Hydrogels, hydrophilic polymer networks mimicking biological tissues, hold great potential in biomedical applications such as electronic skin, tissue engineering, and biosensors. However, conventional hydrogels often struggle to concurrently achieve high strength, modulus, toughness, and fracture resistance, while dehydration and low‐temperature crystallization further limit their utility. Here, a biomimetic gradient bond‐breaking strategy is proposed to address these challenges. By constructing a hydrogel with covalently crosslinked hierarchical reinforcing phases—crystalline domains and self‐assembled aramid nanofibers (ANFs) networks—within the aqueous‐poor phase, preferential covalent bond rupture is enabled to enhance modulus, while hydrogen bond‐rich nanocrystalline domains and ANFs networks synergistically improve toughness. This mechanism yields fracture‐resistant properties akin to dry‐state materials, achieving a modulus of 12.4 MPa, toughness of 73.66 MJ m ^{− 3} , and fracture toughness of 268.8 kJ m ^{− 2} at 70% water content—surpassing all reported PVA‐based hydrogels and even natural structural materials like tendon and spider silk. The mechanical properties are tunable via fabrication parameters, and the hydrogel exhibits broad‐temperature stability, high conductivity, and cytocompatibility. Leveraging these attributes, a low‐temperature‐operable strain sensor is developed for real‐time, accurate monitoring of human motion. This work advances the design of hydrogels with exceptional mechanical and functional properties for flexible electronics.

Plant tendrils exhibit intriguing tropism motions like bending, twisting, and coiling. Herein, we report the application of a liquid crystal elastomer (LCE) to make a light-sensitive and biomimetic coil to replicate behaviors of plant tendrils. The LCE coil consists of diacrylate azobenzene, diacrylate mesogens, and thiol-based spacers. These components are first mixed to form a highly viscous prepolymer solution through a thiol-acrylate Michael addition reaction. Subsequently, an extrusion–rolling process is developed to draw the viscous solution into a coil, which is mechanically stretched in a single direction to align mesogens in the LCE. Finally, the coil is photopolymerized under UV light to form an LCE coil with a diameter of 375 µm. The LCE coil possesses good rigidity and flexibility and shows movement upon light exposure. For example, the LCE coil shows a reversible bending up to 120° to 365 nm UV and 30% contraction to 455 nm visible light, respectively, due to trans-cis photoisomerization of azobenzene derivatives. When the coil is irradiated with UV light with an intensity up to 10 mW cm⁻², it can twist and coil up. It can also wrap around the UV light tube in 6 s, similar to a plant tendril. This type of light-responsive coil has great potential in making biomimetic plants or soft robotics.

The development of advanced multispectral stealth technology plays a vital role in enhancing the survivability of combat platforms. In this paper, a novel design of metamaterial structure based on laser-induced graphene (LIG) that enables bi-stealth compatibility in both infrared and radar regions is proposed and experimentally validated. The structure features a layered design, consisting of an infrared shielding layer (IRSL) and a radar absorption layer (RAL). Specifically, the IRSL layer is structured as an array of Indium Tin Oxide (ITO) based square patches, provides low infrared emissivity and high microwave transparency. While, the RAL is fabricated using LIG technology. which provides excellent radar-absorbing properties through its porous, conductive, and tunable electromagnetic characteristics. The proposed design demonstrates exceptional broadband absorption performance, with an absorption rate exceeding 90% in a range of 2.42 ~ 16.2 GHz, and a relative absorption bandwidth of 148%, which aligns well with simulated results. Additionally, the structure with a low infrared emissivity of 0.26 in the infrared range from 8 to 14 μm. By integrating an LIG-based RAL with a low-emissivity IRSL, this design overcomes the limitations of traditional single-mechanism approaches to multispectral detection, offering new perspectives for the further development of multispectral stealth technology.