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Title: Glass-particle adhesion-force-distribution on clean (laboratory) and contaminated (outdoor) surfaces

Journal Article · · Journal of Aerosol Science
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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This article explores whether laboratory-clean samples are representative of real outdoor surfaces – often covered in dust and other contaminants – with respect to adhesion properties, which ultimately affect particle resuspension. In this study, Atomic Force Microscopy (AFM) was used to measure the adhesion force between a clean, smooth glass particle (5 µm in diameter) and two glass slides, one prepared according to common laboratory practices (hereafter, clean glass) and a second one left outdoors for six weeks (hereafter, contaminated glass). It was found that the adhesion force distribution was bimodal for the clean glass while it showed three peaks for the contaminated glass. For both surfaces, the adhesion force showed a peak at very low adhesion values (< 100 nN) representing 1.2% of the measurements for the clean glass and 58% for the contaminated glass. This low-adhesion peak is important because it represents the particles that would be resuspended first even in light winds. The low adhesion-force measurements were associated with the presence of contaminants on the surface. Another notable difference between the adhesion force distributions was a long tail at high adhesion forces for clean glass (up to ~1900 nN) and the absence of the tail for the contaminated glass, which had a maximum adhesion force of 950 nN. The mean adhesion force on the contaminated glass was also lower than on the clean glass (206 ± 240 nN vs. 516 ± 354 nN). These observations indicate that the adhesion force distribution between a 5-µm smooth and clean glass sphere and the outdoor contaminated glass surface is quite different from that of the clean glass surface. Hence, one should be cautious when using adhesion force measurements from clean surfaces to estimate particle resuspension from outdoor surfaces.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396; AC04-94AL85000; 20140444ER; AC04–94AL85000
OSTI ID:
1494460
Alternate ID(s):
OSTI ID: 1691888
Report Number(s):
LA-UR-16-27262
Journal Information:
Journal of Aerosol Science, Vol. 123, Issue C; ISSN 0021-8502
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (4)

Overview of mechanistic particle resuspension models: comparison with compilation of experimental data journal August 2019
A model for particle removal from surfaces with large-scale roughness in turbulent flows journal December 2019
Overview of mechanistic particle resuspension models: comparison with compilation of experimental data text January 2019
Overview of mechanistic particle resuspension models: comparison with compilation of experimental data text January 2019

Figures / Tables (21)

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Outdoor Resuspension
Atomic Force Microscopy
Adhesion Force Distribution
Surface Roughness Distribution
Contaminated surfaces