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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Catalysis and Temperature Dependence on the Formation of ZnO Nanoparticles and of Zinc Acetate Derivatives Prepared by the Sol-Gel Route
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Catalysis and Temperature Dependence on the Formation of ZnO Nanoparticles and of Zinc Acetate Derivatives Prepared by the Sol-Gel Route

机译：溶胶-凝胶法制备的ZnO纳米颗粒和乙酸锌衍生物的催化和温度依赖性

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摘要

The chemical and structural nature of powders prepared from the zinc acetate-derived precursor using the sol-gel route is discussed. The influence of the synthesis temperature and of the hydrolytic catalyst on the structural features of the powder is focused on the basis of X-ray powder diffraction (XRPD) and extended X-ray absorption fine structure (EXAFS) measurements and complemented with density and thermoanalysis (TG-DTA) results. EXAFS and XRPD results show that no-washed nanoparticulate powders are composed of a mixture of ZnO (wurtzite), zinc acetate, and zinc hydroxyacetate. The latter has a layered structure typical of hydroxy double salts (HDS). The main component of no-washed powders is always unreacted zinc acetate solid but the relative amount of the zinc-based compounds depends on the nature of the hydrolytic catalyst, hydrolysis ratio, and of synthesis temperature. According to the proportion of the three zinc-based compounds, three families of powders could be distinguished. The amount of ZnO nanoparticles (1.6 ± 0.6 nm) decreases as the synthesis temperature increases, as the hydrolysis ratio decreases, or by changing from basic to acid catalysis. This finding suggests that the formation of zinc compounds is controlled by the equilibrium between hydrolysis-condensation and complexation-reprecipitation reactions.
机译：讨论了使用溶胶-凝胶法从醋酸锌衍生的前体制备的粉末的化学和结构性质。合成温度和水解催化剂对粉末结构特征的影响集中在X射线粉末衍射（XRPD）和扩展的X射线吸收精细结构（EXAFS）测量的基础上，并辅以密度和热分析（TG-DTA）结果。 EXAFS和XRPD结果表明，未洗涤的纳米颗粒粉末由ZnO（纤锌矿），醋酸锌和羟基醋酸锌的混合物组成。后者具有典型的羟基双盐（HDS）的层状结构。未洗涤粉末的主要成分始终是未反应的乙酸锌固体，但锌基化合物的相对量取决于水解催化剂的性质，水解率和合成温度。根据三种锌基化合物的比例，可以区分出三类粉末。 ZnO纳米粒子的数量（1.6±0.6 nm）随着合成温度的升高，水解率的降低或从碱性催化到酸催化的变化而降低。该发现表明锌化合物的形成受水解-缩合反应和络合-再沉淀反应之间的平衡控制。

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