通过原子力显微镜通过模量反映海水中的聚乙烯纳米塑料的衰老行为
Runzhe Zhang1, Xinyi Lu1, Wenyi Huang1
1College of Environment and Climate, Guangdong Provincial Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China.
Journal of hazardous materials
|November 10, 2024
概括
这项研究揭示了纳米塑料 (NP) 在海水中的时间变化. 它们的纳米机械特性,就像Young一样.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 纳米塑料 (NP) 对生态系统和人类健康构成重大风险.
- 分析NP衰老的传统方法耗时,具有破坏性,并且需要样本度.
- 人们对NP纳米机械特性与老化之间的关系仍然不太了解.
研究的目的:
- 研究海水中的商品塑料,微塑料和纳米塑料的老化行为.
- 探索氧化和交叉链接对老化纳米塑料的纳米机械性能的影响.
- 建立一种可靠的方法来确定老化纳米塑料中的交叉链接程度.
主要方法:
- 使用原子力显微镜 (AFM) 来评估物理化学性质的变化.
- 在海水中测试过老化的商品塑料,微塑料和纳米塑料.
- 测量了扬模量 (YM),基指数和交联度.
主要成果:
- 纳米塑料的模量 (YM) 在老化过程中显示出快速到缓慢的增长趋势.
- 微塑料在YM中最初呈现缓慢的增长,随后加速.
- 商品塑料显示YM的变化很小,与基指数和交叉链接数据一致.
结论:
- 纳米塑料的老化行为与微塑料和商品塑料有很大的不同.
- 纳米机械性质,特别是模量,与交联和氧化有很强的相关性.
- 这项研究提供了一种新的方法来量化老化纳米塑料的交叉链接.
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