Abstract
AbstractSummary: One of the most optically transparent magnetic materials known at room temperature consists of nanocrystalline γ‐Fe2O3 dispersed in a DVB cross‐linked sulfonated polystyrene (PS) matrix. When attrited dry or in water without surfactant and subsequently processed in water or water miscible liquids, the nanocomposite leads to a highly stable, low optical density ferrofluid with unique properties and uses in a variety of applications. We have heretofore identified the stabilizing agent in the ferrofluid as low molecular weight (∼6000) sulfonated PS, which results from attrition of the cross linked polystyrene nanocomposite. We report on the synthesis of low molecular weight (LMW) PS by atom transfer radical polymerization (ATRP) followed by sulfonation with acetyl sulfate and on the one‐step synthesis of a stable ferrofluid of nanocrystalline Fe3O4 using the newly synthesized LMW sulfonated PS. Physicochemical analyses and characterizations include GPC, GC‐MS, GPC, NMR, FTIR, XRD, TEM and magnetic data.
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