Thermodynamic and surface properties of 4-(Undecyloxy) benzoic acid thermotropic liquid crystal by inverse gas chromatography at infinite dilution

Ozcan S., Tas S., IŞIK B., ÇAKAR F., CANKURTARAN Ö.

Phase Transitions, 2025 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2025
  • Doi Number: 10.1080/01411594.2025.2465591
  • Journal Name: Phase Transitions
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: 4-(Undecyloxy) benzoic acid, chromatography, Flory-Huggins, phase transitions, surface properties
  • Yıldız Technical University Affiliated: Yes

Abstract

This study utilized 4-(Undecyloxy) benzoic acid liquid crystal as the stationary phase. The phase transition temperatures of the liquid crystal were ascertained using inverse gas chromatography. The phase transition temperatures of 4-(Undecyloxy) benzoic acid liquid crystal were established at 70, 88, 96, and 136°C via the inverse gas chromatography method. The Flory-Huggins interaction parameters ((Formula presented.)) and mole fraction activity coefficients ((Formula presented.)) were derived, and the interactions between the liquid crystal-solvent in the thermodynamic domain were examined. Furthermore, the dispersive surface energy ((Formula presented.)) was determined. The (Formula presented.) values ranged from 40.31 to 56.67 mJ/m2 according to the Dorris-Gray method, and from 38.83 to 52.20 mJ/m2 according to the Schultz methodology. Furthermore, the specific free energy, enthalpy, and entropy of solvents on the liquid crystal were ascertained. The acquired data demonstrated an acidic nature ((Formula presented.)) for the surface of 4-(Undecyloxy) benzoic acid liquid crystal.