Nano ribbon build pulse generator driven friction bionanofibers

The strongest available in the world\’s thinnest material is what? Of course, the graphene! Called \”King of materials\” it is only the thickness of a single layer 0.34 nm. State Key Laboratory of 2018 East China University of fibrous material modified Zhang Yaopeng team using NaOH / urea system is peeled off from the silk in a \”nano ribbon\” , a thickness of only 0.4 nm, almost equal \” King of materials \”(ACS Nano, 2018,12,11860). To play the \”nano ribbon\” ultra-thin, super-tough, high transparency, excellent performance, has Zhang Yaopeng, team Fansu Na Another system employed (sodium hypochlorite / sodium bromide / the TEMPO), again from silk the release layer having a thickness of about 0.4 nm monomolecular \”nano ribbon\”, and as primitives to build a full fibroin bio-nano-yl friction generator. Because of the special structure of nano ribbon, the device is not only biodegradable silk, and the use of a weak body driving power to the pulse, to achieve a self-powered implantable devices degradable, which exhibits biological pacemaker electronics, application of the potential energy of the human body, but also proved that \”nano ribbon\” self-assembled or ordered constructs, can be used as building blocks or directly enhancing ingredients, prepared silk fibroin is excellent in the performance-based functional materials. Internationally renowned journal \”Nano Energy\” (nano – Energy) reported the important results (Pulse-Driven Bio-Triboelectric Nanogenerator Based on Silk Nanoribbons) in their entirety. The first author of the study as a doctoral cow owe less , co-corresponding author for the Dr. Fan Suna.

纳米丝带构筑脉搏驱动的生物纳米摩擦发电机
FIG. 1 nanometer ribbon drive pulse may be bio-nano-yl friction generator

Silk has excellent mechanical properties, good biocompatibility, low inflammation and controlled degradation rate. Many excellent properties of silk fibroin with a multistage structurally related, particularly at the nanoscale, natural silk fibril structure has an important impact on its performance. Compared with regenerated silk fibroin, using the mechanical properties of \”top-down\” Direct release obtained silk fibroin silk retains the microstructure of natural silk, silk fibroin imparting base material is excellent. Friction generator nano(TENG) mechanical energy into electrical energy, while real-time monitoring of micro-movements of the human body, collecting energy to achieve self-powered. For biological implantable electronic devices, biocompatibility, biodegradability and degradation rate are controllable TENG essential properties. SF is an insulator, static electricity and easy to produce, is prepared TENG natural biological material. TENG output performance is affected by the ability of the electronic gains and losses friction layer. Electrostatic spinning the regenerated silk fibroin fiber mats or regenerated silk fibroin film with synthetic polymers, it has been used to prepare TENG. However, such multi TENG conductive layer of ITO or aluminum foil, can not be degraded in vivo, and poor biocompatibility, easily lead to inflammation. Regenerated silk fibroin membrane, rice paper TENG is prepared can also be used, but the output to be improved performance and stability. Nano ribbon prepared in the present work only the thickness of a monomolecular layer, mainly composed of natural silk β- pleated sheet natively, the random coil conformation, and α- helical configuration. Researchers by atomic force microscopy (AFM), transmission electron microscopy (TEM), synchrotron X-ray diffraction characterization techniques confirmed the above information (FIG. 2).

纳米丝带构筑脉搏驱动的生物纳米摩擦发电机
FIG. 2 Nano ribbon (a) TEM FIG, (b) AFM FIG.; (C) width profile and (d) a thickness of FIG.
纳米丝带构筑脉搏驱动的生物纳米摩擦发电机
FIG 3 nm film ribbon high transparency and high biocompatibility

were used and nano-suspension ribbon silk fibroin aqueous solution as raw materials, a nano-film ribbon (SNRF) and the regenerated silk fibroin prepared membrane protein (RSFF). Schwann cells by culturing in SNRF and RSFF, to verify its excellent biocompatibility (FIG. 3). SNRF use as a friction layer and RSFF, magnesium as the conductive layer, after some aftertreatment regenerated silk fibroin film (RSFF-p) as a wrapping layer, the preparation of bio-degradable silk TENG is full (in FIG. 4). After treatment by changing the wrap layer may be adjusted TENG is degradation rate. Since the difference between the two silk membrane structure having different work functions, so that the two films in contact with the external force, SNRF positively charged, the RSFF negatively charged, thereby generating an electrical signal. Nano ribbon film having flexibility and strength, gives the device sensitivity, stability and durability. 5, when the external resistance of 100 MΩ, the maximum output voltage of 41.64 V TENG. With other implanted in vivo as compared TENG fully degradable, which has an excellent output performance TENG, the maximum output power can reach 86.7 mW / m 2 . TENG and has a high sensitivity, pulse rate may be monitored. Further, TENG is soaked in PBS buffer 114 days 37 ° C, the degradation rate of 63%. Such TENG implant body, is expected to monitor internal organs small movements, and other implanted devices is energized, the degradation of the last amino acid the body can absorb and magnesium ions in vivo.

纳米丝带构筑脉搏驱动的生物纳米摩擦发电机
FIG. 4 (a) nano ribbon film and (b) regenerated silk fibroin film optical image; (c) TENG schematic; (d) Nano ribbon film, and (e) regenerated silk fibroin when AFM three-dimensional view of a film friction surface
纳米丝带构筑脉搏驱动的生物纳米摩擦发电机
FIG. 5 (a) external resistance 100 MΩ, TENG output voltage; (b) the external force to the output voltage; ( c) different external, TENG is output performance; (D) TENG stability and durability; (e) compared with the output performance in the literature TENG; (f) monitoring the pulse rate in real time

this work was a project of the national Natural Science foundation of China, national key R & D program, Shanghai Science and technology Committee of the international joint Fund, Shanghai advanced all the way along the fiber and low-dimensional materials international joint laboratories, basic university research center operating expenses and Donghua University graduate student innovation fund funding. Part of the work was completed in Shanghai synchrotron radiation source line BL15U station. Huang Lee PhD, and Professor Lv Shasha SHAO Hui-li is co-author. Original link: https: //doi.org/10.1016/j.nanoen.2020.104837

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