水热合成Cs0.32WO3纳米粒子的结构特点及其近红外吸收特性

以钨酸钠和碳酸铯为原料,以D-苹果酸为还原剂,采用水热法成功合成了棒状Cs0.32WO3纳米粒子,并通过共混法将其与SiO2溶胶混合,在玻璃基板上制备了透明隔热涂层.采用X射线衍射（XRD）、扫描电镜（SEM）及紫外-可见-近红外漫反射吸收光谱对其进行表征,考察了粉体结晶度和微观形貌等结构特点对其近红外吸收性能的影响.结果表明:在水热合成过程中,原料的Cs/W比（摩尔比）为0.5时,可促进六方晶型Cs0.32WO3纳米粒子的生成;随着反应时间的增加,Cs0.32WO3纳米粒子形貌由不规则形状逐渐变成棒状;所得Cs0.32WO3纳米粒子的近红外吸收能力,随结晶度提高而提高,并且随纳米棒状形貌的形成而大幅提高.利用该纳米粒子制备的隔热玻璃保持了较高的可见光透过率,为71.6%,而近红外光透过率仅为10.2%,展现出优异的近红外屏蔽性能,表明Cs0.32WO3纳米材料在汽车车窗玻璃及建筑玻璃领域具有良好的应用前景.福建省科技重大专项(2014ZH0005-1

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^