Stretchable thermoelectrics have recently attracted widespread attention in the field of self-powered wearable electronics due to their unique capability of harvesting body heat.However,it remains challenging to devel...Stretchable thermoelectrics have recently attracted widespread attention in the field of self-powered wearable electronics due to their unique capability of harvesting body heat.However,it remains challenging to develop thermoelectric materials with excellent stretchability,durable thermoelectric properties,wearable comfort,and multifunctional sensing properties simultaneously.Herein,an advanced preparation strategy combining electrospinning and spraying technology is proposed to prepare carbon nanotube(CNT)/polyvinyl pyrrolidone(PVP)/polyurethane(PU)composite thermoelectric fabrics that have high air permeability and stretchability(~250%)close to those of pure PU nanofiber fabrics.Furthermore,PVP can not only improve the dispersion of CNTs but also act as interfacial binders between the CNT and the elastic PU skeleton.Consequently,both the electrical conductivity and the Seebeck coefficient remain unchanged even after bending 1000 times.In addition,self-powered sensors for the mutual conversion of finger temperature and language and detection of the movement of joints to optimize an athlete's movement state were successfully fabricated.This study paves the way for stretchable thermoelectric fabrics with fascinating applications in smart wearable fields such as power generation,health monitoring,and human–computer interaction.展开更多
Solar-driven interfacial desalination has been considered a promising and green technology for relieving worldwide water shortage because of its zero carbon emission.However,salt accumulation during evaporation result...Solar-driven interfacial desalination has been considered a promising and green technology for relieving worldwide water shortage because of its zero carbon emission.However,salt accumulation during evaporation results in a significant reduction in solar evaporation performance and sustained service life.High-performance and long-term salt-rejecting solar evaporators are urgently desirable.Inspired by the rapid water transfer driven by leaf transpiration and the capillary pressure in woody plants,we developed electrospun polyacrylonitrile@carbon nanotubes nanofiber/cotton core-spun yarn(PCCS yarn)based solar evaporator enabled by the multi-branch microchannels and sub-microchannels for ultra-efficient and durable high-salinity brine desalination.The optimal PCCS yarn-based solar evaporator exhibits a record-high evaporation rate of 3.46 kg m^(-2)h^(-1)under one sun illumination among 2D evaporators.Meanwhile,an excellent and stable brine desalination rate of∼2.75 kg m^(-2)h^(-1)for 100 h continuous solar irradiation is achieved even in 20wt%NaCl solution.The above results are attributed to the massive micro evaporation surfaces formed between nanofibers,rapid water replenishment in the radius direction,and orientational fast water transport by Laplace pressure along and across the PCCS yarn.In addition,the continuous preparation of the core-spun yarn by the conjugated electrospinning technology and the complete fabric production process in the textile industry make it possible for the practical application of the PCCS yarn-based solar evaporator.This work promotes the development of high-performance,long-term and scalable solar desalination devices.展开更多
Nanofiber core-spun yarn(NCSY)combines the advantages of traditional fibers and nanofibers to be widely used in smart wearable textiles,biomedical textiles,and functional textiles.Here,for the first time,the forming p...Nanofiber core-spun yarn(NCSY)combines the advantages of traditional fibers and nanofibers to be widely used in smart wearable textiles,biomedical textiles,and functional textiles.Here,for the first time,the forming process of NCSY and its shape regulation mechanism were explored via finite element analysis and response surface analysis method to obtain mathematical model for predicting the various forms of yarn.As proof-of-concept applications,shape-controllable nanofiber core-spun yarns were prepared for thermal–moisture management and solar steam generation,respectively.The as-obtained shape-controllable PAN nanofiber/cotton composite yarns could achieve an interval control of average water transfer velocity in the horizontal(0.17–0.24 cm min^(-1))and vertical(0.24–0.33 cm min^(-1))directions within 30 min due to the arrangement of PAN nanofibers causes microchannels and hydrophilicity,matching the sweat secretion of human bodies under dynamic or static conditions and realizing the purpose of thermal and moisture comfort.Furthermore,PAN nanofiber wrapped CNTs/cotton composite yarn-based(PAN@CNTs-NCSY)evaporator was designed,which shows a fast water evaporation rate of 1.40 kg m^(-2)h^(-1),exceeding in most fabric-based evaporators reported to date.These findings have guiding significance for preparing rich style NCSY according to demand and designing functional and intelligent textiles via adjusting the type of core and shell fibers.展开更多
基金Fundamental Research Funds for the Central Universities,Grant/Award Number:2232020A-08National Natural Science Foundation of China,Grant/Award Numbers:51973027,52003044。
文摘Stretchable thermoelectrics have recently attracted widespread attention in the field of self-powered wearable electronics due to their unique capability of harvesting body heat.However,it remains challenging to develop thermoelectric materials with excellent stretchability,durable thermoelectric properties,wearable comfort,and multifunctional sensing properties simultaneously.Herein,an advanced preparation strategy combining electrospinning and spraying technology is proposed to prepare carbon nanotube(CNT)/polyvinyl pyrrolidone(PVP)/polyurethane(PU)composite thermoelectric fabrics that have high air permeability and stretchability(~250%)close to those of pure PU nanofiber fabrics.Furthermore,PVP can not only improve the dispersion of CNTs but also act as interfacial binders between the CNT and the elastic PU skeleton.Consequently,both the electrical conductivity and the Seebeck coefficient remain unchanged even after bending 1000 times.In addition,self-powered sensors for the mutual conversion of finger temperature and language and detection of the movement of joints to optimize an athlete's movement state were successfully fabricated.This study paves the way for stretchable thermoelectric fabrics with fascinating applications in smart wearable fields such as power generation,health monitoring,and human–computer interaction.
基金supported by the National Natural Science Foundation of China(51973027,52003044,52373069,52373032)the Fundamental Research Funds for the Central Universities(2232020A-08)+5 种基金International Cooperation Fund of Science and Technology Commission of Shanghai Municipality(21130750100)Major Scientific and Technological Innovation Projects of Shandong Province(2021CXGC011004)supported by the Innovation Program of Shanghai Municipal Education Commission(2019-01-07-0003-E00023)to Prof.Xiaohong QinYoung Elite Scientists Sponsorship Program by CAST,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials(KF2216)DHU Distinguished Young Professor Program to Profthe Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University(CUSF-DH-D-2022039)to Mantang He.
文摘Solar-driven interfacial desalination has been considered a promising and green technology for relieving worldwide water shortage because of its zero carbon emission.However,salt accumulation during evaporation results in a significant reduction in solar evaporation performance and sustained service life.High-performance and long-term salt-rejecting solar evaporators are urgently desirable.Inspired by the rapid water transfer driven by leaf transpiration and the capillary pressure in woody plants,we developed electrospun polyacrylonitrile@carbon nanotubes nanofiber/cotton core-spun yarn(PCCS yarn)based solar evaporator enabled by the multi-branch microchannels and sub-microchannels for ultra-efficient and durable high-salinity brine desalination.The optimal PCCS yarn-based solar evaporator exhibits a record-high evaporation rate of 3.46 kg m^(-2)h^(-1)under one sun illumination among 2D evaporators.Meanwhile,an excellent and stable brine desalination rate of∼2.75 kg m^(-2)h^(-1)for 100 h continuous solar irradiation is achieved even in 20wt%NaCl solution.The above results are attributed to the massive micro evaporation surfaces formed between nanofibers,rapid water replenishment in the radius direction,and orientational fast water transport by Laplace pressure along and across the PCCS yarn.In addition,the continuous preparation of the core-spun yarn by the conjugated electrospinning technology and the complete fabric production process in the textile industry make it possible for the practical application of the PCCS yarn-based solar evaporator.This work promotes the development of high-performance,long-term and scalable solar desalination devices.
基金supported by the Grants(52373069,52373032,51973027,and 52003044)from the National Natural Science Foundation of China,the National Key Research and Development Program of China(2023YFC3011701)the Fundamental Research Funds for the Central Universities(2232023A-05)+3 种基金International Cooperation Fund of Science and Technology Commission of Shanghai Municipality(21130750100)the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University(CUSF-DH-D2022039)Major Scientific and Technological Innovation Projects of Shandong Province(2021CXGC011004,2023CXGC010610)supported by the Chang Jiang Scholars Program and the Innovation Program of Shanghai Municipal Education Commission(2019-01-07-00-03-E00023)to Prof.Xiaohong Qin.
文摘Nanofiber core-spun yarn(NCSY)combines the advantages of traditional fibers and nanofibers to be widely used in smart wearable textiles,biomedical textiles,and functional textiles.Here,for the first time,the forming process of NCSY and its shape regulation mechanism were explored via finite element analysis and response surface analysis method to obtain mathematical model for predicting the various forms of yarn.As proof-of-concept applications,shape-controllable nanofiber core-spun yarns were prepared for thermal–moisture management and solar steam generation,respectively.The as-obtained shape-controllable PAN nanofiber/cotton composite yarns could achieve an interval control of average water transfer velocity in the horizontal(0.17–0.24 cm min^(-1))and vertical(0.24–0.33 cm min^(-1))directions within 30 min due to the arrangement of PAN nanofibers causes microchannels and hydrophilicity,matching the sweat secretion of human bodies under dynamic or static conditions and realizing the purpose of thermal and moisture comfort.Furthermore,PAN nanofiber wrapped CNTs/cotton composite yarn-based(PAN@CNTs-NCSY)evaporator was designed,which shows a fast water evaporation rate of 1.40 kg m^(-2)h^(-1),exceeding in most fabric-based evaporators reported to date.These findings have guiding significance for preparing rich style NCSY according to demand and designing functional and intelligent textiles via adjusting the type of core and shell fibers.
