PMID- 37126661 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20230516 LR - 20230520 IS - 1520-5827 (Electronic) IS - 0743-7463 (Print) IS - 0743-7463 (Linking) VI - 39 IP - 19 DP - 2023 May 16 TI - Tribology of Pore-Textured Hard Surfaces under Physiological Conditions: Effects of Texture Scales. PG - 6657-6665 LID - 10.1021/acs.langmuir.2c03377 [doi] AB - Micro- and nanotexturing on hard biomaterials have shown advantages for tissue engineering and antifouling applications. However, a growing number of studies have also shown that texturing may cause an increase in friction, demanding further research on the tribological effects of texturing under physiological conditions. This study investigates the tribological effects of micro- and nanopore patterns on hard hydrophilic silicon sliding against soft hydrophobic polydimethylsiloxane (PDMS) immersed in aqueous liquids with various viscosities, simulating the sliding of a textured implant surface against soft tissues. The experimental results show that silicon surfaces with pore textures at both micro- and nanoscale feature sizes confer a higher coefficient of friction (COF) than an untextured one. It is attributed to the texture's edge effect caused by the periodic pore patterns between the two sliding objects with a large difference in material stiffness. For the same solid area fraction, nanopored surfaces show a higher COF than micropored surfaces because of the significantly higher texture edge length per unit area. For micropored surfaces with a similar length of texture edge length per unit area, the COF increases more significantly with the increase in pore size because of the greater stress at the rims of the larger pores. The COFs of both micro- and nanoscale pores generally decrease from approximately 10 to 0.1 with an increase in the surrounding aqueous viscosity, indicating the transition from a boundary lubrication to a mixed lubrication regime while mostly remaining in boundary lubrication. In contrast, the COF of an untextured surface decreases from approximately 1 to 0.01, indicating that it mostly remains in the mixed lubrication regime while showing the tendency toward hydrodynamic lubrication. Compared to a hydrophilic hard probe sliding against a textured hydrophobic soft substrate, the hydrophobic soft probe sliding against a textured hydrophilic hard substrate produces a significantly higher COF under similar physiological conditions due to the larger edge effect. FAU - Xi, Yiwen AU - Xi Y AUID- ORCID: 0000-0002-9613-4366 AD - Department of Mechanical Engineering, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, United States. AD - Department of Biomedical Engineering-FB40, University of Groningen and University Medical Center Groningen, A. Deusinglaan 1, Groningen 9713 AV, The Netherlands. AD - University of Groningen, University Medical Center Groningen, W.J. Kolff Institute for Biomedical Engineering and Materials Science-FB41, A. Deusinglaan 1, Groningen 9713 AV, The Netherlands. FAU - Choi, Chang-Hwan AU - Choi CH AUID- ORCID: 0000-0003-2715-7393 AD - Department of Mechanical Engineering, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, United States. FAU - Chang, Robert AU - Chang R AD - Department of Mechanical Engineering, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, United States. FAU - Kaper, Hans Jan AU - Kaper HJ AD - Department of Biomedical Engineering-FB40, University of Groningen and University Medical Center Groningen, A. Deusinglaan 1, Groningen 9713 AV, The Netherlands. AD - University of Groningen, University Medical Center Groningen, W.J. Kolff Institute for Biomedical Engineering and Materials Science-FB41, A. Deusinglaan 1, Groningen 9713 AV, The Netherlands. FAU - Sharma, Prashant Kumar AU - Sharma PK AUID- ORCID: 0000-0002-8342-8939 AD - Department of Biomedical Engineering-FB40, University of Groningen and University Medical Center Groningen, A. Deusinglaan 1, Groningen 9713 AV, The Netherlands. AD - University of Groningen, University Medical Center Groningen, W.J. Kolff Institute for Biomedical Engineering and Materials Science-FB41, A. Deusinglaan 1, Groningen 9713 AV, The Netherlands. LA - eng PT - Journal Article DEP - 20230501 PL - United States TA - Langmuir JT - Langmuir : the ACS journal of surfaces and colloids JID - 9882736 SB - IM PMC - PMC10193583 COIS- The authors declare no competing financial interest. EDAT- 2023/05/01 18:42 MHDA- 2023/05/01 18:43 PMCR- 2023/05/18 CRDT- 2023/05/01 15:03 PHST- 2023/05/01 18:43 [medline] PHST- 2023/05/01 18:42 [pubmed] PHST- 2023/05/01 15:03 [entrez] PHST- 2023/05/18 00:00 [pmc-release] AID - 10.1021/acs.langmuir.2c03377 [doi] PST - ppublish SO - Langmuir. 2023 May 16;39(19):6657-6665. doi: 10.1021/acs.langmuir.2c03377. Epub 2023 May 1.