Dunfield D, Sayer M, Shurvell H F
Departments of Physics and Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6.
J Phys Chem B. 2005 Oct 27;109(42):19579-83. doi: 10.1021/jp0519823.
Bioceramics based on silicon stabilized tricalcium phosphate [Si-TCP] have been investigated by attenuated total reflection infrared spectroscopy using an experimental preparation that ensures consistent high-quality spectral data. Phase normalized measurements show that changes in OH bands are primarily due to a decrease in the hydroxyapatite content; however, a band at 945 cm(-1) associated with dehydration of the apatite is visible and correlated with silicon doping. Changes in absorption bands with Si content associated with PO(4)(3-) differ for SiO(2) doping levels less than and greater than 0.2 mol of SiO(2)/mol of HA as the amount of Si-TCP phase saturates. Increased resolution allows the study of weak bands linked to Si at 668, 800, 863, and 892 cm(-1) and suggests that the loss of PO(4)(3-) coincides with the development of different silicate groups-SiO(4) at lower doping levels and a new silicon species at higher doping.
基于硅稳定磷酸三钙[Si-TCP]的生物陶瓷已通过衰减全反射红外光谱法进行研究，采用的实验制备方法可确保获得一致的高质量光谱数据。相归一化测量表明，OH带的变化主要是由于羟基磷灰石含量的降低；然而，与磷灰石脱水相关的945 cm(-1)处的谱带是可见的，并且与硅掺杂相关。随着Si-TCP相饱和，当SiO₂掺杂水平小于和大于0.2 mol SiO₂/mol HA时，与PO₄³⁻相关的吸收带随Si含量的变化有所不同。分辨率的提高使得能够研究与Si相关的位于668、800、863和892 cm(-1)处的弱谱带，并表明PO₄³⁻的损失与不同硅酸盐基团的形成相吻合——在较低掺杂水平下为SiO₄，在较高掺杂水平下为一种新的硅物种。
