Two-dimensional materials for flexible energy storage commonly facehuge challenges in limited active surface and hindered charge transport.Herein,wereport an innovative asymmetric pseudocapacitor based on synergistic ...Two-dimensional materials for flexible energy storage commonly facehuge challenges in limited active surface and hindered charge transport.Herein,wereport an innovative asymmetric pseudocapacitor based on synergistic design of modifiedMXene and graphene,integrating gas-induced rapid expansion technology andprecise surface chemical regulation methods.For graphene modification,rapid vaporizationinduces exfoliation and expansion of graphene oxide layers.Subsequently,pseudocapacitiveoxygen-containing groups were selectively introduced through acid oxidation,yielding expanded-and-oxidized graphene(OEG)for positive porous-nanopaperelectrode.For MXene modification,alkali-treated MXene underwent hydrazine assistance to facilitate gas expansion and-NH_(2)grafting,producing MXene-NH_(2)(NOM)for negative porous-nanopaper electrode.Density functional theory calculations show that-COOH moreeffectively modulate graphene’s electronic structure by inducing charge redistribution and creating active sites,thereby enhancing H^(+)adsorption and ion interactions compared to-OH.Meanwhile,-NH_(2)on MXene enable electron delocalization and dynamic Ti-N-H^(+)interactions,speeding up proton adsorption/desorption and boosting both pseudocapacitance and conductivity.Through collaborativeoptimized spatial architecture and surface properties,flexible OEGB and NOMB exhibited of 333.6 and 500.5 F g^(-1)at high mass loading,respectively.The assembled proton pseudocapacitor readily achieved energy and power densities of 58.9 Wh kg^(-1)and 3802 W kg^(-1),respectively,with excellent stability for potential applications.展开更多
目的应用氢质子磁共振波谱(hydrogen proton magnetic resonance spectroscopy,1H-MRS)技术检测2型糖尿病合并急性脑梗死患者代谢物指标,探究其与糖化血红蛋白(glycated hemoglobin A1c,HbA1c)水平的相关性。方法回顾性选取2024年2月—2...目的应用氢质子磁共振波谱(hydrogen proton magnetic resonance spectroscopy,1H-MRS)技术检测2型糖尿病合并急性脑梗死患者代谢物指标,探究其与糖化血红蛋白(glycated hemoglobin A1c,HbA1c)水平的相关性。方法回顾性选取2024年2月—2025年3月泰安市中心医院(青岛大学附属泰安市中心医院、泰山医养中心)收治的90例2型糖尿病患者的临床资料,其中合并急性脑梗死为研究组(54例),未合并急性脑梗死为对照组(36例)。根据HbA1c的水平将研究组分为研究1组(HbA1c<7.0%)、研究2组(HbA1c 7.0%~9.0%)和研究3组(HbA1c>9.0%)。所有研究对象均进行1H-MRS检测,分析HbA1c水平与N-乙酰天门冬氨酸/肌酸(N-acetylaspartate to creatine ratio,NAA/Cr)、乳酸/肌酸(lactate to creatine ratio,Lac/Cr)的关系。结果研究组NAA/Cr低于对照组,HbA1c水平、Lac/Cr均高于对照组,差异均有统计学意义(P均<0.05)。研究1组、研究2组与研究3组组间NAA/Cr、Lac/Cr对比,差异均有统计学意义(P均<0.05)。HbA1c与NAA/Cr呈负相关(r=-0.974,P<0.001),与Lac/Cr呈正相关(r=0.986,P<0.001)。结论对2型糖尿病合并急性脑梗死患者应用1HMRS技术检测,HbA1c水平与NAA/Cr呈负相关,与Lac/Cr呈正相关。展开更多
The damage effect of methyl silicone rubber reinforced with MQtype silicone resin which composed of monofunctional siliconoxygen unit and tetrafunctional siliconoxygen unit under 150 keV proton radiation was studied u...The damage effect of methyl silicone rubber reinforced with MQtype silicone resin which composed of monofunctional siliconoxygen unit and tetrafunctional siliconoxygen unit under 150 keV proton radiation was studied using space combined radiation simulator.The experimental results show that there were aging cracks appearing on the surface of the rubber after irradiation.With a lower irradiation fluence(<1014 cm-2),the hardness and tensile strength of the rubber increase;the elongation at break decreases;the storage modulus at lower temperatures increases;the glass-transition temperature moves to higher temperature band,the Si—O content increases;the main damage of the silicone rubber is caused by the crosslinking effect.While with a higher irradiation fluence(>1014 cm-2),the hardness and tensile strength of the rubber decrease,the elongation at break increases,the storage modulus at lower temperatures decreases,the glass-transition temperature moves to lower temperature band,the Si—O content decreases,the main damage of the silicone rubber is caused by the degradation effect.A mass loss of the silicone rubber can be caused by the proton irradiation because the volatile substances generated by the degradation of silicone rubber subjected to proton irradiation can be extracted in the high vacuum environment.展开更多
基金supported by the National Nature Science Foundation of China(No.52402126)Shaanxi Province Qin Chuangyuan general window four chain integration project(No.2024PT-ZCK-09)+3 种基金Shaanxi Province military-civilian integration project(Shaanxi finance office【2024】22nd)Qinchuangyuan introducing high-level innovation and entrepreneurship talent projects(NO.QCYRCXM-2022-343)the China Postdoctoral Science Foundation(Grant Number:2025M772524)National Nature Science Foundation of China(22508239).
文摘Two-dimensional materials for flexible energy storage commonly facehuge challenges in limited active surface and hindered charge transport.Herein,wereport an innovative asymmetric pseudocapacitor based on synergistic design of modifiedMXene and graphene,integrating gas-induced rapid expansion technology andprecise surface chemical regulation methods.For graphene modification,rapid vaporizationinduces exfoliation and expansion of graphene oxide layers.Subsequently,pseudocapacitiveoxygen-containing groups were selectively introduced through acid oxidation,yielding expanded-and-oxidized graphene(OEG)for positive porous-nanopaperelectrode.For MXene modification,alkali-treated MXene underwent hydrazine assistance to facilitate gas expansion and-NH_(2)grafting,producing MXene-NH_(2)(NOM)for negative porous-nanopaper electrode.Density functional theory calculations show that-COOH moreeffectively modulate graphene’s electronic structure by inducing charge redistribution and creating active sites,thereby enhancing H^(+)adsorption and ion interactions compared to-OH.Meanwhile,-NH_(2)on MXene enable electron delocalization and dynamic Ti-N-H^(+)interactions,speeding up proton adsorption/desorption and boosting both pseudocapacitance and conductivity.Through collaborativeoptimized spatial architecture and surface properties,flexible OEGB and NOMB exhibited of 333.6 and 500.5 F g^(-1)at high mass loading,respectively.The assembled proton pseudocapacitor readily achieved energy and power densities of 58.9 Wh kg^(-1)and 3802 W kg^(-1),respectively,with excellent stability for potential applications.
文摘目的应用氢质子磁共振波谱(hydrogen proton magnetic resonance spectroscopy,1H-MRS)技术检测2型糖尿病合并急性脑梗死患者代谢物指标,探究其与糖化血红蛋白(glycated hemoglobin A1c,HbA1c)水平的相关性。方法回顾性选取2024年2月—2025年3月泰安市中心医院(青岛大学附属泰安市中心医院、泰山医养中心)收治的90例2型糖尿病患者的临床资料,其中合并急性脑梗死为研究组(54例),未合并急性脑梗死为对照组(36例)。根据HbA1c的水平将研究组分为研究1组(HbA1c<7.0%)、研究2组(HbA1c 7.0%~9.0%)和研究3组(HbA1c>9.0%)。所有研究对象均进行1H-MRS检测,分析HbA1c水平与N-乙酰天门冬氨酸/肌酸(N-acetylaspartate to creatine ratio,NAA/Cr)、乳酸/肌酸(lactate to creatine ratio,Lac/Cr)的关系。结果研究组NAA/Cr低于对照组,HbA1c水平、Lac/Cr均高于对照组,差异均有统计学意义(P均<0.05)。研究1组、研究2组与研究3组组间NAA/Cr、Lac/Cr对比,差异均有统计学意义(P均<0.05)。HbA1c与NAA/Cr呈负相关(r=-0.974,P<0.001),与Lac/Cr呈正相关(r=0.986,P<0.001)。结论对2型糖尿病合并急性脑梗死患者应用1HMRS技术检测,HbA1c水平与NAA/Cr呈负相关,与Lac/Cr呈正相关。
文摘The damage effect of methyl silicone rubber reinforced with MQtype silicone resin which composed of monofunctional siliconoxygen unit and tetrafunctional siliconoxygen unit under 150 keV proton radiation was studied using space combined radiation simulator.The experimental results show that there were aging cracks appearing on the surface of the rubber after irradiation.With a lower irradiation fluence(<1014 cm-2),the hardness and tensile strength of the rubber increase;the elongation at break decreases;the storage modulus at lower temperatures increases;the glass-transition temperature moves to higher temperature band,the Si—O content increases;the main damage of the silicone rubber is caused by the crosslinking effect.While with a higher irradiation fluence(>1014 cm-2),the hardness and tensile strength of the rubber decrease,the elongation at break increases,the storage modulus at lower temperatures decreases,the glass-transition temperature moves to lower temperature band,the Si—O content decreases,the main damage of the silicone rubber is caused by the degradation effect.A mass loss of the silicone rubber can be caused by the proton irradiation because the volatile substances generated by the degradation of silicone rubber subjected to proton irradiation can be extracted in the high vacuum environment.
