Abstract
We present a cheap, efficient, and non-hazardous protocol for altering the roughness of hard particles at the nanometer-scale using a stone tumbler, a tool which is normally used for polishing stones. Six different textures were achieved by lining the tumbler with sandpaper of mean grit diameters dg=201 , 58.5, 18.3, 12.6, and 8.4μm . Two textures were created by tumbling a batch of glass spheres for 4 h and for 12 h with the 12.6μm sandpaper; all other textures were established by tumbling for 12 h. Surface roughness was characterized by the integral length scale, ξ , evaluated from 7 nm/pix resolution scanning electron microscope images. Roughness size increased from ξ=24 to 31 nm as the grit size decreased from dg=201 to 18.3μm , and then decreased to ξ=6.4nm at the smallest dg . The largest ξ(=34nm) was achieved using a 12.6μm sandpaper and the shorter tumbling time of 4 h. The permeability of a packed column of the particles broadly decreased with increasing ξ , indicating that permeability decreases with increasing roughness size.
Original language | English |
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Article number | 115 |
Number of pages | 6 |
Journal | Tribology Letters |
Volume | 67 |
Issue number | 4 |
Early online date | 30 Sep 2019 |
DOIs | |
Publication status | Published - Dec 2019 |
Keywords
- surface roughness
- SEM
- abrasive wear
- glass
- polishing
- permeability
- surface metrology
- correlation length
- WETTABILITY
- SOLID-SURFACES
- Glass
- SIZE
- Polishing
- Surface roughness
- Permeability
- Surface metrology
- ROUGHNESS
- FLOW
- IMPACT
- Abrasive wear
- CONTACT ANGLES
- Correlation length