Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/105626
Title: Elucidating the effect of additives on the alkyl chain packing of a double tail cationic surfactant
Authors: Miguel, M. G.
Gonçalves, Rui A.
Lindman, B.
Iwata, T.
Lam, Yeng Ming
Keywords: Additives
DODAC
Science::Chemistry::Physical chemistry::Colloids
Issue Date: 2018
Source: Gonçalves, R. A., Lindman, B., Miguel, M. G., Iwata, T., & Lam, Y. M. (2018). Elucidating the effect of additives on the alkyl chain packing of a double tail cationic surfactant. Journal of Colloid and Interface Science, 528, 400-409. doi:10.1016/j.jcis.2018.05.092
Series/Report no.: Journal of Colloid and Interface Science
Abstract: Hypothesis: Some low molecular weight additives can strongly influence the phase behavior of aqueous surfactant systems, and this offers an important handle to control the properties of surfactant solutions and thus to optimize various formulations concerning stability and performance. Experiments: The surfactant dioctadecyldimethylammonium chloride (DODAC) self-assembles into two lamellar phases in water, the gel phase (Lβ) and the liquid crystalline phase (Lα). Here, we present approaches to tune the gel-to-liquid crystalline transition temperature (Tm) with the use of additives. The effects of urea, sodium butyrate and butyric acid on the packing behavior of DODAC were determined. The surfactant phases were characterized using polarized optical microscopy (POM), differential scanning calorimetry (DSC), and small/wide angle X-ray scattering (SWAXS). Findings: Added urea, sodium butyrate and butyric acid yield a single and stable lamellar phase. Whereas urea and sodium butyrate have only minor effects on Tm, butyric acid gives a large decrease, thus stabilizing the Lα phase with respect to the Lβ phase. From the bilayer thickness of the gel phase an interdigitated or tilted packing of the surfactant molecules is indicated. Addition of sodium butyrate gives a strongly interdigitated gel structure and a transition from lamellar liquid crystal to an isotropic L3 phase.
URI: https://hdl.handle.net/10356/105626
http://hdl.handle.net/10220/50259
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2018.05.092
Rights: © 2018 Elsevier. All rights reserved. This paper was published in Journal of Colloid and Interface Science and is made available with permission of Elsevier.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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