Abstract: The phase diagrams showed that for Triton X-100/C₁₀H₂₁OH/H₂O system the lamellar liquid crystals were formed more easily and were more stable than Triton X-100/C₆H₆/H₂O system lamellar liquid crystals. SAXD showed that C₁₀H₂₁OH and Triton X-100 are arranged in turn in the amphipathic-layer of Triton X-100/C₁₀H₂₁OH/H₂O lamellar liquid crystal and that the thickness of the layer d₀ was independent of the weight ratio of C₁₀H₂₁OH to Triton X-100. When C₆H₆ was used instead of C₁₀H₂₁OH as in Triton X-100/C₆H₆/H₂O lamellar liquid crystals,the d₀ values increased with increase of weight ratio of C₆H₆/Triton X-100.

Key words: non-ionic surfactant, lamellar liquid crystal, Triton X-100, solubilization