The 3D-printed ceramic catalyst has a broad range of application prospects. Notably, the ZIF-67-loaded 3D-printed ceramic catalyst demonstrates exceptional catalytic performance and a high degree of structural design flexibility. However, the ceramics prepared by the direct loading of ZIF-67 onto ceramic substrates during 3D printing show insufficient catalytic stability. In this study, aluminum phosphate (AP) was used as a binder to enhance the adhesion between ZIF-67 and the Al2O3 ceramic support surface, thereby reducing ZIF-67 shedding and preventing the degradation of the catalytic performance of the 3D-printed ceramic catalyst. Consequently, after six cycles, the conversion rate of 4-nitrophenol with ZIF-67/Al2O3 decreased by 31%, whereas that with ZIF-67@AP/Al2O3 decreased by only 5.4%. The reasons for the high catalytic stability of ZIF-67@AP/Al2O3 were comprehensively and meticulously investigated. The proposed synthesis strategy, which utilizes AP to facilitate the bonding of ZIF-67 to the Al2O3 ceramic scaffold, offers a novel approach for enhancing the catalytic stability of 3D-printed ceramic catalysts loaded with active species through self-growth methods. This approach is expected to guide future research on efficient catalytic systems for various applications.

Ionically conductive double network hydrogel is proposed and used as strain sensors to monitor various motions of human body.

The three-dimensional (3D) printing of a SiO₂-filled thermosetting polyimide (SiO₂@TSPI) composite with outstanding performance is realized via the direct ink writing (DIW) of polyamide acid (PAA) composite ink and thermal treatment conducted thereafter. The composite ink consists of phenylethynyl-terminated PAA and silica nanoparticles, where the SiO₂ nanoparticles serve as the rheology modifier that is necessary for the DIW technique to obtain self-supporting feedstock during 3D printing and the reinforcement filler that is used to enhance the performance of the final composite. As a result, printed parts with complex geometry and robust thermal stability are obtained. Due to the extrusion-based DIW technique, the printed structures exhibit anisotropic mechanical strength that highly depends on printing roads. This simple and convenient means of realizing 3D structures of thermosetting polyimides is a promising strategy in aerospace and other fields.