Integrating Fluorinated Polymer and Manganese‐Layered Double Hydroxide Nanoparticles as pH‐activated 19F MRI Agents for Specific and Sensitive Detection of Breast Cancer

¹⁹F magnetic resonance imaging (¹⁹F MRI) agents capable of being activated upon interactions with cancer triggers are attracting increasing attention, although challenges still remain for precise and specific detection of cancer tissues. In this study, a novel hybrid ¹⁹F MRI agent for pH‐sensitive detection of breast cancer tissues is reported, a composite system designed by conjugating a perfluoropolyether onto the surface of manganese‐incorporated layered double hydroxide (Mn‐LDH@PFPE) nanoparticles. The ¹⁹F NMR/MRI signals from aqueous solutions of Mn‐LDH@PFPE nanoparticles are quenched at pH 7.4, but “turned on” following a reduction in pH to below 6.5. This is due to partial dissolution of Mn²⁺ from the Mn‐LDH nanoparticles and subsequent reduction in the effect of paramagnetic relaxation. Significantly, in vivo experiments reveal that an intense ¹⁹F MR signal can be detected only in the breast tumor tissue after intravenous injection of Mn‐LDH@PFPE nanoparticles due to such a specific activation. Thus pH‐activated Mn‐LDH@PFPE nanoparticles are a potential “smart” ¹⁹F MRI agent for precise and specific detection of cancer diseases.     

外墙氟碳涂料的应用

介绍了常温固化FC－S200系列氟碳涂料的材料特性，通过其施工工艺和施工中的质量缺陷及质量预控，对外墙涂料工程质量控制技术进行探讨和研究，以此推动外墙氟碳涂料等一系列超耐侯性建筑涂料在本地区的应用。     

空间高能电子辐照对氟橡胶性能的影响

本文研究了相同电子能量、不同剂量率的辐照对氟橡胶(Fluorine Rubber,FPM)电阻率特性和力学性能的影响。电子能量是2MeV,剂量率分别是1.5×10~5rad(Si)/h,1.5×10~6rad(Si)/h,1.5×10~7rad(Si)/h。结果表明:FPM的电阻率呈下降趋势,并且辐照剂量越大电阻率下降得越快;FPM的拉伸强度先变大,而后随着辐照剂量的增加拉伸强度又持续变小;FPM的断裂伸长率随着辐照剂量的增加而降低,与辐照剂量率没有关系。该研究获得的试验数据,对航天器设计过程中材料的选择和使用都具有实际的指导意义。     

Improving the Performance of Perovskite Solar Cells via a Novel Additive of N,1-Fluoroformamidinium Iodide with Electron-Withdrawing Fluorine Group

Additives are widely adopted for efficient perovskite solar cells (PSCs), and proper additive design contributes a lot to PSCs’ various breakthroughs. Herein, a novel additive of N,1-fluoroformamidinium iodide (F-FAI), whose cation replaces one amino group in guanidinium (GA⁺) with electron-withdrawing fluorine group, is synthesized and applied as the additive for PSCs. The electron-withdrawing effect of fluorine promotes the molecular polarity of N,1-fluoroformamidine (F-FA), enhancing the interaction of N,1-fluoroformamidinium (F-FA⁺) with MAPbI₃. Compared with the nonpolar GA⁺, F-FA⁺ improves the crystallinity, passivates the defect, and downshifts the Fermi level of MAPbI₃ more significantly. The charge transfer and built-in field in printable triple mesoscopic PSCs are therefore enhanced. Moreover, charge transport in MAPbI₃ is also promoted by F-FAI. With these benefits, a power conversion efficiency of 17.01% for printable triple mesoscopic PSCs with improved open-circuit voltage and fill factor is obtained with the addition of F-FAI, superior to the efficiency of 15.24% for those devices with guanidinium iodide additives.     

含氟盘状液晶研究进展

近年来，在分子中引入氟原子进行改性成为材料研究的热点之一。分子中引入氟原子后，可以影响其热性能、电荷输运性能以及液晶的相行为等，最终改善材料的热、光、电和磁等性质。含氟盘状液晶由于具有较高的载流子迁移率，其合成方法和性质得到了广泛的关注。在含氟盘状液晶分子的平面核上、外围侧链或桥体上取代的氟原子均能显著改变液晶的相变性质，如提升液晶相的热稳定性和柱状相的有序度等。该文综述了近十年来具有代表性的利用氟原子改性盘状液晶的研究进展，进一步证实了氟化有利于改善液晶性质，并进一步归纳了含氟盘状分子在其他领域的应用。盘状液晶氟化后所表现出的优异性能，有助于启发科研工作者在药物合成、无机材料等领域引入含氟材料。     

氟化铵在湿法磷酸装置氟吸收系统中的应用研究

为了解决磷酸浓缩装置氟吸收系统被硅胶堵塞问题,在磷酸浓缩装置氟吸收系统中引入氟化铵溶液。实验表明,加入氟化铵溶液带入的F为氟吸收系统中氟总量的5%左右,能有效溶解系统中的硅胶,确保循环系统吸收液的品质,使系统正常运行。     

平板薄片氟电极的研制

文章介绍了平板薄片氟电极的制作和性能测试过程，实验测试结果表明该电极是一种用途广泛，特别适于微量体积测量的新颖电极。     

沉降法处理氟涂料废水

有机氟涂料以其卓越的耐高温、超滑、憎油、憎水性能在纺织业、家电业得到日益广泛的应用。本文针对有机氟涂料生产过程中最后的调和工序所产生的洗涤废水 ,根据金属离子可以起破乳作用的原理 ,探讨以国内现有高分子絮凝剂对废水先沉降处理 ,再蒸发干化的处理方法。此处理法有设备简单、投资小、操作方便、效果好的特点 ,而且可以在有相同洗涤废水产生的纺织业染整厂和家电业涂装厂中运用     

浅析提高氟橡胶耐寒性的途径

从分子结构和配合体系两方面介绍了提高氟橡胶耐寒性的主要途径.对分子结构进行改性,引入能够破坏分子链规整性的侧基,或在主链上引入能够提高分子链柔顺性的基团,是提高氟橡胶耐寒性最有效的途径.另外,通过橡胶并用或添加合适的增塑剂,既可提高氟橡胶耐寒性,还能降低材料的成本.