To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging nowadays.Herein,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fl...To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging nowadays.Herein,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fluorescence,and shape simultaneously is reported The BP4VA/PAS hydrogel is fabricated by incorporating styryl anthracene derivative(BP4VA)into copolymer networks(PAS)of acrylamide and sodium 4-styrene sulfonate.Under acid conditions,the protonation of BP4VA generates a rapid change with high color contrast from yellow to red and a fluorescence switch between bright green and weak red emission.At the same time,the electrostatic interactions between 2H-BP4VA^(2+)and sulfonate anions suspended on PAS trigger BP4VA/PAS hydrogels to shrink.Upon alkaline treatment,the 2H-BP4VA^(2+)/PAS hydrogel deproto nates and recovers to its original color,fluorescence,and shape.Furthermore,utilizing rapid and remarkable pH-responsive properties o BP4VA/PAS hydrogels,we successfully demonstrated its applications in biomimicry,camouflage,and multistage information encryption.Collec tively,this work provided an elegant strategy to develop intelligent hydrogels in applications of biomimetic smart materials and information en cryption.展开更多
Moderate ultraviolet(UV)radiation from sunlight is essential for human health,but overexposure to UV rays can cause serious adverse effects.It is important to detect UV radiation from sunlight in time to prevent damag...Moderate ultraviolet(UV)radiation from sunlight is essential for human health,but overexposure to UV rays can cause serious adverse effects.It is important to detect UV radiation from sunlight in time to prevent damage from excessive exposure.Here,a ready-to-use,easy-to-interpret,inexpensive,reusable,and wearable all-in-one UV monitoring and shielding sensor SP-TPE@PU textile has been developed.The SP-TPE@PU textiles are constructed by photochromic molecule SP-TPE and commercial polymer polyurethane(PU)through electrospinning.The SP-TPE molecule acts as the sensor component,and PU contributes to high flexibility.The SP-TPE@PU textiles show remarkable durability(against repeated twisting,curling,bending deformations,and water immersion)and good permeability,making them durable and breathable wearable materials.When exposed to sunlight,the SP-TPE@PU textiles rapidly exhibit significant color changes due to the efficient isomerization of SP-TPE,serving as an early warning and monitoring of UV radiation.In addition,the SP-TPE@PU textiles can revert to the initial state with visible light irradiation for reuse.Furthermore,the SP-TPE@PU textiles possess excellent UV shielding ability,contributing to human body protection.Simple and easy operation,significant and reversible color changes,good breathability and mechanical properties make SP-TPE@PU textiles reusable and wearable all-in-one UV monitoring and shielding sensors.展开更多
Aims In desert ecosystems,water is a restricting factor for plant growth and vegetation dynamics.The relatively stable water source from deep soil profile or groundwater is important for plant survival during drought....Aims In desert ecosystems,water is a restricting factor for plant growth and vegetation dynamics.The relatively stable water source from deep soil profile or groundwater is important for plant survival during drought.Understanding water use strategy of endangered species,in desert ecosystem is essential for their conservation and restoration such as Ammopiptanthus mongolicus on the Mongolian Plateau.Methods The stable isotope method ofδD andδ^(18)O was used to examine the main water sources of A.mongolicus and two companion shrubs,e.g.Artemisia ordosica and Artemisia xerophytica.The contribution of different water sources to each species was calculated by IsoSource model.Leafδ13C was used to compare long-term water use efficiency of three shrubs.Soil moisture and root distribution of three shrubs was measured to explain plant water use strategy.Important Findings The results showed that A.mongolicus relied on groundwater and 150–200 cm deep soil water,with the former contributing to almost half of its total water source.Artemisia ordosica mainly used 150–200 cm deep soil water,but also used shallow soil water within 100 cm in summer and autumn.Artemisia xerophytica mainly used 150–200 cm deep soil water and groundwater,with the latter contributing to about 30%–60%of its total water source.The three shrubs had dimorphic or deep root systems,which are in accord with their water sources.The WUE in the evergreen shrub A.mongolicus was higher than in two deciduous Artemisia shrubs,which may be an adaptive advantage in desert ecosystem.Therefore,groundwater is an important water source for the endangered shrub A.mongolicus in a drought year on Mongolian Plateau.Ammopiptanthus mongolicus and two Artemisia shrubs competed for deep soil water and groundwater.展开更多
Nature has been inspiring material researchers to fabricate biomimetic functional devices for various applications, and shape-memory polymer materials(SMPMs) have received tremendous attention since the promising inte...Nature has been inspiring material researchers to fabricate biomimetic functional devices for various applications, and shape-memory polymer materials(SMPMs) have received tremendous attention since the promising intelligent materials possess more advantages over others for the fabrication of biomimetic functional devices. As is well-known, SMPMs can be stimulated by heat, electricity, magnetism, pH, solvent and light. From the viewpoint of practical applications, ultraviolet(UV)-visible(Vis)-near infrared(NIR) light-responsive SMPMs are undoubtedly more advantageous. However, up to now, UV-Vis-NIR light-deformable SMPMs by combining photothermal and photochemical effects are still rarely reported. Here we designed a UV-Vis-NIR light-deformable SMP composite film via incorporating a liquid crystal(LC) mixture and graphene oxide(GO) into a shape-memory polyurethane matrix. The elongated composite films exhibited interesting photomechanical bending deformations with different light-triggered mechanisms,(1) photochemically induced LC phase transition upon UV exposure,(2) photochemically and photothermally induced LC phase transition upon visible-light irradiation,(3) photothermally triggered LC phase transition and partial stress relaxation upon low-intensity NIR exposure. All the deformed objects could recover to their original shapes by high-intensity NIR irradiation.Moreover, the biomimetic circadian rhythms of acacia leaves and the biomimetic bending/spreading of fingers were successfully achieved, which could blaze a way in the field of biomimetic functional devices due to the excellent light-deformable and shape-memory properties of the SMP composite films.展开更多
Here we report a novel polymeric nanogel with stable loading cargo and near-infrared(NIR) controlled release properties.The nanogels are crosslinked by quaternization reactions of biocompatible poly(β-amino esters) a...Here we report a novel polymeric nanogel with stable loading cargo and near-infrared(NIR) controlled release properties.The nanogels are crosslinked by quaternization reactions of biocompatible poly(β-amino esters) and diselenide-bonded crosslinker(DSe DCl) in microemulsions.The hydrophobic cavities of the nanogels have the property of stably encapsulating the hydrophobic vip molecules,resulted from the crosslinked network structure.Due to the redox responsiveness of the diselenide bonds on the DSe DCl crosslinker,the nanogels can respond to oxidant H_(2)O_(2) causing the disintegration of the crosslinked network structure,thus the encapsulated vip cargo molecules will be released.It is noted that,upon loading the photosensitizer IR780,the nanogels can generate reactive oxygen species(ROS) under NIR irradiation to release the cargo.The advantages of encapsulated cargo stability enhanced by chemical cross-linking and remote stimulation response performance via NIR offer great potential of nanogels for applications of cargo controlled release.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51373025 and 22005021)Beijing Natural Science Foundation(No.2242044)+2 种基金the Fundamental Research Funds for the Central Universities(No.FRF-TP-22-003A1)China Postdoctoral Science Foundation(No.2023M730311)the Program for New Century Excellent Talents in University(No.NCET-11-0582)。
文摘To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging nowadays.Herein,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fluorescence,and shape simultaneously is reported The BP4VA/PAS hydrogel is fabricated by incorporating styryl anthracene derivative(BP4VA)into copolymer networks(PAS)of acrylamide and sodium 4-styrene sulfonate.Under acid conditions,the protonation of BP4VA generates a rapid change with high color contrast from yellow to red and a fluorescence switch between bright green and weak red emission.At the same time,the electrostatic interactions between 2H-BP4VA^(2+)and sulfonate anions suspended on PAS trigger BP4VA/PAS hydrogels to shrink.Upon alkaline treatment,the 2H-BP4VA^(2+)/PAS hydrogel deproto nates and recovers to its original color,fluorescence,and shape.Furthermore,utilizing rapid and remarkable pH-responsive properties o BP4VA/PAS hydrogels,we successfully demonstrated its applications in biomimicry,camouflage,and multistage information encryption.Collec tively,this work provided an elegant strategy to develop intelligent hydrogels in applications of biomimetic smart materials and information en cryption.
基金This work was financially supported by Beijing Natural Science Foundation(No.2242044)the National Natural Science Foundation of China(Nos.52103049,22005021 and 51373025)+2 种基金the Fundamental Research Funds for the Central Universities(No.FRF-TP-22-003A1)China Postdoctoral Science Foundation(No.2023M730311)the Program for New Century Excellent Talents in University(No.NCET-11-0582).
文摘Moderate ultraviolet(UV)radiation from sunlight is essential for human health,but overexposure to UV rays can cause serious adverse effects.It is important to detect UV radiation from sunlight in time to prevent damage from excessive exposure.Here,a ready-to-use,easy-to-interpret,inexpensive,reusable,and wearable all-in-one UV monitoring and shielding sensor SP-TPE@PU textile has been developed.The SP-TPE@PU textiles are constructed by photochromic molecule SP-TPE and commercial polymer polyurethane(PU)through electrospinning.The SP-TPE molecule acts as the sensor component,and PU contributes to high flexibility.The SP-TPE@PU textiles show remarkable durability(against repeated twisting,curling,bending deformations,and water immersion)and good permeability,making them durable and breathable wearable materials.When exposed to sunlight,the SP-TPE@PU textiles rapidly exhibit significant color changes due to the efficient isomerization of SP-TPE,serving as an early warning and monitoring of UV radiation.In addition,the SP-TPE@PU textiles can revert to the initial state with visible light irradiation for reuse.Furthermore,the SP-TPE@PU textiles possess excellent UV shielding ability,contributing to human body protection.Simple and easy operation,significant and reversible color changes,good breathability and mechanical properties make SP-TPE@PU textiles reusable and wearable all-in-one UV monitoring and shielding sensors.
基金supported by the Fundamental Research Funds for the Central Non-profit Research Institute of Chinese Academy of Forestry(CAFZC2017M006).
文摘Aims In desert ecosystems,water is a restricting factor for plant growth and vegetation dynamics.The relatively stable water source from deep soil profile or groundwater is important for plant survival during drought.Understanding water use strategy of endangered species,in desert ecosystem is essential for their conservation and restoration such as Ammopiptanthus mongolicus on the Mongolian Plateau.Methods The stable isotope method ofδD andδ^(18)O was used to examine the main water sources of A.mongolicus and two companion shrubs,e.g.Artemisia ordosica and Artemisia xerophytica.The contribution of different water sources to each species was calculated by IsoSource model.Leafδ13C was used to compare long-term water use efficiency of three shrubs.Soil moisture and root distribution of three shrubs was measured to explain plant water use strategy.Important Findings The results showed that A.mongolicus relied on groundwater and 150–200 cm deep soil water,with the former contributing to almost half of its total water source.Artemisia ordosica mainly used 150–200 cm deep soil water,but also used shallow soil water within 100 cm in summer and autumn.Artemisia xerophytica mainly used 150–200 cm deep soil water and groundwater,with the latter contributing to about 30%–60%of its total water source.The three shrubs had dimorphic or deep root systems,which are in accord with their water sources.The WUE in the evergreen shrub A.mongolicus was higher than in two deciduous Artemisia shrubs,which may be an adaptive advantage in desert ecosystem.Therefore,groundwater is an important water source for the endangered shrub A.mongolicus in a drought year on Mongolian Plateau.Ammopiptanthus mongolicus and two Artemisia shrubs competed for deep soil water and groundwater.
基金financially supported by the National Natural Science Foundation of China(Nos.51373025,51773002 and 51921002)。
文摘Nature has been inspiring material researchers to fabricate biomimetic functional devices for various applications, and shape-memory polymer materials(SMPMs) have received tremendous attention since the promising intelligent materials possess more advantages over others for the fabrication of biomimetic functional devices. As is well-known, SMPMs can be stimulated by heat, electricity, magnetism, pH, solvent and light. From the viewpoint of practical applications, ultraviolet(UV)-visible(Vis)-near infrared(NIR) light-responsive SMPMs are undoubtedly more advantageous. However, up to now, UV-Vis-NIR light-deformable SMPMs by combining photothermal and photochemical effects are still rarely reported. Here we designed a UV-Vis-NIR light-deformable SMP composite film via incorporating a liquid crystal(LC) mixture and graphene oxide(GO) into a shape-memory polyurethane matrix. The elongated composite films exhibited interesting photomechanical bending deformations with different light-triggered mechanisms,(1) photochemically induced LC phase transition upon UV exposure,(2) photochemically and photothermally induced LC phase transition upon visible-light irradiation,(3) photothermally triggered LC phase transition and partial stress relaxation upon low-intensity NIR exposure. All the deformed objects could recover to their original shapes by high-intensity NIR irradiation.Moreover, the biomimetic circadian rhythms of acacia leaves and the biomimetic bending/spreading of fingers were successfully achieved, which could blaze a way in the field of biomimetic functional devices due to the excellent light-deformable and shape-memory properties of the SMP composite films.
基金financially supported by the National Natural Science Foundation of China (No. 51373025)the Program for New Century Excellent Talents in University (No. NCET-110582)。
文摘Here we report a novel polymeric nanogel with stable loading cargo and near-infrared(NIR) controlled release properties.The nanogels are crosslinked by quaternization reactions of biocompatible poly(β-amino esters) and diselenide-bonded crosslinker(DSe DCl) in microemulsions.The hydrophobic cavities of the nanogels have the property of stably encapsulating the hydrophobic vip molecules,resulted from the crosslinked network structure.Due to the redox responsiveness of the diselenide bonds on the DSe DCl crosslinker,the nanogels can respond to oxidant H_(2)O_(2) causing the disintegration of the crosslinked network structure,thus the encapsulated vip cargo molecules will be released.It is noted that,upon loading the photosensitizer IR780,the nanogels can generate reactive oxygen species(ROS) under NIR irradiation to release the cargo.The advantages of encapsulated cargo stability enhanced by chemical cross-linking and remote stimulation response performance via NIR offer great potential of nanogels for applications of cargo controlled release.
