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Small-Angle Neutron Scattering Insights into 2-Ethylhexyl Laurate: A Remarkable Bioester.

Oliver S Hammond1,2, Daniel C Morris3, Guillaume Bousrez1,2

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ACS Sustainable Chemistry & Engineering
|February 9, 2024
PubMed
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This study reveals that the biodegradable bioester 2-ethylhexyl laurate (2-EHL) self-assembles into structures, acting as a nonionic surfactant. This self-assembly explains its emolliency and lubricity in sustainable bio-oils.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Sustainable Chemistry

Background:

  • The bioester 2-ethylhexyl laurate (2-EHL) is a "green" and biodegradable compound.
  • Its emolliency and lubricity properties suggest potential surfactant behavior.

Purpose of the Study:

  • To investigate the structural properties of 2-EHL.
  • To provide evidence for 2-EHL's function as a nonionic surfactant.
  • To explain the mechanism behind its interfacial adsorption and performance.

Main Methods:

  • Small-angle neutron scattering (SANS) measurements were performed on mixtures of commercial and deuterated 2-EHL.
  • Analysis using a polymer scattering framework to determine structural parameters.
  • Investigation of 2-EHL dispersed in acetonitrile to observe self-assembly.

Main Results:

  • Bulk structuring was observed in 2-EHL mixtures via SANS.
  • Key structural parameters determined: radius of gyration (Rg) of 6.5 Å and Kuhn length of 11.2 Å.
  • Self-assembled structures exceeding molecular dimensions were observed in acetonitrile, with an aggregation number (Nagg) of 3.5 ± 0.2.

Conclusions:

  • 2-EHL exhibits structural evidence supporting its function as a nonionic (co)surfactant.
  • Self-assembly of 2-EHL explains its interfacial adsorption, leading to emolliency and lubricity.
  • These findings highlight 2-EHL as a sustainable ester with valuable surfactant-like properties.