Back to Search
Start Over
Relationship of rheological and thermal properties in organogel emulsions (W/O): Influence of temperature, time, and surfactant concentration on thermomechanical behavior
- Source :
- Journal of Molecular Liquids. 337:116403
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Emulsions are thermodynamically unstable systems that, by incorporating more components in their formulation, increase their complexity and make their study challenging. However, a good selection of compounds in the formulation, and suitable methods for their preparation, could result in systems with favorable thermomechanical and microstructural properties for multiple applications. The objective of this research was to evaluate the influence of temperature, time, and surfactant concentration on the microstructural, thermodynamic, and rheological properties of organogel emulsions, and to present in a simple way the relationship between enthalpy of fusion and rheological properties (i.e., viscosity) in organogel emulsions W/O. Canola oil, monoglycerides and polyglyceryl polyricinoleate (PGPR) were used as the oil phase. Microscopy, DSC, and Creep-recovery tests were performed. A molecular organization phenomenon was observed that resulted in systems with a more dispersed and ordered microstructure, delaying the phase separation for 28 days of evaluation. In addition, an increase in the internal viscosity of the organogel emulsions was reflected in higher enthalpy of fusion values at 10 °C. An inverse behavior was also presented in emulsions at 25 °C. The combined activity of stabilizing agents, as well as the three-dimensional network formed in continuous phase, avoided phenomena of coalescence and phase separation by keeping distant the drops of water and the oily liquid phase, while leading to a better organized microstructure over time and retaining good rheological properties.
- Subjects :
- Coalescence (physics)
Materials science
Enthalpy of fusion
Multiple applications
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Viscosity
Pulmonary surfactant
Rheology
Chemical engineering
Thermal
Materials Chemistry
Physical and Theoretical Chemistry
0210 nano-technology
Spectroscopy
Subjects
Details
- ISSN :
- 01677322
- Volume :
- 337
- Database :
- OpenAIRE
- Journal :
- Journal of Molecular Liquids
- Accession number :
- edsair.doi...........d5e0c7ac139f15814294ba9939eddb91