Precipitation of Zinc Oxide Nanoparticles in Bicontinuous Microemulsions

Abstract

Zinc oxide nanoparticles were obtained directly, avoiding the calcination step, by precipitation at 70°C in bicontinuous microemulsions stabilized with a mixture of surfactants sodium bis (2-ethylhexyl) sulfosuccinate/sodium dodecyl sulfate (2/1, wt./wt.) containing 0.7 M zinc nitrate aqueous solution. Two concentrations of aqueous solution of precipitating agent sodium hydroxide were used under different dosing times on microemulsion. Characterization by X-ray diffraction and electron microscopy allowed us to identify particles with an acicular rod-like morphology and a hexagonalwurtzitecrystal structure as small as 8.5 and 30 nm in average diameter and length, respectively. Productivities much higher than those typical in the preparation of zinc oxide nanoparticles via reverse microemulsions were obtained. Particle size was the same at the two studied sodium hydroxide concentrations, while it increases as dosing time of the precipitant agent increases. It is believed that the surfactant film on the microemulsion channels restricts the particle diameter growth.

One‐Step Synthesis of Metal Oxide Nanoparticles Using Cannabidiol: Characterisation and Cytotoxicity Assessment in Human Keratinocyte Cells

“…The subsequent addition of NaOH to the reaction mixture resulted in a white precipitate, which indicated the formation of ZnO (the intermediate zinc hydroxide was converted to ZnO during calcination. [45] A colour change accompanied by precipitation was observed during the synthesis of FeO-PVP NPs. A deep red precipitate was obtained when NaOH was added.…”

Cobalt(II) and Zinc(II) Complexes of Hexamethylenetetramine as Single Source Precursors for their Metal Oxide Nanoparticles

“…Various methods have been employed for the morphology-controlled synthesis of Co 3 O 4 and ZnO nanoparticles, which include microwave-assisted synthesis (Faisal et al, 2012;Vijayakumar et al, 2013), Chemical precipitation (Greene, Yuhas, Law, Zitoun, & Yang, 2006;Romo et al, 2011;Rui et al, 2013), hydrothermal (Dakhlaoui, Jendoubi, Smiri, Kanaev, & Jouini, 2009;Lester et al, 2012;Moro et al, 2013;Pál et al, 2012;Rui et al, 2013), sonochemical (Banerjee, Chakrabarti, Maitra, & Dutta, 2012), solvothermal synthesis (Y. Xu, Wang, Sun, Zhang, & Gao, 2010), pulsed layer deposition (Warang et al, 2012), and biosynthesis (Fu & Fu, 2015).…”

“…Xu, Wang, Sun, Zhang, & Gao, 2010), pulsed layer deposition (Warang et al, 2012), and biosynthesis (Fu & Fu, 2015). These varied methods have led to nanoparticles with diverse morphologies like nanocubes (Lester et al, 2012), nanorods (Fu & Fu, 2015;Romo et al, 2011), nanospheres (Dakhlaoui et al, 2009;Darezereshki, Alizadeh, Bakhtiari, Schaffie, & Ranjbar, 2011;Hirai & Asada, 2005), nanowires (Greene et al, 2006), nanoflowers (Pál et al, 2012), and nanotubes (Li, Dou, & Bao, 2012).…”

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