Antibacterial Properties of Zn Doped Hydrophobic SiO2 Coatings Produced by Sol-Gel Method

Abstract

Bacteria existing on the surfaces of various materials can be both a source of infection and an obstacle to the proper functioning of structures. Increased resistance to colonization by microorganisms can be obtained by applying antibacterial coatings. This paper describes the influence of surface wettability and amount of antibacterial additive (Zn) on bacteria settlement on modified SiO2-based coatings. The coatings were made by sol-gel method. The sols were prepared on the basis of tetraethoxysilane (TEOS), modified with methyltrimethoxysilane (MTMS), hexamethyldisilazane (HMDS) and the addition of zinc nitrate or zinc acetate. Roughness and surface wettability tests, as well as study of the chemical structure of the coatings were carried out. The antibacterial properties of the coatings were checked by examining their susceptibility to colonization by Escherichia coli. It was found that the addition of zinc compound reduced the susceptibility to colonization by E. coli, while in the studied range, roughness and hydrophobicity did not affect the level of bacteria adhesion to the coatings.

Surface Modifications for Implants Lifetime extension: An Overview of Sol-Gel Coatings

“…In many studies, titanium implants are coated with sol-gel films containing metal additives, such as Ag [98][99][100], Cu [101], or Zn [102]. Fu et al [103] and Massa et al [104] reported the impact of Ag on bacteria growth and the biofilm formation.…”

Antireflective, Transparent, Water-Resistant, and Antibacterial Zn-Doped Silicon Oxide Thin Films for Touchscreen-Based Display Applications

“…23,24 Zn-doped SiO 2 nanoparticles are promising candidates, owing to their biocompatibility and lower toxicity. 25,26 For example, Arshad et al investigated the antibacterial effect of Zn-doped SiO 2 nanoparticles under various solvents and demonstrated that the prepared nanoparticles exhibited very low antibacterial activity. 25 However, Zn-doped SiO 2 nanoparticles synthesized using solution methods also exhibited poor mechanical properties because of weak adhesion to glass substrates.…”

“…An ideal uniform single-layer antireflective coating satisfies the following criteria: the thickness of the coated film should meet quarter-wave optical thickness ( t = λ/4 n c ), where λ denotes the wavelength of the incident light and , where n c , n a , and n s are the refractive index of coating, air, and substrate, respectively. , According to above condition, antireflective coating on the glass ( n = 1.52) must has the refractive index of 1.23; however, there is no existence of solids with such a low refractive index value . SiO 2 -based films are widely used as antireflection coatings in solar cells to improve their efficiency by increasing the absorption of solar radiation. , Furthermore, SiO 2 nanoparticles are widely used in optical and electronic device applications, owing to their impressive properties including low dielectric constant, thermal insulation, and anticorrosion and antireflection properties. , Furthermore, SiO 2 nanoparticles have been employed in biomedical applications because of their biocompatibility, biodegradability, and non-toxic nature. − Many studies have also focused on enhancing the antibacterial activity of SiO 2 nanoparticles by doping of various metals. , Zn-doped SiO 2 nanoparticles are promising candidates, owing to their biocompatibility and lower toxicity. , For example, Arshad et al investigated the antibacterial effect of Zn-doped SiO 2 nanoparticles under various solvents and demonstrated that the prepared nanoparticles exhibited very low antibacterial activity . However, Zn-doped SiO 2 nanoparticles synthesized using solution methods also exhibited poor mechanical properties because of weak adhesion to glass substrates.…”

Oxide Nanostructured Coating for Power Lines with Anti-Icing Effect

“…However, to form a film with superhydrophobic properties, it is not enough to use only silicon dioxide. Many studies show that modification of SiO 2 with other oxide particles, such as TiO 2 , ZnO, ZrO 2 , Fe 2 O 3 , etc., is beneficial [26][27][28][29][30]. Therefore, the purpose of this work was to develop a technique to obtain a nanostructured oxide coating to protect power lines from icing, and investigate its elemental composition, morphology, structural and mechanical properties, and practical effectiveness.…”