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Issue 7, 2013
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Experimental determination of bending rigidity and saddle splay modulus in bicontinuous microemulsions

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Abstract

Elastic properties of surfactant membranes can be described in terms of the bending rigidity κ and the saddle splay modulus [small kappa, Greek, macron]. Phase diagram measurements and neutron scattering experiments allowed the determination of these parameters. Recent simulations showed that the bending rigidity, which is deduced from the characteristic length scales in the microemulsion, is a mixture of [small kappa, Greek, macron] and κ. By combining neutron spin echo (NSE) spectroscopy, small angle neutron scattering (SANS) and phase diagram measurements, we show that also experimentally the different contributions can be separated. For supercritical CO2 microemulsions and bicontinuous microemulsions with additives, the prefactors of the [small kappa, Greek, macron] and κ contributions are determined and compared to those from simulations.

Graphical abstract: Experimental determination of bending rigidity and saddle splay modulus in bicontinuous microemulsions

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Publication details

The article was received on 24 Oct 2012, accepted on 26 Dec 2012 and first published on 10 Jan 2013


Article type: Paper
DOI: 10.1039/C2SM27449C
Citation: Soft Matter, 2013,9, 2308-2313
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    Experimental determination of bending rigidity and saddle splay modulus in bicontinuous microemulsions

    O. Holderer, H. Frielinghaus, M. Monkenbusch, M. Klostermann, T. Sottmann and D. Richter, Soft Matter, 2013, 9, 2308
    DOI: 10.1039/C2SM27449C

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