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pH-responsive copper-cluster-based dual-emission ratiometric fluorescent probe for imaging of bacterial metabolism
No full textThe profiling of bacterial metabolism is of great significance in practical applications. Therefore, the development of ultrasensitive and highly selective probe for bacterial metabolism detection and imaging is extremely desirable. Herein, a novel dual-emission pH-response bacterial metabolism detection and imaging probe is successfully developed. This probe consists of large-sized and easily separated SiO2 microspheres, copper nanoclusters (Cu NCs) with red emission, and carbon dots (CDs) with blue emission through in-situ self-assembly. In this system, the fluorescence of Cu NCs is sensitive to pH change due to their obvious aggregation-induced emission enhancement (AIEE) property, while the blue fluorescence of CDs remained almost stable. Therefore, red fluorescence and blue fluorescence are compounded with different fluorescence intensity at different pH values, and their fluorescence ratio is also different. By observation of composite fluorescence color, the visual colorimetric pH detection can be realized with the change of pH value of 0.2 units. Utilizing this system, we are able to detect bacterial metabolism with high signal-to-noise ratio, and it can also be used for bacterial metabolic imaging. Therefore, the pH-responsive Cu NCs-based dual-emission ratiometric fluorescent probe we constructed can provide new ideas for bacterial detection, antimicrobial sterilization, and biological imaging
Construction of Hybrid Bimetallic Uranyl Compounds Based on a Preassembled Terpyridine Metalloligand
No full textSix hybrid uranyl-transition metal compounds [UO2Ni(cptpy)(2)(HCOO)(2)(DMF)(H2O)] (1), [UO2Ni(cptpy)(2)(BTPA)(2)] (2), [UO2Fe(cptpy)(2)(HCOO)(2)(DMF)(H2O)] (3), [UO2Fe(cptpy)(2)(BTPA)(2)] (4), [UO2Co(cptpy)(2)(HCOO)(2)(DMF)(H2O)] (5), and [UO2Co(cptpy)(2)(BTPA)(2)] (6), based on bifunctional ligand 4 '-(4-carboxyphenyl)-2,2 ':6 ',2 ''-terpyridine (Hcptpy) are reported (H(2)BTPA = 4,4 '-biphenyldicarboxylic acid). Single-crystal XRD revealed that all six compounds feature similar metalloligands, which consist of two cptpy(-) anions and one transition metal cation. The metalloligand M(cptpy)(2) can be considered to be an extended linear dicarboxylic ligand with length of 22.12 angstrom. Compounds 1, 3, and 5 are isomers, and all of them feature 1D chain structures. The adjacent 1D chains are connected together by hydrogen bonds and pi-pi interactions to form a 3D porous structure, which is filled with solvent molecules and can be exchanged with I-2. Compounds 2, 4, and 6 are also isomers, and all of them feature 2D honeycomb (6,3) networks with hexagonal units of dimensions 41.91x26.89 angstrom, which are the largest among uranyl compounds with honeycomb networks. The large aperture allows two sets of equivalent networks to be entangled together to result in a 2D+2D -> 3D polycatenated framework. Remarkably, these uranyl compounds exhibit high catalytic activity for cycloaddition of carbon dioxide. Moreover, the geometric and electronic structures of compounds 1 and 2 are systematically discussed on the basis of DFT calculations
咪唑啉衍生物在混凝土模拟孔隙液中对Q235碳钢的缓蚀作用
No full text以油酸和二乙烯三胺为原料合成油酸咪唑啉,依次加入碘代正丁烷、N-苯基硫脲,生成咪唑啉苯基硫脲碘代正丁烷季铵盐缓蚀剂。采用红外光谱、拉曼光谱、元素分析和核磁共振等测试手段对其结构进行表征。重点探究在不同浓度缓蚀剂下Q235碳钢在3.5wt.%的氯化钠(NaCl)混凝土模拟孔隙液中的缓蚀行为,通过失重试验、电化学分析对其缓蚀性能进行了探究。试验结果表明,浓度为8.0g/L的咪唑啉苯基硫脲碘代正丁烷季铵盐缓蚀剂在3.5wt.%的氯化钠(NaCl)混凝土模拟孔隙液中对Q235碳钢具有优异的缓蚀效果。采用扫描电镜、吸附等温模型、傅里叶红外光谱仪(FT-IR)和量子化学分析等手段证实了咪唑啉苯基硫脲碘代正丁烷季铵盐缓蚀剂可在碳钢表面稳定吸附,从而提升了Q235碳钢在3.5wt.%的氯化钠(NaCl)混凝土模拟孔隙液中的耐蚀性能
水射流激光加工对7075铝合金影响规律的试验研究
No full text为实现对大厚度材料的高质量加工,采用自主研发的水射流红外激光加工系统,研究在不同工作距离下水射流激光对7075铝合金的切割深度、切缝宽度、表面粗糙度的影响规律。结果表明:随着工作距离增加,第一道切深从0.698 mm缩短至0.498 mm,切穿的缝宽度从75.32μm增加至81.85μm,而切深增加速率和表面粗糙度值均呈现先增加后减小的趋势。基于试验结果分析,在工作距离6 mm处可实现深度10.437 mm的7075铝合金打孔加工,孔半径为1.028 mm,平均加工次数35次,为实现大厚度材料的加工奠定了基础
高功率密度激发荧光材料的反常热猝灭效应
No full text荧光转换材料普遍存在的发光强度随温度升高而降低的热猝灭现象严重影响了器件的性能,限制了其在高功率发光二极管(LED)/激光二极管(LD)照明中的应用。然而,部分荧光材料却会出现随着温度升高发光强度增大的现象,即反常热猝灭效应。反常热猝灭作为提升发光材料及其器件应用性能的有效途径得到了广泛研究。本文总结了目前反常热猝灭效应在发光领域的研究现状及应用,阐述了发光反常热猝灭的机理,并对其未来发展趋势进行了展望,以期开发出具有更优反常热猝灭特性的新型发光材料,满足高效高功率LED/LD照明器件的应用需求
喷墨打印在大尺寸OLED显示中的应用
No full text显示作为信息交互的窗口,在当前信息科技发展中的地位愈加重要.随着信息化尤其是大数据等的发展,人们对大尺寸显示的需求大增.主动发光OLED(organic light-emitting diode)显示技术是下一代终端显示的有力竞争者,但在大尺寸显示领域并未展现明显的优势,已商业化的仅有白光OLED技术,但是白光OLED屏的价格居高不下. QD-OLED是即将推出的另一种大尺寸OLED显示技术,但量产时间一再推迟.这些都限制了OLED在大尺寸显示领域的商业应用.喷墨打印技术具有诸多优点,是目前最适合大尺寸OLED的制备技术,也是显示行业的重点研发方向,但喷墨打印OLED在器件性能上的不足限制了其商业化应用.因此,实现高效稳定的印刷OLED具有重要意义.本文将从大尺寸OLED显示技术现状开始,简介喷墨打印OLED相关材料与器件的进展,及其在大尺寸显示领域的应用,并提出今后可能的发展方向
油气计量装置弯管接头腐蚀失效的原因
No full text采用宏观形貌、显微组织观察,腐蚀产物成分分析和电化学方法,分析了某采油厂计量装置采用的弯管接头在原油介质中发生穿孔的原因。结果表明:失效弯管接头热影响区存在焊接缺陷,导致其耐腐蚀性能减弱;腐蚀产物主要成分为FeOOH,氧腐蚀为主要腐蚀类型;弯管接头外弧侧耐腐蚀性能最弱,且不断受到流体冲蚀,腐蚀加剧,最终形成穿孔
全固态锂电池的电极制备与组装方法
No full text全固态锂电池由于具有安全性高、循环寿命长、能量密度高等特点,在化学电源领域具有非常好的应用前景。因全固态锂电池是一种使用固体电极材料和固体电解质材料,不含任何液体的锂电池,所以全固态锂电池的电极制备以及组装与现有液态锂电池的方法存在较大差异。本文详细综述了典型的几类全固态锂电池的电极制备与组装方法及相应的性能特征,分别针对氧化物、硫化物以及聚合物固体电解质体系,归纳分析其结构、正极制备方法、负极修饰方法以及电池组装方式,并在最后对全固态锂电池的实验室开发组装方式给出了建议,为全固态电池研究的同行们提供借鉴和参考
退役动力锂电池在光储微电网的集成与应用
No full text为实现退役动力锂电池在光储微电网系统中的集成与应用,从整包利用的角度出发,检查80 V-60 A·h电池包的外观、铭牌、开路电压、BMS通讯情况对其进行初选,通过充放电测试对电池包完成二次筛选,并依据容量大小对电池进行分组,结合多通道储能变流器将电池成组,应用于光储微网系统中。结果显示:80个电池包有8个存在外观、开路电压和BMS通讯问题,22个存在容量和C_D-OCV曲线异常。剩余50个电池包容量最大值为49.46 A·h,容量最小值为45.58 A·h,极差值为3.88 A·h,占额定容量的6.5%,一致性较好;在0.1、0.2、0.3、0.5 C等不同倍率下对电池进行充放电,成组后的电池C_D-OCV曲线离散度较小;按0.05 C倍率充电、0.1 C倍率放电进行削峰填谷,充电量为111 k W·h,放电量为103 k W·h,转化效率92.79%。表明筛选和成组后的电池充放电性能正常,具备梯次利用价值
基于DLP成型的碳纤维增强光敏树脂3D打印工艺及性能
No full text数字光处理(DLP) 3D打印采用数字面曝光成型方法,具有打印速度快、成型精度高的特点。为了在保证试件成型质量的同时,提高其力学性能,以工业应用光敏树脂(Violinist)和碳纤维(100目)为原料,以碳纤维质量分数、单层固化深度和单层曝光时间为影响因素,进行正交实验并对试件成型精度和力学性能进行测试和分析。研究结果表明,随着碳纤维质量分数的增加,试件的拉伸强度呈上升趋势,成型精度呈下降趋势;在碳纤维质量分数为15%,单层固化深度为0.04 mm,单层曝光时间为3 s时,试件的拉伸强度和成型精度可满足打印要求,此时制件的成型质量最优。该研究对制定DLP 3D打印复合材料工艺及提升打印制件力学强度具有较好的参考价值