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| Titel: |
Behavior of a Metastable Gel of Sodium N-Stearoyl-l-Glutamate/Water System |
| Auteur: |
Koyama, Masako Kaneko, Daisuke Sakamoto, Kazutami |
| Verschenen in: |
Journal of dispersion science and technology |
| Paginering: | Jaargang 29 (2008) nr. 5 pagina's 665-669 |
| Jaar: |
2008-05 |
| Inhoud: |
Gel formation was observed at 25°C in a mono sodium N-stearoylglutamate (C18GS)/water system by quick cooling (quenching, 15°C/minute), whereas coagel was formed by slow cooling (annealing, 1°C/minute). Two kinds of phase transition temperatures, Tgel (coagel-gel) and Tc (gel-liquid crystal or micelle), were detected in the annealing system using a differential scanning calorimeter (DSC). On the other hand, only Tc was observed in the quenching system. Since the phase transition entropies at Tc in both the quenching and annealing systems are similar, both gels are considered to be in the same structure, and the gel observed in the quenching system at low temperature is in the metastable, supercooled state. Judging from the 1H-NMR data and microscopic observation, a homogenous gel is formed above 7 wt% of C18GS. With an increase in surfactant concentration, the thixotropic tendency of the gel increases due to the decrease in free-water. Since it was difficult to show gel formation with the shorter chain homologs, C14GS and C12GS, the hydrocarbon chain length of the surfactant appears to be very important in the formation of a metastable, supercooled gel. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 3 van 26 gevonden artikelen
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