微波常压法制备三聚氰酸

研究了在常压条件下尿素与助溶剂通过微波辐射制备三聚氰酸的反应条件,结果表明,采用594W微波辐射3min,转化率达83．5％。     

离子色谱法在城市和背景区域SO2监测中的应用

介绍用无动力采样技术采集样品、离子色谱法分析SO2污染物浓度的监测方法。国际实验室间分析结果的比对实验表明,离子色谱法具有快捷、准确及自动化程度较高等优点。该方法在城市和背景区域环境空气背景值研究,如SO2污染物迁移规律、空气质量预测预报模型验证及远距离传输等方面具有很大的实用价值。     

射频磁控溅射CNx薄膜的结构与衬底温度关系的研究

使用射频磁控溅射方法在不同衬底温度下（ts=室温，350，500℃）于Si(001)衬底上沉积了CNx膜，并利用拉曼（Raman)光谱、傅里叶变换红外光谱（FTIR）及X射线衍射光电子能谱（XPS）对CNx膜的化学结合状态与温度的关系进行了研究。Raman光谱结果表明，随衬底温度（ts) 增加，D带向低频方向移动，G带向高频方向移动；它们的半高宽分别由375和150cm^-1减小至328和142cm^-1；ID／IG由3．76减小至2.88。FTIR谱中除无序D带（1400cm^-1)和石墨G带（1570cm^-1)外，还有－700cm^-1,～2210cm^-1(C=N),2330cm^-1(C-O)及3255－3351cm^-1(N-H)等峰。XPS测试结果表明：随衬底温度增加，N与C的物质的量比由0.49下降至0.38，sp^2(C-N)组分与sp^3(C-N)组分强度比呈增大趋势。低温（350℃）退火并未对CNx膜的化学结合状态产生较大影响；高温（900℃）退火样品则显示出较好的结晶化程度。     

Analysis of the Thermal Decomposition Path of SF6 on the Surface of Cu and its Oxides

Plasma Chemistry and Plasma Processing - Accurately grasping the decomposition path of SF6 on the surface of typical metals and metal oxides is the key to reveal the decomposition mechanism of...     

Chemical Characterization of Phenolic Compounds in Erigeron Injection by Rapid-Resolution LC Coupled with Multi-Stage and Quadrupole-TOF-MS

Rapid-resolution liquid chromatography coupled with electrospray ion trap multistage mass spectrometry (ESI-MS ⁿ ) and electrospray quadrupole-time-of-flight mass spectrometry (ESI-Q-TOF) has been utilized to separate and characterize the phenolic components in Erigeron injections. After extensive separation on the column, each peaks’ potential structures were obtained based on their accurate mass supplied by ESI-Q-TOF and chemical database retrieval, and confirmed by ESI-MS ⁿ . A total of 44 compounds were identified or tentatively characterized and fifteen of them reported for the first time. In addition, the developed method was applied to monitor the elimination of phenolic compounds in rats after intravenous administration of 4 mL kg^?1 Erigeron injection. The caffeoylquinic acids and flavonoids of the Erigeron injection were quickly degraded and most of them reached the low limit of detection (SNR < 3) at 2 h post-injection.     

活性碳纤维ZnO—SACF的制备及其对Ag^＋的氧化还原吸附

制备了含有ＺｎＯ的活性碳纤维ＺｎＯ－ＳＡＣＦ，借助ＡＡＳ，ＷＡＸＤ和ＳＥＭ探讨了ＺｎＯ－ＳＡＣＦ对Ａｇ＾＋的氧化还原吸附特性，并考察了ＺｎＯ在氧化还原中的作用。结果表明，ＺｎＯ－ＳＡＣＦ比ＳＡＣＦ具有对Ａｇ＾＋更高的氧化还原吸附量。外加ＺｎＯ的实验发现，ＺｎＯ本身并不吸附Ａｇ＾＋，但却参与氧化还原反应，中和氧化还原体系所释放出的Ｈ＾＋，提高了体系的ＰＨ值，可以认为，ＰＨ值的提高有利于ＳＡＣＦ电极电     

Peripherally Heavy-Atom-Decorated Strategy Towards High-Performance Pure Green Electroluminescence with External Quantum Efficiency over 40 %

Heavy-atom integration into thermally activated delayed fluorescence (TADF) molecule could significantly promote the reverse intersystem crossing (RISC) process. However, simultaneously achieving high efficiency, small roll-off, narrowband emission and good operational lifetime remains a big challenge for the corresponding organic light-emitting diodes (OLEDs). Herein, we report a pure green multi-resonance TADF molecule BN-STO by introducing a peripheral heavy atom selenium onto the parent BN-Cz molecule. The organic light-emitting diode device based on BN-STO exhibited state-of-the-art performance with a maximum external quantum efficiency (EQE) of 40.1 %, power efficiency (PE) of 176.9 lm W⁻¹, well-suppressed efficiency roll-off and pure green gamut. This work reveals a feasible strategy to reach a balance between fast RISC process and narrow full width at half maximum (FWHM) of MR-TADF by heavy atom effect.