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首页> 外文期刊>Environmental Pollution >Carbon nanotube release from polymers into a food simulant
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Carbon nanotube release from polymers into a food simulant

机译：碳纳米管从聚合物释放到食品模拟物中

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摘要

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.
机译：对两种类型的聚合物-CNT纳米复合材料进行了多壁碳纳米管（CNT）的释放评估：聚丙烯（PP）和含有3 wt％CNT的聚酰胺6（PA6）。制备纳米复合膜，然后将其作为脂肪类食品模拟物在40℃下暴露于乙醇中，并通过紫外可见光谱（UV-Vis）和石墨炉原子吸收光谱法（GFAAS）确定碳纳米管释放到乙醇中的量。释放到乙醇中的碳纳米管通过透射电子显微镜（TEM）进行可视化，并通过拉曼光谱进行验证。 UV-Vis分析表明，在60 d内，纳米复合膜中的CNT释放量很小，乙醇中最大的CNT浓度对于PP-CNT膜为1.3 mg / L，对于PA6-CNT膜为1.2 mg / L。 GFAAS结果表明，在12 d后释放到乙醇中的CNT的量比通过UV-Vis获得的结果高20倍以上。 GFAAS高估了CNT的释放量，表明CNT聚集并且在溶剂中的分散性很差。通过TEM图像证实了这一假设，该图像显示出聚合物薄片中嵌入的CNT，这些薄片可能很难分散在溶剂中。通常，从纳米复合膜释放的CNT被认为是表面现象，如含CNT的聚合物薄片从膜表面的分离所表明的。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Environmental Pollution》 |2017年第10期|818-826|共9页
  • 作者

    Xia Yining; Unalan Ilke Uysal; Rubino Maria; Auras Rafael;

  • 作者单位

    Michigan State Univ, Sch Packaging, E Lansing, MI 48824 USA|Chinese Acad Agr Sci, Inst Qual Stand & Testing Technol Agroprod, Beijing 100081, Peoples R China;

    Michigan State Univ, Sch Packaging, E Lansing, MI 48824 USA|Izmir Univ Econ, Fac Engn, Dept Food Engn, TR-35330 Izmir, Turkey;

    Michigan State Univ, Sch Packaging, E Lansing, MI 48824 USA;

    Michigan State Univ, Sch Packaging, E Lansing, MI 48824 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carbon nanotubes; Nanocomposite; Polymer flakes; Release; Surface phenomenon;

    机译：碳纳米管;纳米复合材料;聚合物薄片;脱模;表面现象;

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