Abstract
Lithium silicate particles were prepared by the sol–gel process based on the Stober method using tetraethoxysilane and lithium ethoxide as starting materials; lithium dodecyl sulfate (LDS) was used as a surfactant. Lithium ion concentration of the obtained particles increased with an increase of Li/Si ratios from 1 to 4. Scanning electron microscope images showed that the obtained particles were rather monodispersed with diameter of 100–300 nm, and the particle size was not influenced by the amount of added LDS but the Li/Si ratios. Fourier-transform infrared spectra of the particles showed that the intensity of the peaks due to CO32− increased with an increase of the Li/Si ratios. X-ray diffraction patterns and 29Si magic-angle spinning-nuclear magnetic resonance spectra of the particles indicated that Q3 and Q2 units were present as amorphous state in the particles prepared with Li/Si ratios of 1 and 2, respectively. In the case of Li/Si ratios of more than 3, lithium metasilicate crystals formed, and Q1 and Q2 units were dominant.
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