Back to Search
Start Over
Tail unsaturation tailors the thermodynamics and rheology of a self-assembled sugar-based surfactant
- Source :
- Journal of colloid and interface science 585, 178-183 (2021). doi:10.1016/j.jcis.2020.11.063
- Publication Year :
- 2021
- Publisher :
- Elsevier, 2021.
-
Abstract
- Hypothesis The self-assembly of long-tail surfactants results in the formation of nanoscale structures, e.g. worm-like micelles, with the ability to modify the rheology of the system. However, micelle formation, and thus the alteration of the rheology, is subject to the high Krafft temperature of saturated long-tail surfactants. Hexadecylmaltosides are sustainable surfactants that, in solution, form tailorable viscoelastic fluids. The preparation of monounsaturated sugar-based surfactants is hypothesised to reduce the Krafft point compared to the saturated analogues, therefore increasing the temperature range where the surfactant remains in the micellar form. Experiments Here we report the synthesis and characterisation of a novel sugar-based surfactant with an unsaturated C16-tail, namely palmitoleyl-β- d -maltoside (β-C16-1G2). Differential scanning calorimetry was used to probe the temperature stability of the system. The rheology of β-C16-1G2 solutions was investigated by means of rotational and oscillatory rheology, and these results were connected to the mesoscopic structure of the system as shown by small-angle neutron and X-ray scattering, and dynamic light scattering. Findings The presence of a double bond on the alkyl chain moiety leads to a depression in the Krafft point, allowing the surfactant to form a thermodynamically stable micellar solution over a wide range of temperatures, i.e. 5–95 °C. The surfactant self-assembles into worm-like micelles which, upon entanglement in the semi-dilute regime, result in the formation of a non-Newtonian, viscoelastic fluid. These observations have important implications in the development of new sustainable formulated products, enabling the preparation of surfactant phases with remarkable thermal resilience.
- Subjects :
- chemistry.chemical_classification
Degree of unsaturation
Materials science
Thermodynamics
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Krafft temperature
Micelle
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Biomaterials
Colloid and Surface Chemistry
Differential scanning calorimetry
chemistry
Dynamic light scattering
Pulmonary surfactant
Rheology
ddc:540
0210 nano-technology
Alkyl
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Journal of colloid and interface science 585, 178-183 (2021). doi:10.1016/j.jcis.2020.11.063
- Accession number :
- edsair.doi.dedup.....d75428acf8d7295a187183274ab57c7b
- Full Text :
- https://doi.org/10.1016/j.jcis.2020.11.063