Effect of ethoxylation and lauryl alcohol on the self-assembly of sodium laurylsulfate: Significant structural and rheological transformation

被引:6
作者
Ade-Browne, Chandra [1 ]
Mirzamani, Marzieh [1 ]
Dawn, Arnab [1 ]
Qian, Shuo [2 ]
Thompson, Ryan G. [3 ]
Glenn, Robert W. [3 ]
Kumari, Harshita [1 ]
机构
[1] James Winkle Coll Pharm, 231 Albert Sabin Way, Cincinnati, OH 45267 USA
[2] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA
[3] Procter & Gamble, Dept Res & Dev, Cincinnati, OH 45040 USA
关键词
Micelle; Self-assembly; Ethoxylation; Lauryl alcohol; Small-angle neutron scattering; Rheology; ANGLE NEUTRON-SCATTERING; LYOTROPIC LAMELLAR PHASES; DODECYL-SULFATE; SURFACTANT MICELLES; SKIN IRRITATION; SANS; TEMPERATURE; GROWTH; WATER; SDS;
D O I
10.1016/j.colsurfa.2020.124704
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Fatty alcohols are added to the surfactant solutions to modify foaming and lubrication properties, while the degree of ethoxylation is increased to improve mildness to the skin. However, it is envisioned that both parameters are capable of manipulating rheological and morphological properties. Therefore, an efficient control over the carbon chain length, amount of fatty alcohol and degree of ethoxylation could modify the surfactant self-assembly in an unprecedented way. The present work is focused on understanding the structural transformation, intermolecular interactions and rheological properties of the colloidal systems containing various amounts of lauryl alcohol (LA), and surfactant with varying degrees of ethoxylation. Combined small-angle neutron scattering (SANS), nuclear magnetic resonance (NMR) spectroscopy, rheological and morphological studies were performed to elucidate these properties. The results reveal that an increase in LA content increases the system viscosity ultimately forming a gel, and drives the assembly pattern of the surfactant from ellipsoidal micellar to lamellar via a vesicular and vesicular/lamellar mixed intermediates. On the other hand, higher degrees of ethoxylation delay the onset of morphological transformation and gel formation. The interplay between hydrophobic and polar interactions coupled with hydrogen bonding interactions drive the overall rheological and morphological transformations. Therefore, fine-tuning residual chemicals can offer a novel tool for optimization of the product formulation.
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页数:11
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