Gelled Bicontinuous Microemulsions ― A New Type of Orthogonal Self-assembled Systems

Microemulsions and gels are well-known systems, which play a major role in colloidal and interfacial science. In contrast, the concept of gel microemulsions is still quite new. Gelled microemulsions are highly promising for microemulsion applications in which low viscosity is undesirable, such as administering a drug-delivering microemulsion to a certain area of the skin. It is essential to understand the properties of and structures formed in a system combining microemulsion components and a gelator. This PhD thesis by Michaela Laupheimer provides an in-depth discussion of the phase behavior and sol-gel transition of a microemulsion gelled by a low molecular weight gelator as well as the rheological behavior of a gelled bicontinuous microemulsion. Moreover, the microstructure of the gelled bicontinuous system is fully clarified using techniques like self-diffusion NMR and small angle neutron scattering (SANS). By comparing gelled bicontinuous microemulsions with corresponding non-gelled microemulsions and binary gels, it is demonstrated that bicontinuous microemulsion domains coexist with a gelator network and that the coexisting structures possess no fundamental mutual influence. Hence, gelled bicontinuous microemulsions have been identified as a new type of orthogonal self-assembled system.

Michaela Laupheimer studied chemistry at the University of Stuttgart, Germany, with a focus on technical and physical chemistry. From August 2008 to January 2009 she did an internship at the Robert Bosch LLC Research and Technology Center in Palo Alto, USA, after which she finished her studies and received her diploma in March 2010. Working at the Institute of Physical Chemistry of the University of Stuttgart in the group of Prof. Dr. Cosima Stubenrauch she then studied gelled bicontinuous microemulsions for her PhD thesis, which she defended successfully in November 2013.