| Abstract [eng] |
For the first time the calcium hydroxyapatite thin films were fabricated at a sufficiently low temperature applying environmentally friendly sol-gel using the spin-coating technique and dissolution-precipitation synthesis methods on Si substrate. This low-temperature synthetic approach was also developed for the fabrication of calcium hydroxyapatite coatings on Ti substrate. The result is a nearly single phase CHAp with negligible amount of side phases. The effects of various organic solvents and solvothermal conditions on the formation of calcium hydroxyapatite via hydrolysis of α-tricalcium phosphate were investigated. The morphology of the obtained CDHA samples could be changed from plate-shaped to rod-shaped. The ethylene glycol had the highest impact on the sample morphology. Moreover, the effects of sodium lauryl sulphate and various amino acids (DL-aspartic acid, dodecanedioic acid, suberic acid) on the formation and morphological properties of calcium hydroxyapatite have been also estimated. The nature and the concentration of organic additives influence the phase purity and morphology of the final CDHA specimens. Higher concentrations of sodium lauryl sulphate and dodecanedioic acid induce the formation of impurities, while aspartic and suberic acid do not affect the phase purity. The morphology of the samples could be changed from plate-shaped to rod-shaped. |
