微塑料
材料科学
纳米技术
拉曼光谱
纳米颗粒
化学
环境化学
光学
物理
作者
Seunghyun Moon,Leisha Martin,Seongmin Kim,Qiushi Zhang,Renzheng Zhang,Wei Xu,Tengfei Luo
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2024-01-26
卷期号:10 (4): eadh1675-eadh1675
被引量:78
标识
DOI:10.1126/sciadv.adh1675
摘要
Millions of tons of plastics enter the oceans yearly, and they can be fragmented by ultraviolet and mechanical means into nanoplastics. Here, we report the direct observation of nanoplastics in global ocean water leveraging a unique shrinking surface bubble deposition (SSBD) technique. SSBD involves optically heating plasmonic nanoparticles to form a surface bubble and leveraging the Marangoni flow to concentrate suspended nanoplastics onto the surface, allowing direct visualization using electron microscopy. With the plasmonic nanoparticles co-deposited in SSBD, the surface-enhanced Raman spectroscopy effect is enabled for direct chemical identification of trace amounts of nanoplastics. In the water samples from two oceans, we observed nanoplastics made of nylon, polystyrene, and polyethylene terephthalate—all common in daily consumables. The plastic particles have diverse morphologies, such as nanofibers, nanoflakes, and ball-stick nanostructures. These nanoplastics may profoundly affect marine organisms, and our results can provide critical information for appropriately designing their toxicity studies.
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