The Influence of Surface Wettability and Topography on the Bioactivity of TiO2/Epoxy Coatings on AISI 316L Stainless Steel

Kocijan, Aleksandra; Conradi, Marjetka; Hočevar, Matej

doi:10.3390/ma12111877

Cited by 37 publications

(15 citation statements)

References 31 publications

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“…Due to its low weight, chemical stability, optical transparency, and low price, PET is widely used in many fields like packaging, food industry, textiles, electronics, and biomedical devices [ 3 , 4 , 5 ]. Especially in the food industry, pharmaceutical packaging, and biomedical applications, the non-wetting and easy-to-clean PET surfaces are of special interest due to the intrinsic antibacterial potential [ 6 , 7 ]. There are several innovative strategies to manipulate the wetting behavior of polymer surfaces, for instance plasma activation, thermal drawing, nanoparticles deposition, or applying functional coatings [ 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

et al. 2021

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Nowadays, the demand for surface functionalized plastics is constantly rising. To address this demand with an industry compatible solution, here a strategy is developed for producing hierarchical microstructures on polyethylene terephthalate (PET) by hot embossing using a stainless steel stamp. The master was structured using three laser-based processing steps. First, a nanosecond-Direct Laser Writing (DLW) system was used to pattern dimples with a depth of up to 8 µm. Next, the surface was smoothed by a remelting process with a high-speed laser scanning at low laser fluence. In the third step, Direct Laser Interference Patterning (DLIP) was utilized using four interfering sub-beams to texture a hole-like substructure with a spatial period of 3.1 µm and a depth up to 2 µm. The produced stamp was used to imprint PET foils under controlled temperature and pressure. Optical confocal microscopy and scanning electron microscopy imaging showed that the hierarchical textures could be accurately transferred to the polymer. Finally, the wettability of the single- and multi-scaled textured PET surfaces was characterized with a drop shape analyzer, revealing that the highest water contact angles were reached for the hierarchical patterns. Particularly, this angle was increased from 77° on the untreated PET up to 105° for a hierarchical structure processed with a DLW spot distance of 60 µm and with 10 pulses for the DLIP treatment.

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Section: Introductionmentioning

confidence: 99%

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

et al. 2021

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“…We can find research on biological applications studying surfaces, polymers, or composites with (highly) hydrophobic as well as hydrophilic properties [17,18,19,20]. And, as stated in [21], discussion is ongoing about, e.g., the dependence of bacterial adhesion upon wettability.…”

Section: Introductionmentioning

confidence: 99%

Fast Surface Hydrophilization via Atmospheric Pressure Plasma Polymerization for Biological and Technical Applications

et al. 2019

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Polymeric surfaces can benefit from functional modifications prior to using them for biological and/or technical applications. Surfaces considered for biocompatibility studies can be modified to gain beneficiary hydrophilic properties. For such modifications, the preparation of highly hydrophilic surfaces by means of plasma polymerization can be a good alternative to classical wet chemistry or plasma activation in simple atomic or molecular gasses. Atmospheric pressure plasma polymerization makes possible rapid, simple, and time-stable hydrophilic surface preparation, regardless of the type and properties of the material whose surface is to be modified. In this work, the surface of polypropylene was coated with a thin nanolayer of plasma-polymer which was prepared from a low-concentration mixture of propane-butane in nitrogen using atmospheric pressure plasma. A deposition time of only 1 second was necessary to achieve satisfactory hydrophilic properties. Highly hydrophilic, stable surfaces were obtained when the deposition time was 10 seconds. The thin layers of the prepared plasma-polymer exhibit highly stable wetting properties, they are smooth, homogeneous, flexible, and have good adhesion to the surface of polypropylene substrates. Moreover, they are constituted from essential elements only (C, H, N, O). This makes the presented modified plasma-polymer surfaces interesting for further studies in biological and/or technical applications.

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“…Next, we investigated the water contact angle and the roughness. The surface properties, including suitable wettability and roughness, are essential to improve cell attachment and to suppress bacteria attachment [27][28][29]. As shown in Figure 1b,c, the contact angle of the chitosan solution-coated titanium was 61.5 • , and the contact angles of the GC hybrid implants were 56.2 • (1% GC), 54.6 • (3% GC), and 54.5 • (5% GC).…”

Section: Fabrication and Characterization Of The Gc Hybrid Implantmentioning

confidence: 99%

Graphene–Chitosan Hybrid Dental Implants with Enhanced Antibacterial and Cell-Proliferation Properties

et al. 2020

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Dental implants are widely used tooth replacement tools owing to their good oral rehabilitation and reconstruction capacities. Since dental implants are designed as a replacement for natural teeth, multi-functional abilities are desired to achieve successful implant treatment with improved osseointegration through promotion of mammalian cell activity and prevention of bacterial cell activity. In this study, we developed a graphene–chitosan hybrid dental implant (GC hybrid implant) using various concentrations of graphene, which demonstrated the different surface properties including increased wettability and roughness. Importantly, the GC hybrid implant under the optimal condition (i.e., 1% GC hybrid implant) could significantly promote osteoblast proliferation while reducing biofilm formation and bacterial activity. Our study demonstrates the potential of using this GC hybrid implant as a new type of dental implant, which can offer an effective design for the fabrication of advanced dental implants.

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The Influence of Surface Wettability and Topography on the Bioactivity of TiO2/Epoxy Coatings on AISI 316L Stainless Steel

Cited by 37 publications

References 31 publications

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

Fast Surface Hydrophilization via Atmospheric Pressure Plasma Polymerization for Biological and Technical Applications

Graphene–Chitosan Hybrid Dental Implants with Enhanced Antibacterial and Cell-Proliferation Properties

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