In this study,the hydrogel network was reinforced by covalent-like hydrogen bonding,and the strong binding ability of boron-nitrogen coordination served as the main driving force.Among them,acrylamide(AM)and 3-acrylam...In this study,the hydrogel network was reinforced by covalent-like hydrogen bonding,and the strong binding ability of boron-nitrogen coordination served as the main driving force.Among them,acrylamide(AM)and 3-acrylamidophenylboronic acid(AAPBA)were the main body,and the numerous hydroxyl groups in the trehalose(Treh)molecule and other polymer groups formed strong hydrogen bonding interactions to improve the mechanical properties of the PAM/PAAPBA/Treh(PAAT)hydrogel and ensured the simplicity of the synthesis process.The hydrogel possessed high strain at break(1239%),stress(64.7 kPa),low hysteresis(100%to 500%strain,corresponding to dissipation energy from 1.37 to 7.80 kJ/m^(3)),and outstanding cycling stability(retained more than 90%of maximum stress after 200 ten-sile cycles).By integrating carbon nanotubes(CNTs)into PAAT hydrogel(PAATC),the PAATC hydrogel with excellent strain response performance was successfully constructed.The PAATC conductive hydro-gel exhibited high sensitivity(gauge factor(GF)=10.58 and sensitivity(S)=0.304 kPa^(-1)),wide strain response range(0.5%-1000%),fast response time(450 ms),and short recovery time(350 ms),excellent fatigue resistance,and strain response stability.Furthermore,the PAATC-based triboelectric nanogener-ator(TENG)displayed outstanding energy harvesting performance,which shows its potential for appli-cation in self-powered electronic devices.展开更多
太阳能驱动水蒸发是利用太阳能进行海水脱盐和清洁水生产的实用方法,具有最低的碳排放.但该方法在弱光照的阴天或夜间蒸发速率较低.本文基于光热和电热加热的耦合效应,提出了一种可以根据光照条件调节表面温度和蒸发速率的织物基全天候...太阳能驱动水蒸发是利用太阳能进行海水脱盐和清洁水生产的实用方法,具有最低的碳排放.但该方法在弱光照的阴天或夜间蒸发速率较低.本文基于光热和电热加热的耦合效应,提出了一种可以根据光照条件调节表面温度和蒸发速率的织物基全天候可用光热-电热蒸发器(P/ET-SG).由于电热层与光热层均匀的热分布,该P/ET-SG在1 V电压和1个太阳光辐照下其表面温度及蒸发速率可达52℃和2.61 kg m^(-2) h^(-1).P/ET-SG所采用的单向流体结构设计使其在连续24小时的海水脱盐过程中具备极高的耐盐性,且能除去蒸发表面的盐颗粒.此外,在高浓度盐水和污水净化中,P/ET-SG展现了高的蒸发速率(2.58 kg m^(-2) h^(-1))和净化效率(>99.9%).本文为全天候可用的高效太阳能蒸发器的设计提供了新思路,并提供了高浓度盐水和污水高效净化的新策略.展开更多
基金the financial support from the National Natural Science Foundation of China (52002356)the China Postdoctoral Science Foundation (2020M672269)the National Key R&D program of China (2019YFA0706802)
文摘In this study,the hydrogel network was reinforced by covalent-like hydrogen bonding,and the strong binding ability of boron-nitrogen coordination served as the main driving force.Among them,acrylamide(AM)and 3-acrylamidophenylboronic acid(AAPBA)were the main body,and the numerous hydroxyl groups in the trehalose(Treh)molecule and other polymer groups formed strong hydrogen bonding interactions to improve the mechanical properties of the PAM/PAAPBA/Treh(PAAT)hydrogel and ensured the simplicity of the synthesis process.The hydrogel possessed high strain at break(1239%),stress(64.7 kPa),low hysteresis(100%to 500%strain,corresponding to dissipation energy from 1.37 to 7.80 kJ/m^(3)),and outstanding cycling stability(retained more than 90%of maximum stress after 200 ten-sile cycles).By integrating carbon nanotubes(CNTs)into PAAT hydrogel(PAATC),the PAATC hydrogel with excellent strain response performance was successfully constructed.The PAATC conductive hydro-gel exhibited high sensitivity(gauge factor(GF)=10.58 and sensitivity(S)=0.304 kPa^(-1)),wide strain response range(0.5%-1000%),fast response time(450 ms),and short recovery time(350 ms),excellent fatigue resistance,and strain response stability.Furthermore,the PAATC-based triboelectric nanogener-ator(TENG)displayed outstanding energy harvesting performance,which shows its potential for appli-cation in self-powered electronic devices.
基金supported by the National Natural Science Foundation of China(52173049 and 12072325)the Natural Science Foundation of Hunan Province(2021JJ40177)。
文摘太阳能驱动水蒸发是利用太阳能进行海水脱盐和清洁水生产的实用方法,具有最低的碳排放.但该方法在弱光照的阴天或夜间蒸发速率较低.本文基于光热和电热加热的耦合效应,提出了一种可以根据光照条件调节表面温度和蒸发速率的织物基全天候可用光热-电热蒸发器(P/ET-SG).由于电热层与光热层均匀的热分布,该P/ET-SG在1 V电压和1个太阳光辐照下其表面温度及蒸发速率可达52℃和2.61 kg m^(-2) h^(-1).P/ET-SG所采用的单向流体结构设计使其在连续24小时的海水脱盐过程中具备极高的耐盐性,且能除去蒸发表面的盐颗粒.此外,在高浓度盐水和污水净化中,P/ET-SG展现了高的蒸发速率(2.58 kg m^(-2) h^(-1))和净化效率(>99.9%).本文为全天候可用的高效太阳能蒸发器的设计提供了新思路,并提供了高浓度盐水和污水高效净化的新策略.
