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Settling behaviors of microplastic disks in acceleration fall

Marine Pollution Bulletin 2024 6 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Zijian Yu, Zijian Yu, Yang Ge, Zijian Yu, Zijian Yu, Zijian Yu, Zijian Yu, Yang Ge, Yang Ge, Zijian Yu, Zijian Yu, Yang Ge, Zijian Yu, Zijian Yu, Zijian Yu, Zijian Yu, Yang Ge, Yang Ge, Yang Ge, Wenming Zhang, Wenming Zhang, Abul B. M. Baki Abul B. M. Baki Zijian Yu, Yang Ge, Zijian Yu, Yang Ge, Abul B. M. Baki Wenming Zhang, Abul B. M. Baki Zijian Yu, Zijian Yu, Yongchao Zhou, Abul B. M. Baki Wenming Zhang, Yongchao Zhou, Wenming Zhang, Wenming Zhang, Yongchao Zhou, Wenming Zhang, Abul B. M. Baki Wenming Zhang, Wenming Zhang, Abul B. M. Baki Abul B. M. Baki Xinzai Peng, Wenming Zhang, Abul B. M. Baki Abul B. M. Baki Wenming Zhang, Zijian Yu, Wenming Zhang, Wenming Zhang, Zijian Yu, Yongchao Zhou, Abul B. M. Baki Abul B. M. Baki Abul B. M. Baki Abul B. M. Baki Abul B. M. Baki Yongchao Zhou, Wenming Zhang, Wenming Zhang, Abul B. M. Baki Abul B. M. Baki Wenming Zhang, Yongchao Zhou, Yongchao Zhou, Wenming Zhang, Wenming Zhang, Wenming Zhang, Wenming Zhang, Abul B. M. Baki Abul B. M. Baki

Summary

Researchers studied the settling behavior of disk-shaped microplastics during free-fall in water, using high-speed imaging to track the orientation and velocity of particles as they descended. Disk-shaped particles exhibited oscillating and tumbling motions that slowed settling compared to spheres of equivalent mass, with implications for predicting microplastic transport and deposition in aquatic environments.

The settling of microplastics (MPs) in the initial acceleration fall stage, i.e., before reaching the terminal settling velocity, has not been investigated, which is however important for understanding MP transport and fate. MP disks sized 3-5 mm, of three shapes and made of three polymers (1.038-1.343 g/cm<sup>3</sup>) were examined. Five release ways and three release angles (0°, 45°, 90°) were used. MP disks with the release angle of 0° start to zigzag immediately after the release, while the MP disks with the release angles of 45° and 90° first adjust to a horizontal position and then zigzag. The adjustment distances in the vertical and horizontal directions, as well as the maximum vertical settling velocity, are influenced by MP density, size, release angle and release way. The detailed settling trajectory and velocity were also analyzed. Finally, the time-changing drag coefficient of MP disks was examined and discussed.

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