Electronic fibers used to fabricate wearable triboelectric nanogenerator(TENG) for harvesting human mechanical energy have been extensively explored. However, little attention is paid to their mutual advantages of env...Electronic fibers used to fabricate wearable triboelectric nanogenerator(TENG) for harvesting human mechanical energy have been extensively explored. However, little attention is paid to their mutual advantages of environmental friendliness, mechanical properties, and stability. Here, we report a super-strong, biodegradable, and washable cellulose-based conductive macrofibers, which is prepared by wet-stretching and wet-twisting bacterial cellulose hydrogel incorporated with carbon nanotubes and polypyrrole. The cellulose-based conductive macrofibers possess high tensile strength of 449 MPa(able to lift 2 kg weights), good electrical conductivity(~ 5.32 S cm^(-1)), and excellent stability(Tensile strength and conductivity only decrease by 6.7% and 8.1% after immersing in water for 1 day). The degradation experiment demonstrates macrofibers can be degraded within 108 h in the cellulase solution. The designed fabric-based TENG from the cellulose-base conductive macrofibers shows a maximum open-circuit voltage of 170 V, short-circuit current of 0.8 μA, and output power at 352 μW, which is capable of powering the commercial electronics by charging the capacitors. More importantly, the fabric-based TENGs can be attached to the human body and work as self-powered sensors to effectively monitor human motions. This study suggests the potential of biodegradable, super-strong, and washable conductive cellulose-based fiber for designing eco-friendly fabric-based TENG for energy harvesting and biomechanical monitoring.展开更多
The rapid proliferation of wearable electronics has sparked significant research interest in fabric-based electromechanical sensors for continuous human motion tracking,human-machine interaction,and precision rehabili...The rapid proliferation of wearable electronics has sparked significant research interest in fabric-based electromechanical sensors for continuous human motion tracking,human-machine interaction,and precision rehabilitation.However,the development of environmentally friendly and durable functional fibers or textiles with superior flexibility for fabric-based electromechanical sensors is challenging.In this study,we developed soft and biodegradable magnetic macrofibers using a stretching-twisting method applied to glycerol-plasticized bacterial cellulose(BC)strips embedded with CoFe_(2)O_(4)magnetic nanoparticles.The resulting magnetic macrofibers demonstrated superior mechanical properties,possessing a tensile strength of 33 MPa with a breaking strain of 3.5%while maintaining sufficient structural integrity to sustain a 2 kg load-bearing capacity.Additionally,the macrofibers were fully biodegradable by cellulase within 15 d,leaving only CoFe_(2)O_(4)nanoparticles that could be adsorbed and recovered by magnets.Furthermore,the fabric-based magnetoelectric sensor constructed by integrating a coil and the magnetic fabric woven by macrofibers demonstrated exceptional electromechanical coupling efficiency across an extended operational range(0.5-10 cm coil-to-textile distance).The superior distance sensitivity,stability,and durability of this sensor enabled real-time monitoring of human motion patterns under dynamic conditions.Therefore,BC-based magnetic macrofibers provide a promising strategy for developing eco-friendly and durable electromechanical sensors for sports training and rehabilitation monitoring.展开更多
Cellulose macrofibers (MFs) are gaining increasing interest as natural and biodegradable alternatives to fossil-derived polymers for both structural and functional applications. However, simultaneously achieving their...Cellulose macrofibers (MFs) are gaining increasing interest as natural and biodegradable alternatives to fossil-derived polymers for both structural and functional applications. However, simultaneously achieving their exceptional mechanical performance and desired functionality is challenging and requires complex processing. Here, we reported a one-step approach using a tension-assisted twisting (TAT) technique for MF fabrication from bacterial cellulose (BC). The TAT stretches and aligns BC nanofibers pre-arranged in hydrogel tubes to form MFs with compactly assembled structures and enhanced hydrogen bonding among neighboring nanofibers. The as-prepared BC MFs exhibited a very high tensile strength of 1 057 MPa and exceptional lifting capacity (over 340 000 when normalized by their own weight). Moreover, due to the volume expansion of BC nanofibers upon water exposure, BC MFs quickly harvested energy from environmental moisture to untwist the bundled networks, thus generating a torsional spinning with a peak rotation speed of 884 r/(min·m). The demonstrated rapid and intense actuation response makes the MFs ideal candidates for diverse humidity-response-based applications beyond advanced actuators, remote rain indicators, intelligent switches, and smart curtains.展开更多
Fibrous nanofluidic materials are ideal building blocks for implantable electrode,biomimetic actuator,wearable electronics due to their favorable features of intrinsic flexibility and unidirectional ion transport.Howe...Fibrous nanofluidic materials are ideal building blocks for implantable electrode,biomimetic actuator,wearable electronics due to their favorable features of intrinsic flexibility and unidirectional ion transport.However,the large-scale preparation of fibrous nanofluidic materials with desirable mechanical strength and good environment adaptability for practical use remains challenging.Herein,by fully taking advantage of the attractive mechanical,structural,chemical features of boron nitride(BN)nanosheet and nanofibrillated cellulose(NFC),a scalable and cost-effective three-dimensional(3D)printed macrofiber featuring abundant vertically aligned nanofluidic channels is demonstrated to exhibit a good combination of high tensile strength of 100 MPa,thermal stability of up to 230℃,ionic conductivity of 1.8×10^(−4)S/cm at low salt concentrations(<10^(−3)M).In addition,the versatile surface chemistry of cellulose allows us to stabilize the macrofiber at the molecular level via a facile postcross-linking method,which eventually enables the stable operation of the modified macrofiber in various extreme environments such as strong acidic,strong alkaline,high temperature.We believe this work implies a promising guideline for designing and manufacturing fibrous nanodevices towards extreme environment operations.展开更多
基金financially supported by BRICS STI Framework Programme 3rd call 2019the National Key Research and Development Program of China(Grant No.2018YFE0123700)+3 种基金the National Natural Science Foundation of China(Grant Nos.51973076 and 52073031)State Key Laboratory of New Textile Materials and Advanced Processing Technologies(Grant No.FZ2021005)the Fundamental Research Funds for the Central Universities(Grant Nos.2020kfyXJJS035,WUT2018IVB006,and Z191100001119047)。
文摘Electronic fibers used to fabricate wearable triboelectric nanogenerator(TENG) for harvesting human mechanical energy have been extensively explored. However, little attention is paid to their mutual advantages of environmental friendliness, mechanical properties, and stability. Here, we report a super-strong, biodegradable, and washable cellulose-based conductive macrofibers, which is prepared by wet-stretching and wet-twisting bacterial cellulose hydrogel incorporated with carbon nanotubes and polypyrrole. The cellulose-based conductive macrofibers possess high tensile strength of 449 MPa(able to lift 2 kg weights), good electrical conductivity(~ 5.32 S cm^(-1)), and excellent stability(Tensile strength and conductivity only decrease by 6.7% and 8.1% after immersing in water for 1 day). The degradation experiment demonstrates macrofibers can be degraded within 108 h in the cellulase solution. The designed fabric-based TENG from the cellulose-base conductive macrofibers shows a maximum open-circuit voltage of 170 V, short-circuit current of 0.8 μA, and output power at 352 μW, which is capable of powering the commercial electronics by charging the capacitors. More importantly, the fabric-based TENGs can be attached to the human body and work as self-powered sensors to effectively monitor human motions. This study suggests the potential of biodegradable, super-strong, and washable conductive cellulose-based fiber for designing eco-friendly fabric-based TENG for energy harvesting and biomechanical monitoring.
基金supported by the Hubei University of Science and Technology Doctoral Start-up Fund Project(Grant No.BK202306)the Innovation Team of Hubei University of Science and Technology,China(Grant No.2023T10)+3 种基金the National Natural Science Foundation of China(Grant No.2373235)horizontal cooperation projects between schools and enterprises(Grant No.2025HX032)Xianning City Natural Science Foundation(Grant No.2023ZRKX084)the Hubei Provincial Natural Science Foundation(Grant No.2023AFB453)。
文摘The rapid proliferation of wearable electronics has sparked significant research interest in fabric-based electromechanical sensors for continuous human motion tracking,human-machine interaction,and precision rehabilitation.However,the development of environmentally friendly and durable functional fibers or textiles with superior flexibility for fabric-based electromechanical sensors is challenging.In this study,we developed soft and biodegradable magnetic macrofibers using a stretching-twisting method applied to glycerol-plasticized bacterial cellulose(BC)strips embedded with CoFe_(2)O_(4)magnetic nanoparticles.The resulting magnetic macrofibers demonstrated superior mechanical properties,possessing a tensile strength of 33 MPa with a breaking strain of 3.5%while maintaining sufficient structural integrity to sustain a 2 kg load-bearing capacity.Additionally,the macrofibers were fully biodegradable by cellulase within 15 d,leaving only CoFe_(2)O_(4)nanoparticles that could be adsorbed and recovered by magnets.Furthermore,the fabric-based magnetoelectric sensor constructed by integrating a coil and the magnetic fabric woven by macrofibers demonstrated exceptional electromechanical coupling efficiency across an extended operational range(0.5-10 cm coil-to-textile distance).The superior distance sensitivity,stability,and durability of this sensor enabled real-time monitoring of human motion patterns under dynamic conditions.Therefore,BC-based magnetic macrofibers provide a promising strategy for developing eco-friendly and durable electromechanical sensors for sports training and rehabilitation monitoring.
基金support from the Zhejiang Provincial Natural Science Foundation of China(No.LR23C160001)the National Key Research and Development Program of China(No.2021YFD2100504).
文摘Cellulose macrofibers (MFs) are gaining increasing interest as natural and biodegradable alternatives to fossil-derived polymers for both structural and functional applications. However, simultaneously achieving their exceptional mechanical performance and desired functionality is challenging and requires complex processing. Here, we reported a one-step approach using a tension-assisted twisting (TAT) technique for MF fabrication from bacterial cellulose (BC). The TAT stretches and aligns BC nanofibers pre-arranged in hydrogel tubes to form MFs with compactly assembled structures and enhanced hydrogen bonding among neighboring nanofibers. The as-prepared BC MFs exhibited a very high tensile strength of 1 057 MPa and exceptional lifting capacity (over 340 000 when normalized by their own weight). Moreover, due to the volume expansion of BC nanofibers upon water exposure, BC MFs quickly harvested energy from environmental moisture to untwist the bundled networks, thus generating a torsional spinning with a peak rotation speed of 884 r/(min·m). The demonstrated rapid and intense actuation response makes the MFs ideal candidates for diverse humidity-response-based applications beyond advanced actuators, remote rain indicators, intelligent switches, and smart curtains.
文摘Fibrous nanofluidic materials are ideal building blocks for implantable electrode,biomimetic actuator,wearable electronics due to their favorable features of intrinsic flexibility and unidirectional ion transport.However,the large-scale preparation of fibrous nanofluidic materials with desirable mechanical strength and good environment adaptability for practical use remains challenging.Herein,by fully taking advantage of the attractive mechanical,structural,chemical features of boron nitride(BN)nanosheet and nanofibrillated cellulose(NFC),a scalable and cost-effective three-dimensional(3D)printed macrofiber featuring abundant vertically aligned nanofluidic channels is demonstrated to exhibit a good combination of high tensile strength of 100 MPa,thermal stability of up to 230℃,ionic conductivity of 1.8×10^(−4)S/cm at low salt concentrations(<10^(−3)M).In addition,the versatile surface chemistry of cellulose allows us to stabilize the macrofiber at the molecular level via a facile postcross-linking method,which eventually enables the stable operation of the modified macrofiber in various extreme environments such as strong acidic,strong alkaline,high temperature.We believe this work implies a promising guideline for designing and manufacturing fibrous nanodevices towards extreme environment operations.
