Briois, V.Giorgetti, Ch.Baudelet, F.Blanchandin, S.Tokumoto, M. S.Pulcinelli, Sandra Helena [UNESP]Santilli, Celso Valentim [UNESP]2014-05-202014-05-202007-03-01Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 111, n. 8, p. 3253-3258, 2007.1932-7447http://hdl.handle.net/11449/34120We 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.3253-3258engArtigo10.1021/jp0662909WOS:000245005900009Acesso restrito997120258528696755842986818708650000-0002-8356-8093