Influence of pH values on different zirconia systems

doi:10.3969/j.issn.2095-4344.2017.26.006

Abstract

Abstract:

BACKGROUND: There are many studies on the effect of different experimental parameters on the tetragonal phase of zirconia, but it is unclear whether pH values have effects on the tetragonal phase in hydrothermal reaction

OBJECTIVE: To prepare two zirconia systems via hydrothermal method and to regulate the tetragonal phase purity and control the grain size of zirconia (ZrO₂) crystal by pH values.

METHODS: Analytical reagents Zr(NO₃)₄•5H₂O and Y(NO₃)₃•6H₂O were adopted as reactors, and nano-sized neat ZrO₂and yttria-stabilized tetragonal ZrO₂ polycrystal (Y-TZP) powders were synthesized using the hydrothermal method. X-ray diffraction was adopted to characterize the influence of pH values and pH regulators (NaOH solution and ammonium hydroxide/NaOH solution) on phase purity and grain size of tetragonal zirconia.

RESULTS AND CONCLUSION: Pure zirconia samples with a grain size lower than 20 nm were obtained through the hydrothermal method, and samples with higher tetragonal phase content compared to monoclinic phase could be derived when the pH value was higher than 10. The optimal pH values for neat zirconia and Y-TZP were 13 and 12, respectively. Furthermore, the ammonium hydroxide/NaOH solution was more favorable to enhance the content of tetragonal zircona. Therefore, the control of pH values and rational choice of pH regulators can improve the tetragonal phase purity and grain size of zirconia.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Dental Material, Dental Prosthesis, Tissue Engineering

CLC Number:

R318

Ji Yang, Han Li-zi, Zheng Wei-qi, Wang Qiang, Yang Hua-zhe.

Influence of pH values on different zirconia systems

[J]. Chinese Journal of Tissue Engineering Research, 2017, 21(26): 4131-4136.

Figures/Tables 4

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