The parallel flow drop solvothermal method was utilized to synthesize the crystal of MOF-5 by taking the molar ratio of the metal ions to the organic ligands of 2:1 at 140 ^∘ C, and the reaction time at 12 hours. Meanwhile, the structure and properties of MOF-5 were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA) and fourier transform infrared spectroscopy (FTIR). SEM analysis shown that the crystal morphology of MOF-5 changed from sheet to cubic with increasing reaction temperature and molar ratio of the metal ions to the organic ligands, and its thermal stability was also gradually increased. TGA analysis shown that its thermal stability could live up to 489.36 ^∘ C. FTIR analysis shown that the terephthalic acid is completely protonated, and the Zn ²⁺ and the carboxyl group are formed by the coordination of the multi-tooth bridge in the crystal of MOF-5. Then the structure activity relationship of the crystal MOF-5 synthesis, microstructural, thermal stability and N ₂ adsorption property were further studied.

In this study, the thermal stability and CO₂ adsorption property of ZIF-8 were effectively improved by using parallel flow-drop solvothermal method. -NH₂ was successfully introduced into the surface of ZIF-8 and their structures by pre-modification with polyaniline. XRD analysis shown that the intensity of ZIF-8 characteristic peak increased with the increase doped content of polyaniline, but the crystal structure of ZIF-8 remained unchanged. FTIR analysis shown that the two new peaks at 1609 and 690 cm⁻¹ can be attributed to the -NH₂ bonding of ZIF-8. TGA analysis shown that the thermal stability of NH₂-ZIF-8 was 632.71 °C. SEM analysis shown that the increase of CO₂ adsorption property was due to the increase of NH₂-ZIF-8 cubic crystal system. It was found that BET surface area was 789.7 m²g⁻¹, micropore volume was 0.55 cm³g⁻¹, pore size was 0.99 nm by taking the molar ratio of metal ions to ligands being 1:2, and the molar ratios of polyaniline to metal ions being 12%.

In this research, lanthanum was doped into the framework of MOF-5 to stabilize the spatial structure and to improve its performance. La(NO₃)₃·6H₂O, Zn(NO₃)₂·6H₂O and terephthalic acid were used to form La-MOF-5 by an innovative parallel flow-drop solvothermal method. The structure and properties of La-MOF-5 were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetry analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The relationship between microstructure stability and macroscopic properties are illustrated. The results show that the doped lanthanum is beneficial to improve the thermal stability and CO₂ adsorption property of MOF-5 because of the improvement of microstructure. On the other hand, the introduction of lanthanum to MOF-5 is beneficial to form porous frameworks and to raise the thermal stability and CO₂ adsorption property. The crystallinity, structure, morphology and thermal stability of La-MOF-5 are best at the La-content 2.5 atom%.

Micro-arc oxidation was applied to AZ91D magnesium alloy by taking K₂Cr₂O₇ as the colouring salt in the silicate system. It was shown that the green coating obtained through performing micro-arc oxidation on magnesium alloy consisted of Mg, Mg₂SiO₄, MgO, and MgCr₂O₄ based on analysis of X-ray diffraction (XRD), and scanning electron microscopy (SEM). Among which, MgCr₂O₄ was the colouring salt; there were something in the lamellar, pit, and convex forms found on the surface of the coating. The coating consisted of a porous, and a compact, layer from the outside to the inside. As demonstrated, the colour of the coating depended on the K₂Cr₂O₇ concentration: it became gradually deeper with the addition of K₂Cr₂O₇ and the increasing micro-arc oxidation time. The corrosion resistance and hardness of the green coating were greater than that of the matrix.