Chunze Yan

3Y‐tetragonal zirconia polycrystals (TZP) ceramics are widely used for dental restorations due to their biocompatibility. However, subtractive manufacturing suffers from severe material waste, while existing vat photopolymerization struggles to balance densification with microstructural control due to high organic content and light scattering. This study presents a combined approach integrating material jetting (MJ) and SiC‐assisted hybrid microwave sintering (HMS). By tuning the multi‐solvent system and dispersion kinetics, a highly stable 3Y‐TZP ceramic ink with a low organic content of approximately 4 wt% was developed with optimized rheological behavior. This lean‐binder formulation enabled a rapid HMS schedule that achieved densification while limiting grain coarsening through shortened high‐temperature exposure. Compared to conventional sintering, this approach achieved rapid densification to a near‐theoretical density of 6.04 g/cm ³ within 2 h while significantly refining the grain size. Consequently, samples processed by HMS at 1450°C exhibited outstanding comprehensive properties, achieving a bending strength of 1086.5 MPa and a Vickers hardness of 13.01 GPa, whereas the optical transmittance increased to 36.2% at 1500°C. To demonstrate the application potential of this process, ultrathin dental veneers (∼100 µm) featuring fine surface microstructures were successfully fabricated. Ultimately, this combined MJ–HMS approach demonstrates a high‐resolution and rapid additive manufacturing strategy for customized zirconia dental restorations.

Structures prepared through 4D printing, an innovative additive manufacturing technology, can respond to external stimuli and attain automatically controllable shape or structural changes over time. The combination of 4D printing and continuous fiber-reinforced polymer composites provides new ideas for realizing composite structures with customized functions. Here, a 4D printing method for electrically actuated continuous fiber-reinforced composite sandwich structure (CFRCSS) that combines lightweight characteristics and shape memory effect was developed based on fused deposition modeling process. Firstly, the anisotropic mechanical properties and dynamic thermomechanical properties of 4D printed CFRCSS were characterized. Afterwards, the heat and electricity induced shape memory effect were investigated. Finally, an intelligent composite Miura origami structure was designed, and the actuation and deformation process of the structure under electric heating were realized. The Young's modulus, tensile strength, flexural modulus and strength of the electrically actuated composite sandwich structure were 9.76 GPa, 117.1 MPa, 3.22 GPa and 71.1 MPa, respectively. For the heat induced shape memory effect of continuous carbon fiber-reinforced composite sandwich structures, the maximum shape recovery ratio of 97.73% was achieved when the carbon fiber infill direction was 0°. In addition, the electricity induced shape fixation ratio and recovery ratio of the composite sandwich structure reached 92.78% and 95.61%, respectively. Furthermore, the parameter simulation results that characterize the shape memory effect were consistent with the experimental values, with a relative error of 2.53%. This study provides a theoretical basis and technical support for the design and manufacturing of 4D printed CFRCSS and intelligent structures.

Advanced radar systems require electromagnetic wave (EMW) absorbers that can function reliably in extreme conditions. SiC-based absorbers exhibit excellent high-temperature resistance and chemical stability; yet, achieving low-frequency compatible ultra-broadband electromagnetic absorption remains a significant challenge. Herein, we propose a material-structure-function integrated strategy to design and fabricate a biomimetic SiC/mullite metamaterial with low-frequency compatible ultra-broadband EMW absorption using laser powder bed fusion (LPBF) technology. Specifically, by employing a microscopic non-magnetic hetero-interfacial polarization strategy, achieving a tunable effective absorption bandwidth (EAB) covering the entire 2–18 GHz range by adjusting the matching thickness within 6 mm. The incorporation of macroscopic hybrid 2D/3D honeycomb metamaterial designs highly expanded the EAB to 3.11–40 GHz (RL＜–10 dB). Such a strategy results in the fabricated metamaterial with high oxidation resistance at high temperatures, enabling it to retain stable absorption performance even after oxidation at 1200 °C, which indicates its readiness for use in extreme thermal applications. This work extends the additive manufacturing of high-performance EMW-absorbing metamaterials through a material-structure-function integrated strategy, while also significantly advancing the development of environmentally adaptive absorbers.

The properties of poly(L‐lactic acid) (PLLA) are strongly influenced by its polymorphic crystal structures. This study investigates the isothermal crystallization behaviors of PLLA during the laser powder bed fusion (LPBF) process and establishes the correlations with the mechanical properties of the PLLA lattice. It is found that the evolution of PLLA crystal polymorphs exhibits a strong dependence on the powder bed temperature ( ). A dual‐Avrami model is developed to predict the isothermal crystallization kinetics of PLLA, successfully describing the primary and secondary crystallization stages with prediction errors confined within −0.072 to 0.025. Meanwhile, a crystallization‐free threshold model is first proposed to extrapolate and identify 130°C as the practically optimal within the processable window. At 130°C, the grain sizes (homogeneous crystallization size) and (normal crystallization size) of the α phase reach 56.58 and 26.51 nm. Compared to the baseline at 101°C within the actual sintering window, the crystallinity increases from 23.46% to 34.93%. Correspondingly, the compressive strength and Young's modulus exhibit remarkable enhancements of 387.09% and 362.23%, respectively. A framework is established to correlate the evolution of / phase under varying with tailored mechanical responses. This paper lays the groundwork for optimizing the crystal structure‐processing‐properties relationship of personalized PLLA scaffolds.

High-load structural materials inherently transmit vibrations with high efficiency, leading to a fundamental trade-off between load-bearing capacity and vibration isolation, particularly in practical engineering environments such as large-scale machinery applications. This trade-off is especially evident in porous structures represented by triply periodic minimal surface (TPMS) lattices. These structures offer high specific strength and lightweight load-bearing capacity yet lack adequate low-frequency vibration isolation, with their mechanical and damping performances strongly volume fraction-dependent. Bioinspired by cat paw pads, we proposed a novel strategy integrating topological discretization with a viscoelastic interpenetrating phase to address this challenge. Results show that the TPMS-Gyroid lattices with 1–8 interlacing cells were fabricated via laser powder bed fusion at a constant volume fraction and infiltrated with silicone rubber. Multi-path load transfer enables uniform stress distribution, silicone rubber constrains strut deformation, enhances energy absorption, and extends fatigue life through interfacial friction and viscoelastic dissipation. Shaker tests confirm improved low-frequency vibration level difference (VLD) via lowered natural frequency and enhanced damping ratio. Experimental validation in a ship propulsion shaft system demonstrates the hybrid metamaterial achieves 39 dB VLD at 55 Hz and up to 1201% higher vibration attenuation than solid bearings under realistic axial displacements, while maintaining excellent load-bearing performance. These results provide a scalable design approach for high-load, low-frequency vibration isolation in large-scale machinery, automated industry, and electronic devices.

More than one-third of the global population suffers from dental defects, with osseointegrated implants being the gold-standard intervention; yet, their long-term functional performance is hindered by peri-implantitis. Here, we present an autonomous piezoelectric implant that delivers adaptive antibacterial and anti-inflammatory functionalities through physiological occlusal activation without any external intervention. The implant demonstrates good functional durability, sustaining consistent bioelectric outputs through over 1,000,000 loading-unloading cycles and exhibiting stable electrical performance in simulated physiological environments for over 30 days. Besides, integration with machine learning enables reliable, patient-specific prediction and real-time modulation of occlusal mechano-adaptive voltage responses. The autonomous implant achieves tri-modal therapeutic integration: (ⅰ) electrocatalytic bactericidal activity via controlled reactive oxygen species generation, (ⅱ) electrically induced immunomodulation of macrophages from pro- to anti-inflammatory phenotypes, and (ⅲ) electrostimulation-enhanced osteogenesis surpassing conventional titanium alloys, both in vitro and in vivo. These findings provide insights for occlusion-activated effective peri-implantitis intervention and a widely applicable strategy for developing autonomous and adaptable bioelectronic platforms.

Cellular solids ubiquitously exist in natural systems and are crucial for living organisms^1,2. Their unique smooth branch and node morphologies are often seen as adaptations for enhanced mechanical performance^3,4. Exploring alternative evolutionary functions can enrich the understanding of cellular solids, but it is frequently neglected. Here we show that the biomineralized cellular solids in echinoderm stereom (for example, sea urchin spine) have unexpected mechanoelectrical perception with response potential and response time, both of which are one to three orders of magnitude greater than those of echinoderm vision⁵. This exceptional perception originates from the gradient cellular solids (with varying void- or solid-phase diameters) along the [001] spine axis, generating a differential charge density across the stereom surface during liquid flow. Inspired by this natural wisdom, we create artificial spine-like structures using three-dimensional printing technology that exhibit three-fold higher voltage output and eight-fold greater amplitude differential than gradient-free samples, as well as a nature-inspired metamaterial mechanoreceptor capable of time-resolved self-monitoring information underwater. Our findings advance the understanding of load-sensitive biomimetic cellular solids (such as wood, sponge and trabecular bone), with the potential to develop functional gradient cellular materials towards underwater spatiotemporal sensing and water resource utilization.