Xiao Chen

This study serves as a guide to the development of a polydimethylsiloxane (PDMS)‐encapsulated liquid metal‐MXene aerogel, which has proven to be highly effective for electromagnetic wave absorption, particularly in saline environments. Through directional freezing and casting techniques, we have optimized the sample to exhibit enhanced absorption properties, achieving a reflection loss peak of −63.10 dB at 14.36 GHz. Variations in liquid metal content were found to significantly impact the complex permittivity of the aerogel, resulting in decreases observed in both real and imaginary components. This underscores the crucial role of conductivity in electromagnetic wave damping. Simultaneously, increases in tangent loss and attenuation constant highlight the vital contribution of MXene towards dissipating electromagnetic energy. Our best sample exhibits enhanced mechanical robustness, as evidenced by a high tensile modulus of 1 MPa. Notably, this exceptional performance is sustained for an extended period of 4 weeks even under harsh conditions such as high temperature, acid mist exposure, alkaline exposure, and immersion in synthetic seawater. By testing the thermal camouflage performance, samples achieved processable and efficient camouflage performance at multiple temperatures. This comprehensive dataset confirms the adaptability of the PDMS‐encapsulated liquid metal‐MXene aerogel as an effective solution for electromagnetic wave absorption in challenging environmental scenarios.

As military power advances in the realm of information warfare, stealth technology has become a critical area of research for its effectiveness to evade detection. However, achieving high performance of compatible stealth across different functional mode bands remains a significant challenge. In this study, drawing inspiration from plant bionics, concepts of the directional freezing process are applied to develop a liquid metal‐MXene‐based hierarchical aerogel with radar‐infrared compatible camouflage. With a density of only 4.4 mg cm⁻³, the maximum reflection loss can reach −73.2 dB, and the absorption bandwidth can be adjusted up to 7 GHz. Following a thermal camouflage durability test, the sample successfully lowers the target's temperature from 400 to ≈160 °C. Remarkably, this temperature remains stable even after 180 days of exposure. Additionally, the material's ease of machining enables shape‐shifting camouflage capabilities, allowing objects to transform and resemble harmless items, thereby blending seamlessly with their surroundings. This breakthrough in compatibility performance signifies a substantial leap forward in multifunctional stealth technology development. It not only introduces innovative concepts, but also provides technical support, catalyzing further advancement in this field.

Multifunctional strain sensors simultaneously satisfy all the requirements including flexibility, stretchability, biocompatibility and high responsibility to external stimuli are always in high demand for wearable electronics. In this work, we introduced modified bacterial cellulose nanofibers (BCNF) as double network hydrogel-reinforced substrates to prepare MXene-based strain sensor (MPCB). The well-percolated BCNF play important role to reinforce the polymer skeleton and induce the continuous MXene-MXene conductive paths. Consequently, the electrical conductivity was significantly improved and excellent mechanical properties were retained (with the elongation at break over 500%). The prepared hydrogel can act as a wearable sensor for human motion detection, including swallowing movements, finger bending, and wrist bending. They also exhibit promising applications with multiple characteristics, i.e., ideal EMI, adjustable flexibility, self-healing and self-adhesive performance. Our work provides a simple and practical strategy for a new generation of wearable electronic sensor devices.

Virtual Observatory (VO) is a data-intensively online astronomical research and education environment, which takes advantages of advanced information technologies to achieve seamless and global access to astronomical information. AstroCloud is a cyber-infrastructure for astronomy research initiated by Chinese Virtual Observatory (China-VO) project, and also a kind of physical distributed platform which integrates lots of tasks such as telescope access proposal management, data archiving, data quality control, data release and open access, cloud based data processing and analysis. It consists of five application channels, i.e. observation, data, tools, cloud and public and is acting as a full lifecycle management system and gateway for astronomical data and telescopes. Physically, the platform is hosted in six cities currently, i.e. Beijing, Nanjing, Shanghai, Kunming, Lijiang and Urumqi, and serving more than 17 thousand users. Achievements from international Virtual Observatories and Cloud Computing are adopted heavily. In the paper, backgrounds of the project, architecture, Cloud Computing environment, key features of the system, current status and future plans are introduced.