@article{NoteKoetzKosmella2006, author = {Note, Carine and Koetz, Joachim and Kosmella, Sabine}, title = {Structural changes in poly(ethyleneimine) modified microemulsion}, series = {Journal of colloid and interface science}, volume = {302}, journal = {Journal of colloid and interface science}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0021-9797}, doi = {10.1016/j.jcis.2006.06.071}, pages = {662 -- 668}, year = {2006}, abstract = {The influence of branched poly(ethyleneimine) on the phase behavior of the system sodium dodecylsulfate/toluene-pentanol (1:1)/water has been studied. The isotropic microemulsions still exist when water is replaced with aqueous solutions of PEI (up to 30\% in weight), but their stability is significantly influenced. From a polymer concentration of 20 wt\%, the polymer enhances the solubilization of water in oil, changes the sign of the spontaneous curvature of the surfactant film, and induces an inversion of the microemulsion type from water-in-oil (L-2) to oil-in-water (L-1), by the formation of a bicontinuous channel. Further investigations show that the addition of polymer in the L-2 phase changes the droplet-droplet interactions as the conductivity drops and the percolation disappears. In the bicontinuous channel, higher viscosities can be detected, as well as a weak percolation followed by a steep increase of the conductivity, which can be related to evident structural changes in the system. DSC measurements allow then to follow the changes of the water properties in the system, from interfacial-water in the L-2 phase to free-water in the sponge-like phase. Finally, all the measurements performed permit to characterize the structural transitions in the system and to understand the role of the added polymer.}, language = {en} } @article{RajuKosmellaFribergetal.2017, author = {Raju, Rajarshi Roy and Kosmella, Sabine and Friberg, Stig E. and Koetz, Joachim}, title = {Pickering Janus emulsions and polyelectrolyte complex-stabilized Janus gels}, series = {Colloids and surfaces : an international journal devoted to the principles and applications of colloid and interface science ; A, Physicochemical and engineering aspects}, volume = {533}, 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.2017.08.022}, pages = {241 -- 248}, year = {2017}, abstract = {Janus emulsions, containing olive oil (OO) and silicone oil (SiO), were formed in presence of polyelectrolyte complex particles, i.e., gelatin-sodium polyacrylate (NaPAA) complexes. The diameter of completely engulfed Janus droplets can be tuned between 50 and 200 mu m by varying the gelatin/NaPAA complex particle size between 200 and 400 nm. The gelatin/NaPAA complex particles adsorbed at the olive oil interface decrease the interfacial tension and stabilize the resulting completely engulfed Pickering Janus emulsions. Long-term stable Janus gels can be synthesized in presence of gelatin/sodium carboxymethylcellulose (NaCMC) mixtures. In that case Coulombic forces are of relevance with regard to the stabilization of the Janus droplets embedded in a gelatin/NaCMC gel matrix. Janus gels show elastic reological behavior and thixotropic properties.}, language = {en} } @book{KoetzKosmella2007, author = {Koetz, Joachim and Kosmella, Sabine}, title = {Polyelectrolytes and nanoparticles}, series = {Springer laboratory manuals in polymer science}, journal = {Springer laboratory manuals in polymer science}, publisher = {Springer-Verlag}, address = {Heidelberg}, isbn = {3-540-46381-X}, pages = {105 S.}, year = {2007}, 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{KoetzKosmellaKulickeetal.2002, author = {Koetz, Joachim and Kosmella, Sabine and Kulicke, Werner-Michael and Heinze, Thomas}, title = {Zum Einfluss des L{\"o}sungszustandes von Carboxymethylcellulosen auf das Strukturbildungsverhalten in kolloidalen Systemen}, year = {2002}, language = {de} } @article{KoetzKosmella2002, author = {Koetz, Joachim and Kosmella, Sabine}, title = {Interactions of Polyelectrolytes with Clay Surfaces}, isbn = {0-8247-0633-1}, year = {2002}, language = {en} } @article{KosmellaKlemkeHaeusleretal.2019, author = {Kosmella, Sabine and Klemke, Bastian and H{\"a}usler, Ines and Koetz, Joachim}, title = {From gel-like Pickering emulsions to highly ordered superparamagnetic magnetite aggregates with embedded gold nanoparticles}, series = {Colloids and surfaces : an international journal devoted to the principles and applications of colloid and interface science ; A, Physicochemical and engineering aspects}, volume = {570}, 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 Science}, address = {Amsterdam}, issn = {0927-7757}, doi = {10.1016/j.colsurfa.2019.03.017}, pages = {331 -- 338}, year = {2019}, abstract = {Pickering emulsions with two types of nanoparticles, i.e., superparamagnetic magnetite nanoparticles dispersed in n-hexane and gold nanoparticles dispersed in water, were formed by rigorous mixing in presence of surface active polymeric surfactants. Monodisperse magnetite nanoparticles with a mean particle size of 4 nm were obtained by a microwave-assisted synthesis in n-hexane in presence of oleic acid, and gold nanoparticles were produced in aqueous solution in presence of the hyperbranched poly(ethyleneimine) (PEI) or sodium citrate as reducing and stabilizing agent. After mixing the prepared nanoparticle dispersions in presence of the Pluronics an intermediate gel-like phase is formed. The Pickering emulsion droplets in the intermediate phase are stabilized by both types of nanoparticles, as to be seen by cryo-SEM micrographs. After separating, solvent evaporation and redispersion in water highly ordered Pluronic-stabilized superparamagnetic magnetite nanoparticle aggregates with embedded gold nanoparticles can be obtained.}, language = {en} } @article{RumschoettelBausKosmellaetal.2017, author = {Rumsch{\"o}ttel, Jens and Baus, Susann and Kosmella, Sabine and Appelhans, Dietmar and Koetz, Joachim}, title = {Incorporation of DNA/PEI polyplexes into gelatin/chitosan hydrogel scaffolds}, series = {Composite interfaces}, volume = {25}, journal = {Composite interfaces}, number = {1}, publisher = {Routledge, Taylor \& Francis Group}, address = {Abingdon}, issn = {1568-5543}, doi = {10.1080/09276440.2017.1302725}, pages = {1 -- 11}, year = {2017}, abstract = {Polyplexes between a double-stranded Salmon DNA and hyperbranched poly(ethyleneimine) (PEI) as well as a maltosylated PEI-Mal were incorporated into a gelatin/chitosan hydrogel scaffold. Calorimetric experiments of the polyplexes show a decrease of the melting temperature in presence of PEI and a peak splitting in presence of PEI-Mal, which can be interpreted to a partial compaction of the DNA strands in presence of PEI-Mal. When the polyplexes are incorporated into a gelatin/chitosan scaffold in the swollen state, the DNA melting peaks at 90 and 93 degrees C, respectively, indicate in both cases the release of the DNA at the surface of the hydrogel scaffold in a more compact form. Specific interactions between the PEI-Mal shell and gelatin are responsible for the tuning of the release properties in presence of the maltose units in the hyperbranched PEI.}, language = {en} } @article{RojasKoetzKosmellaetal.2009, author = {Rojas, Oscar and Koetz, Joachim and Kosmella, Sabine and Tiersch, Brigitte and Wacker, Philipp and Kramer, Markus}, title = {Structural studies of ionic liquid-modified microemulsions}, issn = {0021-9797}, doi = {10.1016/j.jcis.2009.02.039}, year = {2009}, abstract = {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.}, 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} }