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

Chandra Ade-Browne; Marzieh Mirzamani; Arnab Dawn; Shuo Qian; Ryan G. Thompson; Robert W. Glenn; Harshita Kumari

doi:10.1016/j.colsurfa.2020.124704

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

Chandra Ade-Browne, Marzieh Mirzamani, Arnab Dawn, Shuo Qian, Ryan G. Thompson, Robert W. Glenn, Harshita Kumari

STS Project Technical Systems

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

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.

Original language	English
Article number	124704
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	595
DOIs	https://doi.org/10.1016/j.colsurfa.2020.124704
State	Published - Jun 20 2020

Funding

The authors would like to thank Drs. Boualem Hammouda, Ron Jones, and Kathleen Weigandt from NIST for helpful advice regarding the SANS data interpretation. This work was primarily supported by start-up funds from University of Cincinnati, OH, USA (HK) and partially by the Procter and Gamble Company Cincinnati, OH, USA (RGT; RWG). Portions of this work were performed as part of the nSoft consortium, including the use of the 10-meter Small-Angle Neutron Scattering instrument. This work benefited from the use of the SasView application, originally developed under NSF award DMR-0520547. SasView contains code developed with funding from the European Union's Horizon 2020 research and innovation program under the SINE2020 project, grant agreement No 654000. This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The Bio-SANS beamline is supported by the Office of Biological and Environmental Research of the U.S. DOE. The authors would like to thank Drs. Boualem Hammouda, Ron Jones, and Kathleen Weigandt from NIST for helpful advice regarding the SANS data interpretation. This work was primarily supported by start-up funds from University of Cincinnati, OH, USA (HK) and partially by the Procter and Gamble Company Cincinnati , OH, USA (RGT; RWG). Portions of this work were performed as part of the nSoft consortium, including the use of the 10-meter Small-Angle Neutron Scattering instrument. This work benefited from the use of the SasView application, originally developed under NSF award DMR-0520547. SasView contains code developed with funding from the European Union's Horizon 2020 research and innovation program under the SINE2020 project , grant agreement No 654000 . This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The Bio-SANS beamline is supported by the Office of Biological and Environmental Research of the U.S. DOE.

Funders	Funder number
DOE Office of Science
European Union's Horizon 2020 research and innovation program	654000
Office of Biological and Environmental Research
U.S. DOE
National Science Foundation	DMR-0520547
National Institute of Standards and Technology
Procter and Gamble
Oak Ridge National Laboratory
University of Cincinnati

Keywords

Ethoxylation
Lauryl alcohol
Micelle
Rheology
Self-assembly
Small-angle neutron scattering

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10.1016/j.colsurfa.2020.124704

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Ade-Browne, C., Mirzamani, M., Dawn, A., Qian, S., Thompson, R. G., Glenn, R. W., & Kumari, H. (2020). Effect of ethoxylation and lauryl alcohol on the self-assembly of sodium laurylsulfate: Significant structural and rheological transformation. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 595, Article 124704. https://doi.org/10.1016/j.colsurfa.2020.124704

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

abstract = "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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Effect of ethoxylation and lauryl alcohol on the self-assembly of sodium laurylsulfate: Significant structural and rheological transformation. / Ade-Browne, Chandra; Mirzamani, Marzieh; Dawn, Arnab et al.
In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 595, 124704, 20.06.2020.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Effect of ethoxylation and lauryl alcohol on the self-assembly of sodium laurylsulfate

T2 - Significant structural and rheological transformation

AU - Ade-Browne, Chandra

AU - Mirzamani, Marzieh

AU - Dawn, Arnab

AU - Qian, Shuo

AU - Thompson, Ryan G.

AU - Glenn, Robert W.

AU - Kumari, Harshita

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

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