Surfactant Lyotropic Preparation And Tribological Properties Of Liquid Crystal Nanoparticles

The region and stability of the lamellar liquid crystal in Triton X-100/n-C10H21OH/H2O system is decrease by repacing water with sodium hydrogen tartrate, ethylenediaminetetraacetic acid disodium salt, calcium lactate, silver nitrate and sodium sulfide aqueous solution. The small X-ray diffraction measurement indicates that the thickness of the solvent layer in the lamellar liquid crystal is less than 3 nm. The solvent layer is composed of hydrophilic PEO chain and water. The solvent mostly exists in such a hydrophilic microdomain. Based on the penetration of water in the solvent layer into the amphiphile bilayer of lamellar liquid crystal and the limitation of the thickness of the solvent layer in the lamellar liquid crystal, a series of inorganic and organic nanoparticles, ethylenediaminetetraacetic acid disodium salt (C10H14N2O8Na2), sodium hydrogen tartrate (C4H5O6Na), calcium lactate (C6H10CaO6) and silver sulfide (Ag2S) nanoparticles were prepared using lamellar liquid crystal as templates. The particle size is about 2 ~ 6 nm with relatively narrow distribution. The composition of the lamellar liquid crystal has little effect on the particle size.The properties and applications of nanoparticles are affected by its stability and aggregation property, which is related to the surface property of nanoparticles. In sodium hydrogen tartrate sol, the size of sodium hydrogen tartrate nanoparticles increases with the concentration of CaCl2. Under the same conditions, compared with alkaline earth metal ions, the size of sodium hydrogen tartrate nanoparticles increases obviously with the concentration of transition metal ions. Alkaline earth metal ions diffuse into the double layer of nanoparticles by electrostaticstatic interaction. Transition metals ions diffuse into the double layer not only by electrostaticstatic interaction but also by complexation. The UV spectra show that the surfaces adsorption of metallic nanoparticles leads to the aggregation of nanoparticles and the increase inthe adsorption intensity of Triton X-100, which confirms the result of TEM. The conductometry indicates sodium hydrogen tartrate, ethylenediaminetetraacetic acid disodium salt, calcium lactate and silver sulfide nanoparticles represent strong electrolyte behavior in dilute solution.The lamellar liquid crystal has lubrication properties on aluminum alloy surface because of its particular lamellar structure. The wear scar width of alloy of LLC increases with the solvent content in the lamellar liquid crystal and decreases with the content of Triton X-100 in the lamellar liquid crystal. Compared with the wear scar width of block lubricated by lamellar liquid crystal, it shows the wear scar width of block lubricated by LLC/nanoparticles mixed system reduces remarkably. The exists of nanoparticles in the lamellar liquid crystal can improves the anti-wear properties of the system. The anti-wear properties of LLC/ inorganic nanoparticles mixed system is obvious affected by the solvent content and less affected by the content of Triton X-100 in the lamellar liquid crystal than LLC/ organic nanoparticles mixed system. The lubrication film formed by nanoparticles improves the anti-wear properties.