Morphological control is recognized as a pivotal factor in developing high-performing solution-processed organic photovoltaics(OPVs).The essence of achieving optimal morphology in a sequentially deposited active layer...Morphological control is recognized as a pivotal factor in developing high-performing solution-processed organic photovoltaics(OPVs).The essence of achieving optimal morphology in a sequentially deposited active layer lies in the precise modulation of the micro-morphology of the donor phase,encompassing molecular arrangement,orientation,and crystalline structure.The micro-morphology of the polymer donor layer plays a significant role in determining the vertical composition distribution and the adequacy of the donor/acceptor(D/A)interfaces.In this work,self-solvent vapor annealing(S-SVA)is employed to meticulously engineer the π-πstacking and crystalline domains of polymer donor PM6.This is accomplished by precisely adjusting the evaporation kinetics of the self-solvent and leveraging the swelling effect induced by residual self-solvents,thereby enhancing the self-assembly of PM6 molecules.The resultant improvements inπ-πstacking and coherence length have led to efficient charge transport.These refinements have translated into a power conversion efficiency of 18.2%,accompanied by an open-circuit voltage of 0.886 V,a short-circuit current density of 25.9 mA cm^(-2),and a fill factor of 79.4%.The straightforward yet impactful method not only enhances film crystallinity and device performance but also holds broad application potential.展开更多
目的针对黄芩Scutellaria baicalensis黄酮类化合物水溶性不佳的问题,探索合理的解决策略。方法通过变换溶剂类型,分别选用甲醇、乙醇、水及75%乙醇作为提取溶剂,采用超声辅助技术提取黄芩饮片中的有效成分。利用冷场发射扫描电子显微镜...目的针对黄芩Scutellaria baicalensis黄酮类化合物水溶性不佳的问题,探索合理的解决策略。方法通过变换溶剂类型,分别选用甲醇、乙醇、水及75%乙醇作为提取溶剂,采用超声辅助技术提取黄芩饮片中的有效成分。利用冷场发射扫描电子显微镜(scanning electron microscope,SEM)观察不同溶剂所得提取物的微观结构,通过紫外分光光度法与标准曲线法对黄芩饮片中黄芩黄酮进行定量分析。进一步采用1H-NMR法明确组装体中主要化合物的结构。通过自组装与物理交联技术,制备了黄芩黄酮调控结构的水凝胶,利用SEM对比分析了基底水凝胶与黄芩黄酮复合水凝胶的形貌特征。采用流变学方法评估了2类水凝胶的流变性能,同时运用红外光谱技术分析了相互作用方式。通过溶胀性测试和缓释性能测试实验,分别探究了复合水凝胶中黄芩黄酮的调控作用和释放行为,并利用自由基清除实验评估了黄芩黄酮调控水凝胶的抗氧化性能。结果在超声辅助提取过程中,黄芩黄酮展现出与溶剂种类及超声功率密切相关的自组装特性。壳聚糖弱酸溶液(pH3.0~3.5)的引入,显著提升了黄芩黄酮的溶解度,并通过氢键作用实现了对高分子网络结构的浓度相关性调控。随着黄芩黄酮质量浓度的增加,水凝胶的网络结构变得更加致密且均匀,比表面积增大,孔隙尺寸介于微米与亚微米之间,这一结构特征有效延长了黄芩黄酮的释放时间。释放出的黄芩黄酮表现出高效的自由基清除能力,制备的水凝胶敷料能够显著促进大鼠慢性炎症伤口愈合。结论展示了黄芩黄酮提取过程中的溶剂效应,为合理选择提取溶剂提供了依据;提供了制备结构可调控水凝胶敷料的方法,为提高中药活性成分的生物利用度及设计高性能止血水凝胶敷料提供了理论基础。展开更多
基金financially supported by the Sichuan Science and Technology Program(2023NSFSC0990,2023YFH0085,2023YFH0086,and 2023YFH0087)the State Key Laboratory of Polymer Materials Engineering(sklpme2022-3-02,sklpme20232-11,and sklpme2024-2-15)。
文摘Morphological control is recognized as a pivotal factor in developing high-performing solution-processed organic photovoltaics(OPVs).The essence of achieving optimal morphology in a sequentially deposited active layer lies in the precise modulation of the micro-morphology of the donor phase,encompassing molecular arrangement,orientation,and crystalline structure.The micro-morphology of the polymer donor layer plays a significant role in determining the vertical composition distribution and the adequacy of the donor/acceptor(D/A)interfaces.In this work,self-solvent vapor annealing(S-SVA)is employed to meticulously engineer the π-πstacking and crystalline domains of polymer donor PM6.This is accomplished by precisely adjusting the evaporation kinetics of the self-solvent and leveraging the swelling effect induced by residual self-solvents,thereby enhancing the self-assembly of PM6 molecules.The resultant improvements inπ-πstacking and coherence length have led to efficient charge transport.These refinements have translated into a power conversion efficiency of 18.2%,accompanied by an open-circuit voltage of 0.886 V,a short-circuit current density of 25.9 mA cm^(-2),and a fill factor of 79.4%.The straightforward yet impactful method not only enhances film crystallinity and device performance but also holds broad application potential.
文摘目的针对黄芩Scutellaria baicalensis黄酮类化合物水溶性不佳的问题,探索合理的解决策略。方法通过变换溶剂类型,分别选用甲醇、乙醇、水及75%乙醇作为提取溶剂,采用超声辅助技术提取黄芩饮片中的有效成分。利用冷场发射扫描电子显微镜(scanning electron microscope,SEM)观察不同溶剂所得提取物的微观结构,通过紫外分光光度法与标准曲线法对黄芩饮片中黄芩黄酮进行定量分析。进一步采用1H-NMR法明确组装体中主要化合物的结构。通过自组装与物理交联技术,制备了黄芩黄酮调控结构的水凝胶,利用SEM对比分析了基底水凝胶与黄芩黄酮复合水凝胶的形貌特征。采用流变学方法评估了2类水凝胶的流变性能,同时运用红外光谱技术分析了相互作用方式。通过溶胀性测试和缓释性能测试实验,分别探究了复合水凝胶中黄芩黄酮的调控作用和释放行为,并利用自由基清除实验评估了黄芩黄酮调控水凝胶的抗氧化性能。结果在超声辅助提取过程中,黄芩黄酮展现出与溶剂种类及超声功率密切相关的自组装特性。壳聚糖弱酸溶液(pH3.0~3.5)的引入,显著提升了黄芩黄酮的溶解度,并通过氢键作用实现了对高分子网络结构的浓度相关性调控。随着黄芩黄酮质量浓度的增加,水凝胶的网络结构变得更加致密且均匀,比表面积增大,孔隙尺寸介于微米与亚微米之间,这一结构特征有效延长了黄芩黄酮的释放时间。释放出的黄芩黄酮表现出高效的自由基清除能力,制备的水凝胶敷料能够显著促进大鼠慢性炎症伤口愈合。结论展示了黄芩黄酮提取过程中的溶剂效应,为合理选择提取溶剂提供了依据;提供了制备结构可调控水凝胶敷料的方法,为提高中药活性成分的生物利用度及设计高性能止血水凝胶敷料提供了理论基础。
