Dispersion Properties of Nano-SiO2 under Single and Combined Actions of Sodium Hex Metaphosphate and Polycarboxylate Superplasticizer

Yao Qun Xu; Shu Guang Li; Tao Ji; Gai Xin Chen

doi:10.4028/www.scientific.net/MSF.956.352

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HomeMaterials Science ForumMaterials Science Forum Vol. 956Dispersion Properties of Nano-SiO2 under Single...

Dispersion Properties of Nano-SiO₂ under Single and Combined Actions of Sodium Hex Metaphosphate and Polycarboxylate Superplasticizer

Abstract:

Separate and combined effects of sodium hex metaphosphate (SHMP) and polycarboxylate superplasticizer (PCS) of different dosages (0.5%, 1%, 1.5%, and 2%) on the dispersion stability of nanoSiO₂ (NS) were studied. The effect of the dispersant was characterized by the change of absorbance. When SHMP and PCS were used separately and in combination, the stability of nanoSiO₂ dispersions was compared and the optimal amount of dispersant for different dosage of nanoSiO₂ dispersions were summarized. Finally, the mechanism of dispersant compounding was discussed. The results show that with the increase of the concentration, the optimal amount of SHMP increases significantly while the optimal amount of PCS dispersant is lower and better than SHMP. A clear linear relationship between the optimal dosage of SHMP and the concentration of NS could be found. If SHMP is used combined with PCS, the stability of the dispersed NS will increase and the dosages of both dispersants will be reduced.

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Periodical:

Materials Science Forum (Volume 956)

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352-360

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.956.352

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Online since:

June 2019

Authors:

Yao Qun Xu, Shu Guang Li*, Tao Ji, Gai Xin Chen

Keywords:

Absorbance, Dispersant, Nano–SiO₂, Polycarboxylate Superplasticizer, Sodium Hex Metaphosphate

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