4.7 Article

Ultrasound induced strain in ultrasmall CoFe2O4@polyvinyl alcohol nanocomposites

期刊

ULTRASONICS SONOCHEMISTRY
卷 40, 期 -, 页码 583-586

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ELSEVIER
DOI: 10.1016/j.ultsonch.2017.07.050

关键词

Polyvinyl alcohol; Cobalt ferrite; Ultrasound irradiation; XRD; Co-precipitation method

资金

  1. University of Mohaghegh Ardabili
  2. Guilan University

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Cobalt ferrite/Polyvinyl alcohol (PVA) nanocomposites were prepared with and without ultrasonic treatment by co-precipitation technique, characterized by X-ray diffraction (XRD), Vibrating sample magnetometer (VSM), Fourier transform infrared spectroscopy (FT-IR) and Transmission Electron Microscopy (TEM). The obtained results revealed that ultrasound irradiation induces strain in the structure and increases the magnetic anisotropy energy of the 7 nm magnetic nanoparticles (MNPs). The diffraction peak broadening and shift to lower angle due to the lattice strain were analyzed by means of Williamson-Hall (W-H) method. TEM images also show that ultrasound irradiated sample contain nano-crystallite cobalt ferrite which have completely dispersed and embedded in PVA matrix. These ultrasmall MNPs whit nonzero coercivity are promising for high density data storage devices.

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