FFEM gelled complex fluids

Project:

FFEM – Structures of Gelled and Nongelled Complex Fluids

Gelled complex fluids

 

Emulsions, suspensions, liquids, gels, biological samples, etc. can be studied with Freeze Fracture and Etching System EM BAF060.

We use FFEM technique (freeze-fracture electron microscopy) to visualize the structure of binary organogels [1,2], of gelled and nongelled bicontinuous microemulsions [2] as well as of gelled and nongelled lyotropic liquid crystals [3-8].  The aim is to clarify whether gelled complex fluid systems are orthogonal self-assembled systems [2-10]. The systems of choice are:

1) H2O – n-decane – tetraethylene glycol monodecyl ether (C10E4) [2,3];

2) H2O – didodecyldimethylammonium bromide (2-C12DAB) [4];

3) H2O – heptaethylene glycol monododecyl ether (C12E7[5-7];

4) H2O – sodium dodecylsulphate (SDS) – decanol [8],

to which the low molecular weight gelator (LMG) is added.

[1] The Molecular Organogel n-Decane/12-Hydroxyoctadecanoic Acid: Sol-Gel Transition, Rheology, and Microstructure. M. Laupheimer, N. Preisig, C. Stubenrauch, COLSUA, 2015, 469, 315-325.

[2] Gelled bicontinuous microemulsions: a new type of orthogonal self-assembled systems.  M. Laupheimer, Series Springer Theses, Springer: Heidelberg, 2014.

[3] Gelled lyotropic liquid crystals: one more type of orthogonal self-assembled systems. Y. Xu, M. Laupheimer, N. Preisig, T. Sottmann, C. Schmidt, C. Stubenrauch, Langmuir, 2015, 31, 8589-8598.

[4] Gelling Lamellar Phases of the Binary System Water − Didodecyldimethylammonium Bromide with an Organogelator, S. Koitani, S. Dieterich, N. Preisig, K. Aramaki, C. Stubenrauch, Langmuir, 2017, 33, 12171–12179.

[5] The Twofold Role of 12-Hydroxyoctadecanoic Acid (12-HOA) in a Ternary Water—Surfactant—12-HOA System: Gelator and Co-Surfactant. K. Steck, C. Schmidt, C. Stubenrauch, Gels, 4, 78, 2018.

[6] Gelling Lyotropic Liquid Crystals with the Organogelator 1,3:2,4-Dibenzylidene-d-sorbitol Part I: Phase Studies and Sol–Gel Transitions. K. Steck, C. Stubenrauch, Langmuir, 2019, 35, 17132-17141. https://doi.org/10.1021/acs.langmuir.9b01688.

[7] Gelling Lyotropic Liquid Crystals with the Organogelator 1,3:2,4-Dibenzylidene-d-sorbitol Part II: Microstructure. K. Steck, N. Preisig, C. Stubenrauch, Langmuir, 2019, 35, 17142-17149. http://dx.doi.org/10.1021/acs.langmuir.9b03346

[8] Gelation of Lyotropic Liquid-Crystal Phases—The Interplay between Liquid Crystalline Order and Physical Gel Formation. S. Dieterich, T. Sottmann, F. Giesselmann, Langmuir, 2019. https://doi.org/10.1021/acs.langmuir.9b02621.

[9] Studying orthogonal self-assembled systems: phase behaviour and rheology of gelled microemulsions. M. Laupheimer, K. Jovic, F. E. Antunes, M. da Graça Martins Miguel, C. Stubenrauch, Soft Matter, 2013, 9, 3661-3670.

[10] Studying orthogonal self-assembled systems: microstructure of gelled bicontinuous microemulsions. M. Laupheimer, T. Sottmann, R. Schweins, C. Stubenrauch, Soft Matter, 2013, 10, 8744-8757.

 

Contact

Natalie Preisig
Dr.

Natalie Preisig

Scientific Staff

Cosima Stubenrauch
Prof. Dr.

Cosima Stubenrauch

Chairholder, Dean of Faculty

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