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Effect of surfactant on structure thermal behavior of cetyl stearyl alcohols

DSC and X-ray scattering studies

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Abstract

The thermal behaviors of cetyl (C16OH) and stearyl (C18OH) alcohols, alone or in mixture (C16/18OH), or flooded with water in the absence or presence of cetyl trimetyl ammonium chloride (CTAC), have been investigated using differential scanning calorimetry and X-ray scattering. Additional endothermic temperature transitions were observed at 16.9, 58.8, and 70.7 °C and also an unusual exothermic transition at 63.5 °C, when C16/18OH is in the presence of CTAC. The two first transitions at 16.9 and 58.8 °C seems to be, respectively, linked to the hydration mechanism and the melting of long-chain alcohols, while the exothermic one at 63.5 °C is corresponding to the crystallization of a swollen lamellar phase L β . The crystallized swollen lamellar phase L β melts at 70.7 °C into a L α swollen liquid lamellar mesomorph phase, inducing an endothermic transition. This L β  → L α transition is reversible upon cooling and reheating. Those data are key information to control the dispersion state of swollen lamellar crystals of long-chain alcohols.

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Correspondence to Wunsch Karl.

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Karl, W., Perla, R., Gérard, C. et al. Effect of surfactant on structure thermal behavior of cetyl stearyl alcohols. J Therm Anal Calorim 123, 1411–1417 (2016). https://doi.org/10.1007/s10973-015-5074-2

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  • DOI: https://doi.org/10.1007/s10973-015-5074-2

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