Ceramics-Silikáty 56, (4) 314 - 322 (2012) |
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COMPARISON OF SOL-GEL SILICATE COATINGS ON Ti SUBSTRATE |
Horkavcová Diana 1, Běloubková Tereza 1, Mizerová Zuzana 1,
Šanda Ludvík 1,
Cílová Zuzana 1,
Častorálová Markéta 2,
Helebrant Aleš 1, |
1 Department of Glass and Ceramics, Faculty of Chemical Technology,
Institute of Chemical Technology Prague, Technická 5, 166 28 Prague, Czech Republic
2 Department of Biochemistry and Microbiology, Faculty of Food and Biochemical Technology,
Institute of Chemical Technology Prague, Technická 3, 166 28 Prague, Czech Republic
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Keywords: Sol-gel coating, Titanium substrate, Adhesion, Tape test, In vitro test, Bioactivity |
The objective of the submitted work was to prepare and to characterize two types of silicate coatings prepared by the sol-gel
method using the dip-coating technique on a titanium substrate. Efforts have been made to use mechanical properties of
bio-inert titanium and bioactive properties of a silicate layer enriched with an admixture of compounds identified below.
The first group consisted of silicate coatings containing silver, brushite and monetite. The other group of silicate coatings
contained calcium nitrate and triethyl phosphate. Mechanically and chemically treated titanium substrates were dipped into
sols and dried and fired. Silicate coatings from the first group were also chemically treated in 10 mol.l-1 solution of sodium
hydroxide. All coatings were measured to determine their adhesive and bioactive properties and furthermore the antibacterial
properties were tested in the case of first group. Surfaces of the coated substrates were investigated after the firing and after
the individual tests with optical and electron microscopy and X-ray microdiffraction. A tape test demonstrated excellent
adhesive property of all coatings to the substrate, classified with degree 5. A static in vitro test demonstrated bioactivity of
nearly all the coatings. The basic silicate coating from the first group and one type of coating from the second group were
identified as inert. Antibacterial properties of silicate coatings containing silver showed to be different when tested against
Escherichia coli bacteria. A complete inhibition of the growth of bacteria under our experimental conditions was observed
for the coating containing silver and monetite and a partial inhibition of the growth of bacteria for coatings containing silver
and silver in combination with brushite. |
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