From monolayers to bilayers: Mesostructural evolution in DDAB/water/tetradecane microemulsions

Maurizio Olla; Armin Semmler; Maura Monduzzi; Stephen T. Hyde

doi:10.1021/jp037961v

From monolayers to bilayers: Mesostructural evolution in DDAB/water/tetradecane microemulsions

Maurizio Olla, Armin Semmler, Maura Monduzzi, Stephen T. Hyde^*

^*Corresponding author for this work

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

9 Citations (Scopus)

Abstract

Small-angle X-ray (SAXS) scattering and ¹⁴N NMR relaxation were determined for microemulsion samples formed from didodecyl dimethylammonium bromide (DDAB), water, and tetradecane to deduce the associated microstructures. The swelling features within the tetradecane microemulsion are unusual compared with those of DDAB/water/alkane analogues formed with shorter n-alkanes: tetradecane-containing microemulsions do not show the characteristic anti-percolation transition seen for the latter microemulsions. Experimental data along tetradecane dilution lines are consistent with a continuous transition from a bilayer to monolayer structure of the surfactant interface. The evolution is topologically complex. It involves the annealing of bilayer punctures that occur on oil dilution. A quantitative model that allows continuous transformation from multihandled bilayers (typical of L₃ sponge mesophases) to multihandled monolayers (typical of microemulsions modeled with shorter chained alkanes) is proposed that well fits the observed behavior.

Original language	English
Pages (from-to)	12833-12841
Number of pages	9
Journal	Journal of Physical Chemistry B
Volume	108
Issue number	34
DOIs	https://doi.org/10.1021/jp037961v
Publication status	Published - 26 Aug 2004

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title = "From monolayers to bilayers: Mesostructural evolution in DDAB/water/tetradecane microemulsions",

abstract = "Small-angle X-ray (SAXS) scattering and 14N NMR relaxation were determined for microemulsion samples formed from didodecyl dimethylammonium bromide (DDAB), water, and tetradecane to deduce the associated microstructures. The swelling features within the tetradecane microemulsion are unusual compared with those of DDAB/water/alkane analogues formed with shorter n-alkanes: tetradecane-containing microemulsions do not show the characteristic anti-percolation transition seen for the latter microemulsions. Experimental data along tetradecane dilution lines are consistent with a continuous transition from a bilayer to monolayer structure of the surfactant interface. The evolution is topologically complex. It involves the annealing of bilayer punctures that occur on oil dilution. A quantitative model that allows continuous transformation from multihandled bilayers (typical of L3 sponge mesophases) to multihandled monolayers (typical of microemulsions modeled with shorter chained alkanes) is proposed that well fits the observed behavior.",

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T2 - Mesostructural evolution in DDAB/water/tetradecane microemulsions

AU - Olla, Maurizio

AU - Semmler, Armin

AU - Monduzzi, Maura

AU - Hyde, Stephen T.

PY - 2004/8/26

Y1 - 2004/8/26

N2 - Small-angle X-ray (SAXS) scattering and 14N NMR relaxation were determined for microemulsion samples formed from didodecyl dimethylammonium bromide (DDAB), water, and tetradecane to deduce the associated microstructures. The swelling features within the tetradecane microemulsion are unusual compared with those of DDAB/water/alkane analogues formed with shorter n-alkanes: tetradecane-containing microemulsions do not show the characteristic anti-percolation transition seen for the latter microemulsions. Experimental data along tetradecane dilution lines are consistent with a continuous transition from a bilayer to monolayer structure of the surfactant interface. The evolution is topologically complex. It involves the annealing of bilayer punctures that occur on oil dilution. A quantitative model that allows continuous transformation from multihandled bilayers (typical of L3 sponge mesophases) to multihandled monolayers (typical of microemulsions modeled with shorter chained alkanes) is proposed that well fits the observed behavior.

AB - Small-angle X-ray (SAXS) scattering and 14N NMR relaxation were determined for microemulsion samples formed from didodecyl dimethylammonium bromide (DDAB), water, and tetradecane to deduce the associated microstructures. The swelling features within the tetradecane microemulsion are unusual compared with those of DDAB/water/alkane analogues formed with shorter n-alkanes: tetradecane-containing microemulsions do not show the characteristic anti-percolation transition seen for the latter microemulsions. Experimental data along tetradecane dilution lines are consistent with a continuous transition from a bilayer to monolayer structure of the surfactant interface. The evolution is topologically complex. It involves the annealing of bilayer punctures that occur on oil dilution. A quantitative model that allows continuous transformation from multihandled bilayers (typical of L3 sponge mesophases) to multihandled monolayers (typical of microemulsions modeled with shorter chained alkanes) is proposed that well fits the observed behavior.

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From monolayers to bilayers: Mesostructural evolution in DDAB/water/tetradecane microemulsions

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