ZnS：Mn^2＋,Eu^3＋发光纳米材料的油-水界面法合成

以硬脂酸锌为Zn源、硫化钠为S源,首次采用油水界面法制备出单分散于环己烷和甲苯的ZnS纳米材料,探索有机溶剂、锌源和油酸浓度等对紫外吸收影响的同时,以ZnS为基质,掺杂Mn^2＋和Eu^3＋制得ZnS：Mn^2＋,Eu^3＋发光纳米材料,采用高分辨率透射电子显微镜（HRTEM）、X射线粉末衍射仪（XRD）、紫外可见（UV-VIS）和荧光分光光度计（PL）对产物进行了表征,紫外和HRTEM测试结果均表明,产物为单分散性,平均粒径为4.3 nn;荧光测试表明,产物所发荧光较强,肉眼可观测到明显的橙黄色（585 nm）和橙红色（616 nm）发光;XRD结果显示,产物结构为立方闪锌矿结构     

纳米材料的表征

综述了常用的纳米材料表征方法，简单介绍了其原理及应用。并对近期发展起来的SPM探针现的同科技纳米表征技术进行了介绍。     

Aminal-Linked Covalent Organic Frameworks with hxl-a and Quasi-hcb Topologies for Efficient C2H6/C2H4 Separation

In reticular chemistry, topology is a powerful concept for defining the structures of covalent organic frameworks (COFs). However, due to the lack of diversity in the symmetry and reaction stoichiometry of the monomers, only 5% of the two-dimensional topologies have been reported to be COFs. To overcome the limitations of COF connectivity and pursue novel topologies in COF structures, two aminal-linked COFs, KUF-2 and KUF-3,  are prepared, with dumbbell-shaped secondary building units. Linear dialdehydes and piperazine are condensed at a ratio of 1:2 to construct an aminal linkage, leading to unreported hxl-a ( KUF-2 ) and quasi- hcb ( KUF-3 ) structures. Notably, KUF-3 displays top-tier C₂H₆/C₂H₄ selectivity and C₂H₆ uptake at 298 K, outperforming most porous organic materials. The intrinsic aromatic ring-rich and Lewis basic pore environments, and appropriate pore widths enable the selective adsorption of C₂H₆, as confirmed by Grand Canonical Monte Carlo simulations. Dynamic breakthrough curves revealed that C₂H₆ can be selectively separated from a gas mixture of C₂H₆ and C₂H₄. This study suggests that topology-based design of aminal-COFs is an effective strategy for expanding the field of reticular chemistry and provides the facile integration of strong Lewis basic sites for selective C₂H₆/C₂H₄ separation.