At present, the rapid development of artificial intelligence and the emergence of various human-like intelligent robots are one of the basic functions of human and future intelligent machines to explore the physical world. The development of tactile-like bionic electronic skin flexible sensing devices and the realization of devices and softness The mechanical matching between organizations has important scientific significance and application value. Inspired by the ability of fingerprints to sense the surface texture of objects, the Zhang Wei research team of the Institute of Nanotechnology and Nano-Bionics of the Chinese Academy of Sciences, based on previous research (Nano Research 2017, 10(8): 2683-2691), uses both internal and external pyramid sensitivity. Microstructured flexible film substrate and single-walled carbon nanotube conductive film, designed and fabricated laminated structure flexible vibration sensor with wide detection range (45-2500 Pa) and high sensitivity (3.26 kPa-1) (Fig. 1b ). And the model of the vibration frequency of the friction object surface and the surface roughness of the object surface is established: f = v / λ (Fig. 1; v: flexible sensor relative velocity motion; f: vibration frequency; λ: undulation spacing, ie wavelength). The flexible biomimetic fingerprint sensor can be applied to the precise discrimination of the fine texture/roughness of the surface of the object, and the minimum detectable texture of 15 μm×15 μm exceeds the recognition ability of the finger fingerprint (~50 μm×50 μm). Highly sensitive detection and recognition of shear stress and Braille letters can also be achieved. These characteristics will have important potential applications in the tactile perception and intelligent manipulators of robotic electronic skin. The results have been published in Small (2018, 1703902, 1-9; DOI: 10.1002/smll.201703902) and reported by Advanced Science News under the heading A New Bionic Skin; Makes Sense (Figure 2). The first author of the paper is Master student Cao Yudong and Dr. Li Tie. As a flexible wearable electron, the mechanical mismatch between the device and the soft tissue is one of the key scientific issues that need to be addressed in this field. In response to the above-mentioned key scientific problems, the Zhang Wei team recently reported a fibrous super-expanding flexible strain sensor with a pleated nuclear sheath structure. The sensor has high sensitivity in the whole working range, which can be used for both weak and large strains. Good response. Model , , (H: wrinkle amplitude, h: sheath thickness, epre: fiber core pre-strain, ec: critical strain of wrinkle in fiber core material, l: wrinkle wavelength, hs: thickness of sheath monolayer film, n: sheath film The number of layers) is controllably introduced into the pleated structure by a pre-stretch-wrap-release strategy, which contact each other to form an additional contact current path (Fig. 3). The conductive path changes significantly due to wrinkle separation during the stretching of the device, and the sheath is a correspondingly sensitive MWCNT/TPE composite film, so the strain sensor is in a very large strain range (> 1135%) Both have high sensitivity (GF: 21.3, 0%-150%; 34.22, 200%-1135%). These superior properties give the ultra-extended strain sensor the ability to monitor small muscle movements and a wide range of joint movements in real time, as well as for implanted medical applications such as digital assessment of tendon healing (Figure 4). The research results were recently published in Advanced Science (DOI: 10.1002/advs.201800558), and the first author of the article is Ph.D. student Li Lianhui. The above work was supported by the National Natural Science Foundation of China (61574163), Jiangsu Outstanding Youth Fund (BK20170008) and China Post-Fund Foundation (2017M611945). Flex Power Supply,Flex Power Supply 80Plus,700W Adapter Server Power Supply,Flex 700W Power Supply Boluo Xurong Electronics Co., Ltd. , https://www.greenleaf-pc.com
