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Citation: ZHAO Li-Na, ZHAO Xu, REN Su-Xia, LIU Ying, WANG Zi-Chen. In Situ Synthesis and Surface Modification of Calcium Carbonate[J]. Acta Physico-Chimica Sinica, ;2009, 25(01): 47-52. doi: 10.3866/PKU.WHXB20090109 shu

In Situ Synthesis and Surface Modification of Calcium Carbonate

1.
College of Chemistry, Jilin University, Changchun 130023, P. R. China; 2College of Chemistry, Jilin Normal University, Siping 136000, Jilin Province, P. R. China

Received Date: 25 August 2008
Available Online: 28 November 2008

We prepared hydrophobic calciumcarbonate nanoparticles in situ via the carbonation route with various modifiers such as sodiumstearate (NaSt), octadecyl dihydrogen phosphate (ODP), and oleic acid (OA). The modification of CaCO3 was determined by measuring its active ratio, whiteness and the contact angle. The products were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and transmission electron microscopy (TEM). FT-IR spectra revealed that chemical bond and physical adsorption between modifiers and CaCO3 happened during the modification reaction. The infrared absorption peak of the modified CaCO3 was blue shifted 44 cm-1 compared with the unmodified CaCO3. A preliminary reaction mechanism was discussed in this paper. At a 2%(w(CaCO3)) modifier dosage, the active ratio of CaCO3 as modified by ODP was 99.9%and the whiteness was 97.3%. The contact angle was 122.25° for the CaCO3 modified in the presence of ODP. The theory to support these findings and synthetic methods was presented for these novel materials.
- Calcium carbonate; In situ synthesis; Surface modification
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