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Effects of Fluid Flow on the Growth and Assembly of ZnO Nanocrystals in a Continuous Flow Microreactor

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  • Assembly of nanocrystals is considered one of the most promising approaches to design nano-, microstructures, and complex mesoscopic architectures. A variety of strategies to induce nanocrystal assembly have been reported, including directed assembly methods that apply external forces to fabricate assembled structures. In this study ZnO nanocrystals were synthesized in an aqueous solution using a continuous flow microreactor. The growth mechanism and stability of ZnO nanocrystals were studied by varying the pH and flow conditions of the aqueous solution. It was found that convective fluid flow from Dean vortices in a winding microcapillary tube could be used for the assembly of ZnO nanocrystals. The ZnO nanocrystal assemblies formed three-dimensional mesoporous structures of different shapes including a tactoid and a sphere. The assembly results from a competing interaction between electrostatic forces caused by surface charge of nanocrystals and collision of nanocrystals associated with Dean vortices. Dispersion behaviours of the ZnO assembly in some solvents were also studied. MeOH, a strong precipitant, led to the precipitation of the ZnO assembly. This study shows that the external forces from convective fluid flow could be applied to fabricate assembly of functional metal oxides with complex architectures using a continuous flow microreactor.
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  • Choi, C., Su, Y., & Chang, C. (2013). Effects of fluid flow on the growth and assembly of ZnO nanocrystals in a continuous flow microreactor. CrystEngComm, 15(17), 3326-3333. doi:10.1039/c3ce26699k
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  • 15
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  • 17
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  • Funding was provided by US Army Communications-Electronics Research, Development, and Engineering Center (CERDEC) through the Tactical Energy System program W909MY-10-C-0073.
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