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Published on: March 18, 2020
Physicochemical Analysis of Coacervates and Premicellar Aggregates in Amino Acid-Based Surfactant Systems
Takenaga Hiranuma1,2, Yoshiaki Yamamoto1, Yoshimune Nonomura2
1Cosmetic & Toiletry Group, Research and Development Department, Household Chemicals Division, Kawaken Fine Chemicals Co., Ltd., 2-2-10 Nakadai, Kawagoe 350-1159, JAPAN.
Abstract:
Coacervates are ionic complexes that provide lubrication during hair washing. In this study, hair shampoo models containing amino acid-based surfactants, including sodium lauroyl methylaminopropionate (LMA), were prepared to compare their composition ratios and rheological properties. Mixtures of coacervates and premicellar aggregates precipitated from diluted LMA solutions exhibited viscous behavior. Furthermore, the premicellar aggregates enhanced the shear and strain resistance of the coacervates by forming crosslinks with surfactants and polymers. The use of coacervates and premicellar aggregates represents a new strategy for enhancing product value by providing superior lubrication during hair washing.
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A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...

