Monitoring the growth of polyoxomolybdate nanoparticles in suspension by flow field-flow fractionation |
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Authors: | Chen Bailin Jiang Huijian Zhu Yan Cammers Arthur Selegue John P |
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Institution: | Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA. |
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Abstract: | We follow the evolution of polyoxomolybdate nanoparticles in suspensions derived from the keplerate (NH4)42MoVI72MoV60O372(CH3CO2)30(H2O)72].ca..300H2O.ca..10CH3CO2NH4 ({Mo132}) by flow field-flow fractionation (FlFFF) to monitor the particle-size distribution in situ, atomic force and high-resolution transmission electron microscopy (AFM, SEM, and HRTEM) to confirm particle sizes, inductively coupled plasma-optical emission spectrometry (ICP-OES) to determine the Mo content of the FlFFF-separated fractions, and UV/visible spectroscopy to confirm the identity of the species in suspension. We observe the formation of 3-75-nm polyoxomolybdate particles in suspension and the dynamic growth of {Mo132} crystals. |
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