Effect of surface roughness and surface topography on wettability of machined biomaterials using flexible viscoelastic polymer abrasive media

Abstract

Unidirectional abrasive flow finishing process was used to finish stainless steel SS316L and titanium alloy Ti-6Al-4V materials which are widely used as implant materials. Viscoelastic polymer-based flexible abrasive media was used to finish these surfaces with different pressure and number of cycles. The obtained surface roughness and surface topography were measured using profilometer, and morphology of the surface was studied using a scanning electron microscope. Further, the wettability of the finished surface was studied by measuring the contact angle (θ) for three liquids-water, formamide, and diiodomethane using the sessile drop technique. The measured contact angles were used to ascertain the surface free energy components using Van Oss Chaudhury-Good equation. Significant difference was observed on surface roughness, contact angle, and surface energy of the machined surfaces at different finishing cycles. Also, the different tendencies of the droplet contact angle and surface energy have been observed along the direction parallel and perpendicular to the finishing direction and it gave a strong conclusion that surface roughness and surface textures play a significant role in wetting characteristics. So, this work provides an overview of the interaction between droplet and surface topography of finished SS316L and Ti-6Al-4V surfaces. Further, an empirical model has been developed using the response surface methodology (RSM) for output responses namely, average surface roughness (R a ) and material removed (MR). Interactive effects of number of cycles and pressure on average surface roughness and material removed are discussed in this paper.

Differently Charged P (VDF-TrFE) Membranes Influence Osteogenesis Through Differential Immunomodulatory Function of Macrophages

“…The results were indirectly reflected by the increased β-phase contents and d 33 values, in line with previous studies (Zhang et al, 2018;Khare et al, 2020;Dai et al, 2021). Moreover, the wettability is a critical factor in determining cell behavior, which can be influenced by the surface topography and roughness (Kim et al, 2016;Kumar and Hiremath, 2019). Based on our results of surface topography and surface roughness measured by previous studies (Zhang et al, 2018;Bai et al, 2019), there were no significant differences in surface roughness and topography of P (VDF-TrFE) membranes before and after poling treatment.…”

Surface Characterization and Tribological Performance Analysis of Electric Discharge Machined Duplex Stainless Steel

“…The increased surface roughness leads to enhance the surface free energy by offering the expanded surface area to water droplet [ 48 , 49 ]. Therefore, surface alteration enhances the wetting responses of surface that endorse the machined substrate applications in the biomedical domain, lubrication and for different coatings [ 50 , 51 ].…”

Overview of sterilization methods for UHMWPE through surface analysis

“…Surface roughness is a major criterion for assessing biomaterials in terms of biocompatibility, due to their ability of providing a prediction model for cellular and bacterial adhesion. 1,2,7 Many works have correlated this property with cell adhesion and biocompatibility, with no universal consensus yet achieved; rather, materials are individually considered depending on their class, surface energy, and application. [36][37][38] In this work, the average roughness (R a ) of the samples sterilized by different techniques was measured by stylus profilometry and AFM.…”

“…Ultra-high molecular weight polyethylene (UHMWPE) is the most used biomaterial in orthopedic joint prosthesis, with its use dating back to the 1960s'. [1][2][3] UHMWPE has a semicrystalline structure, with around half of polymeric chains organized in the form of crystalline lamellae and the other half in a crosslinked amorphous phase. 4 This feature is occasioned by its glass transition temperature T g = À80 1C and melting point T melt = 135 1C, both of which allow the unique viscosity.…”