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Tribological and antioxidation synergistic effect study of sulfonate-modified nano calcium carbonate.

Zhongyi H, Liping X, Sheng H, Aixi C, Jianwei Q, Xisheng F - PLoS ONE (2013)

Bottom Line: The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load.The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive.The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on.

View Article: PubMed Central - PubMed

Affiliation: School of Basic Science, East China Jiaotong University, Nanchang, PR China. zhongyihe@yahoo.com.cn

ABSTRACT
A middle base number sulphonate-modified nano calcium carbonate (SMC) with an average size of 35 nm was synthesized, and its tribological and antioxidation synergistic behaviors with ashless antioxidant N-phenyl-α-naphthylamine (T531) in hydrogenated oil (5Cst) were evaluated. The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load. The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive. The chemical composition of the rubbing surface which formed on the boundary film was analyzed by using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on. Its ability to increase oxidation free energy of base oil is the main reason for increasing its antioxidant collaboration property with ashless antioxidant T531.

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Freeze-etching electron microscopy (A) and Granularity (B) of SMC.
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pone-0062050-g001: Freeze-etching electron microscopy (A) and Granularity (B) of SMC.

Mentions: The enlarged 100,000 times freeze-etching electron microscopy of synthesized nano calcium carbonate is shown in Figure 1. The SMC shown like flake shape, instead of the ball shape, its size range from 20 to 50 nm, and the weight average particle size is about 35 nm. It is crystallization calcium carbonate, and it has a different from traditional calcium sulphonate product. As a detergent agent, the particle size of CaCO3 should be less than 80 nm [12], otherwise it will cause product to turbid, and the poor colloid stability will affect its using performance. Some research shown that the right particle size of load micelle should be under 20 nm, and uniformly distributed.


Tribological and antioxidation synergistic effect study of sulfonate-modified nano calcium carbonate.

Zhongyi H, Liping X, Sheng H, Aixi C, Jianwei Q, Xisheng F - PLoS ONE (2013)

Freeze-etching electron microscopy (A) and Granularity (B) of SMC.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3643949&req=5

pone-0062050-g001: Freeze-etching electron microscopy (A) and Granularity (B) of SMC.
Mentions: The enlarged 100,000 times freeze-etching electron microscopy of synthesized nano calcium carbonate is shown in Figure 1. The SMC shown like flake shape, instead of the ball shape, its size range from 20 to 50 nm, and the weight average particle size is about 35 nm. It is crystallization calcium carbonate, and it has a different from traditional calcium sulphonate product. As a detergent agent, the particle size of CaCO3 should be less than 80 nm [12], otherwise it will cause product to turbid, and the poor colloid stability will affect its using performance. Some research shown that the right particle size of load micelle should be under 20 nm, and uniformly distributed.

Bottom Line: The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load.The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive.The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on.

View Article: PubMed Central - PubMed

Affiliation: School of Basic Science, East China Jiaotong University, Nanchang, PR China. zhongyihe@yahoo.com.cn

ABSTRACT
A middle base number sulphonate-modified nano calcium carbonate (SMC) with an average size of 35 nm was synthesized, and its tribological and antioxidation synergistic behaviors with ashless antioxidant N-phenyl-α-naphthylamine (T531) in hydrogenated oil (5Cst) were evaluated. The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load. The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive. The chemical composition of the rubbing surface which formed on the boundary film was analyzed by using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on. Its ability to increase oxidation free energy of base oil is the main reason for increasing its antioxidant collaboration property with ashless antioxidant T531.

Show MeSH