生醫材料三鈣矽酸鹽之合成及結構鑑定

莊雅茜

doi:10.6342/NTU.2012.03305

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生醫材料三鈣矽酸鹽之合成及結構鑑定

Synthesis and structural elucidation of tricalcium silicate biomaterials

莊雅茜 , Masters　　Advisor：陳振中　　

繁體中文 DOI： 10.6342/NTU.2012.03305

生醫陶瓷材料；水泥；三鈣矽酸鹽；沉澱法；助熔劑；固態核磁共振； Bioceramic materials ； cement ； tricalcium silicate ； coprecipitation ； fluxing agent ； NMR spectroscopy

Abstract │ Reference (81) │ Altmetrics

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Tricalcium silicate (Ca3SiO5, C3S), the main component of mineral trioxide aggregate (MTA), is a potential dental material because of its favorable sealing ability, bioactivity, and biocompatibility. Pure phase of C3S, however, could only be obtained at 1400 degreeC or above. The requirement of high temperature and the poor compressive strength of C3S are undesirable for its clinical applications. Fluoride ions, as a fluxing reagent, can significantly lower the calcination temperature for C3S formation. In this study, C3S are prepared in the presence of NaF by co-precipitation method. By adding 0 to 2 wt% of NaF, different polymorphs of C3S are obtained from 1100 to 1400 degreeC. At 1400 degreeC, the triclinic phase of C3S is the major product, with or without the addition of fluoride. At a temperature of 1100 to 1250 degreeC, the rhombohedral phase of C3S could be obtained by doping 1 to 2 wt% of NaF. In the absence of fluoride ions, however, only dicalcium silicate (C2S) would be formed. In addition to lowering the formation temperature, the setting time and microhardness of C3S can also be improved by the addition of fluorides.
    The 29Si magic-angle spinning NMR spectra of the rhombohedral C3S show a broad Q0 peak spanning the range from -69 to -75 ppm, whereas there are seven distinct sharp peaks (FWHM ~0.5 ppm) in the same chemical shift range of the Q0 site for the triclinic C3S samples. In other words, the triclinic phase of C3S has significantly higher crystallinity than the rhombohedral phase. Based on a series of 29Si–29Si double-quantum/single-quantum spectra, we have narrowed down the spectral assignments of the resolved seven resonances to two possible scenarios.

Reference ( 81 ) 〈TOP〉

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