Dynamical study of ZnO nanocrystal and Zn-HDS layered basic zinc acetate formation from sol-gel route
Dynamical study of ZnO nanocrystal and Zn-HDS layered basic zinc acetate formation from sol-gel route
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DOI：
10.1021/jp0662909
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发表时间：
2007-03-01
影响因子：
3.7
通讯作者：
Santilli, C. V.
中科院分区：
文献类型：
--
作者：
Briois, V.;Giorgetti, Ch.;Santilli, C. V.
我们已经指出，从乙酸锌衍生物（羟基乙酸锌，Zn 4 O（Ac）（6））的乙醇溶液获得的锌基颗粒是纳米尺寸的ZnO、羟基乙酸锌和氢氧化锌复盐（Zn-HDS）的混合物。知识的机制参与的ZnO和Zn-HDS相的形成，和Zn物种在反应介质中的演变进行了监测原位在14小时内，通过同时测量的紫外-可见吸收和扩展X射线吸收精细结构（EXAFS）光谱。在加入乙醇氢氧化锂溶液（[LiOH]/[Zn] = 0. 1)加入到保持在受控温度（40 ℃）下的反应介质中。该研究指出了ZnO纳米颗粒与未反应的羟基乙酸锌之间反应形成Zn-HDS相的第一个直接证据。ZnO的溶解和Zn-HDS的再沉淀是由主要由乙醇酯化产生的水的逐渐释放引起的，气相色谱-质谱联用和FT-IR测量充分证明了这一点。
We have pointed out that zinc based particles obtained from ethanolic solution of a zinc acetate derivative (zinc oxy-acetate, Zn4O(Ac)(6)) are a mixture of nanometer sized ZnO, zinc oxy-acetate, and zinc hydroxide double salt (Zn-HDS). The knowledge of the mechanisms involved in the formation of ZnO and Zn-HDS phases, and the evolution of Zn species in reaction medium was monitored in situ during 14 h by simultaneous measurements of UV-vis absorption and extended X-ray absorption fine structures (EXAFS) spectra. This spectroscopic monitoring was initialized just after the addition of an ethanolic lithium hydroxide solution ([LiOH]/[Zn] = 0. 1) to the reaction medium kept under controlled temperature (40 degrees C). This study points out the first direct evidence of the reaction between ZnO nanoparticles and unreacted zinc oxy-acetate to form a Zn-HDS phase. The dissolution of ZnO and the reprecipitation of Zn-HDS are induced by the gradual release of water mainly produced by ethanol esterification well evidenced by gas chromatography coupled to mass spectroscopy and FT-IR measurements.