After oxygen, silicon (Si) is the second most abundant element in the environment and is present as impurity in most of the materials. The widespread occurrence of siliceous biominerals as structural elements in lower plants and animals suggests that Si plays a role in the production and maintenance of connective tissue in higher organisms [1]. It has been shown that Si is necessary in the bones, cartilage and in the formation of the connective tissue, as well as in some important metabolic processes [1]. Additionally, well known is that Si participates as SiO2 in the precipitation of apatite layers on bio-active glasses.

Polysilicon layers are deposited on glass substrates by subsequent or simultaneous RF magnetron sputtering of Al and a-Si in vacuum and as a result Si nanocrystallites are formed. The as-patterned surfaces are tested in terms of their reactivity towards inducing hydroxyapatite (HA) formation from simulated body fluid (SBF) by applying a method of laser-liquid-solid interaction (LLSI). Subsequently the samples are left in the same SBF in which they are irradiated with the laser for 4 hours. The grown structures are analyzed by SEM, LM, EDX, XRD, FTIR and Raman Spectroscopy.

Keywords
Hydroxyapatite, patterned surfaces, polysilicon, laser-liquid-solid interaction, simulated body fluid

References
[1]. D. Evered, M. O’Connor, Silicon Biochemistry, CIBA Foundation Symposium 121, Wiley&Sons Ltd., London, 1986

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