TY - JOUR
T1 - Oleogels from glycerol-based lyotropic liquid crystals
T2 - Phase diagrams and structural characterization
AU - Cegla-Nemirovsky, Yael
AU - Aserin, Abraham
AU - Garti, Nissim
N1 - Publisher Copyright:
© AOCS 2015.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - In the course of our studies on structured reverse lyotropic liquid crystals (LLC) as oleogels, a system was designed with the desired physical and rheology properties for cosmetic and pharmaceutical applications. The aqueous phase was partially replaced by glycerol to minimize bacteriological problems and obtain specific rheology characteristics. The constructed phase diagrams are based on ternary mixtures of glycerol monooleate (GMO), decane, water, and glycerol. The main lyotropic mesophase obtained in this study was reverse hexagonal derived from dilution line 8:2 (72 wt% GMO and 18 wt% decane) and 10 wt% water; or water:glycerol (wt ratios 3:1 and 1:1) mixture. It was found that heat-cool fluctuation caused formation of new pseudo-equilibrium structures with mesomorphic transformations to more fluid and less ordered mesostructures. Replacing up to 50 wt% of the water by glycerol significantly increases the gel phase region in the phase diagram, meaning more structural compositional options. The structural parameters were determined using cross-polarized light microscopy (CPLM), differential scanning calorimeter (DSC), powder X-ray diffraction (PXRD), and small angle X-ray scattering (SAXS). Rheological measurements revealed viscoelastic properties of lyotropic liquid crystals with a decrease in the elasticity (G′), plasticity (G″), and complex viscosity (η∗), as a function of increasing the glycerol content.
AB - In the course of our studies on structured reverse lyotropic liquid crystals (LLC) as oleogels, a system was designed with the desired physical and rheology properties for cosmetic and pharmaceutical applications. The aqueous phase was partially replaced by glycerol to minimize bacteriological problems and obtain specific rheology characteristics. The constructed phase diagrams are based on ternary mixtures of glycerol monooleate (GMO), decane, water, and glycerol. The main lyotropic mesophase obtained in this study was reverse hexagonal derived from dilution line 8:2 (72 wt% GMO and 18 wt% decane) and 10 wt% water; or water:glycerol (wt ratios 3:1 and 1:1) mixture. It was found that heat-cool fluctuation caused formation of new pseudo-equilibrium structures with mesomorphic transformations to more fluid and less ordered mesostructures. Replacing up to 50 wt% of the water by glycerol significantly increases the gel phase region in the phase diagram, meaning more structural compositional options. The structural parameters were determined using cross-polarized light microscopy (CPLM), differential scanning calorimeter (DSC), powder X-ray diffraction (PXRD), and small angle X-ray scattering (SAXS). Rheological measurements revealed viscoelastic properties of lyotropic liquid crystals with a decrease in the elasticity (G′), plasticity (G″), and complex viscosity (η∗), as a function of increasing the glycerol content.
KW - DSC
KW - Monoolein
KW - Pseudoternary phase diagrams
KW - Reverse hexagonal mesophases
KW - Rheology
KW - SAXS
UR - http://www.scopus.com/inward/record.url?scp=85027955368&partnerID=8YFLogxK
U2 - 10.1007/s11746-015-2594-7
DO - 10.1007/s11746-015-2594-7
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AN - SCOPUS:85027955368
SN - 0003-021X
VL - 92
SP - 439
EP - 447
JO - JAOCS, Journal of the American Oil Chemists' Society
JF - JAOCS, Journal of the American Oil Chemists' Society
IS - 3
ER -