Pham, Minh-Hao and Vuong, Gia-Thanh and Vu, Anh-Tuan (2011) Novel Route to Size-Controlled Fe_MIL-88B_NH2 Metal_Organic Framework Nanocrystals. Langmuir .
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A new approach for the synthesis of uniform metal_organic framework (MOF) nanocrystals with controlled sizes and aspect ratios has been developed using simultaneously the non-ionic triblock co-polymer F127 and acetic acid as stabilizing and deprotonating agents, respectively. The alkylene oxide segments of the triblock copolymer can coordinate with metal ions and stabilize MOF nuclei in the early stage of the formation of MOF nanocrystals. Acetic acid can control the deprotonation of carboxylic linkers during the synthesis and, thus, enables the control of the rate of nucleation, leading to the tailoring of the size and aspect ratio (length/width) of nanocrystals. Fe_MIL-88B_NH2, as an iron-based MOFcrystal, was selected as a typical example to illustrate our approach. The results reveal that this approach is used for not only the synthesis of uniform nanocrystals but also the control of the size and aspect ratio of the materials. The size and aspect ratio of nanocrystals increase with an increase in the concentration of acetic acid in the synthetic mixture. The non-ionic triblock co-polymer F127 and acetic acid can be easily removed from the Fe_MIL-88B_NH2 nanocrystal products by washing with ethanol, and thus, their amine groups are available for practical applications. The approach is expected to synthesize various nanosized carboxylatebased MOF members, such as MIL-53, MIL-89, MIL-100, and MIL-101.
|Subjects:||Material Science > Nanochemistry|
|Deposited On:||23 May 2012 15:42|
|Last Modified:||23 May 2012 15:42|
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