Effect of Adding Lecithin and Nonionic Surfactant on α-Gels Based on a Cationic Surfactant-Fatty Alcohol Mixture

Aramaki, Kenji; Matsuura, Yuji; Kawahara, Katsuki; Matsutomo, Daisuke; Konno, Yoshikazu

doi:10.5650/jos.ess20199

Cited by 2 publications

(1 citation statement)

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“…Gelling rivatives 6) ; and synthetic macromolecules such as acrylic acid 7) . α-Gel 8,9) , which is obtained by combining cationic surfactants and higher alcohols, is a hydrogel system widely used in cosmetics, particularly in emulsion systems. However, there are few examples of hydrogels gelatinized using low-molecular-weight gelators.…”

Section: Introductionmentioning

confidence: 99%

Effect of Micellar Shape on Viscoelastic Behavior and Gel Network Structure of Hydrogel Formed by Surfactant-mediated Gelation Using Glutamic-acid-based Organogelator

Ikeda

Aramaki

2023

J. Oleo Sci.

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jjocs agents can be broadly classified into organogelators and hydrogelators, depending on the type of target solvent used. Organogelators for cosmetics include waxes that form card-house structures 2) , and solid oils such as higher fatty acids and higher alcohols; and 12-hydroxystearic acid, which forms supramolecular structures through hydrogen bonding between the hydroxy groups 3) , as a low-molecularweight organogelator 4) . On the other hand, many of the hydrogelators used in skin care creams and aqueous gels in cosmetics are natural polysaccharides, such as agar or xanthan gum, which are covalent polymers 5) ; cellulose de-Abstract: Surfactant-mediated gelation (SMG) is a technique used to form hydrogels by solubilizing waterinsoluble low-molecular-weight organogelators in surfactant micelles. In this study, we investigated the viscoelastic behavior of SMG hydrogels and the effect of micellar shape on their gel network structure using a glutamic acid-based organogelator. Stress-strain curves obtained from static viscoelasticity measurements showed that a wormlike micelle-mediated gel (W-SMG) exhibited a higher stress than a spherical micellemediated gel (S-SMG). From the viscosity-shear rate curve (flow curve), we inferred that the SMG gel exhibited a shear thickening behavior, particularly W-SMG. Microscopic observations revealed that W-SMG formed a denser and more uniform gel network than S-SMG when subjected to strong shearing. W-SMG showed remarkable adhesiveness and a significantly higher tensile normal stress than S-SMG. The storage modulus and loss modulus of W-SMG and the wormlike micellar solution obtained from frequency sweep measurements of the dynamic viscoelasticity were analyzed by Maxwell fitting. The wormlike micellar solution produced a good fit with the single Maxwell model, whereas W-SMG produced the best fit with the generalized Maxwell model comprising two Maxwell elements. From the relaxation time characteristics obtained from the Maxwell model, W-SMG was found to be a viscoelastic material coexisting with a structure having a short relaxation time derived from the gel network and a long relaxation time derived from the wormlike micelle. Under the oscillation strain measured by a rheometer, W-SMG showed a greater normal stress than the wormlike micellar solution, indicating a significant Weissenberg effect.

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