Thermo‐mechanical properties of candelilla wax and dotriacontane organogels in safflower oil |
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Authors: | Juan A Morales‐Rueda Elena Dibildox‐Alvarado Miriam A Charó‐Alonso Richard G Weiss Jorge F Toro‐Vazquez |
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Affiliation: | 1. Universidad Autónoma de Queretaro, DIPA‐PROPAC, Mexico;2. Universidad Autónoma de San Luis Potosí, Facultad de Ciencias Quimicas, Mexico;3. Georgetown University, Department of Chemistry, Washington, USA |
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Abstract: | The thermo‐mechanical properties of organogels developed by a complex mixture of n‐alkanes present in candelilla wax (CW) were investigated and compared with the ones of organogels developed by a pure n‐alkane, dotriacontane (C32). In both cases, the liquid phase used was safflower oil high in triolein (SFO) and the variables studied were two levels of gelator concentration (1 and 3%), cooling rates of 1 and 10 °C/min, and two gel setting temperatures, 5 and 25 °C (Tset). Based on comparisons of the organogels made with C32, the presence of minor molecular components in CW had a profound effect on the crystal habit of the n‐alkanes in CW‐based organogels, and therefore on their physical properties. Thus, independent of the cooling rate and Tset, C32 showed a higher solubility and higher self‐assembly capability in the SFO than CW. Nevertheless, for the same gelator concentration and time‐temperature conditions, C32 organogels had lower G' profiles than CW organogels. Additionally, independent of the type of gelator, more stable organogel structures were developed at Tset = 5 °C and using the lower cooling rate. The rheological behavior of the organogels was explained considering the formation of a rotator phase by the n‐alkanes, its solid‐solid transition, and their dependence as a function of the cooling rate and Tset. The results here obtained showed that it is possible to gelate SFO through organogelation with CW and without the use of trans fats. |
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Keywords: | Organogels Candelilla wax Trans‐free Rheology Hentriacontane |
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