Papers by Author: Fei Lu

Abstract: In the present study, we demonstrate that silver colloid can serve as additive and induced the γ-form polymorph of glycine crystals in the netural solution. The silver colloid could quickly affect the packing arrangements of glycine molecules in aqueous solution leading to the competitive nucleation of the two polymorphs.

Abstract: In the present article, we obtained uniform and rather flat melanin films with the dendrites structure using self-assembly technique on Si substrate. The structure of film was confirmed by Fourier-transformed infrared spectrometry (FTIR), X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). Experimental results showed that the grown on the Si substrate, self-assembly film had oriented quality. Furthermore, according to the results, a model of the secondary structure in the melanin films was also proposed.

Abstract: The organic–inorganic hybrid catalyst [(CH2)5NH2]4SiW12O40 was prepared by matrix acid and piperidine. The matrix acid was synthesized by sodium molybdate and sodium silicate, and the piperidine was organic ligand. The proposed composition and structure of the catalyst were evidenced by XPS, FT-IR, XRD, TG-DTA and elemental analysis. The results indicated that the heteropoly anions still reserved their Keggin structure in the compound. Its catalytic performance was evaluated in the oxidation of benzaldehyde to benzoic acid. Various reaction parameters were changed to attain the optimal conditions. The optimal reaction conditions were found to be: n(catalyst): n(benzaldehyde)=3.1×10-3:1; n(H2O2)： n(benzaldehyde)=4.5：1; reaction temperature was 80°C; reaction time was 4h. The yield of benzoic acid achieved above 85%.