@article{KoetzBruehlKosmella1997,
  author    = {Koetz, Joachim and Br{\"u}hl, Iris and Kosmella, Sabine},
  title     = {Polyelektrolytkomplexbildung in lyotrop fl{\"u}ssigkristallinen Systemen},
  isbn      = {3-8265-2908-1},
  year      = {1997},
  language  = {de}
}
@article{KoetzBeitzKosmellaetal.2000,
  author    = {Koetz, Joachim and Beitz, Toralf and Kosmella, Sabine and Tiersch, Brigitte},
  title     = {Polymer-modified microemulsions},
  year      = {2000},
  language  = {en}
}
@article{KoetzBahnemannLucasetal.2004,
  author    = {Koetz, Joachim and Bahnemann, Jennifa and Lucas, Gordon and Tiersch, Brigitte and Kosmella, Sabine},
  title     = {Polyelectrolyte-modified microemulsions as new templates for the formation of nanoparticles},
  issn      = {0927-7757},
  year      = {2004},
  abstract  = {The paper is focused on the formation and redispersion of monodisperse BaSO4 nanoparticles in polyelectrolyte- modified microemulsions. It is shown that a cationic polyelectrolyte of low molar mass, e.g. poly(dially1dimethylammonium chloride) (PDADMAC), can be incorporated into the individual inverse microemulsion droplets (L2 phase) consisting of heptanol, water, and an amphoteric surfactant with a sulfobetaine head group. These PDADMAC- filled microemulsion droplets can be successfully used as a template phase for the nanoparticle formation. The monodisperse BaSO4 nanoparticles are produced by a simple mixing procedure and can be redispersed after solvent evaporation without a change in particle dimensions. Dynamic and electrophoretical light scattering in combination with sedimentation experiments in the analytical Ultracentrifuge of the redispersed powder show polyelectrolyte-stabilized nanoparticles with diameters of about 6 nm. The polyelectrolyte shows a "size control effect", which can be explained by the polyelectrolyte-surfactant interactions in relation to the polyelectrolyte-nanoparticle interactions during the particle growth, solvent evaporation and redispersion process. However, the approach used here opens away to produce different types of polyelectrolyte-stabilized nanoparticles (including rare metals, semiconductors, carbonates or oxides) of very small dimensions. (C) 2004 Elsevier B.V. All rights reserved},
  language  = {en}
}
@article{KoetzBahnemannKosmella2004,
  author    = {Koetz, Joachim and Bahnemann, Jennifa and Kosmella, Sabine},
  title     = {The influence of a cationic polyelectrolyte on the inverse micellar region of the ternary system sulfobetaine/ water/alcohol},
  issn      = {0887-624X -},
  year      = {2004},
  language  = {en}
}
@article{KoetzAndresKosmellaetal.2006,
  author    = {Koetz, Joachim and Andres, S. and Kosmella, Sabine and Tiersch, Brigitte},
  title     = {BaSO4 nanorods produced in polymer-modified bicontinuous microemulsions},
  issn      = {0927-6440},
  doi       = {10.1163/156855406777408629},
  year      = {2006},
  abstract  = {The influence of the water soluble polymer poly(ethylene glycol) (PEG) on structure formation in the quasiternary system sodium dodecylsulfate (SDS)/pentanol-xylene/water was checked by means of conductometry, rheology, and micro differential calorimetry. The polymer induces the formation of an isotropic phase channel between the o/w and w/o microemulsion. The transition from the normal as well as from the inverse micellar to the bicontinuous phase range can be detected by conductometry, rheology as well as micro-DSC. As a result of polymer-surfactant interactions, the spontaneous curvature of the surfactant film is changed and a sponge phase is formed. The bicontinuous phase is characterized by a moderate shear viscosity, a Newtonian flow behaviour, and the disappearence of interphasal water in the heating curve of the micro-DSC. When the polymer-modified bicontinuous phase is used as a template phase for the nanoparticle formation, spherical BaSO4 nanoparticles were formed. During the following solvent evaporation process the primarily formed spherical nanoparticles aggregate to nanorods and triangular structures due to the non-restriction of the bicontinuous template phase in longitudinal direction},
  language  = {en}
}
@article{FechnerKosmellaKoetz2010,
  author    = {Fechner, Mabya and Kosmella, Sabine and Koetz, Joachim},
  title     = {pH-dependent polyampholyte SDS interactions},
  issn      = {0021-9797},
  doi       = {10.1016/j.jcis.2010.01.092},
  year      = {2010},
  abstract  = {Aqueous solutions of sodium dodecylsulfate (SDS) and poly(N,N'-diallyl-N,N'-dimethyl-alt-maleamic carboxylate) (PalH), a synthetic pH-tuneable polyelectrolyte (PEL), have been investigated by various techniques at different pH-values in absence and presence of NaCl. Potentiometric measurements using a surfactant-selective electrode indicate a quite complex interaction mechanism, which can be subdivided into different regions, where non-cooperative, electrostatic and cooperative hydrophobic interactions are of relevance. It was concluded, that in dependence on pH, conformational changes are responsible for the different interaction behavior in the NaCl-free system. Isothermal titration calorimetry (ITC) suggests that early stage hydrophobic binding is an exothermic process followed by electrostatic interactions, which are endothermic in nature and entropy driven. After NaCl addition the interaction mechanism becomes independent of pH due to a screening of (i) attractive interactions between the surfactant head groups and oppositely charged binding sites and (ii) repulsive forces between the surfactant head groups. Furthermore, the ITC investigations have revealed that after salt-addition surfactant micelles interact with the polymer instead of separated SDS molecules due to a depression of the CMC.},
  language  = {en}
}
@article{DolyaRojasKosmellaetal.2013,
  author    = {Dolya, Natalya and Rojas, Oscar and Kosmella, Sabine and Tiersch, Brigitte and Koetz, Joachim and Kudaibergenov, Sarkyt},
  title     = {"One-Pot" in situ frmation of Gold Nanoparticles within Poly(acrylamide) Hydrogels},
  series = {Macromolecular chemistry and physics},
  volume    = {214},
  journal   = {Macromolecular chemistry and physics},
  number    = {10},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1022-1352},
  doi       = {10.1002/macp.201200727},
  pages     = {1114 -- 1121},
  year      = {2013},
  abstract  = {This paper focuses on two different strategies to incorporate gold nanoparticles (AuNPs) into the matrix of polyacrylamide (PAAm) hydrogels. Poly(ethyleneimine) (PEI) is used as both reducing and stabilizing agent for the formation of AuNPs. In addition, the influence of an ionic liquid (IL) (i.e., 1-ethyl-3-methylimidazolium ethylsulfate) on the stability of the nanoparticles and their immobilization in the hydrogel is investigated The results show that AuNPs surrounded by a shell containing PEI and IL, synthesized according to the one-pot approach, are much better immobilized within the PAAm hydrogel. Hereby, the IL is responsible for structural changes in the hydrogel as well as the improved stabilization and embedding of the AuNPs into the polymer gel matrix.},
  language  = {en}
}
@article{BeisebekovSerikpayevaZhumagalievaetal.2015,
  author    = {Beisebekov, Madiar Maratovich and Serikpayeva, Saniya B. and Zhumagalieva, Shynar Nurlanovna and Beisebekov, Marat Kianovich and Abilov, Zharylkasyn Abduachitovich and Kosmella, Sabine and Koetz, Joachim},
  title     = {Interactions of bentonite clay in composite gels of non-ionic polymers with cationic surfactants and heavy metal ions},
  series = {Colloid and polymer science : official journal of the Kolloid-Gesellschaft},
  volume    = {293},
  journal   = {Colloid and polymer science : official journal of the Kolloid-Gesellschaft},
  number    = {2},
  publisher = {Springer},
  address   = {New York},
  issn      = {0303-402X},
  doi       = {10.1007/s00396-014-3463-x},
  pages     = {633 -- 639},
  year      = {2015},
  abstract  = {Chemically cross-linked composite gels based on bentonite clay from Manyrak deposit (Kazakhstan Republic) and nonionic polymers, i.e., poly(hydroxyethylacrylate) and poly(acrylamide), were polymerized in situ after preliminary intercalation of monomers in an aqueous suspension of bentonite clay. By means of cryo-scanning electron microscopy, it was shown that bentonite clay is well incorporated into the gel network structure with pore sizes up to 1.5 mu m. The intercalated bentonite clay can adsorb cationic surfactants as well as heavy metal ions due to electrostatic interactions. Conductometric and surface tension measurements indicate not only the adsorption of surfactants and heavy metals inside the hydrogel, but also the displacement of the critical micellization concentration (CMC) of the surfactants.},
  language  = {en}
}