@article{KosmellaKoetzFribergetal.1996,
  author    = {Kosmella, Sabine and Koetz, Joachim and Friberg, Stig E. and Mackay, R. A},
  title     = {Interactions of polyelectrolytes with the lyotropic liquid crystalline system Na-dodecylsulfate / decanol / water},
  year      = {1996},
  language  = {en}
}
@article{KosmellaKoetzFribergetal.1996,
  author    = {Kosmella, Sabine and Koetz, Joachim and Friberg, Stig E. and Mackay, R. A.},
  title     = {Interactions of polyelectrolytes with the lyotropic liquid crystalline system - hexadecyltrimethylammonium bromide / decanol / water},
  issn      = {0927-7757},
  year      = {1996},
  language  = {en}
}
@article{RuppeltKoetzJaegeretal.1997,
  author    = {Ruppelt, Dirk and Koetz, Joachim and Jaeger, Werner and Friberg, Stig E. and Mackay, R. A.},
  title     = {The influence of cationic polyelectrolytes on structure formation in lamellar liquid crystalline systems},
  year      = {1997},
  language  = {en}
}
@article{BechtholdTierschKoetzetal.1999,
  author    = {Bechthold, Nina and Tiersch, Brigitte and Koetz, Joachim and Friberg, Stig E.},
  title     = {Structure Formation in polymer-modified liquid crystals},
  year      = {1999},
  language  = {en}
}
@article{BeitzKoetzFriberg1999,
  author    = {Beitz, Toralf and Koetz, Joachim and Friberg, Stig E.},
  title     = {Polymer-modified ionic microemulsion formed in the system SDS/Water/Xylene/Pentanol},
  year      = {1999},
  language  = {en}
}
@article{BeyermannKoetzJaegeretal.1999,
  author    = {Beyermann, Jochen and Koetz, Joachim and J{\"a}ger, Werner and Friberg, Stig E.},
  title     = {Influence of charge density of anionic polyelectrolytes on structure formation in liquid crystalline systems},
  year      = {1999},
  language  = {en}
}
@article{BeitzKoetzWolfetal.2001,
  author    = {Beitz, Toralf and Koetz, Joachim and Wolf, Gunter and Kleinpeter, Erich and Friberg, Stig E.},
  title     = {Poly(N-vinyl-2-pyrrolidone) and 1-octyl-2-pyrrolidinone modified ionic microemulsions},
  year      = {2001},
  language  = {en}
}
@article{FribergKovachKoetz2013,
  author    = {Friberg, Stig E. and Kovach, Ildiko and Koetz, Joachim},
  title     = {Equilibrium topology and partial inversion of Janus Drops - a numerical analysis},
  series = {ChemPhysChem : a European journal of chemical physics and physical chemistry},
  volume    = {14},
  journal   = {ChemPhysChem : a European journal of chemical physics and physical chemistry},
  number    = {16},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1439-4235},
  doi       = {10.1002/cphc.201300635},
  pages     = {3772 -- 3776},
  year      = {2013},
  abstract  = {The equilibrium topology of an aqueous Janus emulsion of two oils, O1 and O2, with water, W, [(O1+O2)/W], is numerically evaluated with the following realistic interfacial tensions (): (O2/W)=5 mNm(-1), (O1/O2)=1 mNm(-1), and (O1/W) varies within the range 4-5 mNm(-1), which is the limiting range for stable Janus drop topology. The relative significance of the two independently pivotal factors for the topology is evaluated, that is, the local equilibrium at the line of contact between the three liquids and the volume fraction of the two dispersed liquids within the drop. The results reveal a dominant effect of the local equilibrium on the fraction of the O2 drop surface that is covered by O1. In contrast, for a constant volume of O2, the impact of the interfacial tension balance on the limit of the coverage is modest for an infinite volume of O1. Interestingly, when the O1 volume exceeds this value, an emulsion inversion occurs, and the O1 portion of the (O1+O2)/W topology becomes a continuous phase, generating a (W+O2)/O1 Janus configuration.},
  language  = {en}
}
@article{KovachKoetzFriberg2014,
  author    = {Kovach, Ildyko and Koetz, Joachim and Friberg, Stig E.},
  title     = {Janus emulsions stabilized by phospholipids},
  series = {Colloids and surfaces : an international journal devoted to the principles and applications of colloid and interface science ; A, Physicochemical and engineering aspects},
  volume    = {441},
  journal   = {Colloids and surfaces : an international journal devoted to the principles and applications of colloid and interface science ; A, Physicochemical and engineering aspects},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0927-7757},
  doi       = {10.1016/j.colsurfa.2013.08.065},
  pages     = {66 -- 71},
  year      = {2014},
  abstract  = {Janus emulsions were formed by mixing three immiscible liquids; this implies two oil components (i.e. olive oil (00) and silicone oil (SiO)) with water in presence of interfacial active components. The morphology and size of Janus droplets formed strongly depended on the type of surfactant used. In presence of a non-ionic surfactant, i.e. Tween 80, large engulfed Janus droplets were formed. By adding phospholipids to the system the droplet size was decreased and more stable Janus droplets formed. Interfacial tension measurements carried out using a spinning drop apparatus and a ring tensiometer demonstrate that interfacial tension is the most important factor controlling the size, morphology and stability of Janus droplets. When the interfacial tension between oil and water becomes <= 1 mN/m, smaller Janus droplets are formed. Such conditions are fulfilled when phospholipids are used in combination with non-ionic surfactant Tween 80. The morphology of the double droplets is predominantly controlled by the viscosity and interfacial tension between the two oil phases. By using different types of phospholipids, i.e. asolectin and lecithin instead of a more concentrated phosphatidylcholine (phospholipon), the interfacial tension is decreased and different morphologies of engulfing can be observed.},
  language  = {en}
}
@article{HasinovicBoggsFribergetal.2014,
  author    = {Hasinovic, Hida and Boggs, Cami and Friberg, Stig E. and Kovach, Ildiko and Koetz, Joachim},
  title     = {Janus emulsions from a one-step process; optical microscopy images},
  series = {Journal of dispersion science and technology},
  volume    = {35},
  journal   = {Journal of dispersion science and technology},
  number    = {5},
  publisher = {Taylor \& Francis Group},
  address   = {Philadelphia},
  issn      = {0193-2691},
  doi       = {10.1080/01932691.2013.801019},
  pages     = {613 -- 618},
  year      = {2014},
  abstract  = {The optical microscopy images of an emulsion are commonly distorted when viewed between a cover glass and a planar microscopy slide. An alternative method is to place the sample on a slide with a cavity, which in turn suffers from incomplete information for high internal phase ratio (HIPR) emulsions, due to the inevitable crowding of the drops. This problem is particularly acute for more complex emulsions, such as those with Janus drops, for which a detailed image of the drop is essential. A number of publications have recently described Janus emulsions prepared by a one-step high energy emulsification process with microscopy images obtained by the sample between a planar slide and a cover glass. The correlation to the morphology of emulsions in bulk of these images is critical, but, so far, a potential equivalence has not been established. Since the images are central in order to understand why Janus emulsions should form under such conditions, the need to ascertain any such association is urgent. With this contribution, we compare images from different microscopy methods to those of gently diluted HIPR emulsions. The results reveal that the images of the emulsion samples between a cover glass and a planar microscope slide actually present a realistic representation of the drop topology in bulk emulsions.},
  language  = {en}
}