Biomineralization capability of adherent bio-glass films prepared by magnetron sputtering

Abstract

Radiofrequency magnetron sputtering deposition at low temperature (150 degrees C) was used to deposit bioactive glass coatings onto titanium substrates. Three different working atmospheres were used: Ar 100%, Ar + 7%O(2), and Ar + 20%O(2). The preliminary adhesion tests (pull-out) produced excellent adhesion values (approximately 75 MPa) for the as-deposited bio-glass films. Bioactivity tests in simulated body fluid were carried out for 30 days. SEM-EDS, XRD and FTIR measurements were performed. The tests clearly showed strong bioactive features for all the prepared films. The best biomineralization capability, expressed by the thickest chemically grown carbonated hydroxyapatite layer, was obtained for the bio-glass coating sputtered in a reactive atmosphere with 7% O(2).

Bioglass implant-coating interactions in synthetic physiological fluids with varying degrees of biomimicry

“…This procedure has proven to assure good target consistency during the prolonged sputtering processes. 32,35 Here, we introduce a simple route of producing BG films with different contents of silica/degrees of polymerization, starting from the same base material. High-purity fused silica plates (Präzisions Glas & Optik, Iserlohn, Germany) with a surface area of 100 mm 2 (this case) were fixed in the "racetrack" region (area where the most intensive sputtering phenomena occur, due to the high density of magnetron plasma, consequently leading to maximal erosion) of the BG target ( Figure 1).…”

Synthesis and in vitro bioactivity assessment of injectable bioglass−organic pastes for bone tissue repair

“…In the last few years, an effort has been made to design and to process bioactive glasses in the CaO-MgO-SiO 2 system aiming at their applications in human biomedicine [14][15][16][17][18]. The glass compositions were selected in the primary crystallization field of pseudo-wollasotine phase in the ternary CaOMgO-SiO 2 diagram doped with P 2 O 5 , Na 2 O, CaF 2 and B 2 O 3 in order to obtain glasses with their silicate glass network being dominated by Q 2 (Si) species [19][20][21].…”

Preferential sputtering in phosphate glass systems for the processing of bioactive coatings

“…A theory presented by numerous authors pertains to differential atomic masses leading to extraction of lighter ions by the vacuum system [17,21,48]. Whilst this theory may have apparent support using a simple Ca/P structure containing only two elements this is not supported by the results presented by Stan et al [25][26][27][28]37] or the results presented here, in which additional ions added such as Na and Mg with respective masses of 22.99 g mol − 1 and 24.31 g mol − 1 consistently maintained greater sputtering yields than phosphorous with a higher mass of 30.97 g mol −1 .…”

“…When bombarded with charged argon particles, atoms are preferentially ejected from a glass structure [25][26][27][28][29]37] a relationship termed relative sputtering yield. Sputtering yields are defined as the number of sputtered atoms/incident energetic ions; however, in relative terms, this refers to differential sputtering rates for individual elements, or elements within a compound.…”