TY  - JOUR
A1  - Rojas, Oscar
A1  - Koetz, Joachim
A1  - Kosmella, Sabine
A1  - Tiersch, Brigitte
A1  - Wacker, Philipp
A1  - Kramer, Markus
T1  - Structural studies of ionic liquid-modified microemulsions
N2  - This work is focused on the influence of an ionic liquid (IL), i.e. ethyl-methylimidazolium hexylsulfate, on the spontaneous formation of microemulsions with ionic surfactants. The influence of the ionic liquid on Structure formation in the optically clear phase region in water/toluene/pentanol mixtures in presence of the cationic surfactant CTAB was studied in more detail. The results show a significant increase of the transparent phase region by adding the ionic liquid. Conductometric investigations demonstrate that adding the ionic liquid can drastically reduce the droplet- droplet interactions in the L-2 phase. H-1 nuclear magnetic resonance (H-1 NMR) diffusion coefficient measurements in combination with dynamic light scattering measurements clearly show that inverse microemulsion droplets still exist, but the droplet size is decreased to 2 nm. A more detailed characterisation of the isotropic phase channel by means of conductivity measurements, dynamic light scattering (DLS), H-1 NMR and cryo-scanning electron microscopy (SEM), allows the identification of a bicontinuous sponge phase between the L-1 and L-2 phase. When the poly(ethyleneimine) is added, the isotropic phase range is reduced drastically, but the inverse microemulsion range still exists.
Y1  - 2009
UR  - http://www.sciencedirect.com/science/journal/00219797
U6  - https://doi.org/10.1016/j.jcis.2009.02.039
SN  - 0021-9797
ER  - 
TY  - JOUR
A1  - Lutter, Stefanie
A1  - Koetz, Joachim
A1  - Tiersch, Brigitte
A1  - Kosmella, Sabine
T1  - Polymer-modified bicontinuous microemulsions used as a template for the formation of nanorods
N2  - This article is focused on the characterization of the poly(ethylene glycol) (PEG)-induced bicontinuous microemulsion of the pseudo-ternary system sodium dodecylsulfate (SDS)/xylene-pentanol/water by means of differential scanning calorimetry, rheology, and conductometry. The influence of the polymer concentration (cp) and the molecular weight (Mw) on the microstructure of the microemulsion was investigated using Cryo scanning electron microscopy. It was found that an increase of cp influences the structure of the sponge-like phase significantly. These polymer-modified microemulsions can be used as a template phase for the formation of BaSO4 nanorods, where individual nanoparticles (5nm in size) are ordered along the polymer backbone.
Y1  - 2009
UR  - http://www.informaworld.com/openurl?genre=journal&issn=0193-2691
U6  - https://doi.org/10.1080/01932690802643113
SN  - 0193-2691
ER  -