Dissertation
Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Study on the Dispersion of Nano-sized CaCO3 in the Aqueous System and Its Mechanism

Author LiangWenYu
Tutor GeMingQiao
School Jiangnan University
Course Textile Engineering
Keywords Nano-CaCO3 Water Dispersion Stable Adsorption Mechanism Metal ion
CLC TB383.1
Type Master's thesis
Year 2008
Downloads 230
Quotes 3
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In order to achieve the nano-CaCO 3 provisioned in textile applications, by adding the dispersant and ultrasonic action method nano CaCO 3 aqueous dispersion system, depth of nano CaCO 3 in water dispersion mechanism, and to determine the better dispersion conditions, to lay the foundation for nano CaCO 3 aqueous textile materials. Initial choice of sodium polyphosphate (SPP), sodium hexametaphosphate (SHMP), sodium dodecyl benzene sulfonate (SDBS), cetyltrimethylammonium bromide (CTAB), polyvinyl alcohol (PEG400) soil temperature 80 (Tween 80), nonylphenol polyoxyethylene ether (OP-10) and sodium polyacrylate (PAANa) several common dispersant, through the visual test nano-CaCO 3 particle size and dispersion stability of the system, and ultimately determine the the SDBS most suitable for nano CaCO 3 of dispersant in water. Nanocrystals as a dispersing agent in order to better analysis SDBS Caco 3 mechanism dispersed in water, test SDBS at the nano of CaCO 3 the surface of the amount of adsorption after adsorption SDBS, dispersing the change of the zeta potential, as well as the stability of the adsorbed. The results show that, SDBS adsorbed on nano-CaCO 3 surface adsorption amount With the the SDBS solution concentration increases with increasing concentrations greater than 2g / L, SDBS nano CaCO 3 surface adsorption reached saturation; certain influence of pH on adsorption pH the greater, the smaller the amount of adsorption; nano-CaCO 3 adsorption SDBS dispersion zeta potential changes ; SDBS in Nanometer CaCO 3 surface adsorption is a spontaneous process, the adsorption is relatively stable. Test different ultrasonic, ultrasonic time, the pH value of the amount of dispersant and dispersed system nano CaCO 3 particle size and dispersion stability, combined SDBS nano CaCO 3 Adsorption of the surface of the , using extended DLVO theory discussed nano Caco 3 and the stabilizing mechanism of the dispersion in water to determine the better dispersion of the dispersion conditions. The results showed that, SDBS can be improved by improving the electrostatic repulsion between the particles, the steric hindrance and the membrane hydration effect the nano of CaCO 3 dispersion stability in water; When SDBS amount of 0.5g / L to 2g / L of the range, the pH value of 9 nearby, the role of an ultrasonic cell crusher 10min, nano of CaCO 3 better dispersibility in water, the dispersion is more stable. Finally, the metal ions in the modified system could undermine the stability of the dispersed system, KCl, MgCl 2 and AlCl 3 were added to the dispersion of the prepared observe metal ions on the stability of the dispersions. The results show that the added metal salt of KCl, mM MgCl 2 and the Aluminium from AlCl 3 , will destroy the stability of the dispersion system, the stability of the dispersion system with the metal ion concentration increases reduced; of SDBS dosage of metal ions on the destructive capability of the different pH of the dispersion system is the same; under the same conditions, different metal ions on the destructive capability of the dispersion stability of the system is different from the size of the order of the destruction capability Al 3 gt; Mg 2 gt; gt; K ; addition of KCl, SDBS greater the amount of K damaging effects on the stability of the dispersion system more strongly; added MgCl 2 or AlCl 3 of SDBS dosage greater the smaller the damaging effects of metal ions on the stability of the dispersions ; dispersed system was prepared, according to the end-use conditions of the dispersion system, to determine the dosage of SDBS.

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