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DNA vom Spinnrad: Eine Hydrogelfaser aus nicht kovalent vernetzter DNA entsteht durch das Verweben flexibler DNA‐Stränge zu toroidalen Mustern (siehe Schema) in einem einstufigen Nassspinnverfahren, bei dem eine hydrophile ionische Flüssigkeit als Kondensationsmittel und koagulierendes Solvens wirkt. Das Faserinnere besteht aus fehlgeordneten B‐DNA‐Strängen. Die Fasern sind auch in wässrigen Lösungen beständig.

In fiber‐based smart systems, carbon nanotube (CNT) fibers and yarns with coil and twist can impose flexible and stretchable properties in addition to excellent electrical and mechanical properties. They can operate as flexible electronic sensors to monitor human health, actuators like artificial muscles, and in energy storage such as energy harvesters and supercapacitors. In article number 1902670, Seon Jeong Kim and co‐workers discuss such progressive advances of CNT yarns, and consider the future challenges in smart electronic systems.

A surface electromyogram (sEMG) electrode collects electrical currents generated by neuromuscular activity by a noninvasive technique on the skin. It is particularly attractive for wearable systems for various human activities and health care monitoring. However, it remains challenging to discriminate EMG signals from isotonic (concentric/eccentric) and isometric movements. By applying nanotechnology, we provide a coiled carbon nanotube (CNT) yarn-integrated sEMG device to overcome sEMG-based motion recognition. When the arm was contracted at different angles, the sEMG-derived root mean square amplitude signals were constant regardless of the angle of the moving arm. However, the coiled CNT yarn-derived open circuit voltage (OCV) signals proportionally increased when the arm’s angle increased, and presented negative and positive values depending on the moving direction of the arm. Moreover, isometric contraction is characterized by the onset of EMG signals without an OCV signal, and isotonic contraction is determined by both EMG signals and OCV signals. Taken together, the integration of EMG and coiled CNT yarn electrodes provides complementary information, including the strength, direction, and degree of muscle movement. Therefore, we suggest that our system has high potential as a wearable system to monitor human motions in industrial and human system applications.