPPE支架引起了食品科学、生物技术、环境科学和能量转移等各个领域的广泛兴趣。本文综述了制备合适的 HIPPE 作为各种应用领域的 3D 打印墨水的最新进展。本工作从HIPPEs的稳定机制入手，介绍其独特流变行为的起源以及调整流变行为的策略，以制备更适合用作印刷油墨的HIPPEs。然后，讨论了基于挤出的 3D 打印和 HIPPE 作为构建块之间的兼容性，随后总结了基于 3D 打印的 HIPPE 支架的潜在应用。最后，提出了使用基于挤出的 3D 打印制备 HIPPE 材料的局限性和未来前景。