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Indeks Forum -> Ogłoszenia -> Linki (strony o Szubinie i inne godne polecenia) -> Bioactivation of biomorphous silicon carbide bone implants 
 Bioactivation of biomorphous silicon carbide bone implants
 Autor: Wiadomość:
01.03.2021 04:07
dingxinda
Pierwsze literki... i cyferki
Pierwsze literki... i cyferki
Grupa: Użytkownicy
Postów: 37
Skąd:
Wood-derived silicon carbide (SiC)silicon carbide suppliers uk offers a specific biomorphous microstructure similar to the cellular pore microstructure of bone. Compared with bioactive ceramics such as calcium phosphate, however, silicon carbide is considered not to induce spontaneous interface bonding to living bone. Bioactivation by chemical treatment of biomorphous silicon carbide was investigated in order to accelerate osseointegration and improve bone bonding ability. Biomorphous SiC was processed from sipo (Entrandrophragma utile) wood by heating in an inert atmosphere and infiltrating the resulting carbon replica with liquid silicon melt at 1450°C. After removing excess silicon by leaching in HF/HNO₃ the biomorphous preform consisted of β-SiC with a small amount (approximately 6wt.%) of unreacted carbon. The preform was again leached in HCl/HNO₃ and finally exposed to CaCl₂ solution. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared analyses proved that oxidation of the residual carbon at the surface induced formation of carboxyl [COO⁻ groups, which triggered adsorption of Ca(2+), as confirmed by XPS and inductively coupled plasma optical emission spectroscopy measurements. www.hslabrasive.comA local increase in Ca(2+) concentration stimulated in vitro precipitation of Ca₅(PO₄)₃OH (HAP) on the silicon carbide preform surface during exposure to simulated body fluid, which indicates a significantly increased bone bonding activity compared with SiC.



     
Indeks Forum -> Ogłoszenia -> Linki (strony o Szubinie i inne godne polecenia) -> Bioactivation of biomorphous silicon carbide bone implants 
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