Crystal structures and magnetic properties of polyethylene glycol/polyacrylamide encapsulated CoCuFe 4 O 8 ferrite nanop

  • PDF / 4,068,402 Bytes
  • 10 Pages / 595.276 x 790.866 pts Page_size
  • 46 Downloads / 212 Views

DOWNLOAD

REPORT


Crystal structures and magnetic properties of polyethylene glycol/ polyacrylamide encapsulated ­CoCuFe4O8 ferrite nanoparticles Ebtesam E. Ateia1   · Amira T. Mohamed1 · Mahmoud Maged1 · Ahmed Abdelazim1 Received: 25 May 2020 / Accepted: 22 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract Polymer-inorganic nanocomposites with systematized structure provide a novel composite material having complementary between the polymer and inorganic materials. A new C ­ oCuFe4O8 spinel ferrite was prepared by a modified citrate auto combustion technique. The formation of the core–shell structure by coating ­CoCuFe4O8 nanoparticles (NPs) with Polyethylene glycol (PEG) or Polyacrylamide (PAM) was successfully proceeding. The X-ray diffraction analysis shows that the prepared sample crystallizes in a cubic crystal structure with the Fd3m space group. The structural changes are elucidated via diametrical size, lattice parameter, dislocation density and strain. The obtained data reveals that after coating with PEG/ PAM the crystallite size of ­CoCuFe4O8 spinel ferrite nanoparticles decreases while, the dislocation density increases. The dislocation density provides more energy-friendly locations for nucleation, consequently, the crystallinity deteriorates and the crystal grains become finer. High-Resolution Transmission Electron Microscopy (HRTEM) images ratify that the spinel nanoparticles are embedded in the PEG/PAM matrix forming the core–shell structure. The measurements of the magnetic hysteresis loops assure that all prepared samples exhibit a hard ferrite nature with a coercivity ranging from 1525 to 1512 Oe. The decrease of the magnetic parameters of ­CoCuFe4O8/PEG-PAM can be explained on the basis of the contribution of the non-magnetic coating layer to the total magnetization. The total magnetic behavior of the nanocomposites can be tuned and tailored depending on the coating layers. Based on the obtained data, the formulated ­CoCuFe4O8 decorated with PEG-PAM can be recognized as a promising functional material for applications in biomedicine. The enhanced magnetic properties make ­CoCuFe4O8/PEG-PAM a fitting candidate in the high-density recording. Keywords  Polyethylene glycol · Nanocomposite · Core–shell · Citrate auto combustion · Dislocation density · Magnetic entropy

1 Introduction Nowadays, the invention of new materials with enhanced properties and novel synthesis techniques is becomimg a challenge for material scientists seeking to fulfill recent technological demands. According to the literature [1–3], spinel ferrite nanoparticles are in the spotlight of current nanoscience due to immense potential applications. Among spinel ferrites, ­CoFe2O4 and C ­ uFe2O4 are attractive materials for numerous applications. Cobalt ferrite has an inverse spinel ferrite structure with collinear ferromagnetic properties. It is of extreme * Ebtesam E. Ateia [email protected] 1



Physics Department, Faculty of Science, Cairo University, Giza, Egypt

prominence owing to its unique properties.

Data Loading...