Dynamical study of ZnO nanocrystal and Zn-HDS layered basic zinc acetate formation from sol-gel route
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
20/05/2014
20/05/2014
01/03/2007
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Resumo |
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. |
Formato |
3253-3258 |
Identificador |
http://dx.doi.org/10.1021/jp0662909 Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 111, n. 8, p. 3253-3258, 2007. 1932-7447 http://hdl.handle.net/11449/34120 10.1021/jp0662909 WOS:000245005900009 |
Idioma(s) |
eng |
Publicador |
Amer Chemical Soc |
Relação |
Journal of Physical Chemistry C |
Direitos |
closedAccess |
Tipo |
info:eu-repo/semantics/article |