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.

The method of conversion, properties and usage of hydrophobic coatings on the bases of silicon dioxide is presented in the article. These layers are formed by use the silanes which are not react with water. What is more, these layers could provide not only great resistance to the effect of water molecules, but also better resistance to the effect of abrasive action and hardness as well as keeping the top stair of the transparency. Uncomplicated methods such as zol-zel are used to settling these layers. There are methods of putting on the various surfaces, without necessity of usage specific and sophisticated technological solutions. As a transparent and simple to keep in the cleanness surfaces these layers found application in various field such as sport, motorization, building industry, optical system whether in our houses.

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