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Thixotropic Organogels Based on a Simple N -Hydroxyalkyl Amide: Rheological and Aging Properties

2004; American Chemical Society; Volume: 20; Issue: 8 Linguagem: Inglês

10.1021/la035219g

1520-5827

Marion Lescanne, Pauline Grondin, Anthony D’Aléo, Fréderic Fagès, Jean‐Luc Pozzo, O. Mondain Monval, Pierre Reinheimer, Annie Colin,

Food Chemistry and Fat Analysis

The thixotropic properties ofthermoreversible organogels composed ofN-3-hydroxypropyl dodecanamide and various apolar fluids have been investigated by X-ray scattering, light microscopy, and rheo-optics experiments. This revealed that gel formation occurs via a precipitation process. Depending upon the cooling rate, large interconnected aggregates are formed and induce an elastic behavior. When submitted to a shear flow, these aggregates disentangled and became aligned in the direction of the velocity. Nevertheless, shear does not alter the structure of the individual aggregate and connections between the aggregates are quickly rebuilt due to gravity and thermal fluctuations when the applied flow is stopped. The alignment under flow and the reformation of the connections after the cessation of the shear induces the thixotropic behavior.