Abstract
Diacrylate-terminated polydimethylsiloxane (PDMS) and disiloxane were synthesized and used for controlling degree of nanoclustering of magnetite nanoparticles (MNPs). PDMS was synthesized via a ring-opening polymerization of octamethylcyclotetrasiloxane (D4), followed by end functionalization with diacrylate groups. Diacrylate-terminated disiloxane was separately synthesized in a similar fashion without the use of D4 in the reaction. They were then reacted with amino-coated MNPs to obtain MNP-embedded siloxane nanoclusters. Transmission electron microscopy showed the formation of MNP-siloxane nanoclusters with the size of 70–200 nm. Degree of MNP nanoclustering can be adjusted by varying the MNP-to-siloxane ratio to obtain hydrodynamic size ranging from 200 to 2400 nm. Using the same ratio of MNPs to the siloxanes, PDMS resulted in the nanoclusters with smaller D h and more stable in toluene than those coated with disiloxane. These novel nanoclusters with controllable size might be ideal candidates for biomedical and other advanced applications after suitable surface modification.
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