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IRTG / Soft Matter Science
Freiburger Materialforschungszentrum
Stefan-Meier-Str. 21
79104 Freiburg, Germany

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You are here: Home Events Prof. Otto Glatter "Hierarchically Organized Nanostructured Materials – an Example of Applied Soft Matter Science "

Prof. Otto Glatter "Hierarchically Organized Nanostructured Materials – an Example of Applied Soft Matter Science "

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Department of Chemistry, University of Graz, Austria

What
  • Seminar
When Feb 08, 2012
from 02:15 PM to 03:00 PM
Where Hörsaal Makromolekulare Chemie, Stefan-Meier-Str. 31, Freiburg
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Glycerolmonolinolein (MLO), Glycerolmonoolein (GMO), Phytantriol (PT) self-assemble in bulk in presence of water to form well defined liquid crystalline phases. Their structure can be tuned by temperature variation and/or by addition of oils. This leads to gel-like or fluid systems with a large internal interface between water and oil domains with different viscosities. These nanostructured phases can be dispersed in the excess water phase by addition of an external stabilizer and energy input leading to internally self-assembled particles, so-called ISAsomes [1-6]. These ISAsomes are potential carrier systems for hydrophilic, amphiphilic and lipophilic functional molecules. Interestingly, similar structures are also formed in the intestine during digestion of fat [7].

The hierarchical structure can be extended to a next level by gellifying the continuous aqueous phase by the addition of polymers like κ-Carrageenan or Methylcellulose. This leads to a new type of hydrogel, loaded with ISAsomes [8-9]. These gels can even be dried into foils and re-dispersed on demand [10]. Finally, we can use the oil-continuous bulk phase to create concentrated, stable water-in-oil emulsions having a paste-like consistency with a water content of up to 90% by volume. These dense emulsions, also call bi-liquid foams do not need the addition of a stabilizer [11]. 

All these systems have a great potential as delivery systems for functional molecules in very different fields like pharmaceutical and cosmetic applications, food science and agro-chemistry. For structural characterization we use small-angle X-ray scattering, static and dynamic light scattering, microscopy and rheology.
 

[1] L. de Campo, et al., 2004 Langmuir 20, 5254.
[2] A. Yaghmur, et al., 2005 Langmuir 21, 569.
[3] A. Yaghmur, et al., 2006 Langmuir 22, 517.
[4] A. Salonen, et al., 2008 Langmuir 24, 5306.
[5] Ch. Moitzi, et al., 2007 Adv. Materials 19,  1352.
[6] F. Muller, et al., 2010 J. Colloid and Interface Sci. 342, 392.
[7] S. Salentinig et al. 2011 Soft Matter 7, 650.
[8] S. Guillot, et al., 2009 J. Colloid and Interface Sci. 330, 175.
[9] M. Tomšič, et al., 2009 Langmuir, 25, 9525.
[10] Ch. Kulkarni et al., 2011 Langmuir. 27 9541.
[11] Ch. Kulkarni et al., 2010 Soft Matter 6, 5615.

 

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