Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (9): 1955.doi: 10.7503/cjcu20190090

• Physical Chemistry • Previous Articles     Next Articles

Preparation and Quasi-superhydrophobic Properties of the Surface of Mullite Whiskers/Cordierite

DU Yifan1,AI Chaoqian1,ZHANG Yaoyao1,WANG Wei1,2,*()   

  1. 1. Department of Chemical Engineering, College of Environment Science and Engineering
    2. Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas,Ministry of Education, Chang’an University, Xi’an 710054, China;
  • Received:2019-02-01 Online:2019-09-10 Published:2019-09-09
  • Contact: WANG Wei E-mail:wwchem@chd.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(51678059);the Key Research and Development Program of Shaanxi Province, China(2019GY-179);the Fundamental Research Funds for the Central Universities, China(300102298202)

Abstract:

Silicon-aluminum hybrid gel powders were prepared by sol-gel technology, and the microstructure of mullite whiskers/cordierite was obtained through growth of mullite whiskers on the surface of cordierite ceramic substrate by molten salt reaction. X-Ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy were employed to characterized the structural morphology and phase compositions. The results show that the surface of cordierite ceramic was covered by dense mullite whiskers with nanometer-sized(100—300 nm) diameters and micrometer-sized lengths. The surface modification of mullite whiskers was performed by coupling reaction between n-dodecyltrimethoxysilan and numerous active groups(Si—OH, Al—OH) on the surface of mullite whiskers, and static wetting angle of this sample is 146°. Dynamic wetting studies show that mullite whiskers increase the surface roughness of cordierite ceramics, making the hydrophilic mullite whiskers/cordierite surface more hydrophilic and the surface of the mullite whiskers/cordierite modified by the silane coupling agent change into quasi-superhydrophobic surface

Key words: Cordierite ceramics, Mullite whiskers, Wetting angle, Hydrophobicity, Surface roughness

CLC Number: 

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