2H NMR evidence for the formation of random mesh phases in nonionic surfactant-water systems

The Journal of Physical Chemistry. B
M BaciuMichael C Holmes

Abstract

Random mesh phases share many common features with the classical lamellar phase in that they are layered phases; but crucially, they possess nonuniform interfacial curvature, since the lamellae are pierced by water-filled pores. The introduction of curvature into the lamellae has been posited as a transitional precursor for other lyotropic phases. In this paper, we show that simple 2H nuclear magnetic resonance (NMR) experiments provide strong indication for the formation of the random mesh phase and the NMR data correlate well with literature results from small-angle X-ray scattering. The thermal evolution of the recorded quadrupolar splitting (DeltanuQ) is monitored within the lamellar phase of two nonionic surfactants, C16E6 and C12E5, as the samples are cooled or heated, and a marked and reversible change in the evolution of DeltanuQ is observed. Data from heavy water and deuterium labeled surfactant show the same temperature dependence and consequently report on the same structural changes with temperature. The formation of the random mesh phase is quantified in terms of an effective order parameter that is unity in the classical lamellar phase and takes values of <1 in the random mesh phase, reaching 0.6 at lower temperat...Continue Reading

References

Jun 25, 2005·The Journal of Chemical Physics·M ImaiT Teramoto

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Citations

Oct 1, 2008·Physical Chemistry Chemical Physics : PCCP·Tiago Mendes FerreiraDaniel Topgaard
Jan 4, 2013·Magnetic Resonance in Chemistry : MRC·Alexis Krupp, Michael Reggelin
Aug 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Santosh Prasad Gupta, V A Raghunathan
Dec 11, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Sanja BulutUlf Olsson
Sep 2, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Zaiwu YuanJingcheng Hao
Apr 9, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·B MedronhoC Schmidt
Sep 20, 2020·Journal of Colloid and Interface Science·Viktoriia Meklesh, Patrick Kékicheff
May 14, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Sajal Kumar Ghosh, V A Raghunathan
Jun 22, 2010·Chemical Reviews·Renhao Dong, Jingcheng Hao
Jan 26, 2011·The Journal of Physical Chemistry. B·N DenhamA V Zvelindovsky
Nov 9, 2007·The Journal of Physical Chemistry. B·Idit Amar-YuliNissim Garti
Jan 26, 2007·The Journal of Physical Chemistry. B·Magdalene BaciuMarc S Leaver
Apr 19, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·B MedronhoU Olsson
Dec 13, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Ying WangAndrew Fogden

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