J. Mater. Sci. Technol. ›› 2021, Vol. 81: 151-161.DOI: 10.1016/j.jmst.2021.01.011
• Research Article • Previous Articles Next Articles
Subash Bommu Chinnaraja, Pahala Gedara Jayathilakea,b, Jack Dawsona, Yasmine Ammara, Jose Portolesa, Nicholas Jakubovicsc, Jinju Chena,*()
Received:
2020-07-12
Revised:
2020-12-09
Accepted:
2020-12-14
Published:
2021-01-10
Online:
2021-01-10
Contact:
Jinju Chen
About author:
*E-mail address: Jinju.chen@ncl.ac.uk (J. Chen).Subash Bommu Chinnaraj, Pahala Gedara Jayathilake, Jack Dawson, Yasmine Ammar, Jose Portoles, Nicholas Jakubovics, Jinju Chen. Modelling the combined effect of surface roughness and topography on bacterial attachment[J]. J. Mater. Sci. Technol., 2021, 81: 151-161.
Fig. 4. (a) Schematic diagram of the overall concept of the computational modelling to study the combined effect of surface pattern and surface roughness on bacterial attachment in flow conditions; (b) Schematic diagram of a spherical cell interaction with the rough surface after using the surface element integration technique: Side and Top views.
Average roughness (nm) | RMS roughness (nm) | Surface area difference (SAD) | |
---|---|---|---|
Plain surface | 47.0 ± 3.3 | 54.5 ± 3.9 | 3.15 % |
10 μm channels | 55.8 ± 4.6 | 71.1 ± 5.9 | 7.54 % |
40 μm channels | 255.9 ± 28.5 | 304.7 ± 35.8 | 29.35 % |
Table 1 Measured roughness parameters and calculated SAD for different stainless steel samples.
Average roughness (nm) | RMS roughness (nm) | Surface area difference (SAD) | |
---|---|---|---|
Plain surface | 47.0 ± 3.3 | 54.5 ± 3.9 | 3.15 % |
10 μm channels | 55.8 ± 4.6 | 71.1 ± 5.9 | 7.54 % |
40 μm channels | 255.9 ± 28.5 | 304.7 ± 35.8 | 29.35 % |
Zeta potential (mV) | γLW (mJ/m2) | γ+ (mJ/m2) | γ- (mJ/m2) | |
---|---|---|---|---|
Stainless steel | -25.0 ± 0.8 [ | 41.40 | 0.04 | 3.14 |
Bacteria | -10.0 ± 0.1 | 25.26 | 0.43 | 4.69 |
Table 2 Zeta potential and surface energy components for bacteria and stainless steel.
Zeta potential (mV) | γLW (mJ/m2) | γ+ (mJ/m2) | γ- (mJ/m2) | |
---|---|---|---|---|
Stainless steel | -25.0 ± 0.8 [ | 41.40 | 0.04 | 3.14 |
Bacteria | -10.0 ± 0.1 | 25.26 | 0.43 | 4.69 |
Average roughness (nm) | RMS roughness (nm) | |
---|---|---|
Plain surface | 45.2 | 54 |
10 μm channels | 56.6 | 69.3 |
40 μm channels | 254.9 | 303.8 |
Table 3 Simulated roughness parameters for different stainless steel samples based on surface element integration.
Average roughness (nm) | RMS roughness (nm) | |
---|---|---|
Plain surface | 45.2 | 54 |
10 μm channels | 56.6 | 69.3 |
40 μm channels | 254.9 | 303.8 |
Fig. 7. Comparisons of the measured bacterial surface coverage of saliva coated and uncoated surfaces based on fluorescence images (p values *<0.001 and **<0.0001) and predicted bacterial surface coverage by computational simulations.
Fig. 8. Typical SEM images of bacteria attached to SS surfaces: (a) 10 μm surface, (b) 40 μm surfaces and (c) the measured bacterial surface coverage based on SEM images.
Fig. 9. (a) Experimental (p > 0.89) and computational surface coverage of bacteria on different surfaces under shear rate of 89.6 s -1; (b) Experimental (p < 0.05) and computational surface coverage of bacteria on different surfaces under shear rate of 176.3 s -1; (c) Experimental (p < 0.05) and computational surface coverage of bacteria on different surfaces under shear rate of 559.1 s -1. The experimental data is presented as the mean ± SD from three independent experiments.
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