Producing lightweight,mechanically strong,ductile,and biocompatible materials remains a significant challenge in material engineering due to the conflict between structural and mechanical features.Inspired by the“bri...Producing lightweight,mechanically strong,ductile,and biocompatible materials remains a significant challenge in material engineering due to the conflict between structural and mechanical features.Inspired by the“brick-and-mortar”structure of nacre,a construction with a naturally optimized structure-performance-function relationship,this study developed silk fibroin(SF)nacre as a silk protein-based nacre by integrating ice-templating and thermoplastic molding techniques.SF nacres are similar to natural nacre in microstructure,and their strength and toughness are even superior to natural nacres.These mechani-cal properties permit machining by extreme processing techniques,such as ion beam lithography.Furthermore,SF nacre can be used to modulate the polarization of laser beams and generate bright structural colors.Biocompatibility,mechanical robustness,good processability,and tunable coloration allow SF nacres to be used as a plastic replacement for structural engineering and biomedical use,showing promising advancement of such implantable devices towards clinical translation.展开更多
Yarn-based strain sensors(YSSs)have shown great promising in the fabrication of wearable devices for their good comfortability and fexible designability.However,the false signals generated by the changes in the yarn s...Yarn-based strain sensors(YSSs)have shown great promising in the fabrication of wearable devices for their good comfortability and fexible designability.However,the false signals generated by the changes in the yarn structure of the YSSs are usually ignored.In this study,the generation,the characteristic,and the prediction of these signals were investigated.We recognized that these signals are composed of two negative pseudo peaks and a spurious resistance response plateau.These responses are found to have nothing in common with a true tensile strain,but be attributed to plastic deformation of the fbers.This is due to the fact that the deformation of YSSs exceeds the linear elastic range of the fbers.Although the use of pure elastic fbers can eliminate the spurious resistance response plateau,it will lead to an increase in the pseudo peak to the value compared with a true strain signal peak.Hence,a theoretical model was established to decouple the real signals from the false responses,ensuring the high sensing accuracy of YSSs for applications in wearable devices and artifcial intelligence interfaces.This work provides an in-depth understanding of the response of the YSSs,which might provide inspiration and guidance in the design of high-accuracy fber-based strain sensors.展开更多
基金supported by the National Natural Science Foundation of China(nos.51973116,21935002,52003156)the China Postdoctoral Science Foundation(2020M681344)+1 种基金the starting grant of ShanghaiTech University.Materials were tested at Analytical Instrumentation Center(#SPST-AIC10112914)the Center for High-resolution Electron Microscopy(CћEM),SPST,ShanghaiTech University.
文摘Producing lightweight,mechanically strong,ductile,and biocompatible materials remains a significant challenge in material engineering due to the conflict between structural and mechanical features.Inspired by the“brick-and-mortar”structure of nacre,a construction with a naturally optimized structure-performance-function relationship,this study developed silk fibroin(SF)nacre as a silk protein-based nacre by integrating ice-templating and thermoplastic molding techniques.SF nacres are similar to natural nacre in microstructure,and their strength and toughness are even superior to natural nacres.These mechani-cal properties permit machining by extreme processing techniques,such as ion beam lithography.Furthermore,SF nacre can be used to modulate the polarization of laser beams and generate bright structural colors.Biocompatibility,mechanical robustness,good processability,and tunable coloration allow SF nacres to be used as a plastic replacement for structural engineering and biomedical use,showing promising advancement of such implantable devices towards clinical translation.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.51973116,U1832109,21935002,52003156)the Users with Excellence Program of Hefei Science Center CAS(2019HSC-UE003)+1 种基金China Postdoctoral Science Foundation(2020M681344)the starting grant of ShanghaiTech University,and State Key Laboratory for Modifcation of Chemical Fibers and Polymer Materials.
文摘Yarn-based strain sensors(YSSs)have shown great promising in the fabrication of wearable devices for their good comfortability and fexible designability.However,the false signals generated by the changes in the yarn structure of the YSSs are usually ignored.In this study,the generation,the characteristic,and the prediction of these signals were investigated.We recognized that these signals are composed of two negative pseudo peaks and a spurious resistance response plateau.These responses are found to have nothing in common with a true tensile strain,but be attributed to plastic deformation of the fbers.This is due to the fact that the deformation of YSSs exceeds the linear elastic range of the fbers.Although the use of pure elastic fbers can eliminate the spurious resistance response plateau,it will lead to an increase in the pseudo peak to the value compared with a true strain signal peak.Hence,a theoretical model was established to decouple the real signals from the false responses,ensuring the high sensing accuracy of YSSs for applications in wearable devices and artifcial intelligence interfaces.This work provides an in-depth understanding of the response of the YSSs,which might provide inspiration and guidance in the design of high-accuracy fber-based strain sensors.
