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Lagoa Santa, Minas Gerais, Brasil.

CERIUM OXIDE

Products on demand

It is composed of nanoparticles functionalized for each application, providing dispersions with adequate particle size distribution and high stability.

main products:
Anticorrosive additive

A solvent-based additive, added into anticorrosive coatings, providing:

• increased corrosion protection
• UV absorption
• Promotes a more effective homogenization

The figure presents metal plates with the additive applied (a) before exposure and (b) after the exposure of 3500 hours to Salt Spray Test showing high efficiency in protection.

Main applications: Protective / anticorrosion Paint.

COATINGS IN COMBUSTION CHAMBERS OF INTERNAL COMBUSTION ENGINES AND TURBINE FINS (EXTERNAL COMBUSTION):

Additive used in the anodizing process of pistons and cylinders liners providing excellent adhesion coating that provides benefits:

• Reduces the Friction & Wear
• Reduces the Corrosion

FUEL OPTIMIZER – NA061103

The Nanum Céria Fuel Optimizer NA061103 is a solvent-based additive for diesel, biodiesel, gasoline, among others. It improves the combustion reaction by making it more efficient, reducing consumption, soot, and other contaminants such as HC, CO and NOx. A study conducted in Scotland with a similar additive on public transport buses for 12 months showed more than 5% decrease in fuel consumption, in addition to reducing emissions of harmful gases to the environment.

Another study conducted in France, comes to the same conclusion, it is estimated that Cerium oxides can decrease up to 80% the emission of gases from combustion engines. Suitable for improving the combustion of Diesel, Biodiesel, Gasoline, Kerosene, Biokerosene and Heavy Oil. It provides the following benefits:

• Prevents carbon impregnation (cleaning)
• Improves efficiency of combustion / reducing consumption
• Reduction of toxic pollutants

Main Application: fuel additive.

LUBRICANT ADDITIVE

The Cerium Oxide nanoparticles developed by Nanum Nanotecnologia can be used as an additive for lubricants used in metal-mechanical applications. The addition of Cerium Oxide nanoparticles results in reduction of friction and wear.

The lubricant on the market that demonstrates the best performance with the addition of nanosized Cerium Oxide particles is Lithium Grease, most used today in aerospace applications and machinery in general.

The Department of Mechanical Engineering, at the Anyang Institute of Technology, China, studied the tribological behavior of lithium-based greases with different levels of Cerium Oxide nanoparticles, also considering the influence of temperature on the tribological properties and compared the grease with and without CeO2 nanoparticles additive.

Results have confirmed that lithium grease with CeO2 nanoparticles present a better friction reduction and wear performance than grease without CeO2 nanoparticles additive, that result a 28% reduction of friction coefficient, in optimal operating condition of 50°C and grease addition of 0.6% of CeO2 nanoparticles additive by weight.

Characteristics of the Grease used in the study:
Density (20 °C): 950 Kg/m3
Spill point: 380°C
Viscosity degree: 3
Kinematic viscosity (40°C): 380 mm2/s

The tribological test of the study was carried out in a Universal Friction and Wear Test Machine MMW-1A (Zhongke Kaihua Technology Development Co., Ltd., Lanzhou, China). According to the study, the upper ball and the three lower fixed ones were all made of GCr15 steel (diameter 12.7 mm and hardness 59~61 HRC). During the test, the upper ball was pressed against the three lower ones (fixed).

Influence of temperature on greases
With the increase in temperature, the hardness of the GCr15 steel tends to decrease, which can lead to an increase of wear of the parts used in the tests. Therefore, there is an optimal temperature for the performance of friction test, that best balances the grease lubricating properties and the hardness of the steel. The best performance was obtained at 50°C.

Results:
During the performance of friction test (at 75°C) with the incorporation of CeO2 nanoparticles to lithium grease, the Ce and O elements overlay on the worn surface of GCr15 steel. It means that occurred the Cerium Oxide is incorporated by adsorption (or deposition) creating a protective surface, reducing the friction and wear of the tribological pairs during the test.

In the study, the particle size of CeO2 used was of 500 nm (maximum). The non-uniform size distribution and irregular morphology of CeO2 increases the probability of smaller and irregular particle formation to fill and repair the worn surface under the grinding action of friction pairs. Particles on a nanoscale can easily adsorb or deposit on the metal surface.

Thus, when CeO2 nanoparticles are added to lithium grease, they can be easily transferred to the metal surface and even to the steel worn area during the friction process. Under lubricating conditions, CeO2 additives can share part of the compression stress and thus form a solid state self-laminated protective film to micro-polish and self-repair the friction surface. The nanoparticles rescan the rough areas and fill the valleys. Therefore, the Ce and O elements could enrich on the worn surface of the materials.

In the study, the average nanoparticles size is 500 nm, while the ones of Nanum range from 5 to 10 nm in size and, when dispersed, reach up to 40 nm, presenting even better results than that of the study in question.

References:
Nanum Technical Team.
Qiang H, Anling L, Yachen G, Songfeng L, Yong Z, Linghao K, Investigation on Tribological Properties of Nanometer Cerium Oxide as Additives in Lithium Grease, Journal of Rare Earths (2017), doi: 10.1016/j.jre.2017.09.004.Chuanli Zhao, Y. K. Chen, & G. Ren, ‘A Study of Tribological Properties of Water-Based Ceria Nanofluids’, Tribology Transactions, Vol. 56 (2): 275-283, January 2013.Pena-Paras, L., Maldonado-Cortes, D., Taha-Tijerina, J., Irigoyen, M., & Guerra, J. (2018). Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures. En IOP Conference Series: Materials Science and Engineering (7 ed., Vol. 400). [072003] (IOP Conference Series: Materials Science and Engineering). Institute of Physics Publishing. https://doi.org/10.1088/1757-899X/400/7/072003Wu, L., Lei, X., Zhang, Y. et al. The Tribological Mechanism of Cerium Oxide Nanoparticles as Lubricant Additive of Poly-Alpha Olefin. Tribol Lett 68, 101 (2020). https://doi.org/10.1007/s11249-020-01340-7
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We have product lines focused on the security printing market:

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