4.7 Article

Recyclable Antibacterial Magnetic Nanoparticles Grafted with Quaternized Poly(2-(dimethylamino)ethyl methacrylate) Brushes

Journal

BIOMACROMOLECULES
Volume 12, Issue 4, Pages 1305-1311

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/bm200031v

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Funding

  1. NSF [DMR 09-69301]
  2. Direct For Mathematical & Physical Scien
  3. Division Of Materials Research [969301] Funding Source: National Science Foundation

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Highly efficient recyclable antibacterial magnetite nanoparticles consisting of a magnetic Fe3O4 core with an antibacterial poly(quaternary ammonium) (PQA) coating were prepared in an efficient four-step process. The synthetic pathway included: (1) preparation. of Fe3O4 nanoparticles via coprecipitation of Fe2+/Fe3+ in the presence of an alkaline solution; (2) attachment of an ATRP initiating functionality to the surface of the nanoparticles; (3) surface-initiated atom transfer radical polymerization (ATRP) of 2(dimethylamino)ethyl methacrylate (DMAEMA); and (4) transformation of PDMAEMA brushes to PQA via quaternization with ethyl bromide. The success of the surface functionalization was confirmed by FT-IR, thermal gravimetric analysis (TGA), elemental analysis, and transmission electron microscopy (TEM). The PQA-modified magnetite nanoparticles were dispersed in water and exhibited a response to an external magnetic field, making the nanoparticles easy to remove from water after antibacterial tests. The PQA-modified magnetite nanoparticles retained 100% biocidal efficiency against E. coli (10(5) to 10(6) E. coli/mg nanoparticles) during eight exposure/collect/recycle procedures without washing with any solvents or Water.

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