为探讨低压静电场(low voltage electrostatic field,LVEF)处理对蝴蝶兰切花保鲜效果的影响,该研究以蝴蝶兰切花品种“天堂鸟”为试验对象,探究了低压静电场处理对蝴蝶兰切花瓶插期间观赏品质、理化指标及相关酶活性的变化,并通过低场...为探讨低压静电场(low voltage electrostatic field,LVEF)处理对蝴蝶兰切花保鲜效果的影响,该研究以蝴蝶兰切花品种“天堂鸟”为试验对象,探究了低压静电场处理对蝴蝶兰切花瓶插期间观赏品质、理化指标及相关酶活性的变化,并通过低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)技术分析蝴蝶兰切花的水分迁移和水分流失情况。结果表明:瓶插第28天时,与对照组相比,低压静电场组的蝴蝶兰切花能保持较好的外观形态,其鲜质量和花径分别显著(P<0.05)提高4.88%、4.98%,可溶性糖含量和可溶性蛋白含量分别显著(P<0.05)提高了0.75、4.09 mg/g,相对电导率和丙二醛(malondialdehyde,MDA)含量分别显著(P<0.05)降低了31.53%、21.96 nmol/g,超氧化物歧化酶(superoxide dismutase,SOD)、过氧化物酶(peroxidase,POD)和过氧化氢酶(catalase,CAT)的活性峰值分别显著(P<0.05)提高了19.58、20.77、20.21 U/g,同时,结果表明低压静电场处理延缓了蝴蝶兰切花的水分迁移和水分流失现象。综上,低压静电场处理延缓了蝴蝶兰切花的品质劣变,该研究结果可为其他切花的保鲜应用提供一定的理论依据和技术参考。展开更多
The research,fabrication and development of piezoelectric nanofibrous materials offer effective solutions to the challenges related to energy consumption and non-renewable resources.However,enhancing their electrical ...The research,fabrication and development of piezoelectric nanofibrous materials offer effective solutions to the challenges related to energy consumption and non-renewable resources.However,enhancing their electrical output still remains a significant challenge.Here,a strategy of inducing constrained phase separation on single nanofibers via shear force was proposed.Employing electrospinning technology,a polyacrylonitrile/polyvinylidene difluoride(PAN/PVDF)nanofibrous membrane was fabricated in one step,which enabled simultaneous piezoelectric and triboelectric conversion within a single-layer membrane.Each nanofiber contained independent components of PAN and PVDF and exhibited a rough surface.The abundant frictional contact points formed between these heterogeneous components contributed to an enhanced endogenous triboelectric output,showcasing an excellent synergistic effect of piezoelectric and triboelectric response in the nanofibrous membrane.Additionally,the component mass ratio influenced the microstructure,piezoelectric conformation and piezoelectric performance of the PAN/PVDF nanofibrous membranes.Through comprehensive performance comparison,the optimal mass ratio of PAN to PVDF was determined to be 9∶1.The piezoelectric devices made of the optimal PAN/PVDF nanofibrous membranes with rough nanofiber surfaces generated an output voltage of 20 V,which was about 1.8 times that of the smooth one at the same component mass ratio.The strategy of constrained phase separation on the surface of individual nanofibers provides a new approach to enhance the output performance of single-layer piezoelectric nanofibrous materials.展开更多
基金National Natural Science Foundation of China(No.52373281)National Energy-Saving and Low-Carbon Materials Production and Application Demonstration Platform Program,China(No.TC220H06N)。
文摘The research,fabrication and development of piezoelectric nanofibrous materials offer effective solutions to the challenges related to energy consumption and non-renewable resources.However,enhancing their electrical output still remains a significant challenge.Here,a strategy of inducing constrained phase separation on single nanofibers via shear force was proposed.Employing electrospinning technology,a polyacrylonitrile/polyvinylidene difluoride(PAN/PVDF)nanofibrous membrane was fabricated in one step,which enabled simultaneous piezoelectric and triboelectric conversion within a single-layer membrane.Each nanofiber contained independent components of PAN and PVDF and exhibited a rough surface.The abundant frictional contact points formed between these heterogeneous components contributed to an enhanced endogenous triboelectric output,showcasing an excellent synergistic effect of piezoelectric and triboelectric response in the nanofibrous membrane.Additionally,the component mass ratio influenced the microstructure,piezoelectric conformation and piezoelectric performance of the PAN/PVDF nanofibrous membranes.Through comprehensive performance comparison,the optimal mass ratio of PAN to PVDF was determined to be 9∶1.The piezoelectric devices made of the optimal PAN/PVDF nanofibrous membranes with rough nanofiber surfaces generated an output voltage of 20 V,which was about 1.8 times that of the smooth one at the same component mass ratio.The strategy of constrained phase separation on the surface of individual nanofibers provides a new approach to enhance the output performance of single-layer piezoelectric nanofibrous materials.
