Lanthanum hydroxide nanorods with a diameter of 10-20 nm and length up to 100-200 nm were synthesized through a direct reaction of La(NO3)3 and KOH under hydrothermal microemulsion conditions.X-ray diffraction（XRD） ...Lanthanum hydroxide nanorods with a diameter of 10-20 nm and length up to 100-200 nm were synthesized through a direct reaction of La(NO3)3 and KOH under hydrothermal microemulsion conditions.X-ray diffraction（XRD） and scanning electron microscope（SEM） were employed for the characterization of the structure,compositions and morphology of the obtained products.The results showed that the molar ratio of water to the surfactant CTAB,concentration of La(NO3)3,reactant temperature and reactant time all could affect the morphology and size of the lanthanum hydroxide nanorods.展开更多
早在1888年Traumarn就提出了4-(2-噻唑偶氮)-间苯二酚(TAR)和1-(2-噻唑偶氮)-2-萘酚(TAN)等噻唑偶氮化合物,但并未研究它与金属离子的生色性和在分析上的应用.噻唑偶氮类试剂是继吡啶偶氮类试剂之后发展起来的另一类重要的有前途的显色...早在1888年Traumarn就提出了4-(2-噻唑偶氮)-间苯二酚(TAR)和1-(2-噻唑偶氮)-2-萘酚(TAN)等噻唑偶氮化合物,但并未研究它与金属离子的生色性和在分析上的应用.噻唑偶氮类试剂是继吡啶偶氮类试剂之后发展起来的另一类重要的有前途的显色剂.此类试剂中的基本分析功能团是:由于其中电负性大的氮、氧等原子共同存在并同时参与金属螯合物的形成,从而增强了邻羟基偶氮酚与金属离子的生色作用,提高了显色反应的灵敏度.此类试剂在分析化学中的应用已见诸报道.自Savvin S B于1970年首次合成2-(2-4,展开更多
文摘Lanthanum hydroxide nanorods with a diameter of 10-20 nm and length up to 100-200 nm were synthesized through a direct reaction of La(NO3)3 and KOH under hydrothermal microemulsion conditions.X-ray diffraction（XRD） and scanning electron microscope（SEM） were employed for the characterization of the structure,compositions and morphology of the obtained products.The results showed that the molar ratio of water to the surfactant CTAB,concentration of La(NO3)3,reactant temperature and reactant time all could affect the morphology and size of the lanthanum hydroxide nanorods.
文摘早在1888年Traumarn就提出了4-(2-噻唑偶氮)-间苯二酚(TAR)和1-(2-噻唑偶氮)-2-萘酚(TAN)等噻唑偶氮化合物,但并未研究它与金属离子的生色性和在分析上的应用.噻唑偶氮类试剂是继吡啶偶氮类试剂之后发展起来的另一类重要的有前途的显色剂.此类试剂中的基本分析功能团是:由于其中电负性大的氮、氧等原子共同存在并同时参与金属螯合物的形成,从而增强了邻羟基偶氮酚与金属离子的生色作用,提高了显色反应的灵敏度.此类试剂在分析化学中的应用已见诸报道.自Savvin S B于1970年首次合成2-(2-4,
