Abstract
Hydrogels display extremely complex frictional behavior with surprisingly slippery surfaces. We measure the sliding behavior of hydrogels submerged in water using a custom-made tribotool. Samples with an imposed surface roughness give two distinct frictional regimes. Friction coefficients in the first regime change with asperity sizes and Young's moduli. Under increased normal force, a second frictional regime emerges likely due to smoothening of asperities. Friction coefficients in the second regime remain constant across length scales of roughness and appear to be material specific. The hydrogel polymer network also directly influences the surface topography, and with that, the frictional behavior of hydrogels. We highlight the tribological importance of surface roughness at different length scales, which provides potential to engineer functional frictional behavior.
| Original language | English |
|---|---|
| Article number | 105903 |
| Journal | Tribology International |
| Volume | 141 |
| DOIs | |
| Publication status | Published - 1 Jan 2020 |
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Keywords
- Asperity size
- Friction
- Hydrogels
- Surface roughness
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Natural and induced surface roughness determine frictional regimes in hydrogel pairs. / Rudge, Raisa E.D.; Scholten, Elke; Dijksman, Joshua A.
In: Tribology International, Vol. 141, 105903, 01.01.2020.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Natural and induced surface roughness determine frictional regimes in hydrogel pairs
AU - Rudge, Raisa E.D.
AU - Scholten, Elke
AU - Dijksman, Joshua A.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - Hydrogels display extremely complex frictional behavior with surprisingly slippery surfaces. We measure the sliding behavior of hydrogels submerged in water using a custom-made tribotool. Samples with an imposed surface roughness give two distinct frictional regimes. Friction coefficients in the first regime change with asperity sizes and Young's moduli. Under increased normal force, a second frictional regime emerges likely due to smoothening of asperities. Friction coefficients in the second regime remain constant across length scales of roughness and appear to be material specific. The hydrogel polymer network also directly influences the surface topography, and with that, the frictional behavior of hydrogels. We highlight the tribological importance of surface roughness at different length scales, which provides potential to engineer functional frictional behavior.
AB - Hydrogels display extremely complex frictional behavior with surprisingly slippery surfaces. We measure the sliding behavior of hydrogels submerged in water using a custom-made tribotool. Samples with an imposed surface roughness give two distinct frictional regimes. Friction coefficients in the first regime change with asperity sizes and Young's moduli. Under increased normal force, a second frictional regime emerges likely due to smoothening of asperities. Friction coefficients in the second regime remain constant across length scales of roughness and appear to be material specific. The hydrogel polymer network also directly influences the surface topography, and with that, the frictional behavior of hydrogels. We highlight the tribological importance of surface roughness at different length scales, which provides potential to engineer functional frictional behavior.
KW - Asperity size
KW - Friction
KW - Hydrogels
KW - Surface roughness
U2 - 10.1016/j.triboint.2019.105903
DO - 10.1016/j.triboint.2019.105903
M3 - Article
VL - 141
JO - Tribology International
JF - Tribology International
SN - 0301-679X
M1 - 105903
ER -