No abstract

A facile electrochemical approach was developed for controllable synthesis of ytterbium hexacyanoferrate(II) (YbHCF(II)) carambolalike microparticles. The prepared samples were characterized by XRD, EDS and SEM techniques. The composition of YbHCF(II) sample could be assigned to be KYb[Fe(CN)6]∙xH2O. By controlling the synthetic conditions, such as applied potential and deposition time, the size and surface morphology of the synthesized materials could be well controlled. The modified Au electrode by YbHCF(II) carambolalike microparticles possesses prominent electrocatalytic activity toward the reduction of hydrogen peroxide.

To produce and evaluate sustained microcapsules of insulin made by a novel encapsulation process. The insulin was encapsulated into microcapsules of poly(D, L-lactide co-glycolide) (PLGA) by the high voltage field method. The preparation process was cryogenic, non-aqueous, and did not utilize emulsification. When the ratio of insulin/PLGA was 1:9, the median particle size of insulin microcapsules was less than 200μm, the drug loaded was 8.82%, and the efficiency of encapsulation was 83.2%. Drug release continued over 300h. In conclusion, the process was a novel way to produce insulin microcapsules, and the basic characteristics were satisfactory.

A natural mineral, palygorskite clay, was used to synthesize pure zeolite X via a two-stage method. The synthetic parameters, such as calcination, crystallization time, and SiO2/Al2O3molar ratio, were investigated. The results indicated that calcination enhanced the extraction of silica from palygorskite clay and was beneficial for the formation of zeolite X. Micro-sized pure zeolite X with the particle size of 1-4 μm was obtained in the gel with the SiO2/Al2O3molar ratio range of 1.93 to 3 after hydrothermal treatment at 80 °C for 5 h. The synthetic zeolite X showed high specific surface area (487 m2/g) and low Si/Al ratio (1.17).

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