The relationship between ζ-potential and surface defects of micro-nano sized hexagram-like α-Al₂O₃ particles was investigated in this paper. The 2D α-Al₂O₃ particles was prepared by the phase transformation of gibbsite precursor by the following steps during calcination in air: Al(OH)₃ → AlOOH→a-Al₂O₃ → θ-Al₂O₃ → α-Al₂O₃. Resulting from the varied intensities of surface defects, as-prepared α-Al₂O₃ samples have different E_g values around 4.5 eV, which is much narrower than that of bulk α-Al₂O₃. While benefiting from the interface reaction between surface > AlOH⁰ and water (>AlOH⁰ + OH⁻⇋ > AlO⁻ + H₂O), as-prepared α-Al₂O₃ suspensions can reach their specific pH_E values after stirring for 8 h at room temperature. And the measured IEP values of Al₂O₃-1250°C-2 h, Al₂O₃-1250°C-3 h, and Al₂O₃–1300 °C-3 h, which remain 2D morphology, are 7.96, 8.67, and 8.86, respectively. This study is significant and useful for making the industrial applications of α-Al₂O₃ valid.

微纳米尺寸六芒星形的α-Al的ζ电位和表面缺陷之间的关系_2个ö ₃颗粒在本文中进行了研究。二维的α-Al _2个ö ₃颗粒在空气中煅烧期间制备通过以下步骤三水铝石前体的相变：AL（OH）₃  →AlOOH的→一个-Al系₂ ö ₃  →θ-Al系₂ ö ₃  →α -Al ₂ O ₃。从表面缺陷的改变的强度得到的，如此制备的α-Al _2个ö ₃样品具有不同ë_克周围4.5电子伏特，这比散装的α-Al的窄得多的值₂ ö ₃。同时还可受益于> AlOH表面之间的界面反应⁰和水（> AlOH ⁰  + OH ^- ⇋>的AlO ^-  + H ₂ O），如此制备的α-Al _2和ö ₃悬浮液可以达到它们特定的pH _Ë搅拌后的值在室温下8小时。并且测得的Al ₂ O ₃ -1250°C-2 h，Al ₂ O ₃ -1250°C-3 h和Al ₂ O _3的IEP值–1300°C-3 h仍为2D形态，分别为7.96、8.67和8.86。该研究是制作的α-Al系的工业应用显著和有用₂ ö ₃有效。