Abstract
We are here reporting the surface modification of magnetite nanoparticle (MNP) with amphiphilic steric stabilizer of polydimethylsiloxane (PDMS) and poly(poly(ethylene glycol) methacrylate) (PPEGMA). The main purpose of this work is to obtain the polymeric bilayer surfactant of hydrophobic PDMS inner shell and hydrophilic PPEGMA brush corona on MNP core. Functionalized PDMS was first synthesized and then covalently grafted on the functionalized MNP surface. The PDMS-coated MNP served as a reactive macroinitiator for atom transfer radical polymerization (ATRP) of PPEGMA. Kinetics studies indicated the constant consumption of PEGMA during first 7 h of the ATRP. Transmission electron microscopy showed the average particle size of 7 nm in diameter. Fourier transform infrared spectrophotometry, thermogravimetric analysis, and vibrating sample magnetometry indicated the increase of the percentage of the copolymer in the complex when the ATRP was prolonged. The decrease in its hydrodynamic size from 446 to 162 nm when the ATRP was extended indicated the improvement in its dispersibility in water. In addition, it was found that percent entrapment efficiency and loading efficiency of indomethacin model drug in the PPEGMA-coated MNP was 62 and 27 %, respectively.
Published Version
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