Characterization of powder flow properties from micron to nanoscale using FT4 powder rheometer and PT-X powder tester--颗粒学报PARTICUOLOGY

Du, H., Lu, H., Tang, J., & Liu, H. (2023). Characterization of powder flow properties from micron to nanoscale using FT4 powder rheometer and PT-X powder tester. Particuology, 75, 1-10. https://doi.org/10.1016/j.partic.2022.05.014

Characterization of powder flow properties from micron to nanoscale using FT4 powder rheometer and PT-X powder tester

Hui Du, Haifeng Lu ^*, Jie Tang, Haifeng Liu

Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai, 200237, China

10.1016/j.partic.2022.05.014

Volume 75, April 2023, Pages 1-10

Received 18 March 2022, Revised 26 May 2022, Accepted 30 May 2022, Available online 14 June 2022, Version of Record 30 June 2022.

E-mail: luhf@ecust.edu.cn

Highlights

• Compressibility and friction properties of micron to nano particles were studied.

• The wall pressure distribution of particles in the silo was studied.

• Dynamic characteristics of micron to nano particles were studied.

• Dynamic properties developed from particle-dominated to aggregate-dominated.

Abstract

The rapid development of nanotechnology has led to a need to further understand the physical characteristics of nanoparticles. In this paper, the flow characteristics of micro-nano alumina particles with different particle sizes were characterized. The FT4 powder rheometer and the PT-X powder tester were used to measure the compression, friction, and dynamic properties of powders. Powder compressibility increased significantly as the particle size decreased from 27 μm to 30 nm. Pressure distribution in the silo was measured and predicted by Janssen's theory, with errors mostly less than 10%. The basic flow energy and the specific energy of the three powders were 4983, 1734, and 244 mJ, and 6.80, 11.70, and 6.70 mJ/g, respectively, indicating that there was no linear relationship between the change in flowability and particle size. The dynamic properties of the powders change from particle-dominated to agglomeration-dominated as the particle size decreases. The conclusion is supported by the results of field emission scanning electron microscopy.

Graphical abstract

Keywords

Micro-nano powders; Flow properties; Compressibility; Frictional properties; Pressure distribution

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