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Main Title: Formation and structure of slightly anionically charged nanoemulsions obtained by the phase inversion concentration (PIC) method
Author(s): Heunemann, Peggy
Prévost, Sylvain
Grillo, Isabelle
Marino, Christina Michelina
Meyer, Jürgen
Gradzielski, Michael
Type: Article
Language Code: en
Abstract: While nanoemulsions (10–200 nm) are not thermodynamically stable systems they can exhibit quite long term stability. In this paper oil/surfactant mixtures, containing diethylhexyl carbonate/phenoxyethanol/parabens as oil and polyglyceryl-4 laurate/dilauryl citrate as surfactant, form nanoemulsions simply by dilution with water, i.e. by means of the phase inversion concentration (PIC) method. In order to study this highly interesting phenomenon an investigation at constant oil-to-surfactant (O/S) ratio was done by means of viscosity, conductivity, and UV/Vis-transmittance measurements. This phase study as a function of the dilution by water shows that at an intermediate water content a two-phase system of bicontinuous structure is formed, which exhibits a very pronounced viscosity and conductivity maximum shortly before the homogeneous nanoemulsion phase is reached. In the same region SANS shows a high degree of ordering of this bicontinuous structure. SANS and cryo-TEM investigations of the nanoemulsion regime show an increasing average size with dilution and, more interestingly, the presence of two populations with different average particle sizes around 10–15 nm and 25–40 nm. The relative proportion of each population depends on the amount of added water, leading to an average growth of the particle size with increasing dilution.
Issue Date: 2011
Date Available: 1-Jul-2016
DDC Class: 530 Physik
Journal Title: Soft matter
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 7
Issue: 12
Publisher DOI: 10.1039/c0sm01556c
Page Start: 5697
Page End: 5710
EISSN: 1744-6848
ISSN: 1744-683X
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Inst. Chemie » Publications

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