Title
Characterization of dust particles’ 3D shape and roughness with nanometer resolution
Document Type
Article
Publication Date
2-19-2015
Abstract
Mineral dust particles in the atmosphere are often aspherical and their shape is important for a multitude of processes. Yet, measurements of the true shape in three dimensions are rare, even in a laboratory setting. Here, we employ atomic force microscopy to determine the 3D shape and surface roughness for two dusts commonly used in laboratory experiments, Arizona test dust (ATD) and kaolinite. Our major finding is that both are thin and remarkably smooth. An oblate spheroidal description is an excellent fit to these data. We use correlation analysis to further examine the surface properties of the dusts and find essentially no features at horizontal spatial scales between ∼10 and 100 nm. This surprising result is supported by the agreement between our specific surface area and BET surface area measurements. The thin, smooth, spheroidal approximation has many implications for physical processes in the atmosphere, including dust transport and radiative transfer.
Publication Title
Aerosol Science and Technology
Recommended Citation
Woodward, X.,
Kostinski, A.,
China, S.,
Mazzoleni, C.,
&
Cantrell, W.
(2015).
Characterization of dust particles’ 3D shape and roughness with nanometer resolution.
Aerosol Science and Technology,
49(4), 229-238.
http://doi.org/10.1080/02786826.2015.1017550
Retrieved from: https://digitalcommons.mtu.edu/physics-fp/174
Publisher's Statement
Copyright 2015 American Association for Aerosol Research. Publisher's version of record: https://doi.org/10.1080/02786826.2015.1017550