Zinc oxide particles are prepared as a dry powder through a vapor phase formed by a plasma process, or by introducing defects into stoichiometric zinc oxide particles in a liquid carrier through mechanical stress. The zinc oxide has an O:Zn ratio of at least 0.99, an average particle size of 10 to 300 nm, and a sufficient concentration of oxygen vacancies and zinc vacancies to give a dispersion of the particles in C12-C15 alkyl benzoate an orange to tan color corresponding to a ΔE value of at least 15 in a Dispersion Color Test. The particles contain no aggregates and have no detectable particles 500 nm or larger, on a number-weighted basis
氧化锌颗粒是通过等离子工艺形成的气相制备成干粉,或通过机械应力将缺陷引入液体载体中的定量
氧化锌颗粒。
氧化锌的 O:Zn 比率至少为 0.99,平均粒径为 10 至 300 纳米,氧空位和
锌空位的浓度足以使颗粒在 C12-C15 烷基
苯甲酸盐中的分散体呈现橙色至棕褐色,对应于分散体颜色测试中至少 15 的 ΔE 值。颗粒不含聚集体,按数量加权计算,没有可检测到的 500 nm 或更大的颗粒。