Dou Zhang
Central South University
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Publication
Featured researches published by Dou Zhang.
CrystEngComm | 2016
Xuefan Zhou; Chao Jiang; Chao Chen; Hang Luo; Kechao Zhou; Dou Zhang
In this study, lead-free sodium bismuth titanate (Na0.5Bi0.5TiO3, NBT) was synthesized using a hydrothermal method with processing temperatures of 100–180 °C and NaOH concentrations of 2–14 M. NBT spherical agglomerates of primary nanocubes, NBT nanowires and NBT microcubes were obtained and their morphologies exhibited a strong correlation with the synthesis conditions. NBT nanowires with a high aspect ratio were proven to be single-crystalline with a [110] growth direction by high-resolution TEM analysis. The in situ transformation process and dissolution–recrystallization mechanism were successfully used to explain the formation of different NBT morphologies. Domain structures and piezoelectric characteristics were systematically studied for NBT by piezoresponse force microscopy (PFM). Clear ferroelectric domain structures and obvious polarization switching behaviors were observed in all types of NBT. The NBT microcubes possessed a larger piezoresponse compared with the NBT spherical agglomerates and nanowires.
Materials Science and Engineering: C | 2016
Qiyao Xiao; Kechao Zhou; Chao Chen; Mingxiang Jiang; Yan Zhang; Hang Luo; Dou Zhang
Microspheres with hollow and/or porous structures have been widely used in various applications. A new method of spraying and freezing emulsions was developed to prepare hollow HA (hydroxyapatite) microspheres with interconnected pores by using PVA (polyvinyl alcohol) as emulsifiers and binders. The relationships between viscosity and shear time or rates were tested and the dispersing stability of oil in water (O/W) emulsions was characterized with comparison to suspensions without the addition of oil phase. The effects of solid loadings of HA and the volume ratio between oil and water on the morphologies of microspheres were investigated. Hollow HA microspheres with particle diameter of ~20μm and pore size of ~0.6μm were successfully obtained by spray freezing method. Besides, drying and sintering processes were crucial to the formation of hollow and porous structures, respectively. The gentamicin loading and releasing of HA porous microspheres with different hollow volumes were tested.
Journal of Materials Chemistry C | 2017
Jingjing Liao; Hehao Chen; Hang Luo; Xiaofeng Wang; Kechao Zhou; Dou Zhang
Tailoring the rheological properties of colloidal inks is critical for the direct ink writing of three-dimensional structures. The rheological properties of zirconia colloidal inks are extremely sensitive to the concentration of ammonium polyacrylate (NH4PAA). The colloidal ink containing 47 vol% ZrO2, 0.005 g ml−1 cellulose and 0.8 wt% NH4PAA dispersant showed a low viscosity of 3 Pa s at a characteristic shear rate of 50 s−1 and maintained an equilibrium elastic modulus of 8 × 104 Pa when the stress amplitude was up to 200 Pa. Three-dimensional structures with a feature size of 200 μm were successfully assembled with fine integrity.
Journal of The European Ceramic Society | 2016
Chao Jiang; Xuefan Zhou; Kechao Zhou; Chao Chen; Hang Luo; Xi Yuan; Dou Zhang
Composites Part A-applied Science and Manufacturing | 2016
Hang Luo; Zhong Wu; Chao Chen; Chao Ma; Kechao Zhou; Dou Zhang
Advanced Materials Interfaces | 2016
Hang Luo; Kechao Zhou; Chris R. Bowen; Fuqiang Zhang; Anqi Wei; Zhong Wu; Chao Chen; Dou Zhang
Materials & Design | 2016
Xiujuan Lin; Shifeng Huang; Kechao Zhou; Dou Zhang
Journal of the American Ceramic Society | 2016
Yuehua Sun; Chaoqun Peng; Xiaofeng Wang; Richu Wang; Yixin Chen; Dou Zhang
Ceramics International | 2016
Xuefan Zhou; Chao Jiang; Hang Luo; Chao Chen; Kechao Zhou; Dou Zhang
Ceramics International | 2017
Chao Jiang; Xuefan Zhou; Kechao Zhou; Mingliang Wu; Dou Zhang