The rapid development of next‐generation portable electronic devices urgently requires dual‐functional materials that possess both efficient heat dissipation and outstanding electromagnetic interference (EMI) shielding performances. In this study, anisotropically oriented carbon films with high thermal conductivity and excellent EMI shielding properties are prepared through an innovative glucose hydrogel‐controllable carbonization method. The horizontal alignment of nanocrystalline graphite results in oriented structures with an extremely high in‐plane thermal conductivity of 439.9 W m−1 K−1, exhibiting a more effective heat‐dissipating capacity on smartphones than their commercial graphite counterparts. Additionally, owing to multiple internal reflections arising from the oriented structures, the films exhibit an EMI shielding effectiveness (SE) of 21.72 dB at an ultrathin thickness of 480 nm in the X‐band and an extraordinarily high absolute shielding effectiveness (SSE/t) of 275 883 dB cm2 g−1, significantly outperforming most of the reported synthetic materials. Furthermore, the flexibility, high mechanical strength, and stability of the films are demonstrated and therefore show promising application prospects. This study offers a facile yet feasible strategy for preparing dual‐functional materials to address the heat emission and EMI problems of advanced electronic devices in a more economical and environmentally friendly manner.
Development of ultra‐stretchable and sensitive soft touch panel is of great importance for broad applications in artificial intelligence, wearable devices, and soft robotics. However, traditional human‐computer interfaces (HCIs) suffer from the discomfort and asynchronous signals in current application scenarios. Herein, a hydrogel‐based self‐healing touch panel, which is highly deformable, and both mechanically and electrically self‐healable, has been successfully developed from a poly(N,N′‐dimethylacrylamide)/silica hydrogel which possesses an ultra‐high stretchability >3800%. A surface‐capacitive touch mechanism is adopted to sense a touched position. The panel can be operated under high areal strain without sacrificing its functionalities. Skin touch panel is constructed and adhered to human skin, with the strong performance and self‐healing ability demonstrated by writing words and playing games.
Abstract. The higher education should follow closely the fast development of modern science and technology. Particularly in those disciplines about engineering and applied sciences, the lessons about state-of-the-art techniques are very important to cultivate the students' innovation ability and capability of solving the complex engineering problems. However, how to effectively teach these contents needs careful considerations. Here, it is demonstrated that the simple calculations can achieve amusing results about the lessons on nanotechnologies such as electrospinning and electrospraying. The surface enlargement effects of nanomaterials including 2-dimensional graphene, 1-dimensional electrospun nanofiber, and 0-dimensional nanoparticle are calculated. All the calculation demonstrate that the magnitude of surface area increase is equal to the magnitude the size decrease. These simple calculations can be good start points for giving lessons about nanotechnologies to college students, can make the courses more vivid, and can provoke the students' interests about new kinds of advanced techniques.
Abstract-The capability of finding and resolving complicated engineering issues is very important for the college students to begin their career. In high school, teachers should take advantage of advanced technologies in two ways. One is to transfer the knowledge and practice experiences to the students and the other is to share with them how to find and resolve the complicated issues. In this paper, with electrospraying as an objective, several complicated issues are put forward. Electrospraying is a simple but very complicated engineering process. When it is exploited to create medicated composite for drug sustained release, complicated issues occur not only at the selections of raw materials, suitable working processes and key parameters, but also at the systematic designs of final functional nanomaterials and smooth implementation of working processes. Advanced technologies can be vivid teaching materials for the students to learn how to refine and resolve complex engineering issues, and thus to foster their practice interests, to improve their innovative and engineering capabilities.
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