用传输电子显微镜 (ePDF) 分析微粒和纳米塑料颗粒因剂量依赖光束诱导的结构变化的结构识别和观察
Christian Rohner1, Christoph Pratsch2, Robert Schlögl1,3
1Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany.
概括
使用电子对分布函数 (ePDF) 的电子衍射分析可以识别微型和纳米塑料 (MNP) 到100nm. 这种方法有助于区分聚合物类型和分析光束损伤,有助于环境MNP研究.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 分析化学 分析化学
背景情况:
- 微塑料和纳米塑料 (MNP) 对水生微生物构成潜在的风险.
- 准确地描述MNP对于环境风险评估至关重要.
研究的目的:
- 通过电子对分布函数 (ePDF) 建立电子衍射 (ED) 分析,作为特征和识别微型和纳米塑料 (MNP) 的方法.
- 用常见的聚合物和纳米颗粒来证明该方法的适用性.
- 通过使用时间解析ED测量来研究碳基聚合物的光束灵敏度.
主要方法:
- 传输电子显微镜 (TEM) 与电子衍射 (ED) 相结合,以获得散射强度数据.
- 分析总散射强度以导出电子对分布函数 (ePDF).
- 实验确定的减少对密度函数 (RDF) 与模型RDF用于聚合物识别的比较.
- 时间解析ED测量以评估聚合物样本上的光束损伤影响.
主要成果:
- 电子衍射分析的ePDF成功地描述和识别了MNP到100nm.
- 独特的RDF允许区分各种聚合物类型,包括聚乙烯,聚烯,聚乙烯二甲和聚胺.
- 时间解析ED测量使得可视化和分析光束诱导的碳基聚合物的降解.
结论:
- 对ED数据的ePDF分析是一种可行的和有效的方法来表征和识别MNP.
- 该技术允许区分不同类型的聚合物,并研究光束损伤.
- 电子邮件 (ePDF) 分析有望促进对MNP环境影响的理解.
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