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在加速气候变化过程中,从环氧纳米复合材料中碎片化和释放原始和功能化的碳纳米管

Endalkachew Sahle-Demessie¹, Changseok Han^2,3, Eunice Varughese¹

¹U.S. Environmental Protection Agency, Office of Research and Development, Center for Environmental Solution and Emergency Response, Cincinnati, OH, 45268, USA.

Environmental science. Nano

|October 18, 2023

概括

纳米复合材料的环境老化会释放纳米粒子,带来风险. 这项研究检查了碳纳米管 (CNT) /聚合物复合物降解和纳米粒子释放,揭示了释放材料的中度细胞毒性.

科学领域:

材料科学材料科学材料科学
环境科学环境科学
纳米技术纳米技术

背景情况:

越来越多的纳米材料在复合材料中的使用引发了人们对处置后对环境释放的担忧.
复合材料的气候变化可能导致结构恶化,碎片化和纳米颗粒和微塑料的释放.
了解释放的纳米材料 (NM) 的环境命运和毒性对于风险评估至关重要.

研究的目的:

研究从环氧碳纳米管 (CNT) 复合材料中嵌入纳米材料 (NM) 的降解和释放.
分析 CNT 功能化对复合材料老化和 NM 释放的影响.
评估释放的碎片和纳米颗粒的毒性.

主要方法:

用纯净和功能化的多壁CNT (MWCNT) 制备环氧复合材料.
复合材料的加快气候变化,然后通过重力度分析,接触角度,FTIR,SEM和激光共聚焦显微镜进行表征.
使用TEM,FTIR和拉曼光谱对洗水中释放的碎片和纳米粒子进行分析;通过ROS和MTS测定进行毒性评估.

主要成果:

在老化复合材料的可见表面裂之前,发生了疏水性损失.
MWCNTs的功能化影响了复合材料的光降解和NM释放.
释放的聚合物碎片和CNT表现出中度细胞毒性.

结论:

功能化CNT和环氧聚合物之间的分子相互作用显著影响复合物老化和CNT释放.
从老化复合材料中释放的NM具有潜在的环境和人类健康风险.
需要进一步的研究才能充分了解CNT聚合物复合材料对环境的长期影响.

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