Biodegradable polyesteramide copolymer P (CL/AU) based on €-caprolactone and 11-aminoundecanoic acid was synthesized by the melt polycondensation method. Polyesteramide (PEA) microspheres were prepared by a simple O/W emulsion solvent evaporation method. The effects of variations in preparation parameters (such as emulsifier concentration, polymer concentration, polymer solution adding rate, stirring rate, and whether vacuum was applied) were studied in detail. The obtained microsphere morphologies were observed using an optical microscope and via scanning electron microscopy (SEM). The particle size distribution was determined using a Malvern laser particle sizer. When the PEA microspheres were incubated in PBS saline, the particle size increased at first, and then decreased after a longer time period; the theory that this behavior was due to degradation of the microspheres was confirmed by SEM.

A new type of biodegradable polyesteramide P(LA/AU) based on lactic acid and aminoundecanoic acid was synthesized by the melt polycondensation method. The copolymers obtained were characterized by FTIR. 1H-NMR. DSC. and XRD。 The in vitro degradation behavior of the copolymers was strdied using weighing. H-NMR, FTIR. DSC, and SEM. With the increase in aminoundecanoic acid units, the milting temperature and units, the melting temperature and crystallinity increased, but the water absorption and degradation rate decreased accordingly. During degradation in vitro, the ester mority decreased due to ester cleavage along the macromolecular main chain. As degradation proceeded, the melting temperature and crystallinity increased at first, then started to decrease because the crystalline phase was destroyed.

Copper powder is synthesized by hydrothermal treatment using the copper powder obtained from the chemical reduction method as a precursor. The copper powder is also treated in benzotriazole solution. The powder X-ray diffraction patterns and SEM photomicrographs exhibit that the copper powder possesses perfect crystallinity and narrow size distribution. The thermal behavior of the three kinds of copper powder is evaluated by thermogravimetry and derivative thermogravimetry. Comparing with the sample prepared by means of the chemical reduction method, the copper powder treated under hydrothermal condition displays a peak temperature of the formation of Cu2O shifting from 60.49

Sn-doped (Ba, Sr) TiO3 (BSTS) thin films have been deposited on highly (200) oriented LaNiO3 (LNO) thin films by sol-gel method. The atomic force microscope (AFM) images exhibited that the dopant Sn did not decrease the crystalline grain size of BST thin films. The structure of the BST film, determined by X-ray diffraction (XRD), presented the higher intensity (110) and (200) peaks, while the latter was distinctly induced by LNO layer. Evidently, Sn-doped BST thin films on LNO/Si substrate were found to decrease the dielectric constant and the dielectric loss, which is favourable to potentially improve the figures of merits (FD) of pyroelectric materials. The BSTS thin films on LNO layer also displayed an excellent leakage current property comparing with the BST thin film on Pt/Ti/SiO2/Si and LNO/Si substrates.