Flexible strain sensors have become a key component of intelligent wearable electronics.However,the fabrication of strain sensors with wide workable strain ranges and high sensitivity remains a great challenge.Additio...Flexible strain sensors have become a key component of intelligent wearable electronics.However,the fabrication of strain sensors with wide workable strain ranges and high sensitivity remains a great challenge.Additionally,the rapid development of polymer composites based strain sensors has produced a large amount of e-waste.Therefore,the development of strain sensors with wide strain sensing ranges and high sensitivity based on degradable materials is necessary.In this work,a silicone blocked polyurethane(Si-BPU)with high stretchability and degradability was synthesized and composited with carbon nanotubes(CNTs)to fabricate fibrous strain sensors.The synthesized 0.5%Si-BPU exhibited good biodegradability with a weight loss of 16.47%in 42 days.The Si-BPU/12CNTs fiber based strain sensor achieved a sensing range of 0%–353.3%strain,gauge factor(GF)of 206.3 at 250%strain and of 4,513.2 at 353.3%strain,reliable stability under 10,000 repeated stretching–releasing cycles.Moreover,the Si-BPU/12CNTs strain sensor showed rapid response time(<163 ms)and was capable of monitoring various human body movements(elbow bending,finger bending,breath,swallow).In consequence,this work provides a new and effective strategy for the development of sustainable wearable electronic devices.展开更多
Electrospun nanofibers have been considered as relatively ideal material system for the design and construction of surgical wound dressings in the past few decades.Although there are lots of other biopolymers employed...Electrospun nanofibers have been considered as relatively ideal material system for the design and construction of surgical wound dressings in the past few decades.Although there are lots of other biopolymers employed for electrospinning,chitosan is one of the most important biopolymers for the fabrication of electrospun nanofibers,due to its nontoxic,antibacterial,biocompatible as well as biodegradable properties.Electrospun chitosan nanofibers with random or aligned fiber structure can further be cross-linked by physical,chemical and ionic crosslinking methods.The as-crosslinked electrospun chitosan nanofibrous membranes possess enhanced wet stability,improved mechanical property and good biocompatibility,which are necessary for wound healing application.The present work reviews the recent studies on the design and development of electrospun chitosan nanofibers and their applications for wound healing,such as antibacterial materials,hemostatic dressings,angiogenesis and immune regulation.展开更多
基金the National Natural Science Foundation of China(Nos.51703108 and 52003130)the Postdoctoral Science Foundation of China(No.2019M652318)Taishan Scholar Foundation of Shandong,China(No.tsqn201909100)for financial support.
文摘Flexible strain sensors have become a key component of intelligent wearable electronics.However,the fabrication of strain sensors with wide workable strain ranges and high sensitivity remains a great challenge.Additionally,the rapid development of polymer composites based strain sensors has produced a large amount of e-waste.Therefore,the development of strain sensors with wide strain sensing ranges and high sensitivity based on degradable materials is necessary.In this work,a silicone blocked polyurethane(Si-BPU)with high stretchability and degradability was synthesized and composited with carbon nanotubes(CNTs)to fabricate fibrous strain sensors.The synthesized 0.5%Si-BPU exhibited good biodegradability with a weight loss of 16.47%in 42 days.The Si-BPU/12CNTs fiber based strain sensor achieved a sensing range of 0%–353.3%strain,gauge factor(GF)of 206.3 at 250%strain and of 4,513.2 at 353.3%strain,reliable stability under 10,000 repeated stretching–releasing cycles.Moreover,the Si-BPU/12CNTs strain sensor showed rapid response time(<163 ms)and was capable of monitoring various human body movements(elbow bending,finger bending,breath,swallow).In consequence,this work provides a new and effective strategy for the development of sustainable wearable electronic devices.
基金the financial supports from the China Postdoctoral Fund(2019M662299).
文摘Electrospun nanofibers have been considered as relatively ideal material system for the design and construction of surgical wound dressings in the past few decades.Although there are lots of other biopolymers employed for electrospinning,chitosan is one of the most important biopolymers for the fabrication of electrospun nanofibers,due to its nontoxic,antibacterial,biocompatible as well as biodegradable properties.Electrospun chitosan nanofibers with random or aligned fiber structure can further be cross-linked by physical,chemical and ionic crosslinking methods.The as-crosslinked electrospun chitosan nanofibrous membranes possess enhanced wet stability,improved mechanical property and good biocompatibility,which are necessary for wound healing application.The present work reviews the recent studies on the design and development of electrospun chitosan nanofibers and their applications for wound healing,such as antibacterial materials,hemostatic dressings,angiogenesis and immune regulation.
