Self-assembly in dilute mixtures of non-ionic and anionic surfactants and rhamnolipid biosurfactant

Jessica Liley, Robert K Thomas, Ian M Tucker, Jordan T Petkov, Paul S Stevebson, Ibrahim M Banat, R Marchant, Michelle Rudden, Ann Terry, Isabelle Gtillo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The self-assembly of dilute aqueous solutions of a ternary surfactant mixture and rhamnolipid biosurfactant/surfactant mixtures has been studied by small angle neutron scattering. In the ternary surfactant mixture of octaethylene glycol monododecyl ether, C12E8, sodium dodecyl 6-benzene sulfonate, LAS, and sodium dioxyethylene monododecyl sulfate, SLES, small globular interacting micelles are observed over the entire composition and concentration range studied. The modelling of the scattering data strongly supports the assumption that the micelle compositions are close to the solution compositions. In the 5-component rhamnolipid/surfactant mixture of the mono-rhamnose, R1, di-rhamnose, R2, rhamnolipids with C12E8/LAS/SLES, globular micelles are observed over much of the concentration and composition range studied. However, for solutions relatively rich in rhamnolipid and LAS, lamellar/micellar coexistence is observed. The transition from globular to more planar structures arises from a synergistic packing in the 5 component mixture. It is not observed in the individual components nor in the ternary C12E8/LAS/SLES mixture at these relatively low concentrations. The results provide an insight into how synergistic packing effects can occur in the solution self-assembly of complex multi-component surfactant mixtures, and give rise to an unexpected evolution in the phase behaviour.
LanguageEnglish
Pages493-503
JournalJournal of Colloid and Interface Science
Volume487
Early online date26 Oct 2016
DOIs
Publication statusE-pub ahead of print - 26 Oct 2016

Fingerprint

Anionic surfactants
Nonionic surfactants
Self assembly
Surface-Active Agents
Micelles
Rhamnose
Chemical analysis
Sodium
Glycols
Phase behavior
Neutron scattering
rhamnolipid
Benzene
Ether
Sulfates
Scattering

Keywords

  • Mixed surfactants
  • Biosurfactants
  • Self-assembly
  • Mixed micelles
  • Small angle neutron scattering

Cite this

Liley, Jessica ; Thomas, Robert K ; Tucker, Ian M ; Petkov, Jordan T ; Stevebson, Paul S ; Banat, Ibrahim M ; Marchant, R ; Rudden, Michelle ; Terry, Ann ; Gtillo, Isabelle. / Self-assembly in dilute mixtures of non-ionic and anionic surfactants and rhamnolipid biosurfactant. In: Journal of Colloid and Interface Science. 2016 ; Vol. 487. pp. 493-503.
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Self-assembly in dilute mixtures of non-ionic and anionic surfactants and rhamnolipid biosurfactant. / Liley, Jessica; Thomas, Robert K; Tucker, Ian M; Petkov, Jordan T; Stevebson, Paul S; Banat, Ibrahim M; Marchant, R; Rudden, Michelle; Terry, Ann; Gtillo, Isabelle.

In: Journal of Colloid and Interface Science, Vol. 487, 26.10.2016, p. 493-503.

Research output: Contribution to journalArticle

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T1 - Self-assembly in dilute mixtures of non-ionic and anionic surfactants and rhamnolipid biosurfactant

AU - Liley, Jessica

AU - Thomas, Robert K

AU - Tucker, Ian M

AU - Petkov, Jordan T

AU - Stevebson, Paul S

AU - Banat, Ibrahim M

AU - Marchant, R

AU - Rudden, Michelle

AU - Terry, Ann

AU - Gtillo, Isabelle

PY - 2016/10/26

Y1 - 2016/10/26

N2 - The self-assembly of dilute aqueous solutions of a ternary surfactant mixture and rhamnolipid biosurfactant/surfactant mixtures has been studied by small angle neutron scattering. In the ternary surfactant mixture of octaethylene glycol monododecyl ether, C12E8, sodium dodecyl 6-benzene sulfonate, LAS, and sodium dioxyethylene monododecyl sulfate, SLES, small globular interacting micelles are observed over the entire composition and concentration range studied. The modelling of the scattering data strongly supports the assumption that the micelle compositions are close to the solution compositions. In the 5-component rhamnolipid/surfactant mixture of the mono-rhamnose, R1, di-rhamnose, R2, rhamnolipids with C12E8/LAS/SLES, globular micelles are observed over much of the concentration and composition range studied. However, for solutions relatively rich in rhamnolipid and LAS, lamellar/micellar coexistence is observed. The transition from globular to more planar structures arises from a synergistic packing in the 5 component mixture. It is not observed in the individual components nor in the ternary C12E8/LAS/SLES mixture at these relatively low concentrations. The results provide an insight into how synergistic packing effects can occur in the solution self-assembly of complex multi-component surfactant mixtures, and give rise to an unexpected evolution in the phase behaviour.

AB - The self-assembly of dilute aqueous solutions of a ternary surfactant mixture and rhamnolipid biosurfactant/surfactant mixtures has been studied by small angle neutron scattering. In the ternary surfactant mixture of octaethylene glycol monododecyl ether, C12E8, sodium dodecyl 6-benzene sulfonate, LAS, and sodium dioxyethylene monododecyl sulfate, SLES, small globular interacting micelles are observed over the entire composition and concentration range studied. The modelling of the scattering data strongly supports the assumption that the micelle compositions are close to the solution compositions. In the 5-component rhamnolipid/surfactant mixture of the mono-rhamnose, R1, di-rhamnose, R2, rhamnolipids with C12E8/LAS/SLES, globular micelles are observed over much of the concentration and composition range studied. However, for solutions relatively rich in rhamnolipid and LAS, lamellar/micellar coexistence is observed. The transition from globular to more planar structures arises from a synergistic packing in the 5 component mixture. It is not observed in the individual components nor in the ternary C12E8/LAS/SLES mixture at these relatively low concentrations. The results provide an insight into how synergistic packing effects can occur in the solution self-assembly of complex multi-component surfactant mixtures, and give rise to an unexpected evolution in the phase behaviour.

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KW - Self-assembly

KW - Mixed micelles

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JF - Journal of Colloid and Interface Science

SN - 0021-9797

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