Bio‐inspired multi‐scaled (hierarchical) porous structures have remarkable strength and stiffness‐to‐density properties. Direct ink writing (DIW) or robocasting, an additive manufacturing (or also commonly known as 3D printing) material extrusion technique is able to create near‐net‐shaped complex geometries. A new approach of combining DIW, colloidal particle‐stabilized emulsion paste inks and partial densification to create tailored architectures of hierarchical porosity on three scales has been demonstrated. The printed and sintered ceramic lattice structures possess relatively high overall porosity of 78.7% (on average), comprising mainly (64.7%) open porosity. The effects of formulation (surfactant and oil concentrations, solids particle size, and mixing speed) on rheology and pore size and morphology have been investigated. The rheological properties (storage modulus, yield stress, and recovery of storage modulus) of the emulsions have been found to delineate the samples with good shape retention from those that slump. Additionally, the internal features of the sintered structures have been analyzed via X‐ray tomography and scanning electron microscope. The role of emulsion stability on printability and the internal structure of the prints has been investigated.

中文翻译：

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分层多孔氧化铝稳定乳液的直接墨水书写：流变性和可印刷性

受生物启发的多尺度（分层）多孔结构具有出色的强度和刚度-密度特性。直接墨水书写（DIW）或机器人广播，一种增材制造（或也称为3D打印）材料挤压技术，能够创建接近最终形状的复杂几何形状。已经证明了一种结合DIW，胶体颗粒稳定的乳液糊状油墨和部分致密化以创建三个级别的量身定制的分层孔隙结构的新方法。印刷和烧结的陶瓷晶格结构具有相对较高的总孔隙率（平均），为78.7％，主要包括（64.7％）开放孔隙率。研究了配方（表面活性剂和油的浓度，固体颗粒的大小和混合速度）对流变学，孔径和形态的影响。已发现乳液的流变性质（储能模量，屈服应力和储能模量的恢复）可以使样品具有良好的形状保持性和坍落度。此外，还通过X射线断层扫描和扫描电子显微镜分析了烧结结构的内部特征。已经研究了乳液稳定性对可印刷性和印刷品内部结构的作用。