Cationic Cd(II) metal − organic framework based on tetrakis(1,2,4-triazol-1-yl)methane

Abstract

Solvothermal reaction of a multidentate ligand (tetrakis[4-(1-triazolyl)phenyl]-methane (ttpm)), with Cd(NO₃)₂ afforded a cationic Cd(II) coordination polymer {[Cd(ttpm)·DMSO]·2NO₃}_n. Single-crystal X-ray diffraction analyses showed that ttpm belonged to the tetragonal space group I4₁/a, and 1 was a 2-D (4,4) network. 1-D channels along the c direction exist in the 3D stacking map to accommodate the charge-balancing NO₃^? anions. N₂ adsorption/desorption experiments showed the framework had a BET surface area of 11.36?m²·g^?1. Compared with luminescence of ttpm, 1 showed red-shifted luminescence spectra with higher intensity from the more rigid arrangement of the π systems.     

Adsorption of thorium(IV) from aqueous solutions by poly(cyclotriphosphazene-co-4,4′-diaminodiphenyl ether) microspheres

Journal of Radioanalytical and Nuclear Chemistry - Poly(cyclotriphosphazene-co-4,4′-diaminodiphenyl ether) microspheres (PZA) was based on hexachlorocyclotriphosphazene (HCCP) and...     

硫熏中药材品质及其毒理学研究进展

硫磺熏蒸是我国传统中药材干燥的一种加工方法,该方法具有杀虫、防霉、防腐和增白等功效。近年来研究发现,硫磺熏蒸会导致中药材某些活性成分转化生成新的含硫衍生物,导致其在人体的代谢过程和药效发生改变,甚至引发毒性反应,存在安全隐患。本文在现有文献的基础上归纳总结硫元素的各种形态、硫磺熏蒸中药材化学成分的转化规律及其毒理学研究,为进一步评价硫熏工艺的合理性研究提供理论参考。     

基于Aerolysin纳米孔道对单个c-di-AMP分子的检测研究

环二腺苷酸(c-di-AMP)是原核细胞中普遍存在的第二信使, 不仅能够有效调控细胞生长、离子转运、细胞壁代谢平衡等多种生理过程, 还能引发I型干扰素应答, 激发机体天然免疫反应. 本实验使用单个气单胞菌溶素(Aerolysin)纳米孔道蛋白构建的单分子界面, 对c-di-AMP进行单分子测量研究. 为提高Aerolysin纳米孔对带负电小分子化合物的测量灵敏度, 本实验利用LiCl为支持电解质, 有效屏蔽Aerolysin孔口表面负电荷, 减小c-di-AMP与Aerolysin纳米孔之间的静电排斥, 从而显著增强了Aerolysin纳米孔道对单个c-di-AMP分子的检测能力. 实验结果显示, 在90 mV电压下, 每分钟在LiCl中获得的有效穿孔事件的数量最高可达同条件KCl支持电解质的30倍, 且有效穿孔事件占总体事件的比例在不同电压下提升了7~11倍. 进一步表明, 使用LiCl支持电解质, 可有效增强Aerolysin孔道对带负电小分子化合物的测量灵敏度. 因此, 本研究实现了Aerolysin纳米孔道对单个环二核苷酸的高灵敏免标记检测, 有望为单分子水平上阐明新型免疫干扰机制提供新的分析方法.     

Efficient activation of peroxymonosulfate by hollow cobalt hydroxide for degradation of ibuprofen and theoretical study

Hollow microsphere structure cobalt hydroxide (h-Co(OH)₂) was synthesized via an optimized solvothermal-hydrothermal process and applied to activate peroxymonosulfate (PMS) for degradation of a typical pharmaceutically active compound, ibuprofen (IBP). The material characterizations confirmed the presence of the microscale hollow spheres with thin nanosheets shell in h-Co(OH)₂, and the crystalline phase was assigned to α-Co(OH)₂. h-Co(OH)₂ could efficiently activate PMS for radicals production, and 98.6% of IBP was degraded at 10 min. The activation of PMS by h-Co(OH)₂ was a pH-independent process, and pH 7 was the optimum condition for the activation-degradation system. Scavenger quenching test indicated that the sulfate radical (SO₄^{? ?}) was the primary reactive oxygen species for IBP degradation, which contributed to 75.7%. Fukui index (f ^?) based on density functional theory (DFT) calculation predicted the active sites of IBP molecule for SO₄^{? ?} attack, and then IBP degradation pathway was proposed by means of intermediates identification and theoretical calculation. The developed hollow Co(OH)₂ used to efficiently activate PMS is promising and innovative alternative for organic contaminants removal from water and wastewater.     

室温钠离子电池关键材料研究进展

钠离子电池凭借钠资源丰富、价格低廉在大规模储能领域有着重要应用前景. 然而,钠离子相对锂离子较大的半径和质量限制了它在电极材料中的可逆脱嵌,导致其电化学性能不佳. 因此研发稳定、高效储钠的高比能电极材料是钠离子电池实用化的关键. 另外,进一步优化与电极材料相匹配的电解质来实现高安全、长寿命钠离子电池的构建,推动其商业化进程,也是迫切需要解决的问题. 本文主要对室温钠离子电池关键材料（包括正极、负极和电解质材料）的研究进展进行简要综述,并探讨了其面临的困难及可行的解决方案,为钠离子电池的发展提供一定参考依据.     

Fabrication and In vitro Bioactivity of Robust Hydroxyapatite Coating on Porous Titanium Implant

Compared witli the traditional dental implant, TixOs■ manufactured by direct laser metal forming(DLMF) technology exhibits improved capability for bone osteointegration due to its porous surface structure, and has achieved remarkable clinical effect. However, like the traditional titanium and other alloyed implants, the porous titanium implant TixOsR also has relatively weak bioactivity. To address this issue, a proper surface modification method may be needed. Hydroxyapatite(HA) has been widely used in implant surface coating for its similar chemical composition to bone tissue and its osteoconductive properties. Thus, combining TixOs■ implants with hydroxyapatite can be an efficient way to enhance their bioactivity. We herewith reported a competent pulsed laser deposition(PLD) method of coating nano-sized HA thin film onto the porous TixOs■ implant. The HA coatings were characterized by means of scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS), X-ray photoelectron spectroscopy(XPS) and focused ion beam(FIB) method, and nanocrystal sized thin HA films were identified on the surface of TixOs■ implants. The low cytotoxicity and improved cell proliferation ability of HA coated implants were further tested and verified using MC 3T3 E1 cells with the consideration of the controlling group. Our results show that a stable and bioactive HA tliin film is able to form on the surtace of the porous titanium implant by PLD method.This may benefit the fiirther clinical application of TixOs■ implants.     

Combustion behavior and thermal stability of ethylene-vinyl acetate composites based on CaCO3-containing oil sludge and carbon black

CaCO₃-containing oil sludge (OS) is a by-product from petroleum industry, with great amount of production. Therefore, an effective processing methods for CaCO₃-containing OS is urgently needed. Herein, ethylene-vinyl acetate (EVA) composites based on CaCO₃-containing OS and carbon black (CB) were prepared by melt blending method. The combustion behavior and thermal stability of flame-retardant EVA/OS/CB composites were investigated by cone calorimeter test, limiting oxygen index (LOI), scanning electron microscopy (SEM), smoke density test (SDT), and thermogravimetry-Fourier infrared spectrometry. The heat release rate and smoke production rate of the ternary composites containing 3% CB significantly decreased compared with the EVA/OS composites and pure EVA. Moreover, addition of a certain amount of CB could evidently increase LOI values. The morphologies and structures of the residues, revealed by SEM, ascertained that a better carbonaceous protective layer was formed on the ternary composites than the EVA/OS composite. It was obtained from SDT that CB in the material could retard the smoke production with the application of the pilot flame. The EVA/OS/CB composites assumed a higher thermal stability than the EVA/OS composites and pure EVA.

     

Synergistic effects of mono-component intumescent flame retardant grafted with carbon black on flame retardancy and smoke suppression properties of epoxy resins

Journal of Thermal Analysis and Calorimetry - A mono-component intumescent flame retardant named pentaerythritol phosphate melamine salt (PPMS) was grafted on the surface of carbon black (CB) to...