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Enhancement of X-ray Shielding Properties of PVDF/BaSO4 Nanocomposites Filled with Graphene Oxide

Published online by Cambridge University Press:  02 January 2019

Liliane A. Silva ,
Adriana M. S. Batista ,
Tiago Serodre ,
Annibal T. B. Neto ,
Clascidia A. Furtado  and
Luiz O. Faria
Liliane A. Silva
Affiliation:
Depto. Engenharia Nuclear – UFMG, Av. Antônio Carlos, 6627, CEP 31270-970, Belo Horizonte, MG, Brazil
Adriana M. S. Batista
Affiliation:
Depto. Anatomia e Imagem, Faculdade de Medicina – UFMG, Av. Prof. Alfredo Balena, 190, CEP 30130-100, Belo Horizonte, MG, Brazil
Tiago Serodre
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, Av. Antonio Carlos 6627, CEP 31270-901, Belo Horizonte-MG, Brazil
Annibal T. B. Neto
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, Av. Antonio Carlos 6627, CEP 31270-901, Belo Horizonte-MG, Brazil
Clascidia A. Furtado
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, Av. Antonio Carlos 6627, CEP 31270-901, Belo Horizonte-MG, Brazil
Luiz O. Faria*
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, Av. Antonio Carlos 6627, CEP 31270-901, Belo Horizonte-MG, Brazil
*
*(Email: farialo@cdtn.br)
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Abstract

In this work, we report evidences of the improvement of X-ray attenuation efficiency by the addition of a very small amount of Graphene Oxide (GO) in polymer-based nanocomposite. Poly(vinylidene fluoride) (PVDF) homopolymer and barium sulfate (BaSO4) nanoparticles were mixed. PVDF/BaSO4 nanocomposite was found to attenuate 9.14% of a 20 kV X-ray beam. The addition of only 4.0 wt % of GO nanosheets to the nanocomposite improved this X-Ray attenuation efficiency to 24.56%. The respective linear attenuation coefficients (μ) were 39.9 cm-1 and 54.4 cm-1, respectively. The X-ray attenuation gradually decreases until 6.71% and 17.62%, respectively, for the X-ray beam with higher energy (100 kV). Fourier transform infrared data revealed that, due to the lack of the bending vibration modes of CF2 molecule at 656 cm-1, 688 cm-1, 723 cm-1, 776 cm-1and 796 cm-1, characteristics of the γ-crystalline phase of PVDF, the nanocomposites casted from solution are mostly in the β-ferroelectric phase of PVDF, besides the γ-paraelectric phase. SEM micrographs were used to evaluate the dispersion state of graphene sheets and the BaSO4 nanoparticles into the polymeric matrix. UV-Vis spectrometry and Differential Scanning Calorimetry (DSC) were also performed in order to complement the structural analysis. The results confirm that the addition of graphene sheets in PVDF polymer-based nanocomposites enhances the X-ray shielding efficiency. The phenomenon is discussed in terms of the reported anomalous negative thermal expansion coefficient of graphene sheets

Keywords

graphenecompositepolymerradiation effects
Type
Articles
Information
MRS Advances , Volume 4 , Issue 3-4: Nanomaterials , 2019 , pp. 169 - 175
Copyright
Copyright © Materials Research Society 2018 

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References

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