The Study On Synthesis Of Copper Borate Nanoparticles And Its Ability Of Antifriction

In recent years, the demand has been strong for improvement of the fuel economy of automobile engines. From the standpoint of engine oil formulations, a great deal of research effort has been devoted to the development of effective fuel-saving type lubricants and friction reduction by friction modifiers. Simultaneously, modifying the antiwear and lubricating property of material has an important effect on the saving of resources and environmental protection. It not only satisfies the tendency of higher speed, heavier load and higher accuracy of the machine demanded by modern scientific technology, but also lengthens the life of the machine. In this paper, we have focused on the control of the size and shape of nanoparticles by developing effective synthetic techniques of nanoparticles and copper borate nanoparticles. There are many valuable and innovative onclusions through systemic studies.Nanoparticles have many special properties,such as small particle size, high surface activity and high surface energy, which make them apply in extensive field. At present, as additives of lubricant nanoparticles arouse many researchers'interest. How to improve the stability and solubility of nanopaticles is the hot issue in the field of materials science. Now many kinds of nanoparticles have been prepared and tested as additives of lubricantion. More study on synthesis nanoparticles and applying it into wearing alleviation will be benefit to improve the use of the machine equipment efficiently and longer.The crystal and hydrophobic copper borate (Cu(BO2)2) nanosheets were successfully prepared by a wet method using Na2BB4O7 10H2O and CuSO4 5H2O as raw materials in situ aqueous solution, and oleic acid as the modifying surface agent. Surface energy of copper borate nanoparticles was reduced, and the comparability between copper borate nanoparticles and the base oil was enhanced. Oleic acid is a cheap unsaturation organic acid including carboxyl and C=C double bonds functional groups. It had been found that the as-prepared materials displayed nanosheet morphology with average diameters from 100 nm to 200 nm and the thicknesses about 15 nm. The reaction parameters including the pH of the solution, the mole ratios of Na2B4BO7 10H2O and CuSO4 5H2O and the reaction time played important roles on the formation of the hydrophobic copper borate. Oleic acid was bonded to copper borate surface with a covalent bond between carboxyl functional groups and hydroxy groups on the surface of copper borate nanoparticles. The presence of the oleic acid on the surface modified copper borate was confirmed by FTIR spectroscopy. The relative contact angle of the hydrophobic copper borate was increased to 112°. Moreover, the friction coefficient of the base oil was decreased by the addition of hydrophobic copper borate nanosheets and the fluctuation of the friction coefficient was very small.In recent years, advanced materials derived from composite particles are of extensive scientific and technological interests due to the ability to potential their properties with developments in nanotechnology. In this regard, nanoparticles with morphologies represent a new type of constructional unit consisting of two dissimilar compositional and structural domains. Such materials should have enhanced physical and chemical properties and a broader range of applications than their single-component counterparts. The structure, size, and composition of these particles can be easily altered in a controllable way to tailor their magnetic, optical, mechanical, thermal, electrical, tribological and catalytic properties. To the best of our knowledge, the synthesis of copper borate/silica nanoparticles has not been reported up to now. Our method involved the direct synthesis of copper borate and silica nanospheres coating was then deposited onto the copper borate surface through a self-assembly process. The as-prepared Cu(BO2)2/SiO2 materials have a rod–like shape with lengths of 1000 nm and diameters of 100 nm. The obtained SiO2 particles have perfect spherical shape with narrow size distribution (average diameters 30 nm).The friction coefficient of the base oil was not decreased by the addition of Cu(BO2)2/SiO2.