摘要：作为新型伤口敷料,粘附性水凝胶已被广泛研究.然而,由于易失水和敷料更换时二次损伤的问题,粘附水凝胶敷料的临床应用仍然是一个重大挑战.本文中,我们设计了一种基于双键化丝素蛋白、单宁酸和聚氨酯二丙烯酸酯的具有保水性能和可撕断性能的粘附水凝胶敷料.通过复合具有大量儿茶酚基团的单宁酸,使得水凝胶具有增强的机械性能、良好的组织粘附性能、止血性能以及生物相容性能.随后将疏水性的聚氨酯二丙烯酸酯涂层聚合在水凝胶表面,该涂层的存在可以使水凝胶长时间保持高含水量.此外,由于该水凝胶的粘附能高于断裂能,其在剥离时可以被撕断,并最大程度减小对伤口部位的影响.动物实验结果表明,这种具有粘附止血性能的水凝胶可以通过提供长久的湿性愈合环境和无二次损伤的换料来加速伤口愈合.这些结果表明这种多功能水凝胶是一种具有临床应用前景的伤口敷料.

摘要：GaN-based laser diodes(LDs)extend the wavelength of semiconductor LDs into the visible and ultraviolet spectrum ranges,and are therefore expected to be widely used in quantum technology,bio&medical instruments,laser displays,lighting and materials *** development of blue and green LDs is still challenging,even though they are based on the sameⅢ-nitride materials as GaN-based lightemitting *** challenges and progress of GaN-based blue and green LDs are reviewed from the aspects of epitaxial growth and layer structure *** to large differences in lattice constants and growth conditions for InN,GaN,and AlN,considerable effort is required to improve the quality of InGaN multiple quantum well(MQW)gain medium for blue and especially green LDs.p-type doping profiles,conditions and layer structures are critical to reduce the internal losses and to mitigate the degradation of InGaN *** injection is also a key issue for GaN-based LDs.

摘要：Isolated cationic Pd species encapsulated in MFI zeolite,i.e.,Pd@MFI,have been successfully prepared via in situ hydrothermal route followed by oxidative *** as-prepared Pd@MFI samples are investigated as promising catalysts in the reaction of methane ***,Pd@H-ZSM-5 shows remarkable activity in methane catalytic combustion with a low apparent activation energy value of 70.7 kj/mol as well as good catalytic stability even in excess water *** characterization results demonstrate the strong interaction between Pd sites and zeolite framework in Pd@ZSM-5 and the efficient stabilization of isolated Pd sites by zeolite *** analyses reveal that the presence of BrΦnsted acid sites is beneficial to methane adsorption and its subsequent activation on adjacent Pd sites,constructing cooperation between Bronsted acid sites and Pd sites within the confined space of MFI zeolite toward high-efficiency methane catalytic *** reaction mechanism of methane combustion catalyzed by Pd@H-ZSM-5 model catalyst is finally discussed.

摘要：用一个时滞状态反馈控制律镇定惯性轮倒立摆,不仅保证闭环系统全局渐近稳定,还允许闭环系统承受一定的时滞.将惯性轮倒立摆转化为存在高阶非线性的4维积分器链,然后设计一个明确规定了饱和度和时滞参数的饱和控制律.用简单方式证明了闭环的全局渐近稳定性.仿真表明设计是有效的.

摘要：The practical application of solid polymer electrolytes in high-energy Li metal batteries is hindered by Li dendrites,electrochemical instability and insufficient ion *** address these issues,flexible composite polymer electrolyte(CPE)membranes with three dimensional(3D)aramid nanofiber(ANF)frameworks are facilely fabricated by filling polyethylene oxide(PEO)-lithium bis(trifluoromethylsulphonyl)imide(Li TFSI)electrolyte into 3D ANF *** of the unique composite structure design and the continuous ion conduction at the 3D ANF framework/PEO-Li TFSI interfaces,the CPE membranes show higher mechanical strength(10.0 MPa),thermostability,electrochemical stability(4.6 V at 60℃)and ionic conductivity than the pristine PEO-Li TFSI ***,the CPEs display greatly improved interfacial stability against Li dendrites(≥1000 h at 30℃under 0.10 m A cm-2),compared with the pristine electrolyte(short circuit in 13 h).The CPE-based all-solid-state LiFePO4/Li cells also exhibit superior cycling performance(e.g.,130 mA h g-1 with 93%retention after 100 cycles at 0.4 C)than the ANF-free cells(e.g.,82 mA h g-1 with 66%retention).This work offers a simple and effective way to achieve high-performance composite electrolyte membranes with 3D nanofiller framework for promising solid-state Li metal battery applications.

摘要：近年来,导电碳基质与过渡金属硫化物(TMS)的巧妙结合在超级电容器中取得了一系列的研究进展.然而,在长期的充/放电过程中,这些复合物在异质界面处较弱的兼容性和结合力通常导致TMS的剥离和电极容量的衰减.基于此,本文设计了一种简单且可扩展的原位硫化方法,用于构建稳定的超级电容器电极,其中多孔NiCo/C纳米纤维作为核芯,无定形NiCoS_(x)纳米片作为壳层,形成NiCo/C@NiCoS_(x)(CNCS)分级核壳结构.外部NiCoS_(x)纳米片的质量负载和尺寸在很大程度上取决于内部NiCo/C纳米纤维的碳化温度.优化后的CNCS电极表现出优异的比容量和良好的倍率性能.组装的非对称超级电容器具有突出的能量密度和较高的循环稳定性.这种调节异质界面的原位策略有望用于开发稳定的基于TMS的复合电极.