Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14365/1207
Title: Carbon nanotube release from polymers into a food simulant
Authors: Xia, Yining
Unalan, Ilke Uysal
Rubino, Maria
Auras, Rafael
Keywords: Carbon nanotubes
Nanocomposite
Polymer flakes
Release
Surface phenomenon
Reinforced Nylon-6 Composites
Mechanical-Properties
Clay Nanocomposites
Health-Risk
Toxicity
Nanomaterials
Surfactant
Exposure
Publisher: Elsevier Sci Ltd
Abstract: The release assessment of multi-walled carbon nanotubes (CNTs) was performed on two types of polymer-CNT nanocomposites: polypropylene (PP) and polyamide 6 (PA6) containing 3 wt% CNT. Nanocomposite films were prepared and then exposed to ethanol as a fatty-food simulant at 40 degrees C, and the amount of CNT release into ethanol was determined by ultraviolet-visible spectroscopy (UV-Vis) and graphite furnace atomic absorption spectrometry (GFAAS). The CNTs released into ethanol were visualized by transmission electron microscopy (TEM) and verified by Raman spectroscopy. UV-Vis analysis showed a very small amount of CNT release from the nanocomposite films into ethanol over 60 d: maximum CNT concentrations in ethanol were 1.3 mg/L for the PP-CNT film and 1.2 mg/L for the PA6-CNT film. GFAAS results indicated that the amount of CNTs released into ethanol after 12 d was over 20-fold higher than the results obtained by UV-Vis. Overestimation of CNT release by GFAAS suggested aggregation and poor dispersion of CNTs in the solvent. This assumption was verified by TEM images exhibiting the embedded CNTs in the polymer flakes, which could be poorly dispersed in the solvent. In general, CNT release from the nanocomposite films was considered a surface phenomenon, as indicated by detachment of CNT-containing polymer flakes from the film surface. (C) 2017 Elsevier Ltd. All rights reserved.
URI: https://doi.org/10.1016/j.envpol.2017.06.067
https://hdl.handle.net/20.500.14365/1207
ISSN: 0269-7491
1873-6424
Appears in Collections:PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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