Much attention has been devoted to well dispersed magnetic colloidal particles owing to their wide potential applications in the fields of ferrofluids, disks and toner in printing, and magnetic resonance imaging (MRI). Heretofore, we have been comprehensively studying on the synthesis and applications on the ABA triblock-type two fluoroalkyl end-capped oligomers [RF-(M)n-RF; RF = fluoroalkyl groups; M = radical polymerizable hydrocarbon monomers. These fluoroalkyl end-capped oligomers can form the nanometer size controlled self-assembled molecular aggregates through the aggregation of terminal fluoroalkyl segments in aqueous and organic media. The fluorinated oligomeric aggregates thus obtained can interact with a variety of inorganic guest molecules such as silica, titanium oxide, hydroxyapatite, gold, silver, copper, palladium, zinc oxide, calcium carbonate, calcium silicide, magnesium carbonate, magnesium oxide, and talc to afford the corresponding fluorinated oligomeric aggregates/guest molecules nanocomposites. In fact, fluoroalkyl end-capped oligomeric nanocomposites - encapsulated gold nanoparticles can provide linear arrays of these fluorinated nanocomposite particles to afford the extremely red-shifted plasmon absorption band at around 960 nm. Thus, it is of particular interest to explore novel fluoroalkyl end-capped oligomeric nanocomposites by using magnetic nanoparticles as the guest molecules from the developmental viewpoints of new fluorinated functional materials. Here we report that fluoroalkyl end-capped vinyltrimethoxysilane oligomer/magnetite nanocomposites can be prepared by the sol-gel reactions of the corresponding oligomer in the presence of magnetic nanoparticles under alkaline conditions. The obtained fluorinated nanocomposites were found to afford a good dispersibility toward the traditional organic media except for water. Transmission electron microscope (TEM) image shows that the magnetic nanoparticles can be effectively encapsulated into the fluoroalkyl end-capped oligomeric nanoparticle cores to provide the expected RF-(VM-SiO2)n-RF/ magnetite nanocomposites. Interestingly, it was demonstrated that these fluorinated nanocomposites can exhibit a superoleophilic/superhydrophobic characteristic on the modified surface and these obtained nanocomposite powders are applicable to the adsorbent for removing oil in water by using the permanent magnet.

Preparation and properties of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/magnetite nanocomposites

2019 Fall National Meeting

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