Abstract:

An important application of psudo ternary phase diagrams is to obtain microemulsion for nano material preparation. Therefore, psudo ternary phase diagrams of sodium dodecyl sulfate(SDS)/n-C₅H₁₁OH-cyclohexane-water at 45 ℃ and its conductivity were studied. Pseudo ternary phase diagrams agree well with conductivity measurement. Then psudo ternary phase diagrams of SDS/n-C₅H₁₁OH-cyclohexane-water, SDS/n-C₅H₁₁OH-cyclohexane-Zn(NO₃)₂, SDS/n-C₅H₁₁OH-cyclohexane-NaOH at 45 ℃ and 65 ℃ were measured and compared. The influence of alkali NaOH and salt Zn(NO₃)₂ on peudo ternary phase diagrams was discussed. The result shows that oil-in-water(O/W) and water-in-oil(W/O) microemulsion areas are smaller after (Zn(NO₃)₂) or (NaOH) was added into SDS/n-C₅H₁₁OH-cyclohexane-water system. The O/W microemulsion areas disappeared in SDS/n-C₅H₁₁OH-cyclohexane-NaOH peudo ternary phase diagrams at 45 ℃. There are still 5 areas in psudo ternary phase diagrams and smaller O/W and W/O microemulsion areas after NaOH or Zn(NO₃)₂ was added in SDS/cyclohexane-water system at 65 ℃. These study results were applied in the preparation nano ZnO particle in microemulsion system. Tansimission electron microscopy and X-ray diffraction studies show that the sample preparaed by the guidance of psudo ternary phase diagrams is nano ZnO particle.

Key words: peudo ternary phase diagrams, nanoparticle, water-in-oil microemulsion, alkali, salt