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Updated: Jul 6, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Low viscosity reversed hexagonal mesophases induced by hydrophilic additives.
Idit Amar-Yuli1, Ellen Wachtel, Deborah E Shalev
1Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Adding Transcutol or ethanol to glycerol monooleate/tricaprylin/water mixtures creates low viscosity H(II) mesophases at room temperature. These additives induce disorder and enhance surfactant mobility, forming fluid H(II) structures.
Area of Science:
- Materials Science
- Physical Chemistry
- Colloid Science
Background:
- Glycerol monooleate (GMO)/tricaprylin (TAG)/water mixtures form H(II) mesophases at elevated temperatures.
- Understanding factors influencing mesophase formation and properties is crucial for applications.
Purpose of the Study:
- To investigate the effect of Transcutol or ethanol on the formation of H(II) mesophases in a GMO/TAG/water system at room temperature.
- To characterize the microstructure and bulk properties of these room-temperature mesophases.
- To elucidate the role of Transcutol and ethanol as disordering agents and mobility enhancers.
Main Methods:
- Rheology
- Differential Scanning Calorimetry (DSC)
- X-ray Scattering (WAXS and SAXS)
- Nuclear Magnetic Resonance (NMR) spectroscopy (self-diffusion and 2H NMR)
- Fourier Transform Infrared (FTIR) spectroscopy
Main Results:
- Transcutol or ethanol addition induced the formation of less ordered H(II) mesophases with smaller domain sizes and lattice parameters at room temperature (up to 30°C).
- These room-temperature mesophases exhibited properties similar to those of the GMO/TAG/water mixture at elevated temperatures (35-40°C).
- Transcutol and ethanol were identified as agents causing GMO headgroup dehydration and enhanced GMO chain mobility, leading to increased micelle curvature and reduced length.
Conclusions:
- Transcutol and ethanol act as effective inducers for forming fluid H(II) mesophases at room temperature.
- These additives likely increase the curvature of cylindrical micelles by competing for water with GMO headgroups.
- The observed room-temperature H(II) phases may represent a precursor to the H(II)-L(2) transformation occurring at higher temperatures.
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