Xuan Feng

Publications (2)2.6 Total impact

• Article: Preparation and characterization of core-shell structure of SiO2@Cu antibacterial agent.

  Nianchun Zhang, Yanhong Gao, Hui Zhang, Xuan Feng, Huaihong Cai, Yingliang Liu
  [show abstract] [hide abstract]
  ABSTRACT: A simple, low cost and convenient method was used to prepare SiO2@Cu core-shell composite using SiO2 spheres as the core and copper nanoparticles as the shell. A uniform spherical particle of SiO2 was fabricated according to an improved Stöber method. The SiO2 spheres served as a support for the immobilization of copper by reducing Cu2+ in aqueous solution using Fe power. The chemical structures and morphologies of the SiO2 and SiO2@Cu composite were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). E. coli (Escherichia coli), S. aureus (Staphylococcus aureus) and C. albicans (Candida albicans) were utilized to test its antibacterial effect. Results of XRD, TEM and XPS demonstrated that the copper nanoparticles shell supported on the surface of SiO2 spheres. With regard to the antibacterial effect, E. coli was more easily killed than S. aureus and C. albicans after 24 h incubation, and the pictures of TEM showed obviously morphological changes of the antibacterial activity. The results demonstrated that Cu supported on the surface of SiO2 spheres without aggregation, which was proved to be a good novel antibacterial material.
  Colloids and surfaces. B, Biointerfaces 12/2010; 81(2):537-43. · 2.60 Impact Factor
• Article: A simple one-step fabrication of micrometer-scale hierarchical TiO2 hollow spheres

  Xuan Feng, Ling Yang, Yingliang Liu
  [show abstract] [hide abstract]
  ABSTRACT: Hierarchical TiO2 hollow spheres had been prepared based on bubble templates by a simple one-step hydrothermal method. The diameter of hollow spheres was about 700 nm and the shell thickness of them was 69 nm. They were composed of similar spindle- or needle-like building units. Furthermore, hydrothermal time had an important influence on the morphology and crystallinity of hollow spheres. Moreover, the UV–Vis diffuse reflectance spectra of TiO2 hollow spheres heated at 150 °C for 10 h showed the strongest absorption in the UV–Vis region and the Raman spectrum demonstrated the anatase sample. Additionally, a possible formation mechanism of TiO2 hollow spheres was proposed. So this novel and simple method would provide a development direction to fabricate all kinds of inorganic hollow spheres by one-step procedure.
  Materials Letters. 64(24):2688-2691.