The coronavirus disease 2019(COVID-19)pandemic has caused a surge in demand for face masks,with the massive consumption of masks leading to an increase in resource-related and environmental con-cerns.In this work,we f...The coronavirus disease 2019(COVID-19)pandemic has caused a surge in demand for face masks,with the massive consumption of masks leading to an increase in resource-related and environmental con-cerns.In this work,we fabricated meltblown polypropylene(mb-PP)-based high-performance planar face masks and investigated the effects of six commonly used disinfection methods and various mask-wearing periods on the reusability of these masks.The results show that,after three cycles of treatment using hot water at 70℃ for 30 min,which is one of the most scalable,user-friendly methods for viral disinfection,the particle filtration efficiency(PFE)of the mask remained almost unchanged.After mask wearing for 24 h and subsequent disinfection using the same treatment procedures,the PFE decreased to 91.3%;the average number of bacterial and fungal colonies was assessed to be 9.2 and 51.6 colony-forming units per gram(CFU∙g^(-1)),respectively;and coliform and pyogenic bacteria were not detected.Both the PFE and the microbial indicators are well above the standard for reusable masks after disinfection.Schlieren pho-tography was then used to assess the capabilities of used and disinfected masks during use;it showed that the masks exhibit a high performance in suppressing the spread of breathed air.展开更多
Incorporation of photochromic compounds to the polymer through chemical bonding will result in an enhancement of photoactivity and stabilization of optical properties.Here,spiropyran(SP)was introduced into polyurethan...Incorporation of photochromic compounds to the polymer through chemical bonding will result in an enhancement of photoactivity and stabilization of optical properties.Here,spiropyran(SP)was introduced into polyurethane(PU)through semi-continuous emulsion copolymerization to get waterborne polyurethane dispersion(SPU).Studies on photochromic properties by UV-vis technique demonstrated the absorption intensity increased with the increasing of SP concentration and the colorless film turned to purple under UV irradiation.The kinetics for ring-opening and ring-closing reaction against SP were both first order,but the rate constants decreased with the increasing of SP concentration.The prepared SPU films showed reasonable photostability and photoreversibility according to the convenient test methods under UV-vis irradiation.Temperature dependence studies demonstrated that the photobleaching rate increased at higher temperatures with the same SP concentration.The chemical combination between SP and isocyanate(NCO)end group of polyurethane was confirmed through swelling experiments.Morphology studies were conducted by scanning electron microscope(SEM)micrographs and showed good compatibility between SP and PU.展开更多
Self-healable electronics with self-recoverable mechanical properties show a lot of potential in improving the reliability and durability of wearable electronic devices,but it is still challenging.Herein,a self-healin...Self-healable electronics with self-recoverable mechanical properties show a lot of potential in improving the reliability and durability of wearable electronic devices,but it is still challenging.Herein,a self-healing core-sheath thermoelectric(TE)fiber-based temperature sensor was continuously fabricated by coaxial wet-spinning strategy,whose core layer and sheath layer are,respectively,pure Ti_(3)C_(2)T_(x)MXene and self-healing silk sericin(SS)/oxide sodium alginate(OSA)composite.The prepared SS/OSA@MXene core-sheath TE fiber exhibits accurate temperature-sensing at 200-400℃based on a linear relationship between TE voltage and temperature difference.The core-sheath TE fiber that can be integrated into firefighting clothing and timely alert firefighters to evacuate from the fire before the protective clothing becomes damaged.When exposed to flames,SS/OSA@MXene can rapidly trigger a high-temperature warning voltage of 3.36 mV within 1.17 s and exhibit reversible high-temperature alarm performance.In addition,the fractured SS/OSA@MXene can restore up to 89.12%of its original strain limit at room temperature because of the robust yet reversible dynamic covalent bonds between SS and OSA.In this study,an ingenious strategy for developing a durable and wearable TE fiber-based self-powered temperature sensor was proposed.This strategy has promising application prospects in real-time temperature detection of firefighting clothing to ensure the safety of firefighters operating on a fire scene.展开更多
Long-emission carbon dots(CDs) is triggering immense enthusiasm on account of their intrinsic merits of high chemical stability and excellent optical properties.In this study,a facile and rapid approach was developed ...Long-emission carbon dots(CDs) is triggering immense enthusiasm on account of their intrinsic merits of high chemical stability and excellent optical properties.In this study,a facile and rapid approach was developed for the preparation of barium-doped carbon dots(Ba-CDs) with yellow fluo rescence emission and high quantum yields.Surface chemistry and the chemical architecture of the Ba-CDs was revealed under various spectroscopic methods.This work provides more insights into the effects of charge transfer caused by Ba heteroatoms,which is considered as the most challenging step in the investigation on luminescence mechanism.Remarkably,the prepared Ba-CDs were successfully applied as fluorescent probes in the detection of trace water in organic solvents(ethanol,isopropanol,acetone,tetrahydrofuran).Comparing with traditional fluorescent probes for water detection in organic solvents,Ba-CDs detection provides a more sensitive,much faster and more economical approach.展开更多
In recent years,countries worldwide have engaged actively in the research and development of green and sustainable materials in the face of the increasing depletion of petroleum resources,the need to reduce material w...In recent years,countries worldwide have engaged actively in the research and development of green and sustainable materials in the face of the increasing depletion of petroleum resources,the need to reduce material waste,and the environmental pollution caused by the various types of waste.In the tire industry,the key materials for the various components of tires are mostly dependent on petroleum resources.Development of green tires and green processing technologies using sustainable materials is an important development direction for the future of the tire industry,and many tire-manufacturing companies have proposed their visions for the development of eco-friendly tires.Rubber,cord fabric,and additives are the main materials used in tire manufacturing.This article summarizes the research status of the green materials that can meet the requirements of environmental friendliness and sustainability,replace traditional materials,and reduce petroleum resource consumption in existing tire production.These materials mainly include natural rubber or bio-based synthetic rubber,green renewable cord fabrics,and green processing additives.The prospects for the application of these new green materials in tire manufacturing are also discussed.展开更多
Using stretchable nanogenerators to obtain disordered mechanical energy from the environment is an ideal way to realize wearable power supply equipment and self-power electronic devices,and alleviate the energy crisis...Using stretchable nanogenerators to obtain disordered mechanical energy from the environment is an ideal way to realize wearable power supply equipment and self-power electronic devices,and alleviate the energy crisis.It is of great significance to integrate the stretchability into the nanogenerator,which can fit the complex shape of the target object better and is well suitable for wearable electronics.When applied to the human body,it can directly harvest human body mechanical energy to power wearable electronic devices and get rid of the trouble of charging.This paper systematically reviewed nanogenerators in stretchability,focusing on stretchable triboelectric nanogenerators,stretchable piezoelectric nanogenerators,and stretchable hybrid nanogenerators.Their physical mechanism,material selection,structure design,and output performance are discussed in detail.It is concluded that the fabrication methods of various devices can be broadly categorized into the two most important device types,namely fiber-like and planar.A detailed analysis of representative work and the latest progress in the past decade is performed.It is most important that excellent stretchability and high-power output are the key point to realize application value of stretchable nanogenerators.In addition,we discuss opportunities and challenges,as well as future development direction of stretchable nanogenerators.展开更多
基金supported by National Key Research and Development Program of China (2020YFC0844800)the Science and Technology Planning Project of Beijing (Z201100007520006)
文摘The coronavirus disease 2019(COVID-19)pandemic has caused a surge in demand for face masks,with the massive consumption of masks leading to an increase in resource-related and environmental con-cerns.In this work,we fabricated meltblown polypropylene(mb-PP)-based high-performance planar face masks and investigated the effects of six commonly used disinfection methods and various mask-wearing periods on the reusability of these masks.The results show that,after three cycles of treatment using hot water at 70℃ for 30 min,which is one of the most scalable,user-friendly methods for viral disinfection,the particle filtration efficiency(PFE)of the mask remained almost unchanged.After mask wearing for 24 h and subsequent disinfection using the same treatment procedures,the PFE decreased to 91.3%;the average number of bacterial and fungal colonies was assessed to be 9.2 and 51.6 colony-forming units per gram(CFU∙g^(-1)),respectively;and coliform and pyogenic bacteria were not detected.Both the PFE and the microbial indicators are well above the standard for reusable masks after disinfection.Schlieren pho-tography was then used to assess the capabilities of used and disinfected masks during use;it showed that the masks exhibit a high performance in suppressing the spread of breathed air.
基金Construction of High-Level Teachers of Beijing Institute of Fashion Technology,China(No.BIFT201808)。
文摘Incorporation of photochromic compounds to the polymer through chemical bonding will result in an enhancement of photoactivity and stabilization of optical properties.Here,spiropyran(SP)was introduced into polyurethane(PU)through semi-continuous emulsion copolymerization to get waterborne polyurethane dispersion(SPU).Studies on photochromic properties by UV-vis technique demonstrated the absorption intensity increased with the increasing of SP concentration and the colorless film turned to purple under UV irradiation.The kinetics for ring-opening and ring-closing reaction against SP were both first order,but the rate constants decreased with the increasing of SP concentration.The prepared SPU films showed reasonable photostability and photoreversibility according to the convenient test methods under UV-vis irradiation.Temperature dependence studies demonstrated that the photobleaching rate increased at higher temperatures with the same SP concentration.The chemical combination between SP and isocyanate(NCO)end group of polyurethane was confirmed through swelling experiments.Morphology studies were conducted by scanning electron microscope(SEM)micrographs and showed good compatibility between SP and PU.
基金the funding support from Guiding Project of Natural Science Foundation of Hubei Province(2022CFC072)Guiding Project of Scientific Research Plan of Education Department of Hubei Province(B2022081)Science and Technology Guidance Program of China National Textile and Apparel Council(2022002,2023004).
文摘Self-healable electronics with self-recoverable mechanical properties show a lot of potential in improving the reliability and durability of wearable electronic devices,but it is still challenging.Herein,a self-healing core-sheath thermoelectric(TE)fiber-based temperature sensor was continuously fabricated by coaxial wet-spinning strategy,whose core layer and sheath layer are,respectively,pure Ti_(3)C_(2)T_(x)MXene and self-healing silk sericin(SS)/oxide sodium alginate(OSA)composite.The prepared SS/OSA@MXene core-sheath TE fiber exhibits accurate temperature-sensing at 200-400℃based on a linear relationship between TE voltage and temperature difference.The core-sheath TE fiber that can be integrated into firefighting clothing and timely alert firefighters to evacuate from the fire before the protective clothing becomes damaged.When exposed to flames,SS/OSA@MXene can rapidly trigger a high-temperature warning voltage of 3.36 mV within 1.17 s and exhibit reversible high-temperature alarm performance.In addition,the fractured SS/OSA@MXene can restore up to 89.12%of its original strain limit at room temperature because of the robust yet reversible dynamic covalent bonds between SS and OSA.In this study,an ingenious strategy for developing a durable and wearable TE fiber-based self-powered temperature sensor was proposed.This strategy has promising application prospects in real-time temperature detection of firefighting clothing to ensure the safety of firefighters operating on a fire scene.
基金financially supported by the National Natural Science Foundation of China (NSFC,No.21805024)Science Foundation of China University of Petroleum (Nos. 2462019QNXZ02,2462018BJC004)+1 种基金the Scientifc and Technological Research Program of Chongqing Municipal Education Commission (No.KJ QN202001335)the Research Program ofYongchuan Science and Technology Commission (Ycstc,No.2018nb1402)。
文摘Long-emission carbon dots(CDs) is triggering immense enthusiasm on account of their intrinsic merits of high chemical stability and excellent optical properties.In this study,a facile and rapid approach was developed for the preparation of barium-doped carbon dots(Ba-CDs) with yellow fluo rescence emission and high quantum yields.Surface chemistry and the chemical architecture of the Ba-CDs was revealed under various spectroscopic methods.This work provides more insights into the effects of charge transfer caused by Ba heteroatoms,which is considered as the most challenging step in the investigation on luminescence mechanism.Remarkably,the prepared Ba-CDs were successfully applied as fluorescent probes in the detection of trace water in organic solvents(ethanol,isopropanol,acetone,tetrahydrofuran).Comparing with traditional fluorescent probes for water detection in organic solvents,Ba-CDs detection provides a more sensitive,much faster and more economical approach.
基金National Natural Science Foundation of China,the Basic Science Center Program,Grant/Award Number:51988102Beijing Nova Program,Grant/Award Number:20220484213Innovation Teambuilding Program of the Beijing Institute of Fashion Technology,Grant/Award Number:BIFTTD201904。
文摘In recent years,countries worldwide have engaged actively in the research and development of green and sustainable materials in the face of the increasing depletion of petroleum resources,the need to reduce material waste,and the environmental pollution caused by the various types of waste.In the tire industry,the key materials for the various components of tires are mostly dependent on petroleum resources.Development of green tires and green processing technologies using sustainable materials is an important development direction for the future of the tire industry,and many tire-manufacturing companies have proposed their visions for the development of eco-friendly tires.Rubber,cord fabric,and additives are the main materials used in tire manufacturing.This article summarizes the research status of the green materials that can meet the requirements of environmental friendliness and sustainability,replace traditional materials,and reduce petroleum resource consumption in existing tire production.These materials mainly include natural rubber or bio-based synthetic rubber,green renewable cord fabrics,and green processing additives.The prospects for the application of these new green materials in tire manufacturing are also discussed.
基金supported by the National Key Rsearch and Development Program of China(No.2021YFA1201604)the National Natural Science Foundation of China(No.52072041),the Beijing Natural Science Foundation(No.JQ21007)+1 种基金“Practical Training Program”Project of Cross-training High-level Talents in Beijing Universities(No.NHFZ20210022/018)the University of Chinese Academy of Sciences(No.Y8540XX2D2).
文摘Using stretchable nanogenerators to obtain disordered mechanical energy from the environment is an ideal way to realize wearable power supply equipment and self-power electronic devices,and alleviate the energy crisis.It is of great significance to integrate the stretchability into the nanogenerator,which can fit the complex shape of the target object better and is well suitable for wearable electronics.When applied to the human body,it can directly harvest human body mechanical energy to power wearable electronic devices and get rid of the trouble of charging.This paper systematically reviewed nanogenerators in stretchability,focusing on stretchable triboelectric nanogenerators,stretchable piezoelectric nanogenerators,and stretchable hybrid nanogenerators.Their physical mechanism,material selection,structure design,and output performance are discussed in detail.It is concluded that the fabrication methods of various devices can be broadly categorized into the two most important device types,namely fiber-like and planar.A detailed analysis of representative work and the latest progress in the past decade is performed.It is most important that excellent stretchability and high-power output are the key point to realize application value of stretchable nanogenerators.In addition,we discuss opportunities and challenges,as well as future development direction of stretchable nanogenerators.
