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Water Sol - manufacturing ultrafine particles of iron oxide extraction


Two-phase emulsion the color change, regardless of the phase to phase. More than dirty water phase colorless, turbid organic phase can load phase. Colorless water phase, organic phase and rapid phase cloudy, colorless water phase. More transparent, reddish-brown transparent organic phase quickly. Interface formation, the water phase colorless and transparent. Red-brown transparent organic phase faster, more transparent colorless water phase, reddish-brown transparent organic phase slowly, colorless water phase. Slightly milky, slightly cloudy organic phase is slow compared to mixing water and organic phase compared to turbidity eyelashes. Aqueous cream,[link widoczny dla zalogowanych], organic compared to turbid water sol Fe. O, particles in the surface charge is positive. DBS adsorbed on the non-polar side outwards, leaving Fet0 loss of hydrophilic particles. When the DBS content is low, the surface of iron oxide particles have positive charge is completely covered investment, some particles are still very strong hydrophilic, making the extraction is incomplete. And this both the adsorption of surfactant and have a surplus of positively charged particles on the surface, the water will be adsorbed water molecules into the organic phase, which is caused by emulsification of the reasons. If the excessive amount of DBS, DBS of the double oxide particles as the adsorption. The micelle itself is negatively charged, it will also adsorbed water molecules and water molecules together with the organic phase was transferred to the organic haze. In fact, free of DBS and DBS adsorbed micelles also some iron oxide in water and oil interface orientation distribution and the formation of interfacial film. The status of the two micelles and their condition at the interface, or two-phase water and oil will likely result in separation or emulsification. Organic solvent extraction Fe: O a DBs micelles is intended to provide Fe: O, salt and water in the separation of the sol. Therefore, the iron oxide completely extracted, the extraction phase, and after the good is not loaded organic phase with dissolved 55O334556789 Gao Central Church grave and other water-soluble I win - emulated manufacturing ultra shake grain leather set of 3 iron salt water, is to choose the DBS consumption standards. Can be seen from Table 1, for the purposes of the experiment by adding water sol concentration 5 ~ 6mlBDS solution is appropriate. 2.3BDS iron oxide water with the appropriate amount of the original concentration of glue between Guan DBS micelles and FeO ~ DBs status of micelles and their concentration and concentration, with DBS and Fe: O; particles and their relative concentrations volume related, while salt and water in the sol content. So. In the iron oxide sol and the salt concentration of water is not the same good points to achieve complete phase extraction and the appropriate amount of DBS is different. Table 2 lists some different iron oxide concentration of sol dilution multiple of the appropriate amount of DBS. Table 2 Concentrations of water sol-DBS DBS appropriate dilution of the appropriate dosage amount (m1) 01.51.74B. 55.53. O1.5 Table 2 shows that the higher the concentration of water sol, DBS of the appropriate amount will be. Hydrosol in the amount of iron oxide material and join the DBS in the molar ratio is roughly constant. 2.4 products in the organic solvent dispersion of organic phase, if the load of iron oxide entrainment of the salt, there will be salt in the distillation residue, such products in the organic solvent dispersion will be affected. To do this, check the products in the organic solvent from the dispersion before washing five times with acetone and then washed five times. As a comparison, also examined the product without washing the dispersion. The results are shown in Table 3. Table 3 The iron oxide ultrafine particles dispersed in organic solvents of Table 3, D: No solvent residue, red brown transparent liquid dispersion level 'solvents - not washing after washing the body (well-dispersed); S: slightly turbid solution , D in color and light (part of the dispersion)} N; solvent colorless or slightly staining, after shaking iron oxide precipitation (washout). Table 3 shows the resulting ultra-fine iron oxide in most organic solvents have good dispersion. Even in the ether, butanol and higher water-soluble so strong polar solvents as well. After washing the iron oxide in some dispersion of the solvent decreased, probably due to its non-polar solvents in the dispersion of the already somewhat less certain, after the washing water and acetone, then get rid of a number of DBS, led to scattered of slightly worse than before washing. This phenomenon also suggests another advantage of this process, namely, to separate water and salt. Adding surfactant extraction process, that is the iron oxide surface treatment process.