The effect of amphiphilic polymers with a continuous amphiphilicity profile on the membrane properties in a bicontinuous microemulsions studied by neutron scattering

International Conference on Polarised Neutrons for Condensed Matter Investigations

Klemmer, Helge F.M.^1 ; Frielinghaus, Henrich^2 ; Allgaier, Jürgen^3 ; Ohl, Michael^4 ; Holderer, Olaf^2

Department of Chemistry, University of Cologne, Cologne, Germany^1

Jülich Centre for Neutron Science (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Garching, Germany^2

Jülich Centre for Neutron Science JCNS, Institute for Complex Systems ICS, Forschungszentrum Jülich GmbH, Jülich, Germany^3

Jülich Centre for Neutron Science (JCNS), SNS, Forschungszentrum Jülich GmbH, Garching, Germany^4

关键词: Amphiphilic block copolymers;    Amphiphilic polymers;    Bicontinuous microemulsion;    Evaluation software;    Membrane properties;    Microemulsion systems;    Neutron scattering techniques;    Neutron spin echo spectroscopies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/862/1/012014/pdf
DOI  :  10.1088/1742-6596/862/1/012014

来源: IOP

【 摘 要 】

Microemulsion systems consisting of oil, water and surfactant have been studied with neutron scattering techniques. The amount of surfactant needed to form a microemulsion can be dramatically reduced by the addition of small amounts of amphiphilic block copolymers (boosting effect). Here, we studied the influence of block copolymers with gradually changing amphiphilicity from hydrophilic to hydrophobic. Small angle neutron scattering (SANS), neutron spin echo spectroscopy (NSE) and phase diagram measurements in combination give access to the elastic properties of the membrane. The underlying NSE experiments for this interpretation rely on smallest changes of the relaxation curves (of ca. 1% steps) for still small changes of the bending rigidity (of ca. 10% steps). This high reliability of the experiments conducted at the SNS-NSE displays the accuracy of the instrument itself and the latest developments of the evaluation software, which were necessary to interpret such tiny changes of the bending rigidity reliably.