N,N-二(2-氨基乙基)-N-(2-硝基苄基)胺三盐酸盐的合成、表征及应用

以二乙烯三胺HN（CH2CH2NH2）2与邻硝基甲苯为原料,通过溴代、水杨醛保护、亲核取代、脱保护基成盐等多步反应,成功地制备了N,N－二（2－氨基乙基）－N－（2－硝基苄基）胺三盐酸盐。并将其应用于柔性功能臂席夫碱大环配合物的合成上,制取了一系列过渡金属的大环配合物,它们的结构通过FTIR、元素分析等进行了表征。     

酸碱改性对纳米TiO_2光催化性能的影响

用醋酸及氢氧化钠对热分解法所得纳米ＴｉＯ２进行改性,并用１１００型紫外分光光度计对改性前与改性后的纳米ＴｉＯ２的光催化性能进行比较,讨论了酸碱改性对纳米ＴｉＯ２光催化性能的影响。     

纳米无机粒子在塑料高性能化改性中的应用

综述了纳米无机粒子在塑料高韧性、高强度、高断裂伸长率、高耐热、高介电性及抗菌性、导电性、阻燃性、耐磨性等改性方面的应用进展。总结并讨论了纳米无机粒子的表面改性及分散处理对纳米无机粒子塑料复合材料性能的影响。     

含Co介孔分子筛的合成与稳定性研究

两步法进行含Co介孔分子筛的合成,采用XRD,FT-IR,TPR,TEM,N2吸附-脱附等方法对样品的物化性能进行表征结果表明:合成出了具有介孔结构的CoMCM-41,550℃焙烧可以将模板剂有效去除并不影响介孔结构,CoMCM-41的比表面积大于700m2/g,孔径分布在3.4～4.5 nm范围内.650℃热处理3 h或100℃水热处理5 d后CoMCM-41的比表面、孔径和孔体积变化较小,表明CoMCM-41的热稳定性和水热稳定性较好.     

Synthesis of rod-like ultrafine K_4Ce_2Nb_(10)O_(30) via a salt-assistant stearic acid method

A salt-assistant stearic acid method (SAM) capable of forming ultrafine K4Ce2Nb10O30 products was described. XRD pattern re-vealed that tetragonal K4Ce2Nb10O30 products could be obtained by heat treatment at 900 ℃ for 2 h. Transmission electron microscopy (TEM) observations indicated the introduction of KCl could lead to the formation of rod-like K4Ce2Nb10O30 products. The species of salts played a crucial role in fine tuning the shapes and sizes of K4Ce2Nb10O30 products. Furthermore, the K4Ce2Nb10O30 prepa...     

Gelatin-assisted porous expansion of mesoporous silica

In this study, we report the pore expansion effect of gelatin, a common amphoteric biological protein, on the hexagonal mesoporous silica materials. Tetraethyl orthosilicate (TEOS) was used as silica source and the nonionic surfactant P123 (EO₂₀PO₇₀EO₂₀) as template. The microstructure characters of products were investigated by low-angle X-ray diffraction (LAXRD), transmission electron microscope (TEM), and N₂ adsorption–desorption measurements. The results show that the products prepared with gelatin have the mild expansion ratios of 29–39% and 5–22% in pore diameter and pore volume, respectively. The specific surface area of products ranges from 445 to 590 m² g⁻¹. Moreover, it is revealed that the presence of gelatin did not change the intact 2D-hexagonal mesoporous structure of materials. The ultraviolet–visible absorption spectroscopy (UV–Vis) analysis indicates that there is an interaction between the oxygen atoms of P123 and gelatin molecules. The pore expansion may be because the gelatin can interact with the hydrophilic sides of P123 micelles via hydrogen bonds interaction, which is different from the reported pore expansion mechanisms for other systems.     

X 射线透射技术分选铀矿石试验研究

X 射线透射分选技术是利用 X 射线照射不同物料后,不同物料对 X 射线的穿透能力不同进行分选的方 法。 铀矿石浸出之前利用 X 射线透射技术将不含铀或含微量铀的废石分选出来,是降低硬岩铀矿生产成本的有效方 法。 邹家山铀矿石采矿贫化率高、铀矿物在矿石中分布不均匀、适合入选的矿石产率高,有利于采用 X 射线透射技术 分选。 针对邹家山铀矿石利用 XNDT-104 型分选机开展了分选试验研究,考察了分级入选、全粒级入选、不同分选产 率条件下铀矿石的分选效果,试验结果表明:尾矿实际产率和尾矿理论产率基本吻合,说明了 X 射线透射分选机的可 靠性较好,可以根据需要准确控制尾矿产率,当设定尾矿理论产率 35%时,实际尾矿作业产率为 35. 67%,尾矿中铀品 位 0. 018%,铀分布率 3. 51%;相对于原矿低品位矿石产率 29. 68%,铀分布率为 2. 48%。 低品位矿石中铀的品位低于 铀矿山的浸出渣中铀的品位,可以直接抛尾。 X 射线透射分选技术用于硬岩铀矿石预先抛尾是可行的,有利于铀矿山 企业降本增效。     

Preparation of TiO2/polyaniline nanocomposite from a lyotropic liquid crystalline solution

Nanocomposites with two-dimensional (2D) lamellar polyaniline (PANI) as the matrix and TiO₂ as the disperse phase have been prepared in a single step from discotic nematic lyotropic liquid crystal (LLC) solutions as composed by sodium dodecyl sulfate (SDS). Our experiment suggests that, upon loading inorganic species, the crystallinity along the perpendicular direction of PANI chains is improved; the overall morphology is nearly unchanged except the distribution of the interlamellar distances becomes much wider. Finally the thermogravimetric measurement suggests that approximately as high as 36.3% (weight%) of TiO₂ can be introduced into the polymer matrix.     

纳米二氧化钛的制备,表征及应用

综述了纳米二氧化钛的制备方法及结构表征的基本概况，并介绍了１０ 年来纳米二氧化钛的应用研究发展动态