Interfacial Interaction of Multifunctional GQDs Reinforcing Polymer Electrolytes For All-Solid-State Li Battery

Solid-state polymer electrolytes are highly anticipated for next generation lithium ion batteries with enhanced safety and energy density. However, a major disadvantage of polymer electrolytes is their low ionic conductivity at room temperature. In order to enhance the ionic conductivity, here, graphene quantum dots (GQDs) are employed to improve the poly (ethylene oxide) (PEO) based electrolyte. Owing to the increased amorphous areas of PEO and mobility of Li⁺, GQDs modified composite polymer electrolytes achieved high ionic conductivity and favorable lithium ion transference numbers. Significantly, the abundant hydroxyl groups and amino groups originated from GQDs can serve as Lewis base sites and interact with lithium ions, thus promoting the dissociation of lithium salts and providing more ion pathways. Moreover, lithium dendrite is suppressed, associated with high transference number, enhanced mechanical properties and steady interface stability. It is further observed that all solid-state lithium batteries assembled with GQDs modified composite polymer electrolytes display excellent rate performance and cycling stability.     

管道开孔切割及对接焊缝焊接的工作站测量系统设计

管道焊接工作站系统在切割和焊接加工过程中,管件的椭圆度、加工精度、变位机对工件夹持的水平度和同心度、以及旋转中管件的扰动和跳动度等因素,均会对切割和焊接的质量和效果产生不利影响,设计的管件测量系统通过测量工件参数,实现工作站系统对管件的自动找水平、自动寻找管件中心位置的功能。大量的切割和焊接实践证明,带有测量系统的焊接工作站系统取得了良好的切割和焊接效果。     

pH值偏移大豆油体-姜黄素复合乳液的物理特性及稳定性

以大豆油体为原料，利用油体天然水包油结构，借助pH值偏移法将姜黄素负载到油体油相内核中，制备姜黄素递送体系。通过乳液包封率、粒径、Zeta电位、显微结构等研究其包封特征，通过内源荧光光谱、十二烷基硫酸钠-聚丙烯酰胺凝胶电泳分析其结构变化，探讨其贮藏稳定性、pH值稳定性及氧化稳定性。结果表明：大豆油体借助pH值偏移可成功包封姜黄素，pH值偏移为1.0时，大豆油体对姜黄素的包封效果最佳，乳液包封率为65.55%；脂滴形状规则、大小均匀，平均粒径为590.5 nm；氧化稳定性良好，但贮藏稳定性、pH值稳定性较差；蛋白质结构与未处理油体相比，未发生明显改变。本研究为天然油体运载姜黄素等亲脂性多酚物质提供一定参考。